aboutsummaryrefslogtreecommitdiffstats
path: root/src/quick/items/qquickwindow.cpp
blob: a0a07f43cc3e4a57e65c141abbbaa26ccc816d7a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
3961
3962
3963
3964
3965
3966
3967
3968
3969
3970
3971
3972
3973
3974
3975
3976
3977
3978
3979
3980
3981
3982
3983
3984
3985
3986
3987
3988
3989
3990
3991
3992
3993
3994
3995
3996
3997
3998
3999
4000
4001
4002
4003
4004
4005
4006
4007
4008
4009
4010
4011
4012
4013
4014
4015
4016
4017
4018
4019
4020
4021
4022
4023
4024
4025
4026
4027
4028
4029
4030
4031
4032
4033
4034
4035
4036
4037
4038
4039
4040
4041
4042
4043
4044
4045
4046
4047
4048
4049
4050
4051
4052
4053
4054
4055
4056
4057
4058
4059
4060
4061
4062
4063
4064
4065
4066
4067
4068
4069
4070
4071
4072
4073
4074
4075
4076
4077
4078
4079
4080
4081
4082
4083
4084
4085
4086
4087
4088
4089
4090
4091
4092
4093
4094
4095
4096
4097
4098
4099
4100
4101
4102
4103
4104
4105
4106
4107
4108
4109
4110
4111
4112
4113
4114
4115
4116
4117
4118
4119
4120
4121
4122
4123
4124
4125
4126
4127
4128
4129
4130
4131
4132
4133
4134
4135
4136
4137
4138
4139
4140
4141
4142
4143
4144
4145
4146
4147
4148
4149
4150
4151
4152
4153
4154
4155
4156
4157
4158
4159
4160
4161
4162
4163
4164
4165
4166
4167
4168
4169
4170
4171
4172
4173
4174
4175
4176
4177
4178
4179
4180
4181
4182
4183
4184
4185
4186
4187
4188
4189
4190
4191
4192
4193
4194
4195
4196
4197
4198
4199
4200
4201
4202
4203
4204
4205
4206
4207
4208
4209
4210
4211
4212
4213
4214
4215
4216
4217
4218
4219
4220
4221
4222
4223
4224
4225
4226
4227
4228
4229
4230
4231
4232
4233
4234
4235
4236
4237
4238
4239
4240
4241
4242
4243
4244
4245
4246
4247
4248
4249
4250
4251
4252
4253
4254
4255
4256
4257
4258
4259
4260
4261
4262
4263
4264
4265
4266
4267
4268
4269
4270
4271
4272
4273
4274
4275
4276
4277
4278
4279
4280
4281
4282
4283
4284
4285
4286
4287
4288
4289
4290
4291
4292
4293
4294
4295
4296
4297
4298
4299
4300
4301
4302
4303
4304
4305
4306
4307
4308
4309
4310
4311
4312
4313
4314
4315
4316
4317
4318
4319
4320
4321
4322
4323
4324
4325
4326
4327
4328
4329
4330
4331
4332
4333
4334
4335
4336
4337
4338
4339
4340
4341
4342
4343
4344
4345
4346
4347
4348
4349
4350
4351
4352
4353
4354
4355
4356
4357
4358
4359
4360
4361
4362
4363
4364
4365
4366
4367
4368
4369
4370
4371
4372
4373
4374
4375
4376
4377
4378
4379
4380
4381
4382
4383
4384
4385
4386
4387
4388
4389
4390
4391
4392
4393
4394
4395
4396
4397
4398
4399
4400
4401
4402
4403
4404
4405
4406
4407
4408
4409
4410
4411
4412
4413
4414
4415
4416
4417
4418
4419
4420
4421
4422
4423
4424
4425
4426
4427
4428
4429
4430
4431
4432
4433
4434
4435
4436
4437
4438
4439
4440
4441
4442
4443
4444
4445
4446
4447
4448
4449
4450
4451
4452
4453
4454
4455
4456
4457
4458
4459
4460
4461
4462
4463
4464
4465
4466
4467
4468
4469
4470
4471
4472
4473
4474
4475
4476
4477
4478
4479
4480
4481
4482
4483
4484
4485
4486
4487
4488
4489
4490
4491
4492
4493
4494
4495
4496
4497
4498
4499
4500
4501
4502
4503
4504
4505
4506
4507
4508
4509
4510
4511
4512
4513
4514
4515
4516
4517
4518
4519
4520
4521
4522
4523
4524
4525
4526
4527
4528
4529
4530
4531
4532
4533
4534
4535
4536
4537
4538
4539
4540
4541
4542
4543
4544
4545
4546
4547
4548
4549
4550
4551
4552
4553
4554
4555
4556
4557
4558
4559
4560
/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtQuick module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qquickwindow.h"
#include "qquickwindow_p.h"
#include "qquickwindowattached_p.h"

#include "qquickitem.h"
#include "qquickitem_p.h"
#include "qquickevents_p_p.h"

#include <private/qquickdrag_p.h>

#include <QtQuick/private/qsgrenderer_p.h>
#include <QtQuick/private/qsgtexture_p.h>
#include <private/qsgrenderloop_p.h>
#include <private/qquickrendercontrol_p.h>
#include <private/qquickanimatorcontroller_p.h>
#include <private/qquickprofiler_p.h>

#include <private/qguiapplication_p.h>
#include <QtGui/QInputMethod>

#include <private/qabstractanimation_p.h>

#include <QtGui/qpainter.h>
#include <QtGui/qevent.h>
#include <QtGui/qmatrix4x4.h>
#include <QtGui/qstylehints.h>
#include <QtCore/qvarlengtharray.h>
#include <QtCore/qabstractanimation.h>
#include <QtCore/QLibraryInfo>
#include <QtCore/QRunnable>
#include <QtQml/qqmlincubator.h>

#include <QtQuick/private/qquickpixmapcache_p.h>

#include <private/qqmlmemoryprofiler_p.h>
#include <private/qqmldebugserviceinterfaces_p.h>
#include <private/qqmldebugconnector_p.h>
#ifndef QT_NO_OPENGL
# include <private/qopenglvertexarrayobject_p.h>
# include <private/qsgdefaultrendercontext_p.h>
#endif

QT_BEGIN_NAMESPACE

Q_LOGGING_CATEGORY(DBG_TOUCH, "qt.quick.touch")
Q_LOGGING_CATEGORY(DBG_TOUCH_TARGET, "qt.quick.touch.target")
Q_LOGGING_CATEGORY(DBG_MOUSE, "qt.quick.mouse")
Q_LOGGING_CATEGORY(DBG_MOUSE_TARGET, "qt.quick.mouse.target")
Q_LOGGING_CATEGORY(DBG_HOVER_TRACE, "qt.quick.hover.trace")
Q_LOGGING_CATEGORY(DBG_FOCUS, "qt.quick.focus")
Q_LOGGING_CATEGORY(DBG_DIRTY, "qt.quick.dirty")

extern Q_GUI_EXPORT QImage qt_gl_read_framebuffer(const QSize &size, bool alpha_format, bool include_alpha);

bool QQuickWindowPrivate::defaultAlphaBuffer = false;

void QQuickWindowPrivate::updateFocusItemTransform()
{
#ifndef QT_NO_IM
    Q_Q(QQuickWindow);
    QQuickItem *focus = q->activeFocusItem();
    if (focus && QGuiApplication::focusObject() == focus) {
        QQuickItemPrivate *focusPrivate = QQuickItemPrivate::get(focus);
        QGuiApplication::inputMethod()->setInputItemTransform(focusPrivate->itemToWindowTransform());
        QGuiApplication::inputMethod()->setInputItemRectangle(QRectF(0, 0, focusPrivate->width, focusPrivate->height));
        focus->updateInputMethod(Qt::ImInputItemClipRectangle);
    }
#endif
}

class QQuickWindowIncubationController : public QObject, public QQmlIncubationController
{
    Q_OBJECT

public:
    QQuickWindowIncubationController(QSGRenderLoop *loop)
        : m_renderLoop(loop), m_timer(0)
    {
        // Allow incubation for 1/3 of a frame.
        m_incubation_time = qMax(1, int(1000 / QGuiApplication::primaryScreen()->refreshRate()) / 3);

        QAnimationDriver *animationDriver = m_renderLoop->animationDriver();
        if (animationDriver) {
            connect(animationDriver, SIGNAL(stopped()), this, SLOT(animationStopped()));
            connect(m_renderLoop, SIGNAL(timeToIncubate()), this, SLOT(incubate()));
        }
    }

protected:
    void timerEvent(QTimerEvent *) Q_DECL_OVERRIDE
    {
        killTimer(m_timer);
        m_timer = 0;
        incubate();
    }

    void incubateAgain() {
        if (m_timer == 0) {
            // Wait for a while before processing the next batch. Using a
            // timer to avoid starvation of system events.
            m_timer = startTimer(m_incubation_time);
        }
    }

public slots:
    void incubate() {
        if (incubatingObjectCount()) {
            if (m_renderLoop->interleaveIncubation()) {
                incubateFor(m_incubation_time);
            } else {
                incubateFor(m_incubation_time * 2);
                if (incubatingObjectCount())
                    incubateAgain();
            }
        }
    }

    void animationStopped() { incubate(); }

protected:
    void incubatingObjectCountChanged(int count) Q_DECL_OVERRIDE
    {
        if (count && !m_renderLoop->interleaveIncubation())
            incubateAgain();
    }

private:
    QSGRenderLoop *m_renderLoop;
    int m_incubation_time;
    int m_timer;
};

#include "qquickwindow.moc"


#ifndef QT_NO_ACCESSIBILITY
/*!
    Returns an accessibility interface for this window, or 0 if such an
    interface cannot be created.
*/
QAccessibleInterface *QQuickWindow::accessibleRoot() const
{
    return QAccessible::queryAccessibleInterface(const_cast<QQuickWindow*>(this));
}
#endif


/*
Focus behavior
==============

Prior to being added to a valid window items can set and clear focus with no
effect.  Only once items are added to a window (by way of having a parent set that
already belongs to a window) do the focus rules apply.  Focus goes back to
having no effect if an item is removed from a window.

When an item is moved into a new focus scope (either being added to a window
for the first time, or having its parent changed), if the focus scope already has
a scope focused item that takes precedence over the item being added.  Otherwise,
the focus of the added tree is used.  In the case of a tree of items being
added to a window for the first time, which may have a conflicted focus state (two
or more items in one scope having focus set), the same rule is applied item by item -
thus the first item that has focus will get it (assuming the scope doesn't already
have a scope focused item), and the other items will have their focus cleared.
*/

QQuickRootItem::QQuickRootItem()
{
}

/*! \reimp */
void QQuickWindow::exposeEvent(QExposeEvent *)
{
    Q_D(QQuickWindow);
    if (d->windowManager)
        d->windowManager->exposureChanged(this);
}

/*! \reimp */
void QQuickWindow::resizeEvent(QResizeEvent *ev)
{
    Q_D(QQuickWindow);
    if (d->contentItem)
        d->contentItem->setSize(ev->size());
    if (d->windowManager)
        d->windowManager->resize(this);
}

/*! \reimp */
void QQuickWindow::showEvent(QShowEvent *)
{
    Q_D(QQuickWindow);
    if (d->windowManager)
        d->windowManager->show(this);
}

/*! \reimp */
void QQuickWindow::hideEvent(QHideEvent *)
{
    Q_D(QQuickWindow);
    if (d->windowManager)
        d->windowManager->hide(this);
}

/*! \reimp */
void QQuickWindow::focusOutEvent(QFocusEvent *ev)
{
    Q_D(QQuickWindow);
    d->contentItem->setFocus(false, ev->reason());
}

/*! \reimp */
void QQuickWindow::focusInEvent(QFocusEvent *ev)
{
    Q_D(QQuickWindow);
    d->contentItem->setFocus(true, ev->reason());
    d->updateFocusItemTransform();
}

#ifndef QT_NO_IM
static bool transformDirtyOnItemOrAncestor(const QQuickItem *item)
{
    while (item) {
        if (QQuickItemPrivate::get(item)->dirtyAttributes & (
            QQuickItemPrivate::TransformOrigin |
            QQuickItemPrivate::Transform |
            QQuickItemPrivate::BasicTransform |
            QQuickItemPrivate::Position |
            QQuickItemPrivate::Size |
            QQuickItemPrivate::ParentChanged |
            QQuickItemPrivate::Clip)) {
            return true;
        }
        item = item->parentItem();
    }
    return false;
}
#endif

void QQuickWindowPrivate::polishItems()
{
    // An item can trigger polish on another item, or itself for that matter,
    // during its updatePolish() call. Because of this, we cannot simply
    // iterate through the set, we must continue pulling items out until it
    // is empty.
    // In the case where polish is called from updatePolish() either directly
    // or indirectly, we use a recursionSafeguard to print a warning to
    // the user.
    int recursionSafeguard = INT_MAX;
    while (!itemsToPolish.isEmpty() && --recursionSafeguard > 0) {
        QQuickItem *item = itemsToPolish.takeLast();
        QQuickItemPrivate *itemPrivate = QQuickItemPrivate::get(item);
        itemPrivate->polishScheduled = false;
        itemPrivate->updatePolish();
        item->updatePolish();
    }

    if (recursionSafeguard == 0)
        qWarning("QQuickWindow: possible QQuickItem::polish() loop");

#ifndef QT_NO_IM
    if (QQuickItem *focusItem = q_func()->activeFocusItem()) {
        // If the current focus item, or any of its anchestors, has changed location
        // inside the window, we need inform IM about it. This to ensure that overlays
        // such as selection handles will be updated.
        const bool isActiveFocusItem = (focusItem == QGuiApplication::focusObject());
        const bool hasImEnabled = focusItem->inputMethodQuery(Qt::ImEnabled).toBool();
        if (isActiveFocusItem && hasImEnabled && transformDirtyOnItemOrAncestor(focusItem))
            updateFocusItemTransform();
    }
#endif
}

/*!
 * Schedules the window to render another frame.
 *
 * Calling QQuickWindow::update() differs from QQuickItem::update() in that
 * it always triggers a repaint, regardless of changes in the underlying
 * scene graph or not.
 */
void QQuickWindow::update()
{
    Q_D(QQuickWindow);
    if (d->windowManager)
        d->windowManager->update(this);
    else if (d->renderControl)
        QQuickRenderControlPrivate::get(d->renderControl)->update();
}

static void updatePixelRatioHelper(QQuickItem *item, float pixelRatio)
{
    if (item->flags() & QQuickItem::ItemHasContents) {
        QQuickItemPrivate *itemPrivate = QQuickItemPrivate::get(item);
        itemPrivate->itemChange(QQuickItem::ItemDevicePixelRatioHasChanged, pixelRatio);
    }

    QList <QQuickItem *> items = item->childItems();
    for (int i = 0; i < items.size(); ++i)
        updatePixelRatioHelper(items.at(i), pixelRatio);
}

void QQuickWindow::physicalDpiChanged()
{
    Q_D(QQuickWindow);
    const qreal newPixelRatio = screen()->devicePixelRatio();
    if (qFuzzyCompare(newPixelRatio, d->devicePixelRatio))
        return;
    d->devicePixelRatio = newPixelRatio;
    if (d->contentItem)
        updatePixelRatioHelper(d->contentItem, newPixelRatio);
}

void QQuickWindow::handleScreenChanged(QScreen *screen)
{
    Q_D(QQuickWindow);
    if (screen) {
        physicalDpiChanged();
        // When physical DPI changes on the same screen, either the resolution or the device pixel
        // ratio changed. We must check what it is. Device pixel ratio does not have its own
        // ...Changed() signal.
        d->physicalDpiChangedConnection = connect(screen, SIGNAL(physicalDotsPerInchChanged(qreal)),
                                                  this, SLOT(physicalDpiChanged()));
    } else {
        disconnect(d->physicalDpiChangedConnection);
    }

    d->forcePolish();
}

void forcePolishHelper(QQuickItem *item)
{
    if (item->flags() & QQuickItem::ItemHasContents) {
        item->polish();
    }

    QList <QQuickItem *> items = item->childItems();
    for (int i=0; i<items.size(); ++i)
        forcePolishHelper(items.at(i));
}

/*!
    Schedules polish events on all items in the scene.
*/
void QQuickWindowPrivate::forcePolish()
{
    Q_Q(QQuickWindow);
    if (!q->screen())
        return;
    forcePolishHelper(contentItem);
}

void forceUpdate(QQuickItem *item)
{
    if (item->flags() & QQuickItem::ItemHasContents)
        item->update();
    QQuickItemPrivate::get(item)->dirty(QQuickItemPrivate::ChildrenUpdateMask);

    QList <QQuickItem *> items = item->childItems();
    for (int i=0; i<items.size(); ++i)
        forceUpdate(items.at(i));
}

void QQuickWindowPrivate::syncSceneGraph()
{
    QML_MEMORY_SCOPE_STRING("SceneGraph");
    Q_Q(QQuickWindow);

    animationController->beforeNodeSync();

    emit q->beforeSynchronizing();
    runAndClearJobs(&beforeSynchronizingJobs);
    if (!renderer) {
        forceUpdate(contentItem);

        QSGRootNode *rootNode = new QSGRootNode;
        rootNode->appendChildNode(QQuickItemPrivate::get(contentItem)->itemNode());
        renderer = context->createRenderer();
        renderer->setRootNode(rootNode);
    }

    updateDirtyNodes();

    animationController->afterNodeSync();

    // Copy the current state of clearing from window into renderer.
    renderer->setClearColor(clearColor);
    QSGAbstractRenderer::ClearMode mode = QSGAbstractRenderer::ClearStencilBuffer | QSGAbstractRenderer::ClearDepthBuffer;
    if (clearBeforeRendering)
        mode |= QSGAbstractRenderer::ClearColorBuffer;
    renderer->setClearMode(mode);

    renderer->setCustomRenderMode(customRenderMode);

    emit q->afterSynchronizing();
    runAndClearJobs(&afterSynchronizingJobs);
    context->endSync();
}


void QQuickWindowPrivate::renderSceneGraph(const QSize &size)
{
    QML_MEMORY_SCOPE_STRING("SceneGraph");
    Q_Q(QQuickWindow);
    if (!renderer)
        return;

    animationController->advance();
    emit q->beforeRendering();
    runAndClearJobs(&beforeRenderingJobs);
    if (!customRenderStage || !customRenderStage->render()) {
        int fboId = 0;
        const qreal devicePixelRatio = q->effectiveDevicePixelRatio();
        if (renderTargetId) {
            QRect rect(QPoint(0, 0), renderTargetSize);
            fboId = renderTargetId;
            renderer->setDeviceRect(rect);
            renderer->setViewportRect(rect);
        } else {
            QRect rect(QPoint(0, 0), devicePixelRatio * size);
            renderer->setDeviceRect(rect);
            renderer->setViewportRect(rect);
        }
        renderer->setProjectionMatrixToRect(QRect(QPoint(0, 0), size));
        renderer->setDevicePixelRatio(devicePixelRatio);

        context->renderNextFrame(renderer, fboId);
    }
    emit q->afterRendering();
    runAndClearJobs(&afterRenderingJobs);
}

QQuickWindowPrivate::QQuickWindowPrivate()
    : contentItem(0)
    , activeFocusItem(0)
#ifndef QT_NO_CURSOR
    , cursorItem(0)
#endif
#ifndef QT_NO_DRAGANDDROP
    , dragGrabber(0)
#endif
    , touchMouseId(-1)
    , touchMouseDevice(nullptr)
    , touchMousePressTimestamp(0)
    , dirtyItemList(0)
    , devicePixelRatio(0)
    , context(0)
    , renderer(0)
    , windowManager(0)
    , renderControl(0)
    , pointerEventRecursionGuard(0)
    , customRenderStage(0)
    , clearColor(Qt::white)
    , clearBeforeRendering(true)
    , persistentGLContext(true)
    , persistentSceneGraph(true)
    , lastWheelEventAccepted(false)
    , componentCompleted(true)
    , lastFocusReason(Qt::OtherFocusReason)
    , renderTarget(0)
    , renderTargetId(0)
    , vaoHelper(0)
    , incubationController(0)
{
#ifndef QT_NO_DRAGANDDROP
    dragGrabber = new QQuickDragGrabber;
#endif
}

QQuickWindowPrivate::~QQuickWindowPrivate()
{
    delete customRenderStage;
    if (QQmlInspectorService *service = QQmlDebugConnector::service<QQmlInspectorService>())
        service->removeWindow(q_func());
}

void QQuickWindowPrivate::init(QQuickWindow *c, QQuickRenderControl *control)
{
    q_ptr = c;

    Q_Q(QQuickWindow);

    contentItem = new QQuickRootItem;
    QQmlEngine::setObjectOwnership(contentItem, QQmlEngine::CppOwnership);
    QQuickItemPrivate *contentItemPrivate = QQuickItemPrivate::get(contentItem);
    contentItemPrivate->window = q;
    contentItemPrivate->windowRefCount = 1;
    contentItemPrivate->flags |= QQuickItem::ItemIsFocusScope;
    contentItem->setSize(q->size());

    customRenderMode = qgetenv("QSG_VISUALIZE");
    renderControl = control;
    if (renderControl)
        QQuickRenderControlPrivate::get(renderControl)->window = q;

    if (!renderControl)
        windowManager = QSGRenderLoop::instance();

    Q_ASSERT(windowManager || renderControl);

    if (QScreen *screen = q->screen())
       devicePixelRatio = screen->devicePixelRatio();

    QSGContext *sg;
    if (renderControl) {
        QQuickRenderControlPrivate *renderControlPriv = QQuickRenderControlPrivate::get(renderControl);
        sg = renderControlPriv->sg;
        context = renderControlPriv->rc;
    } else {
        windowManager->addWindow(q);
        sg = windowManager->sceneGraphContext();
        context = windowManager->createRenderContext(sg);
    }

    q->setSurfaceType(windowManager ? windowManager->windowSurfaceType() : QSurface::OpenGLSurface);
    q->setFormat(sg->defaultSurfaceFormat());

    animationController = new QQuickAnimatorController(q);

    QObject::connect(context, SIGNAL(initialized()), q, SIGNAL(sceneGraphInitialized()), Qt::DirectConnection);
    QObject::connect(context, SIGNAL(invalidated()), q, SIGNAL(sceneGraphInvalidated()), Qt::DirectConnection);
    QObject::connect(context, SIGNAL(invalidated()), q, SLOT(cleanupSceneGraph()), Qt::DirectConnection);

    QObject::connect(q, SIGNAL(focusObjectChanged(QObject*)), q, SIGNAL(activeFocusItemChanged()));
    QObject::connect(q, SIGNAL(screenChanged(QScreen*)), q, SLOT(handleScreenChanged(QScreen*)));

    QObject::connect(q, SIGNAL(frameSwapped()), q, SLOT(runJobsAfterSwap()), Qt::DirectConnection);

    if (QQmlInspectorService *service = QQmlDebugConnector::service<QQmlInspectorService>())
        service->addWindow(q);
}

/*!
    \property QQuickWindow::data
    \internal
*/

QQmlListProperty<QObject> QQuickWindowPrivate::data()
{
    return QQmlListProperty<QObject>(q_func(), 0, QQuickWindowPrivate::data_append,
                                             QQuickWindowPrivate::data_count,
                                             QQuickWindowPrivate::data_at,
                                             QQuickWindowPrivate::data_clear);
}

static QMouseEvent *touchToMouseEvent(QEvent::Type type, const QTouchEvent::TouchPoint &p, QTouchEvent *event, QQuickItem *item, bool transformNeeded = true)
{
    // The touch point local position and velocity are not yet transformed.
    QMouseEvent *me = new QMouseEvent(type, transformNeeded ? item->mapFromScene(p.scenePos()) : p.pos(), p.scenePos(), p.screenPos(),
                                      Qt::LeftButton, (type == QEvent::MouseButtonRelease ? Qt::NoButton : Qt::LeftButton), event->modifiers());
    me->setAccepted(true);
    me->setTimestamp(event->timestamp());
    QVector2D transformedVelocity = p.velocity();
    if (transformNeeded) {
        QQuickItemPrivate *itemPrivate = QQuickItemPrivate::get(item);
        QMatrix4x4 transformMatrix(itemPrivate->windowToItemTransform());
        transformedVelocity = transformMatrix.mapVector(p.velocity()).toVector2D();
    }
    QGuiApplicationPrivate::setMouseEventCapsAndVelocity(me, event->device()->capabilities(), transformedVelocity);
    QGuiApplicationPrivate::setMouseEventSource(me, Qt::MouseEventSynthesizedByQt);
    return me;
}

bool QQuickWindowPrivate::checkIfDoubleClicked(ulong newPressEventTimestamp)
{
    bool doubleClicked;

    if (touchMousePressTimestamp == 0) {
        // just initialize the variable
        touchMousePressTimestamp = newPressEventTimestamp;
        doubleClicked = false;
    } else {
        ulong timeBetweenPresses = newPressEventTimestamp - touchMousePressTimestamp;
        ulong doubleClickInterval = static_cast<ulong>(QGuiApplication::styleHints()->
                mouseDoubleClickInterval());
        doubleClicked = timeBetweenPresses < doubleClickInterval;
        if (doubleClicked) {
            touchMousePressTimestamp = 0;
        } else {
            touchMousePressTimestamp = newPressEventTimestamp;
        }
    }

    return doubleClicked;
}

bool QQuickWindowPrivate::deliverTouchAsMouse(QQuickItem *item, QQuickPointerEvent *pointerEvent)
{
    Q_Q(QQuickWindow);
    auto device = pointerEvent->device();

    // FIXME: make this work for mouse events too and get rid of the asTouchEvent in here.
    Q_ASSERT(pointerEvent->asPointerTouchEvent());
    QTouchEvent *event = pointerEvent->asPointerTouchEvent()->touchEventForItem(item);
    if (!event)
        return false;

    // For each point, check if it is accepted, if not, try the next point.
    // Any of the fingers can become the mouse one.
    // This can happen because a mouse area might not accept an event at some point but another.
    for (int i = 0; i < event->touchPoints().count(); ++i) {
        const QTouchEvent::TouchPoint &p = event->touchPoints().at(i);
        // A new touch point
        if (touchMouseId == -1 && p.state() & Qt::TouchPointPressed) {
            QPointF pos = item->mapFromScene(p.scenePos());

            // probably redundant, we check bounds in the calling function (matchingNewPoints)
            if (!item->contains(pos))
                break;

            qCDebug(DBG_TOUCH_TARGET) << "TP (mouse)" << p.id() << "->" << item;
            QScopedPointer<QMouseEvent> mousePress(touchToMouseEvent(QEvent::MouseButtonPress, p, event, item, false));

            // Send a single press and see if that's accepted
            QCoreApplication::sendEvent(item, mousePress.data());
            event->setAccepted(mousePress->isAccepted());
            if (mousePress->isAccepted()) {
                touchMouseDevice = device;
                touchMouseId = p.id();
                if (!q->mouseGrabberItem())
                    item->grabMouse();
                auto pointerEventPoint = pointerEvent->pointById(p.id());
                pointerEventPoint->setGrabber(item);

                if (checkIfDoubleClicked(event->timestamp())) {
                    QScopedPointer<QMouseEvent> mouseDoubleClick(touchToMouseEvent(QEvent::MouseButtonDblClick, p, event, item, false));
                    QCoreApplication::sendEvent(item, mouseDoubleClick.data());
                    event->setAccepted(mouseDoubleClick->isAccepted());
                    if (!mouseDoubleClick->isAccepted()) {
                        touchMouseId = -1;
                        touchMouseDevice = nullptr;
                    }
                }

                return true;
            }
            // try the next point

        // Touch point was there before and moved
        } else if (touchMouseDevice == device && p.id() == touchMouseId) {
            if (p.state() & Qt::TouchPointMoved) {
                if (QQuickItem *mouseGrabberItem = q->mouseGrabberItem()) {
                    QScopedPointer<QMouseEvent> me(touchToMouseEvent(QEvent::MouseMove, p, event, mouseGrabberItem, false));
                    QCoreApplication::sendEvent(item, me.data());
                    event->setAccepted(me->isAccepted());
                    if (me->isAccepted()) {
                        qCDebug(DBG_TOUCH_TARGET) << "TP (mouse)" << p.id() << "->" << mouseGrabberItem;
                    }
                    return event->isAccepted();
                } else {
                    // no grabber, check if we care about mouse hover
                    // FIXME: this should only happen once, not recursively... I'll ignore it just ignore hover now.
                    // hover for touch???
                    QScopedPointer<QMouseEvent> me(touchToMouseEvent(QEvent::MouseMove, p, event, item, false));
                    if (lastMousePosition.isNull())
                        lastMousePosition = me->windowPos();
                    QPointF last = lastMousePosition;
                    lastMousePosition = me->windowPos();

                    bool accepted = me->isAccepted();
                    bool delivered = deliverHoverEvent(contentItem, me->windowPos(), last, me->modifiers(), me->timestamp(), accepted);
                    if (!delivered) {
                        //take care of any exits
                        accepted = clearHover(me->timestamp());
                    }
                    me->setAccepted(accepted);
                    break;
                }
            } else if (p.state() & Qt::TouchPointReleased) {
                // currently handled point was released
                if (QQuickItem *mouseGrabberItem = q->mouseGrabberItem()) {
                    QScopedPointer<QMouseEvent> me(touchToMouseEvent(QEvent::MouseButtonRelease, p, event, mouseGrabberItem, false));
                    QCoreApplication::sendEvent(item, me.data());

                    if (item->acceptHoverEvents() && p.screenPos() != QGuiApplicationPrivate::lastCursorPosition) {
                        QPointF localMousePos(qInf(), qInf());
                        if (QWindow *w = item->window())
                            localMousePos = item->mapFromScene(w->mapFromGlobal(QGuiApplicationPrivate::lastCursorPosition.toPoint()));
                        QMouseEvent mm(QEvent::MouseMove, localMousePos, QGuiApplicationPrivate::lastCursorPosition,
                                       Qt::NoButton, Qt::NoButton, event->modifiers());
                        QCoreApplication::sendEvent(item, &mm);
                    }
                    if (q->mouseGrabberItem()) // might have ungrabbed due to event
                        q->mouseGrabberItem()->ungrabMouse();

                    touchMouseId = -1;
                    touchMouseDevice = nullptr;
                    return me->isAccepted();
                }
            }
            break;
        }
    }
    return false;
}

void QQuickWindowPrivate::setMouseGrabber(QQuickItem *grabber)
{
    Q_Q(QQuickWindow);
    if (q->mouseGrabberItem() == grabber)
        return;

    qCDebug(DBG_MOUSE_TARGET) << "grabber" << q->mouseGrabberItem() << "->" << grabber;
    QQuickItem *oldGrabber = q->mouseGrabberItem();

    if (grabber && touchMouseId != -1 && touchMouseDevice) {
        // update the touch item for mouse touch id to the new grabber
        qCDebug(DBG_TOUCH_TARGET) << "TP (mouse)" << touchMouseId << "->" << q->mouseGrabberItem();
        auto point = touchMouseDevice->pointerEvent()->pointById(touchMouseId);
        if (point)
            point->setGrabber(grabber);
    } else {
        QQuickPointerEvent *event = QQuickPointerDevice::genericMouseDevice()->pointerEvent();
        Q_ASSERT(event->pointCount() == 1);
        event->point(0)->setGrabber(grabber);
    }

    if (oldGrabber) {
        QEvent e(QEvent::UngrabMouse);
        QSet<QQuickItem *> hasFiltered;
        if (!sendFilteredMouseEvent(oldGrabber->parentItem(), oldGrabber, &e, &hasFiltered))
            oldGrabber->mouseUngrabEvent();
    }
}

void QQuickWindowPrivate::grabTouchPoints(QQuickItem *grabber, const QVector<int> &ids)
{
    QSet<QQuickItem*> ungrab;
    for (int i = 0; i < ids.count(); ++i) {
        // FIXME: deprecate this function, we need a device
        int id = ids.at(i);
        if (Q_UNLIKELY(id < 0)) {
            qWarning("ignoring grab of touchpoint %d", id);
            continue;
        }
        if (id == touchMouseId) {
            auto point = touchMouseDevice->pointerEvent()->pointById(id);
            auto touchMouseGrabber = point->grabber();
            if (touchMouseGrabber) {
                point->setGrabber(nullptr);
                touchMouseGrabber->mouseUngrabEvent();
                ungrab.insert(touchMouseGrabber);
                touchMouseDevice = nullptr;
                touchMouseId = -1;
            }
            qCDebug(DBG_MOUSE_TARGET) << "grabTouchPoints: mouse grabber changed due to grabTouchPoints:" << touchMouseGrabber << "-> null";
        }

        const auto touchDevices = QQuickPointerDevice::touchDevices();
        for (auto device : touchDevices) {
            auto point = device->pointerEvent()->pointById(id);
            if (!point)
                continue;
            QQuickItem *oldGrabber = point->grabber();
            if (oldGrabber == grabber)
                continue;

            point->setGrabber(grabber);
            if (oldGrabber)
                ungrab.insert(oldGrabber);
        }
    }
    for (QQuickItem *oldGrabber : qAsConst(ungrab))
        oldGrabber->touchUngrabEvent();
}

void QQuickWindowPrivate::removeGrabber(QQuickItem *grabber, bool mouse, bool touch)
{
    Q_Q(QQuickWindow);
    if (Q_LIKELY(touch)) {
        const auto touchDevices = QQuickPointerDevice::touchDevices();
        for (auto device : touchDevices) {
            auto pointerEvent = device->pointerEvent();
            for (int i = 0; i < pointerEvent->pointCount(); ++i) {
                if (pointerEvent->point(i)->grabber() == grabber) {
                    pointerEvent->point(i)->setGrabber(nullptr);
                    // FIXME send ungrab event only once
                    grabber->touchUngrabEvent();
                }
            }
        }
    }
    if (Q_LIKELY(mouse) && q->mouseGrabberItem() == grabber) {
        qCDebug(DBG_MOUSE_TARGET) << "removeGrabber" << q->mouseGrabberItem() << "-> null";
        setMouseGrabber(nullptr);
    }
}

/*!
Translates the data in \a touchEvent to this window.  This method leaves the item local positions in
\a touchEvent untouched (these are filled in later).
*/
void QQuickWindowPrivate::translateTouchEvent(QTouchEvent *touchEvent)
{
    QList<QTouchEvent::TouchPoint> touchPoints = touchEvent->touchPoints();
    for (int i = 0; i < touchPoints.count(); ++i) {
        QTouchEvent::TouchPoint &touchPoint = touchPoints[i];

        touchPoint.setSceneRect(touchPoint.rect());
        touchPoint.setStartScenePos(touchPoint.startPos());
        touchPoint.setLastScenePos(touchPoint.lastPos());
    }
    touchEvent->setTouchPoints(touchPoints);
}


static inline bool windowHasFocus(QQuickWindow *win)
{
    const QWindow *focusWindow = QGuiApplication::focusWindow();
    return win == focusWindow || QQuickRenderControl::renderWindowFor(win) == focusWindow;
}

/*!
Set the focus inside \a scope to be \a item.
If the scope contains the active focus item, it will be changed to \a item.
Calls notifyFocusChangesRecur for all changed items.
*/
void QQuickWindowPrivate::setFocusInScope(QQuickItem *scope, QQuickItem *item, Qt::FocusReason reason, FocusOptions options)
{
    Q_Q(QQuickWindow);

    Q_ASSERT(item);
    Q_ASSERT(scope || item == contentItem);

    qCDebug(DBG_FOCUS) << "QQuickWindowPrivate::setFocusInScope():";
    qCDebug(DBG_FOCUS) << "    scope:" << (QObject *)scope;
    if (scope)
        qCDebug(DBG_FOCUS) << "    scopeSubFocusItem:" << (QObject *)QQuickItemPrivate::get(scope)->subFocusItem;
    qCDebug(DBG_FOCUS) << "    item:" << (QObject *)item;
    qCDebug(DBG_FOCUS) << "    activeFocusItem:" << (QObject *)activeFocusItem;

    QQuickItemPrivate *scopePrivate = scope ? QQuickItemPrivate::get(scope) : 0;
    QQuickItemPrivate *itemPrivate = QQuickItemPrivate::get(item);

    QQuickItem *oldActiveFocusItem = 0;
    QQuickItem *currentActiveFocusItem = activeFocusItem;
    QQuickItem *newActiveFocusItem = 0;
    bool sendFocusIn = false;

    lastFocusReason = reason;

    QVarLengthArray<QQuickItem *, 20> changed;

    // Does this change the active focus?
    if (item == contentItem || scopePrivate->activeFocus) {
        oldActiveFocusItem = activeFocusItem;
        if (item->isEnabled()) {
            newActiveFocusItem = item;
            while (newActiveFocusItem->isFocusScope()
                   && newActiveFocusItem->scopedFocusItem()
                   && newActiveFocusItem->scopedFocusItem()->isEnabled()) {
                newActiveFocusItem = newActiveFocusItem->scopedFocusItem();
            }
        } else {
            newActiveFocusItem = scope;
        }

        if (oldActiveFocusItem) {
#ifndef QT_NO_IM
            QGuiApplication::inputMethod()->commit();
#endif

            activeFocusItem = 0;

            QQuickItem *afi = oldActiveFocusItem;
            while (afi && afi != scope) {
                if (QQuickItemPrivate::get(afi)->activeFocus) {
                    QQuickItemPrivate::get(afi)->activeFocus = false;
                    changed << afi;
                }
                afi = afi->parentItem();
            }
        }
    }

    if (item != contentItem && !(options & DontChangeSubFocusItem)) {
        QQuickItem *oldSubFocusItem = scopePrivate->subFocusItem;
        if (oldSubFocusItem) {
            QQuickItemPrivate::get(oldSubFocusItem)->focus = false;
            changed << oldSubFocusItem;
        }

        QQuickItemPrivate::get(item)->updateSubFocusItem(scope, true);
    }

    if (!(options & DontChangeFocusProperty)) {
        if (item != contentItem || windowHasFocus(q)) {
            itemPrivate->focus = true;
            changed << item;
        }
    }

    if (newActiveFocusItem && contentItem->hasFocus()) {
        activeFocusItem = newActiveFocusItem;

        QQuickItemPrivate::get(newActiveFocusItem)->activeFocus = true;
        changed << newActiveFocusItem;

        QQuickItem *afi = newActiveFocusItem->parentItem();
        while (afi && afi != scope) {
            if (afi->isFocusScope()) {
                QQuickItemPrivate::get(afi)->activeFocus = true;
                changed << afi;
            }
            afi = afi->parentItem();
        }
        updateFocusItemTransform();
        sendFocusIn = true;
    }

    // Now that all the state is changed, emit signals & events
    // We must do this last, as this process may result in further changes to focus.
    if (oldActiveFocusItem) {
        QFocusEvent event(QEvent::FocusOut, reason);
        QCoreApplication::sendEvent(oldActiveFocusItem, &event);
    }

    // Make sure that the FocusOut didn't result in another focus change.
    if (sendFocusIn && activeFocusItem == newActiveFocusItem) {
        QFocusEvent event(QEvent::FocusIn, reason);
        QCoreApplication::sendEvent(newActiveFocusItem, &event);
    }

    if (activeFocusItem != currentActiveFocusItem)
        emit q->focusObjectChanged(activeFocusItem);

    if (!changed.isEmpty())
        notifyFocusChangesRecur(changed.data(), changed.count() - 1);
}

void QQuickWindowPrivate::clearFocusInScope(QQuickItem *scope, QQuickItem *item, Qt::FocusReason reason, FocusOptions options)
{
    Q_Q(QQuickWindow);

    Q_ASSERT(item);
    Q_ASSERT(scope || item == contentItem);

    qCDebug(DBG_FOCUS) << "QQuickWindowPrivate::clearFocusInScope():";
    qCDebug(DBG_FOCUS) << "    scope:" << (QObject *)scope;
    qCDebug(DBG_FOCUS) << "    item:" << (QObject *)item;
    qCDebug(DBG_FOCUS) << "    activeFocusItem:" << (QObject *)activeFocusItem;

    QQuickItemPrivate *scopePrivate = 0;
    if (scope) {
        scopePrivate = QQuickItemPrivate::get(scope);
        if ( !scopePrivate->subFocusItem )
            return;//No focus, nothing to do.
    }

    QQuickItem *currentActiveFocusItem = activeFocusItem;
    QQuickItem *oldActiveFocusItem = 0;
    QQuickItem *newActiveFocusItem = 0;

    lastFocusReason = reason;

    QVarLengthArray<QQuickItem *, 20> changed;

    Q_ASSERT(item == contentItem || item == scopePrivate->subFocusItem);

    // Does this change the active focus?
    if (item == contentItem || scopePrivate->activeFocus) {
        oldActiveFocusItem = activeFocusItem;
        newActiveFocusItem = scope;

#ifndef QT_NO_IM
        QGuiApplication::inputMethod()->commit();
#endif

        activeFocusItem = 0;

        if (oldActiveFocusItem) {
            QQuickItem *afi = oldActiveFocusItem;
            while (afi && afi != scope) {
                if (QQuickItemPrivate::get(afi)->activeFocus) {
                    QQuickItemPrivate::get(afi)->activeFocus = false;
                    changed << afi;
                }
                afi = afi->parentItem();
            }
        }
    }

    if (item != contentItem && !(options & DontChangeSubFocusItem)) {
        QQuickItem *oldSubFocusItem = scopePrivate->subFocusItem;
        if (oldSubFocusItem && !(options & DontChangeFocusProperty)) {
            QQuickItemPrivate::get(oldSubFocusItem)->focus = false;
            changed << oldSubFocusItem;
        }

        QQuickItemPrivate::get(item)->updateSubFocusItem(scope, false);

    } else if (!(options & DontChangeFocusProperty)) {
        QQuickItemPrivate::get(item)->focus = false;
        changed << item;
    }

    if (newActiveFocusItem) {
        Q_ASSERT(newActiveFocusItem == scope);
        activeFocusItem = scope;
        updateFocusItemTransform();
    }

    // Now that all the state is changed, emit signals & events
    // We must do this last, as this process may result in further changes to
    // focus.
    if (oldActiveFocusItem) {
        QFocusEvent event(QEvent::FocusOut, reason);
        QCoreApplication::sendEvent(oldActiveFocusItem, &event);
    }

    // Make sure that the FocusOut didn't result in another focus change.
    if (newActiveFocusItem && activeFocusItem == newActiveFocusItem) {
        QFocusEvent event(QEvent::FocusIn, reason);
        QCoreApplication::sendEvent(newActiveFocusItem, &event);
    }

    if (activeFocusItem != currentActiveFocusItem)
        emit q->focusObjectChanged(activeFocusItem);

    if (!changed.isEmpty())
        notifyFocusChangesRecur(changed.data(), changed.count() - 1);
}

void QQuickWindowPrivate::clearFocusObject()
{
    if (activeFocusItem == contentItem)
        return;

    clearFocusInScope(contentItem, QQuickItemPrivate::get(contentItem)->subFocusItem, Qt::OtherFocusReason);
}

void QQuickWindowPrivate::notifyFocusChangesRecur(QQuickItem **items, int remaining)
{
    QPointer<QQuickItem> item(*items);

    if (remaining)
        notifyFocusChangesRecur(items + 1, remaining - 1);

    if (item) {
        QQuickItemPrivate *itemPrivate = QQuickItemPrivate::get(item);

        if (itemPrivate->notifiedFocus != itemPrivate->focus) {
            itemPrivate->notifiedFocus = itemPrivate->focus;
            emit item->focusChanged(itemPrivate->focus);
        }

        if (item && itemPrivate->notifiedActiveFocus != itemPrivate->activeFocus) {
            itemPrivate->notifiedActiveFocus = itemPrivate->activeFocus;
            itemPrivate->itemChange(QQuickItem::ItemActiveFocusHasChanged, itemPrivate->activeFocus);
            emit item->activeFocusChanged(itemPrivate->activeFocus);
        }
    }
}

void QQuickWindowPrivate::dirtyItem(QQuickItem *)
{
    Q_Q(QQuickWindow);
    q->maybeUpdate();
}

void QQuickWindowPrivate::cleanup(QSGNode *n)
{
    Q_Q(QQuickWindow);

    Q_ASSERT(!cleanupNodeList.contains(n));
    cleanupNodeList.append(n);
    q->maybeUpdate();
}

/*!
    \qmltype Window
    \instantiates QQuickWindow
    \inqmlmodule QtQuick.Window
    \ingroup qtquick-visual
    \brief Creates a new top-level window

    The Window object creates a new top-level window for a Qt Quick scene. It automatically sets up the
    window for use with \c {QtQuick 2.x} graphical types.

    To use this type, you will need to import the module with the following line:
    \code
    import QtQuick.Window 2.2
    \endcode

    Omitting this import will allow you to have a QML environment without
    access to window system features.

    A Window can be declared inside an Item or inside another Window; in that
    case the inner Window will automatically become "transient for" the outer
    Window: that is, most platforms will show it centered upon the outer window
    by default, and there may be other platform-dependent behaviors, depending
    also on the \l flags. If the nested window is intended to be a dialog in
    your application, you should also set \l flags to Qt.Dialog, because some
    window managers will not provide the centering behavior without that flag.
    You can also declare multiple windows inside a top-level \l QtObject, in which
    case the windows will have no transient relationship.

    Alternatively you can set or bind \l x and \l y to position the Window
    explicitly on the screen.

    When the user attempts to close a window, the \l closing signal will be
    emitted. You can force the window to stay open (for example to prompt the
    user to save changes) by writing an \c onClosing handler and setting
    \c {close.accepted = false}.
*/
/*!
    \class QQuickWindow
    \since 5.0

    \inmodule QtQuick

    \brief The QQuickWindow class provides the window for displaying a graphical QML scene

    QQuickWindow provides the graphical scene management needed to interact with and display
    a scene of QQuickItems.

    A QQuickWindow always has a single invisible root item. To add items to this window,
    reparent the items to the root item or to an existing item in the scene.

    For easily displaying a scene from a QML file, see \l{QQuickView}.

    \section1 Rendering

    QQuickWindow uses a scene graph to represent what needs to be rendered.
    This scene graph is disconnected from the QML scene and
    potentially lives in another thread, depending on the platform
    implementation. Since the rendering scene graph lives
    independently from the QML scene, it can also be completely
    released without affecting the state of the QML scene.

    The sceneGraphInitialized() signal is emitted on the rendering
    thread before the QML scene is rendered to the screen for the
    first time. If the rendering scene graph has been released, the
    signal will be emitted again before the next frame is rendered.


    \section2 Integration with OpenGL

    When using the default OpenGL adaptation, it is possible to integrate
    OpenGL calls directly into the QQuickWindow using the same OpenGL
    context as the Qt Quick Scene Graph. This is done by connecting to the
    QQuickWindow::beforeRendering() or QQuickWindow::afterRendering()
    signal.

    \note When using QQuickWindow::beforeRendering(), make sure to
    disable clearing before rendering with
    QQuickWindow::setClearBeforeRendering().


    \section2 Exposure and Visibility

    When a QQuickWindow instance is deliberately hidden with hide() or
    setVisible(false), it will stop rendering and its scene graph and
    graphics context might be released. The sceneGraphInvalidated()
    signal will be emitted when this happens.

    \warning It is crucial that graphics operations and interaction with
    the scene graph happens exclusively on the rendering thread,
    primarily during the updatePaintNode() phase.

    \warning As signals related to rendering might be emitted from the
    rendering thread, connections should be made using
    Qt::DirectConnection.


    \section2 Resource Management

    QML will try to cache images and scene graph nodes to
    improve performance, but in some low-memory scenarios it might be
    required to aggressively release these resources. The
    releaseResources() can be used to force the clean up of certain
    resources. Calling releaseResources() may result in the entire
    scene graph and in the case of the OpenGL adaptation the associated
    context will be deleted. The sceneGraphInvalidated() signal will be
    emitted when this happens.

    \note All classes with QSG prefix should be used solely on the scene graph's
    rendering thread. See \l {Scene Graph and Rendering} for more information.

    \section2 Context and surface formats

    While it is possible to specify a QSurfaceFormat for every QQuickWindow by
    calling the member function setFormat(), windows may also be created from
    QML by using the Window and ApplicationWindow elements. In this case there
    is no C++ code involved in the creation of the window instance, yet
    applications may still wish to set certain surface format values, for
    example to request a given OpenGL version or profile. Such applications can
    call the static function QSurfaceFormat::setDefaultFormat() at startup. The
    specified format will be used for all Quick windows created afterwards.

    \sa {Scene Graph - OpenGL Under QML}
*/

/*!
    Constructs a window for displaying a QML scene with parent window \a parent.
*/
QQuickWindow::QQuickWindow(QWindow *parent)
    : QQuickWindow(*new QQuickWindowPrivate, parent)
{
}



/*!
    \internal
*/
QQuickWindow::QQuickWindow(QQuickWindowPrivate &dd, QWindow *parent)
    : QWindow(dd, parent)
{
    Q_D(QQuickWindow);
    d->init(this);
}

/*!
    \internal
*/
QQuickWindow::QQuickWindow(QQuickRenderControl *control)
    : QWindow(*(new QQuickWindowPrivate), 0)
{
    Q_D(QQuickWindow);
    d->init(this, control);
}



/*!
    Destroys the window.
*/
QQuickWindow::~QQuickWindow()
{
    Q_D(QQuickWindow);

    if (d->renderControl) {
        QQuickRenderControlPrivate::get(d->renderControl)->windowDestroyed();
    } else if (d->windowManager) {
        d->windowManager->removeWindow(this);
        d->windowManager->windowDestroyed(this);
    }

    delete d->incubationController; d->incubationController = 0;
#ifndef QT_NO_DRAGANDDROP
    delete d->dragGrabber; d->dragGrabber = 0;
#endif
    delete d->contentItem; d->contentItem = 0;

    d->renderJobMutex.lock();
    qDeleteAll(d->beforeSynchronizingJobs);
    d->beforeSynchronizingJobs.clear();
    qDeleteAll(d->afterSynchronizingJobs);
    d->afterSynchronizingJobs.clear();
    qDeleteAll(d->beforeRenderingJobs);
    d->beforeRenderingJobs.clear();
    qDeleteAll(d->afterRenderingJobs);
    d->afterRenderingJobs.clear();
    qDeleteAll(d->afterSwapJobs);
    d->afterSwapJobs.clear();
    d->renderJobMutex.unlock();

    // It is important that the pixmap cache is cleaned up during shutdown.
    // Besides playing nice, this also solves a practical problem that
    // QQuickTextureFactory implementations in other libraries need
    // have their destructors loaded while they the library is still
    // loaded into memory.
    QQuickPixmap::purgeCache();
}

/*!
    This function tries to release redundant resources currently held by the QML scene.

    Calling this function might result in the scene graph and the OpenGL context used
    for rendering being released to release graphics memory. If this happens, the
    sceneGraphInvalidated() signal will be called, allowing users to clean up their
    own graphics resources. The setPersistentOpenGLContext() and setPersistentSceneGraph()
    functions can be used to prevent this from happening, if handling the cleanup is
    not feasible in the application, at the cost of higher memory usage.

    \sa sceneGraphInvalidated(), setPersistentOpenGLContext(), setPersistentSceneGraph()
 */

void QQuickWindow::releaseResources()
{
    Q_D(QQuickWindow);
    if (d->windowManager)
        d->windowManager->releaseResources(this);
    QQuickPixmap::purgeCache();
}



/*!
    Sets whether the OpenGL context should be preserved, and cannot be
    released until the last window is deleted, to \a persistent. The
    default value is true.

    The OpenGL context can be released to free up graphics resources
    when the window is obscured, hidden or not rendering. When this
    happens is implementation specific.

    The QOpenGLContext::aboutToBeDestroyed() signal is emitted from
    the QQuickWindow::openglContext() when the OpenGL context is about
    to be released.  The QQuickWindow::sceneGraphInitialized() signal
    is emitted when a new OpenGL context is created for this
    window. Make a Qt::DirectConnection to these signals to be
    notified.

    The OpenGL context is still released when the last QQuickWindow is
    deleted.

    \note This only has an effect when using the default OpenGL scene
    graph adaptation.

    \sa setPersistentSceneGraph(),
    QOpenGLContext::aboutToBeDestroyed(), sceneGraphInitialized()
 */

void QQuickWindow::setPersistentOpenGLContext(bool persistent)
{
    Q_D(QQuickWindow);
    d->persistentGLContext = persistent;
}



/*!
    Returns whether the OpenGL context can be released during the
    lifetime of the QQuickWindow.

    \note This is a hint. When and how this happens is implementation
    specific.  It also only has an effect when using the default OpenGL
    scene graph adaptation
 */

bool QQuickWindow::isPersistentOpenGLContext() const
{
    Q_D(const QQuickWindow);
    return d->persistentGLContext;
}



/*!
    Sets whether the scene graph nodes and resources can be released
    to \a persistent.  The default value is true.

    The scene graph nodes and resources can be released to free up
    graphics resources when the window is obscured, hidden or not
    rendering. When this happens is implementation specific.

    The QQuickWindow::sceneGraphInvalidated() signal is emitted when
    cleanup occurs. The QQuickWindow::sceneGraphInitialized() signal
    is emitted when a new scene graph is recreated for this
    window. Make a Qt::DirectConnection to these signals to be
    notified.

    The scene graph nodes and resources are still released when the
    last QQuickWindow is deleted.

    \sa setPersistentOpenGLContext(),
    sceneGraphInvalidated(), sceneGraphInitialized()
 */

void QQuickWindow::setPersistentSceneGraph(bool persistent)
{
    Q_D(QQuickWindow);
    d->persistentSceneGraph = persistent;
}



/*!
    Returns whether the scene graph nodes and resources can be
    released during the lifetime of this QQuickWindow.

    \note This is a hint. When and how this happens is implementation
    specific.
 */

bool QQuickWindow::isPersistentSceneGraph() const
{
    Q_D(const QQuickWindow);
    return d->persistentSceneGraph;
}




/*!
    \qmlattachedproperty Item Window::contentItem
    \since 5.4

    This attached property holds the invisible root item of the scene or
    \c null if the item is not in a window. The Window attached property
    can be attached to any Item.
*/

/*!
    \property QQuickWindow::contentItem
    \brief The invisible root item of the scene.

  A QQuickWindow always has a single invisible root item containing all of its content.
  To add items to this window, reparent the items to the contentItem or to an existing
  item in the scene.
*/
QQuickItem *QQuickWindow::contentItem() const
{
    Q_D(const QQuickWindow);

    return d->contentItem;
}

/*!
    \property QQuickWindow::activeFocusItem

    \brief The item which currently has active focus or \c null if there is
    no item with active focus.
*/
QQuickItem *QQuickWindow::activeFocusItem() const
{
    Q_D(const QQuickWindow);

    return d->activeFocusItem;
}

/*!
  \internal
  \reimp
*/
QObject *QQuickWindow::focusObject() const
{
    Q_D(const QQuickWindow);

    if (d->activeFocusItem)
        return d->activeFocusItem;
    return const_cast<QQuickWindow*>(this);
}


/*!
  Returns the item which currently has the mouse grab.
*/
QQuickItem *QQuickWindow::mouseGrabberItem() const
{
    Q_D(const QQuickWindow);

    if (d->touchMouseId != -1 && d->touchMouseDevice) {
        QQuickPointerEvent *event = d->touchMouseDevice->pointerEvent();
        auto point = event->pointById(d->touchMouseId);
        Q_ASSERT(point);
        return point->grabber();
    }

    QQuickPointerEvent *event = QQuickPointerDevice::genericMouseDevice()->pointerEvent();
    Q_ASSERT(event->pointCount());
    return event->point(0)->grabber();
}


bool QQuickWindowPrivate::clearHover(ulong timestamp)
{
    Q_Q(QQuickWindow);
    if (hoverItems.isEmpty())
        return false;

    QPointF pos = q->mapFromGlobal(QGuiApplicationPrivate::lastCursorPosition.toPoint());

    bool accepted = false;
    for (QQuickItem* item : qAsConst(hoverItems))
        accepted = sendHoverEvent(QEvent::HoverLeave, item, pos, pos, QGuiApplication::keyboardModifiers(), timestamp, true) || accepted;
    hoverItems.clear();
    return accepted;
}

/*! \reimp */
bool QQuickWindow::event(QEvent *e)
{
    Q_D(QQuickWindow);

    switch (e->type()) {

    case QEvent::TouchBegin:
    case QEvent::TouchUpdate:
    case QEvent::TouchEnd: {
        QTouchEvent *touch = static_cast<QTouchEvent*>(e);
        d->handleTouchEvent(touch);
        if (Q_LIKELY(QCoreApplication::testAttribute(Qt::AA_SynthesizeMouseForUnhandledTouchEvents))) {
            // we consume all touch events ourselves to avoid duplicate
            // mouse delivery by QtGui mouse synthesis
            e->accept();
        }
        return true;
    }
        break;
    case QEvent::TouchCancel:
        // return in order to avoid the QWindow::event below
        return d->deliverTouchCancelEvent(static_cast<QTouchEvent*>(e));
        break;
    case QEvent::Enter: {
        QEnterEvent *enter = static_cast<QEnterEvent*>(e);
        bool accepted = enter->isAccepted();
        bool delivered = d->deliverHoverEvent(d->contentItem, enter->windowPos(), d->lastMousePosition,
            QGuiApplication::keyboardModifiers(), 0L, accepted);
        enter->setAccepted(accepted);
        return delivered;
    }
        break;
    case QEvent::Leave:
        d->clearHover();
        d->lastMousePosition = QPointF();
        break;
#ifndef QT_NO_DRAGANDDROP
    case QEvent::DragEnter:
    case QEvent::DragLeave:
    case QEvent::DragMove:
    case QEvent::Drop:
        d->deliverDragEvent(d->dragGrabber, e);
        break;
#endif
    case QEvent::WindowDeactivate:
        contentItem()->windowDeactivateEvent();
        break;
    case QEvent::Close: {
        // TOOD Qt 6 (binary incompatible)
        // closeEvent(static_cast<QCloseEvent *>(e));
        QQuickCloseEvent qev;
        qev.setAccepted(e->isAccepted());
        emit closing(&qev);
        e->setAccepted(qev.isAccepted());
        } break;
    case QEvent::FocusAboutToChange:
#ifndef QT_NO_IM
        if (d->activeFocusItem)
            qGuiApp->inputMethod()->commit();
#endif
        if (mouseGrabberItem())
            mouseGrabberItem()->ungrabMouse();
        break;
    case QEvent::UpdateRequest: {
        if (d->windowManager)
            d->windowManager->handleUpdateRequest(this);
        break;
    }
#ifndef QT_NO_GESTURES
    case QEvent::NativeGesture:
        d->deliverNativeGestureEvent(d->contentItem, static_cast<QNativeGestureEvent*>(e));
        break;
#endif
    case QEvent::ShortcutOverride:
        if (d->activeFocusItem)
            QCoreApplication::sendEvent(d->activeFocusItem, e);
        return true;
    default:
        break;
    }

    if (e->type() == QEvent::Type(QQuickWindowPrivate::FullUpdateRequest))
        update();

    return QWindow::event(e);
}

/*! \reimp */
void QQuickWindow::keyPressEvent(QKeyEvent *e)
{
    Q_D(QQuickWindow);
    Q_QUICK_INPUT_PROFILE(QQuickProfiler::Key, QQuickProfiler::InputKeyPress, e->key(),
                          e->modifiers());
    d->deliverKeyEvent(e);
}

/*! \reimp */
void QQuickWindow::keyReleaseEvent(QKeyEvent *e)
{
    Q_D(QQuickWindow);
    Q_QUICK_INPUT_PROFILE(QQuickProfiler::Key, QQuickProfiler::InputKeyRelease, e->key(),
                          e->modifiers());
    d->deliverKeyEvent(e);
}

void QQuickWindowPrivate::deliverKeyEvent(QKeyEvent *e)
{
    Q_Q(QQuickWindow);

    if (activeFocusItem)
        q->sendEvent(activeFocusItem, e);
}

QMouseEvent *QQuickWindowPrivate::cloneMouseEvent(QMouseEvent *event, QPointF *transformedLocalPos)
{
    int caps = QGuiApplicationPrivate::mouseEventCaps(event);
    QVector2D velocity = QGuiApplicationPrivate::mouseEventVelocity(event);
    QMouseEvent *me = new QMouseEvent(event->type(),
                                      transformedLocalPos ? *transformedLocalPos : event->localPos(),
                                      event->windowPos(), event->screenPos(),
                                      event->button(), event->buttons(), event->modifiers());
    QGuiApplicationPrivate::setMouseEventCapsAndVelocity(me, caps, velocity);
    QGuiApplicationPrivate::setMouseEventSource(me, QGuiApplicationPrivate::mouseEventSource(event));
    me->setTimestamp(event->timestamp());
    return me;
}

void QQuickWindowPrivate::deliverMouseEvent(QQuickPointerMouseEvent *pointerEvent)
{
    Q_Q(QQuickWindow);
    auto point = pointerEvent->point(0);
    lastMousePosition = point->scenePos();
    QQuickItem *grabber = point->grabber();
    if (grabber) {
        // if the update consists of changing button state, then don't accept it
        // unless the button is one in which the item is interested
        if (pointerEvent->button() != Qt::NoButton
                && grabber->acceptedMouseButtons()
                && !(grabber->acceptedMouseButtons() & pointerEvent->button())) {
            pointerEvent->setAccepted(false);
            return;
        }

        // send update
        QPointF localPos = grabber->mapFromScene(lastMousePosition);
        auto me = pointerEvent->asMouseEvent(localPos);
        me->accept();
        q->sendEvent(grabber, me);
        point->setAccepted(me->isAccepted());

        // release event, make sure to ungrab if there still is a grabber
        if (me->type() == QEvent::MouseButtonRelease && !me->buttons() && q->mouseGrabberItem())
            q->mouseGrabberItem()->ungrabMouse();
    } else {
        // send initial press
        bool delivered = false;
        if (pointerEvent->isPressEvent()) {
            QSet<QQuickItem*> hasFiltered;
            delivered = deliverPressEvent(pointerEvent, &hasFiltered);
        }

        if (!delivered)
            // make sure not to accept unhandled events
            pointerEvent->setAccepted(false);
    }
}

bool QQuickWindowPrivate::sendHoverEvent(QEvent::Type type, QQuickItem *item,
                                      const QPointF &scenePos, const QPointF &lastScenePos,
                                      Qt::KeyboardModifiers modifiers, ulong timestamp,
                                      bool accepted)
{
    const QTransform transform = QQuickItemPrivate::get(item)->windowToItemTransform();

    //create copy of event
    QHoverEvent hoverEvent(type, transform.map(scenePos), transform.map(lastScenePos), modifiers);
    hoverEvent.setTimestamp(timestamp);
    hoverEvent.setAccepted(accepted);

    QSet<QQuickItem *> hasFiltered;
    if (sendFilteredMouseEvent(item->parentItem(), item, &hoverEvent, &hasFiltered)) {
        return true;
    }

    QCoreApplication::sendEvent(item, &hoverEvent);

    return hoverEvent.isAccepted();
}

bool QQuickWindowPrivate::deliverHoverEvent(QQuickItem *item, const QPointF &scenePos, const QPointF &lastScenePos,
                                         Qt::KeyboardModifiers modifiers, ulong timestamp, bool &accepted)
{
    Q_Q(QQuickWindow);
    QQuickItemPrivate *itemPrivate = QQuickItemPrivate::get(item);

    if (itemPrivate->flags & QQuickItem::ItemClipsChildrenToShape) {
        QPointF p = item->mapFromScene(scenePos);
        if (!item->contains(p))
            return false;
    }

    qCDebug(DBG_HOVER_TRACE) << q << item << scenePos << lastScenePos << "subtreeHoverEnabled" << itemPrivate->subtreeHoverEnabled;
    if (itemPrivate->subtreeHoverEnabled) {
        QList<QQuickItem *> children = itemPrivate->paintOrderChildItems();
        for (int ii = children.count() - 1; ii >= 0; --ii) {
            QQuickItem *child = children.at(ii);
            if (!child->isVisible() || !child->isEnabled() || QQuickItemPrivate::get(child)->culled)
                continue;
            if (deliverHoverEvent(child, scenePos, lastScenePos, modifiers, timestamp, accepted))
                return true;
        }
    }

    if (itemPrivate->hoverEnabled) {
        QPointF p = item->mapFromScene(scenePos);
        if (item->contains(p)) {
            if (!hoverItems.isEmpty() && hoverItems.at(0) == item) {
                //move
                accepted = sendHoverEvent(QEvent::HoverMove, item, scenePos, lastScenePos, modifiers, timestamp, accepted);
            } else {
                QList<QQuickItem *> itemsToHover;
                QQuickItem* parent = item;
                itemsToHover << item;
                while ((parent = parent->parentItem()))
                    itemsToHover << parent;

                // Leaving from previous hovered items until we reach the item or one of its ancestors.
                while (!hoverItems.isEmpty() && !itemsToHover.contains(hoverItems.at(0))) {
                    QQuickItem *hoverLeaveItem = hoverItems.takeFirst();
                    sendHoverEvent(QEvent::HoverLeave, hoverLeaveItem, scenePos, lastScenePos, modifiers, timestamp, accepted);
                }

                if (!hoverItems.isEmpty() && hoverItems.at(0) == item) {//Not entering a new Item
                    // ### Shouldn't we send moves for the parent items as well?
                    accepted = sendHoverEvent(QEvent::HoverMove, item, scenePos, lastScenePos, modifiers, timestamp, accepted);
                } else {
                    // Enter items that are not entered yet.
                    int startIdx = -1;
                    if (!hoverItems.isEmpty())
                        startIdx = itemsToHover.indexOf(hoverItems.at(0)) - 1;
                    if (startIdx == -1)
                        startIdx = itemsToHover.count() - 1;

                    for (int i = startIdx; i >= 0; i--) {
                        QQuickItem *itemToHover = itemsToHover.at(i);
                        QQuickItemPrivate *itemToHoverPrivate = QQuickItemPrivate::get(itemToHover);
                        // The item may be about to be deleted or reparented to another window
                        // due to another hover event delivered in this function. If that is the
                        // case, sending a hover event here will cause a crash or other bad
                        // behavior when the leave event is generated. Checking
                        // itemToHoverPrivate->window here prevents that case.
                        if (itemToHoverPrivate->window == q && itemToHoverPrivate->hoverEnabled) {
                            hoverItems.prepend(itemToHover);
                            sendHoverEvent(QEvent::HoverEnter, itemToHover, scenePos, lastScenePos, modifiers, timestamp, accepted);
                        }
                    }
                }
            }
            return true;
        }
    }

    return false;
}

#ifndef QT_NO_WHEELEVENT
bool QQuickWindowPrivate::deliverWheelEvent(QQuickItem *item, QWheelEvent *event)
{
    QQuickItemPrivate *itemPrivate = QQuickItemPrivate::get(item);

    if (itemPrivate->flags & QQuickItem::ItemClipsChildrenToShape) {
        QPointF p = item->mapFromScene(event->posF());
        if (!item->contains(p))
            return false;
    }

    QList<QQuickItem *> children = itemPrivate->paintOrderChildItems();
    for (int ii = children.count() - 1; ii >= 0; --ii) {
        QQuickItem *child = children.at(ii);
        if (!child->isVisible() || !child->isEnabled() || QQuickItemPrivate::get(child)->culled)
            continue;
        if (deliverWheelEvent(child, event))
            return true;
    }

    QPointF p = item->mapFromScene(event->posF());

    if (item->contains(p)) {
        QWheelEvent wheel(p, p, event->pixelDelta(), event->angleDelta(), event->delta(),
                          event->orientation(), event->buttons(), event->modifiers(), event->phase(), event->source(), event->inverted());
        wheel.setTimestamp(event->timestamp());
        wheel.accept();
        QCoreApplication::sendEvent(item, &wheel);
        if (wheel.isAccepted()) {
            event->accept();
            return true;
        }
    }

    return false;
}

/*! \reimp */
void QQuickWindow::wheelEvent(QWheelEvent *event)
{
    Q_D(QQuickWindow);
    Q_QUICK_INPUT_PROFILE(QQuickProfiler::Mouse, QQuickProfiler::InputMouseWheel,
                          event->angleDelta().x(), event->angleDelta().y());

    qCDebug(DBG_MOUSE) << "QQuickWindow::wheelEvent()" << event->pixelDelta() << event->angleDelta() << event->phase();

    //if the actual wheel event was accepted, accept the compatibility wheel event and return early
    if (d->lastWheelEventAccepted && event->angleDelta().isNull() && event->phase() == Qt::ScrollUpdate)
        return;

    event->ignore();
    d->deliverWheelEvent(d->contentItem, event);
    d->lastWheelEventAccepted = event->isAccepted();
}
#endif // QT_NO_WHEELEVENT

#ifndef QT_NO_GESTURES
bool QQuickWindowPrivate::deliverNativeGestureEvent(QQuickItem *item, QNativeGestureEvent *event)
{
    QQuickItemPrivate *itemPrivate = QQuickItemPrivate::get(item);

    if ((itemPrivate->flags & QQuickItem::ItemClipsChildrenToShape) && !item->contains(event->localPos()))
        return false;

    QList<QQuickItem *> children = itemPrivate->paintOrderChildItems();
    for (int ii = children.count() - 1; ii >= 0; --ii) {
        QQuickItem *child = children.at(ii);
        if (!child->isVisible() || !child->isEnabled() || QQuickItemPrivate::get(child)->culled)
            continue;
        if (deliverNativeGestureEvent(child, event))
            return true;
    }

    QPointF p = item->mapFromScene(event->localPos());

    if (item->contains(p)) {
        QNativeGestureEvent copy(event->gestureType(), p, event->windowPos(), event->screenPos(),
                                 event->value(), 0L, 0L); // TODO can't copy things I can't access
        event->accept();
        item->event(&copy);
        if (copy.isAccepted()) {
            event->accept();
            return true;
        }
    }

    return false;
}
#endif // QT_NO_GESTURES

bool QQuickWindowPrivate::deliverTouchCancelEvent(QTouchEvent *event)
{
    qCDebug(DBG_TOUCH) << event;
    Q_Q(QQuickWindow);

    // A TouchCancel event will typically not contain any points.
    // Deliver it to all items that have active touches.
    QQuickPointerEvent *pointerEvent = QQuickPointerDevice::touchDevice(event->device())->pointerEvent();
    QVector<QQuickItem *> grabbers = pointerEvent->grabbers();

    for (QQuickItem *grabber: qAsConst(grabbers)) {
        q->sendEvent(grabber, event);
    }
    touchMouseId = -1;
    touchMouseDevice = nullptr;
    if (q->mouseGrabberItem())
        q->mouseGrabberItem()->ungrabMouse();

    // The next touch event can only be a TouchBegin so clean up.
    pointerEvent->clearGrabbers();
    return true;
}

void QQuickWindowPrivate::deliverDelayedTouchEvent()
{
    // Deliver and delete delayedTouch.
    // Set delayedTouch to 0 before delivery to avoid redelivery in case of
    // event loop recursions (e.g if it the touch starts a dnd session).
    QScopedPointer<QTouchEvent> e(delayedTouch.take());
    deliverPointerEvent(pointerEventInstance(e.data()));
}

static bool qquickwindow_no_touch_compression = qEnvironmentVariableIsSet("QML_NO_TOUCH_COMPRESSION");

bool QQuickWindowPrivate::compressTouchEvent(QTouchEvent *event)
{
    Q_Q(QQuickWindow);
    Qt::TouchPointStates states = event->touchPointStates();
    if (((states & (Qt::TouchPointMoved | Qt::TouchPointStationary)) == 0)
        || ((states & (Qt::TouchPointPressed | Qt::TouchPointReleased)) != 0)) {
        // we can only compress something that isn't a press or release
        return false;
    }

    if (!delayedTouch) {
        delayedTouch.reset(new QTouchEvent(event->type(), event->device(), event->modifiers(), event->touchPointStates(), event->touchPoints()));
        delayedTouch->setTimestamp(event->timestamp());
        if (renderControl)
            QQuickRenderControlPrivate::get(renderControl)->maybeUpdate();
        else if (windowManager)
            windowManager->maybeUpdate(q);
        return true;
    }

    // check if this looks like the last touch event
    if (delayedTouch->type() == event->type() &&
            delayedTouch->device() == event->device() &&
            delayedTouch->modifiers() == event->modifiers() &&
            delayedTouch->touchPoints().count() == event->touchPoints().count())
    {
        // possible match.. is it really the same?
        bool mismatch = false;

        QList<QTouchEvent::TouchPoint> tpts = event->touchPoints();
        Qt::TouchPointStates states;
        for (int i = 0; i < event->touchPoints().count(); ++i) {
            const QTouchEvent::TouchPoint &tp = tpts.at(i);
            const QTouchEvent::TouchPoint &tpDelayed = delayedTouch->touchPoints().at(i);
            if (tp.id() != tpDelayed.id()) {
                mismatch = true;
                break;
            }

            if (tpDelayed.state() == Qt::TouchPointMoved && tp.state() == Qt::TouchPointStationary)
                tpts[i].setState(Qt::TouchPointMoved);
            tpts[i].setLastPos(tpDelayed.lastPos());
            tpts[i].setLastScenePos(tpDelayed.lastScenePos());
            tpts[i].setLastScreenPos(tpDelayed.lastScreenPos());
            tpts[i].setLastNormalizedPos(tpDelayed.lastNormalizedPos());

            states |= tpts.at(i).state();
        }

        // matching touch event? then merge the new event into the old one
        if (!mismatch) {
            delayedTouch->setTouchPoints(tpts);
            delayedTouch->setTimestamp(event->timestamp());
            return true;
        }
    }

    // merging wasn't possible, so deliver the delayed event first, and then delay this one
    deliverDelayedTouchEvent();
    delayedTouch.reset(new QTouchEvent(event->type(), event->device(), event->modifiers(), event->touchPointStates(), event->touchPoints()));
    delayedTouch->setTimestamp(event->timestamp());
    return true;
}

// entry point for touch event delivery:
// - translate the event to window coordinates
// - compress the event instead of delivering it if applicable
// - call deliverTouchPoints to actually dispatch the points
void QQuickWindowPrivate::handleTouchEvent(QTouchEvent *event)
{
    translateTouchEvent(event);
    if (event->touchPoints().size())
        lastMousePosition = event->touchPoints().at(0).pos();

    qCDebug(DBG_TOUCH) << event;

    if (qquickwindow_no_touch_compression || pointerEventRecursionGuard) {
        deliverPointerEvent(pointerEventInstance(event));
        return;
    }

    if (!compressTouchEvent(event)) {
        if (delayedTouch)
            deliverDelayedTouchEvent();
        deliverPointerEvent(pointerEventInstance(event));
    }
}

/*! \reimp */
void QQuickWindow::mousePressEvent(QMouseEvent *event)
{
    Q_D(QQuickWindow);
    d->handleMouseEvent(event);
}
/*! \reimp */
void QQuickWindow::mouseMoveEvent(QMouseEvent *event)
{
    Q_D(QQuickWindow);
    d->handleMouseEvent(event);
}
/*! \reimp */
void QQuickWindow::mouseDoubleClickEvent(QMouseEvent *event)
{
    Q_D(QQuickWindow);
    d->handleMouseEvent(event);
}
/*! \reimp */
void QQuickWindow::mouseReleaseEvent(QMouseEvent *event)
{
    Q_D(QQuickWindow);
    d->handleMouseEvent(event);
}

void QQuickWindowPrivate::handleMouseEvent(QMouseEvent *event)
{
    Q_Q(QQuickWindow);

    if (event->source() == Qt::MouseEventSynthesizedBySystem) {
        event->accept();
        return;
    }
    qCDebug(DBG_MOUSE) << "QQuickWindow::handleMouseEvent()" << event->type() << event->localPos() << event->button() << event->buttons();

    switch (event->type()) {
    case QEvent::MouseButtonPress:
        Q_QUICK_INPUT_PROFILE(QQuickProfiler::Mouse, QQuickProfiler::InputMousePress, event->button(),
                              event->buttons());
        deliverPointerEvent(pointerEventInstance(event));
        break;
    case QEvent::MouseButtonRelease:
        Q_QUICK_INPUT_PROFILE(QQuickProfiler::Mouse, QQuickProfiler::InputMouseRelease, event->button(),
                              event->buttons());
        deliverPointerEvent(pointerEventInstance(event));
        break;
    case QEvent::MouseButtonDblClick:
        Q_QUICK_INPUT_PROFILE(QQuickProfiler::Mouse, QQuickProfiler::InputMouseDoubleClick,
                              event->button(), event->buttons());
        deliverPointerEvent(pointerEventInstance(event));
        break;
    case QEvent::MouseMove:
        Q_QUICK_INPUT_PROFILE(QQuickProfiler::Mouse, QQuickProfiler::InputMouseMove,
                              event->localPos().x(), event->localPos().y());

        qCDebug(DBG_HOVER_TRACE) << this;

    #ifndef QT_NO_CURSOR
        updateCursor(event->windowPos());
    #endif

        if (!q->mouseGrabberItem()) {
            QPointF last = lastMousePosition.isNull() ? event->windowPos() : lastMousePosition;
            lastMousePosition = event->windowPos();

            bool accepted = event->isAccepted();
            bool delivered = deliverHoverEvent(contentItem, event->windowPos(), last, event->modifiers(), event->timestamp(), accepted);
            if (!delivered) {
                //take care of any exits
                accepted = clearHover(event->timestamp());
            }
            event->setAccepted(accepted);
            return;
        }
        deliverPointerEvent(pointerEventInstance(event));
        break;
    default:
        Q_ASSERT(false);
        break;
    }
}

void QQuickWindowPrivate::flushFrameSynchronousEvents()
{
    Q_Q(QQuickWindow);

    if (delayedTouch) {
        deliverDelayedTouchEvent();

        // Touch events which constantly start animations (such as a behavior tracking
        // the mouse point) need animations to start.
        QQmlAnimationTimer *ut = QQmlAnimationTimer::instance();
        if (ut && ut->hasStartAnimationPending())
            ut->startAnimations();
    }

    // Once per frame, send a synthetic hover, in case items have changed position.
    // For instance, during animation (including the case of a ListView
    // whose delegates contain MouseAreas), a MouseArea needs to know
    // whether it has moved into a position where it is now under the cursor.
    if (!q->mouseGrabberItem() && !lastMousePosition.isNull()) {
        bool accepted = false;
        bool delivered = deliverHoverEvent(contentItem, lastMousePosition, lastMousePosition, QGuiApplication::keyboardModifiers(), 0, accepted);
        if (!delivered)
            clearHover(); // take care of any exits
    }
}

/*!
    \internal
    Returns a QQuickPointerEvent instance suitable for wrapping and delivering \a event.

    There is a unique instance per QQuickPointerDevice, which is determined
    from \a event's device.
*/
QQuickPointerEvent *QQuickWindowPrivate::pointerEventInstance(QEvent *event)
{
    QQuickPointerDevice *dev = nullptr;
    switch (event->type()) {
    case QEvent::MouseButtonPress:
    case QEvent::MouseButtonRelease:
    case QEvent::MouseButtonDblClick:
    case QEvent::MouseMove:
        dev = QQuickPointerDevice::genericMouseDevice();
        break;
    case QEvent::TouchBegin:
    case QEvent::TouchUpdate:
    case QEvent::TouchEnd:
    case QEvent::TouchCancel:
        dev = QQuickPointerDevice::touchDevice(static_cast<QTouchEvent *>(event)->device());
        break;
    // TODO tablet event types
    default:
        break;
    }
    Q_ASSERT(dev);
    return dev->pointerEvent()->reset(event);
}

void QQuickWindowPrivate::deliverPointerEvent(QQuickPointerEvent *event)
{
    // If users spin the eventloop as a result of event delivery, we disable
    // event compression and send events directly. This is because we consider
    // the usecase a bit evil, but we at least don't want to lose events.
    ++pointerEventRecursionGuard;

    if (event->asPointerMouseEvent()) {
        deliverMouseEvent(event->asPointerMouseEvent());
    } else if (event->asPointerTouchEvent()) {
        deliverTouchEvent(event->asPointerTouchEvent());
    } else {
        Q_ASSERT(false);
    }

    event->reset(nullptr);

    --pointerEventRecursionGuard;
}

// check if item or any of its child items contain the point
// FIXME: should this be iterative instead of recursive?
QVector<QQuickItem *> QQuickWindowPrivate::pointerTargets(QQuickItem *item, const QPointF &scenePos, bool checkMouseButtons) const
{
    QVector<QQuickItem *> targets;
    auto itemPrivate = QQuickItemPrivate::get(item);
    QPointF itemPos = item->mapFromScene(scenePos);
    // if the item clips, we can potentially return early
    if (itemPrivate->flags & QQuickItem::ItemClipsChildrenToShape) {
        if (!item->contains(itemPos))
            return targets;
    }

    // recurse for children
    QList<QQuickItem *> children = itemPrivate->paintOrderChildItems();
    for (int ii = children.count() - 1; ii >= 0; --ii) {
        QQuickItem *child = children.at(ii);
        auto childPrivate = QQuickItemPrivate::get(child);
        if (!child->isVisible() || !child->isEnabled() || childPrivate->culled)
            continue;
        targets << pointerTargets(child, scenePos, false);
    }

    if (item->contains(itemPos) && (!checkMouseButtons || itemPrivate->acceptedMouseButtons())) {
        // add this item last - children take precedence
        targets << item;
    }
    return targets;
}

// return the joined lists
// list1 has priority, common items come last
QVector<QQuickItem *> QQuickWindowPrivate::mergePointerTargets(const QVector<QQuickItem *> &list1, const QVector<QQuickItem *> &list2) const
{
    QVector<QQuickItem *> targets = list1;
    // start at the end of list2
    // if item not in list, append it
    // if item found, move to next one, inserting before the last found one
    int insertPosition = targets.length();
    for (int i = list2.length() - 1; i >= 0; --i) {
        int newInsertPosition = targets.lastIndexOf(list2.at(i), insertPosition);
        if (newInsertPosition >= 0) {
            Q_ASSERT(newInsertPosition <= insertPosition);
            insertPosition = newInsertPosition;
        }
        // check for duplicates, only insert if the item isn't there already
        if (insertPosition == targets.size() || list2.at(i) != targets.at(insertPosition))
            targets.insert(insertPosition, list2.at(i));
    }
    return targets;
}

void QQuickWindowPrivate::deliverTouchEvent(QQuickPointerTouchEvent *event)
{
    qCDebug(DBG_TOUCH) << " - delivering" << event->asTouchEvent();

    QSet<QQuickItem *> hasFiltered;
    if (event->isPressEvent())
        deliverPressEvent(event, &hasFiltered);
    if (!event->allPointsAccepted())
        deliverUpdatedTouchPoints(event, &hasFiltered);

    // Remove released points from itemForTouchPointId
    bool allReleased = true;
    int pointCount = event->pointCount();
    for (int i = 0; i < pointCount; ++i) {
        QQuickEventPoint *point = event->point(i);
        if (point->state() == QQuickEventPoint::Released) {
            int id = point->pointId();
            qCDebug(DBG_TOUCH_TARGET) << "TP" << id << "released";
            point->setGrabber(nullptr);
            if (id == touchMouseId) {
                touchMouseId = -1;
                touchMouseDevice = nullptr;
            }
        } else {
            allReleased = false;
        }
    }

    if (allReleased && !event->grabbers().isEmpty()) {
        qWarning() << "No release received for some grabbers" << event->grabbers();
        event->clearGrabbers();
    }
}

// Deliver touch points to existing grabbers
bool QQuickWindowPrivate::deliverUpdatedTouchPoints(QQuickPointerTouchEvent *event, QSet<QQuickItem *> *hasFiltered)
{
    const auto grabbers = event->grabbers();
    for (auto grabber : grabbers)
        deliverMatchingPointsToItem(grabber, event, hasFiltered);

    return false;
}

// Deliver newly pressed touch points
bool QQuickWindowPrivate::deliverPressEvent(QQuickPointerEvent *event, QSet<QQuickItem *> *hasFiltered)
{
    const QVector<QPointF> points = event->unacceptedPressedPointScenePositions();
    QVector<QQuickItem *> targetItems;
    for (QPointF point: points) {
        QVector<QQuickItem *> targetItemsForPoint = pointerTargets(contentItem, point, false);
        if (targetItems.count()) {
            targetItems = mergePointerTargets(targetItems, targetItemsForPoint);
        } else {
            targetItems = targetItemsForPoint;
        }
    }

    for (QQuickItem *item: targetItems) {
        deliverMatchingPointsToItem(item, event, hasFiltered);
        if (event->allPointsAccepted())
            break;
    }

    return event->allPointsAccepted();
}

bool QQuickWindowPrivate::deliverMatchingPointsToItem(QQuickItem *item, QQuickPointerEvent *pointerEvent, QSet<QQuickItem *> *hasFiltered)
{
    Q_Q(QQuickWindow);

    // TODO: unite this mouse point delivery with the synthetic mouse event below
    if (auto event = pointerEvent->asPointerMouseEvent()) {
        if (item->acceptedMouseButtons() & event->button()) {
            auto point = event->point(0);
            if (point->isAccepted())
                return false;

            // The only reason to already have a mouse grabber here is
            // synthetic events - flickable sends one when setPressDelay is used.
            auto oldMouseGrabber = q->mouseGrabberItem();
            QPointF localPos = item->mapFromScene(point->scenePos());
            Q_ASSERT(item->contains(localPos)); // transform is checked already
            QMouseEvent *me = event->asMouseEvent(localPos);
            me->accept();
            q->sendEvent(item, me);
            if (me->isAccepted()) {
                auto mouseGrabber = q->mouseGrabberItem();
                if (mouseGrabber && mouseGrabber != item && mouseGrabber != oldMouseGrabber) {
                    item->mouseUngrabEvent();
                } else {
                    item->grabMouse();
                }
                point->setAccepted(true);
            }
            return me->isAccepted();
        }
        return false;
    }

    QQuickPointerTouchEvent *event = pointerEvent->asPointerTouchEvent();
    if (!event)
        return false;

    QScopedPointer<QTouchEvent> touchEvent(event->touchEventForItem(item));
    if (!touchEvent)
        return false;

    qCDebug(DBG_TOUCH) << " - considering delivering " << touchEvent.data() << " to " << item;
    bool eventAccepted = false;

    // First check whether the parent wants to be a filter,
    // and if the parent accepts the event we are done.
    if (sendFilteredTouchEvent(item->parentItem(), item, event, hasFiltered)) {
        // If the touch was accepted (regardless by whom or in what form),
        // update acceptedNewPoints
        qCDebug(DBG_TOUCH) << " - can't. intercepted " << touchEvent.data() << " to " << item->parentItem() << " instead of " << item;
        for (auto point: qAsConst(touchEvent->touchPoints())) {
            event->pointById(point.id())->setAccepted();
        }
        return true;
    }

    // Deliver the touch event to the given item
    qCDebug(DBG_TOUCH) << " - actually delivering " << touchEvent.data() << " to " << item;
    QCoreApplication::sendEvent(item, touchEvent.data());
    eventAccepted = touchEvent->isAccepted();

    // If the touch event wasn't accepted, synthesize a mouse event and see if the item wants it.
    QQuickItemPrivate *itemPrivate = QQuickItemPrivate::get(item);
    if (!eventAccepted && (itemPrivate->acceptedMouseButtons() & Qt::LeftButton)) {
        //  send mouse event
        if (deliverTouchAsMouse(item, event))
            eventAccepted = true;
    }

    if (eventAccepted) {
        // If the touch was accepted (regardless by whom or in what form),
        // update accepted new points.
        for (auto point: qAsConst(touchEvent->touchPoints())) {
            auto pointerEventPoint = event->pointById(point.id());
            pointerEventPoint->setAccepted();
            if (point.state() == Qt::TouchPointPressed)
                pointerEventPoint->setGrabber(item);
        }
    } else {
        // But if the event was not accepted then we know this item
        // will not be interested in further updates for those touchpoint IDs either.
        for (auto point: qAsConst(touchEvent->touchPoints())) {
            if (point.state() == Qt::TouchPointPressed) {
                if (event->pointById(point.id())->grabber() == item) {
                    qCDebug(DBG_TOUCH_TARGET) << "TP" << point.id() << "disassociated";
                    event->pointById(point.id())->setGrabber(nullptr);
                }
            }
        }
    }

    return eventAccepted;
}

#ifndef QT_NO_DRAGANDDROP
void QQuickWindowPrivate::deliverDragEvent(QQuickDragGrabber *grabber, QEvent *event)
{
    grabber->resetTarget();
    QQuickDragGrabber::iterator grabItem = grabber->begin();
    if (grabItem != grabber->end()) {
        Q_ASSERT(event->type() != QEvent::DragEnter);
        if (event->type() == QEvent::Drop) {
            QDropEvent *e = static_cast<QDropEvent *>(event);
            for (e->setAccepted(false); !e->isAccepted() && grabItem != grabber->end(); grabItem = grabber->release(grabItem)) {
                QPointF p = (**grabItem)->mapFromScene(e->pos());
                QDropEvent translatedEvent(
                        p.toPoint(),
                        e->possibleActions(),
                        e->mimeData(),
                        e->mouseButtons(),
                        e->keyboardModifiers());
                QQuickDropEventEx::copyActions(&translatedEvent, *e);
                QCoreApplication::sendEvent(**grabItem, &translatedEvent);
                e->setAccepted(translatedEvent.isAccepted());
                e->setDropAction(translatedEvent.dropAction());
                grabber->setTarget(**grabItem);
            }
        }
        if (event->type() != QEvent::DragMove) {    // Either an accepted drop or a leave.
            QDragLeaveEvent leaveEvent;
            for (; grabItem != grabber->end(); grabItem = grabber->release(grabItem))
                QCoreApplication::sendEvent(**grabItem, &leaveEvent);
            return;
        } else for (; grabItem != grabber->end(); grabItem = grabber->release(grabItem)) {
            QDragMoveEvent *moveEvent = static_cast<QDragMoveEvent *>(event);
            if (deliverDragEvent(grabber, **grabItem, moveEvent)) {
                moveEvent->setAccepted(true);
                for (++grabItem; grabItem != grabber->end();) {
                    QPointF p = (**grabItem)->mapFromScene(moveEvent->pos());
                    if ((**grabItem)->contains(p)) {
                        QDragMoveEvent translatedEvent(
                                p.toPoint(),
                                moveEvent->possibleActions(),
                                moveEvent->mimeData(),
                                moveEvent->mouseButtons(),
                                moveEvent->keyboardModifiers());
                        QQuickDropEventEx::copyActions(&translatedEvent, *moveEvent);
                        QCoreApplication::sendEvent(**grabItem, &translatedEvent);
                        ++grabItem;
                    } else {
                        QDragLeaveEvent leaveEvent;
                        QCoreApplication::sendEvent(**grabItem, &leaveEvent);
                        grabItem = grabber->release(grabItem);
                    }
                }
                return;
            } else {
                QDragLeaveEvent leaveEvent;
                QCoreApplication::sendEvent(**grabItem, &leaveEvent);
            }
        }
    }
    if (event->type() == QEvent::DragEnter || event->type() == QEvent::DragMove) {
        QDragMoveEvent *e = static_cast<QDragMoveEvent *>(event);
        QDragEnterEvent enterEvent(
                e->pos(),
                e->possibleActions(),
                e->mimeData(),
                e->mouseButtons(),
                e->keyboardModifiers());
        QQuickDropEventEx::copyActions(&enterEvent, *e);
        event->setAccepted(deliverDragEvent(grabber, contentItem, &enterEvent));
    }
}

bool QQuickWindowPrivate::deliverDragEvent(QQuickDragGrabber *grabber, QQuickItem *item, QDragMoveEvent *event)
{
    bool accepted = false;
    QQuickItemPrivate *itemPrivate = QQuickItemPrivate::get(item);
    if (!item->isVisible() || !item->isEnabled() || QQuickItemPrivate::get(item)->culled)
        return false;
    QPointF p = item->mapFromScene(event->pos());
    bool itemContained = item->contains(p);

    if (!itemContained && itemPrivate->flags & QQuickItem::ItemClipsChildrenToShape) {
        return false;
    }

    QDragEnterEvent enterEvent(
            event->pos(),
            event->possibleActions(),
            event->mimeData(),
            event->mouseButtons(),
            event->keyboardModifiers());
    QQuickDropEventEx::copyActions(&enterEvent, *event);
    QList<QQuickItem *> children = itemPrivate->paintOrderChildItems();
    for (int ii = children.count() - 1; ii >= 0; --ii) {
        if (deliverDragEvent(grabber, children.at(ii), &enterEvent))
            return true;
    }

    if (itemContained) {
        if (event->type() == QEvent::DragMove || itemPrivate->flags & QQuickItem::ItemAcceptsDrops) {
            QDragMoveEvent translatedEvent(
                    p.toPoint(),
                    event->possibleActions(),
                    event->mimeData(),
                    event->mouseButtons(),
                    event->keyboardModifiers(),
                    event->type());
            QQuickDropEventEx::copyActions(&translatedEvent, *event);
            QCoreApplication::sendEvent(item, &translatedEvent);
            if (event->type() == QEvent::DragEnter) {
                if (translatedEvent.isAccepted()) {
                    grabber->grab(item);
                    accepted = true;
                }
            } else {
                accepted = true;
            }
        }
    }

    return accepted;
}
#endif // QT_NO_DRAGANDDROP

#ifndef QT_NO_CURSOR
void QQuickWindowPrivate::updateCursor(const QPointF &scenePos)
{
    Q_Q(QQuickWindow);

    QQuickItem *oldCursorItem = cursorItem;
    cursorItem = findCursorItem(contentItem, scenePos);

    if (cursorItem != oldCursorItem) {
        QWindow *renderWindow = QQuickRenderControl::renderWindowFor(q);
        QWindow *window = renderWindow ? renderWindow : q;
        if (cursorItem)
            window->setCursor(cursorItem->cursor());
        else
            window->unsetCursor();
    }
}

QQuickItem *QQuickWindowPrivate::findCursorItem(QQuickItem *item, const QPointF &scenePos)
{
    QQuickItemPrivate *itemPrivate = QQuickItemPrivate::get(item);
    if (itemPrivate->flags & QQuickItem::ItemClipsChildrenToShape) {
        QPointF p = item->mapFromScene(scenePos);
        if (!item->contains(p))
            return 0;
    }

    if (itemPrivate->subtreeCursorEnabled) {
        QList<QQuickItem *> children = itemPrivate->paintOrderChildItems();
        for (int ii = children.count() - 1; ii >= 0; --ii) {
            QQuickItem *child = children.at(ii);
            if (!child->isVisible() || !child->isEnabled() || QQuickItemPrivate::get(child)->culled)
                continue;
            if (QQuickItem *cursorItem = findCursorItem(child, scenePos))
                return cursorItem;
        }
    }

    if (itemPrivate->hasCursor) {
        QPointF p = item->mapFromScene(scenePos);
        if (item->contains(p))
            return item;
    }
    return 0;
}
#endif

bool QQuickWindowPrivate::sendFilteredTouchEvent(QQuickItem *target, QQuickItem *item, QQuickPointerTouchEvent *event, QSet<QQuickItem *> *hasFiltered)
{
    Q_Q(QQuickWindow);

    if (!target)
        return false;

    bool filtered = false;

    QQuickItemPrivate *targetPrivate = QQuickItemPrivate::get(target);
    if (targetPrivate->filtersChildMouseEvents && !hasFiltered->contains(target)) {
        hasFiltered->insert(target);
        QScopedPointer<QTouchEvent> targetEvent(event->touchEventForItem(target, true));
        if (targetEvent) {
            if (target->childMouseEventFilter(item, targetEvent.data())) {
                qCDebug(DBG_TOUCH) << " - first chance intercepted on childMouseEventFilter by " << target;
                QVector<int> touchIds;
                const int touchPointCount = targetEvent->touchPoints().size();
                touchIds.reserve(touchPointCount);
                for (int i = 0; i < touchPointCount; ++i)
                    touchIds.append(targetEvent->touchPoints().at(i).id());
                target->grabTouchPoints(touchIds);
                if (q->mouseGrabberItem()) {
                    q->mouseGrabberItem()->ungrabMouse();
                    touchMouseId = -1;
                    touchMouseDevice = nullptr;
                }
                filtered = true;
            }

            for (int i = 0; i < targetEvent->touchPoints().size(); ++i) {
                const QTouchEvent::TouchPoint &tp = targetEvent->touchPoints().at(i);

                QEvent::Type t;
                switch (tp.state()) {
                case Qt::TouchPointPressed:
                    t = QEvent::MouseButtonPress;
                    break;
                case Qt::TouchPointReleased:
                    t = QEvent::MouseButtonRelease;
                    break;
                case Qt::TouchPointStationary:
                    continue;
                default:
                    t = QEvent::MouseMove;
                    break;
                }

                // Only deliver mouse event if it is the touchMouseId or it could become the touchMouseId
                if (touchMouseId == -1 || touchMouseId == tp.id()) {
                    // targetEvent is already transformed wrt local position, velocity, etc.

                    // FIXME: remove asTouchEvent!!!
                    QScopedPointer<QMouseEvent> mouseEvent(touchToMouseEvent(t, tp, event->asTouchEvent(), item, false));
                    if (target->childMouseEventFilter(item, mouseEvent.data())) {
                        qCDebug(DBG_TOUCH) << " - second chance intercepted on childMouseEventFilter by " << target;
                        if (t != QEvent::MouseButtonRelease) {
                            qCDebug(DBG_TOUCH_TARGET) << "TP" << tp.id() << "->" << target;
                            touchMouseId = tp.id();
                            touchMouseDevice = event->device();
                            touchMouseDevice->pointerEvent()->pointById(tp.id())->setGrabber(target);
                            target->grabMouse();
                        }
                        filtered = true;
                    }
                    // Only one event can be filtered as a mouse event.
                    break;
                }
            }
        }
    }

    return sendFilteredTouchEvent(target->parentItem(), item, event, hasFiltered) || filtered;
}

bool QQuickWindowPrivate::sendFilteredMouseEvent(QQuickItem *target, QQuickItem *item, QEvent *event, QSet<QQuickItem *> *hasFiltered)
{
    if (!target)
        return false;

    QQuickItemPrivate *targetPrivate = QQuickItemPrivate::get(target);
    if (targetPrivate->replayingPressEvent)
        return false;

    bool filtered = false;
    if (targetPrivate->filtersChildMouseEvents && !hasFiltered->contains(target)) {
        hasFiltered->insert(target);
        if (target->childMouseEventFilter(item, event))
            filtered = true;
        qCDebug(DBG_MOUSE_TARGET) << target << "childMouseEventFilter ->" << filtered;
    }

    return sendFilteredMouseEvent(target->parentItem(), item, event, hasFiltered) || filtered;
}

bool QQuickWindowPrivate::dragOverThreshold(qreal d, Qt::Axis axis, QMouseEvent *event, int startDragThreshold)
{
    QStyleHints *styleHints = QGuiApplication::styleHints();
    int caps = QGuiApplicationPrivate::mouseEventCaps(event);
    bool dragVelocityLimitAvailable = (caps & QTouchDevice::Velocity)
        && styleHints->startDragVelocity();
    bool overThreshold = qAbs(d) > (startDragThreshold >= 0 ? startDragThreshold : styleHints->startDragDistance());
    if (dragVelocityLimitAvailable) {
        QVector2D velocityVec = QGuiApplicationPrivate::mouseEventVelocity(event);
        qreal velocity = axis == Qt::XAxis ? velocityVec.x() : velocityVec.y();
        overThreshold |= qAbs(velocity) > styleHints->startDragVelocity();
    }
    return overThreshold;
}

bool QQuickWindowPrivate::dragOverThreshold(qreal d, Qt::Axis axis, const QTouchEvent::TouchPoint *tp, int startDragThreshold)
{
    QStyleHints *styleHints = qApp->styleHints();
    bool overThreshold = qAbs(d) > (startDragThreshold >= 0 ? startDragThreshold : styleHints->startDragDistance());
    qreal velocity = axis == Qt::XAxis ? tp->velocity().x() : tp->velocity().y();
    overThreshold |= qAbs(velocity) > styleHints->startDragVelocity();
    return overThreshold;
}

/*!
    \qmlproperty list<Object> Window::data
    \default

    The data property allows you to freely mix visual children, resources
    and other Windows in a Window.

    If you assign another Window to the data list, the nested window will
    become "transient for" the outer Window.

    If you assign an \l Item to the data list, it becomes a child of the
    Window's \l contentItem, so that it appears inside the window. The item's
    parent will be the window's contentItem, which is the root of the Item
    ownership tree within that Window.

    If you assign any other object type, it is added as a resource.

    It should not generally be necessary to refer to the \c data property,
    as it is the default property for Window and thus all child items are
    automatically assigned to this property.

    \sa QWindow::transientParent()
 */

void QQuickWindowPrivate::data_append(QQmlListProperty<QObject> *property, QObject *o)
{
    if (!o)
        return;
    QQuickWindow *that = static_cast<QQuickWindow *>(property->object);
    if (QQuickWindow *window = qmlobject_cast<QQuickWindow *>(o))
        window->setTransientParent(that);
    QQmlListProperty<QObject> itemProperty = QQuickItemPrivate::get(that->contentItem())->data();
    itemProperty.append(&itemProperty, o);
}

int QQuickWindowPrivate::data_count(QQmlListProperty<QObject> *property)
{
    QQuickWindow *win = static_cast<QQuickWindow*>(property->object);
    if (!win || !win->contentItem() || !QQuickItemPrivate::get(win->contentItem())->data().count)
        return 0;
    QQmlListProperty<QObject> itemProperty = QQuickItemPrivate::get(win->contentItem())->data();
    return itemProperty.count(&itemProperty);
}

QObject *QQuickWindowPrivate::data_at(QQmlListProperty<QObject> *property, int i)
{
    QQuickWindow *win = static_cast<QQuickWindow*>(property->object);
    QQmlListProperty<QObject> itemProperty = QQuickItemPrivate::get(win->contentItem())->data();
    return itemProperty.at(&itemProperty, i);
}

void QQuickWindowPrivate::data_clear(QQmlListProperty<QObject> *property)
{
    QQuickWindow *win = static_cast<QQuickWindow*>(property->object);
    QQmlListProperty<QObject> itemProperty = QQuickItemPrivate::get(win->contentItem())->data();
    itemProperty.clear(&itemProperty);
}

bool QQuickWindowPrivate::isRenderable() const
{
    Q_Q(const QQuickWindow);
    return ((q->isExposed() && q->isVisible())) && q->geometry().isValid();
}

void QQuickWindowPrivate::contextCreationFailureMessage(const QSurfaceFormat &format,
                                                        QString *translatedMessage,
                                                        QString *untranslatedMessage,
                                                        bool isEs)
{
    const QString contextType = QLatin1String(isEs ? "EGL" : "OpenGL");
    QString formatStr;
    QDebug(&formatStr) << format;
#if defined(Q_OS_WIN32)
    const bool isDebug = QLibraryInfo::isDebugBuild();
    const QString eglLibName = QLatin1String(isDebug ? "libEGLd.dll" : "libEGL.dll");
    const QString glesLibName = QLatin1String(isDebug ? "libGLESv2d.dll" : "libGLESv2.dll");
     //: %1 Context type (Open GL, EGL), %2 format, ANGLE %3, %4 library names
    const char msg[] = QT_TRANSLATE_NOOP("QQuickWindow",
        "Failed to create %1 context for format %2.\n"
        "This is most likely caused by not having the necessary graphics drivers installed.\n\n"
        "Install a driver providing OpenGL 2.0 or higher, or, if this is not possible, "
        "make sure the ANGLE Open GL ES 2.0 emulation libraries (%3, %4 and d3dcompiler_*.dll) "
        "are available in the application executable's directory or in a location listed in PATH.");
    *translatedMessage = QQuickWindow::tr(msg).arg(contextType, formatStr, eglLibName, glesLibName);
    *untranslatedMessage = QString::fromLatin1(msg).arg(contextType, formatStr, eglLibName, glesLibName);
#else // Q_OS_WIN32
    //: %1 Context type (Open GL, EGL), %2 format specification
    const char msg[] = QT_TRANSLATE_NOOP("QQuickWindow",
                                         "Failed to create %1 context for format %2");
    *translatedMessage = QQuickWindow::tr(msg).arg(contextType, formatStr);
    *untranslatedMessage = QString::fromLatin1(msg).arg(contextType, formatStr);
#endif // !Q_OS_WIN32
}

/*!
    Propagates an event \a e to a QQuickItem \a item on the window.

    Use \l QCoreApplication::sendEvent() directly instead.

    The return value is currently not used.

    \deprecated
*/
// ### Qt6: remove
bool QQuickWindow::sendEvent(QQuickItem *item, QEvent *e)
{
    Q_D(QQuickWindow);

    if (!item) {
        qWarning("QQuickWindow::sendEvent: Cannot send event to a null item");
        return false;
    }

    Q_ASSERT(e);

    switch (e->type()) {
    case QEvent::KeyPress:
    case QEvent::KeyRelease:
        e->accept();
        QCoreApplication::sendEvent(item, e);
        while (!e->isAccepted() && (item = item->parentItem())) {
            e->accept();
            QCoreApplication::sendEvent(item, e);
        }
        break;
    case QEvent::MouseButtonPress:
    case QEvent::MouseButtonRelease:
    case QEvent::MouseButtonDblClick:
    case QEvent::MouseMove: {
            // XXX todo - should sendEvent be doing this?  how does it relate to forwarded events?
            QSet<QQuickItem *> hasFiltered;
            if (!d->sendFilteredMouseEvent(item->parentItem(), item, e, &hasFiltered)) {
                // accept because qml items by default accept and have to explicitly opt out of accepting
                e->accept();
                QCoreApplication::sendEvent(item, e);
            }
        }
        break;
    default:
        QCoreApplication::sendEvent(item, e);
        break;
    }

    return false;
}

void QQuickWindowPrivate::cleanupNodes()
{
    for (int ii = 0; ii < cleanupNodeList.count(); ++ii)
        delete cleanupNodeList.at(ii);
    cleanupNodeList.clear();
}

void QQuickWindowPrivate::cleanupNodesOnShutdown(QQuickItem *item)
{
    QQuickItemPrivate *p = QQuickItemPrivate::get(item);
    if (p->itemNodeInstance) {
        delete p->itemNodeInstance;
        p->itemNodeInstance = 0;

        if (p->extra.isAllocated()) {
            p->extra->opacityNode = 0;
            p->extra->clipNode = 0;
            p->extra->rootNode = 0;
        }

        p->paintNode = 0;

        p->dirty(QQuickItemPrivate::Window);
    }

    // Qt 6: Make invalidateSceneGraph a virtual member of QQuickItem
    if (p->flags & QQuickItem::ItemHasContents) {
        const QMetaObject *mo = item->metaObject();
        int index = mo->indexOfSlot("invalidateSceneGraph()");
        if (index >= 0) {
            const QMetaMethod &method = mo->method(index);
            // Skip functions named invalidateSceneGraph() in QML items.
            if (strstr(method.enclosingMetaObject()->className(), "_QML_") == 0)
                method.invoke(item, Qt::DirectConnection);
        }
    }

    for (int ii = 0; ii < p->childItems.count(); ++ii)
        cleanupNodesOnShutdown(p->childItems.at(ii));
}

// This must be called from the render thread, with the main thread frozen
void QQuickWindowPrivate::cleanupNodesOnShutdown()
{
    Q_Q(QQuickWindow);
    cleanupNodes();
    cleanupNodesOnShutdown(contentItem);
    for (QSet<QQuickItem *>::const_iterator it = parentlessItems.begin(), cend = parentlessItems.end(); it != cend; ++it)
        cleanupNodesOnShutdown(*it);
    animationController->windowNodesDestroyed();
    q->cleanupSceneGraph();
}

void QQuickWindowPrivate::updateDirtyNodes()
{
    qCDebug(DBG_DIRTY) << "QQuickWindowPrivate::updateDirtyNodes():";

    cleanupNodes();

    QQuickItem *updateList = dirtyItemList;
    dirtyItemList = 0;
    if (updateList) QQuickItemPrivate::get(updateList)->prevDirtyItem = &updateList;

    while (updateList) {
        QQuickItem *item = updateList;
        QQuickItemPrivate *itemPriv = QQuickItemPrivate::get(item);
        itemPriv->removeFromDirtyList();

        qCDebug(DBG_DIRTY) << "   QSGNode:" << item << qPrintable(itemPriv->dirtyToString());
        updateDirtyNode(item);
    }
}

static inline QSGNode *qquickitem_before_paintNode(QQuickItemPrivate *d)
{
    const QList<QQuickItem *> childItems = d->paintOrderChildItems();
    QQuickItem *before = 0;
    for (int i=0; i<childItems.size(); ++i) {
        QQuickItemPrivate *dd = QQuickItemPrivate::get(childItems.at(i));
        // Perform the same check as the in fetchNextNode below.
        if (dd->z() < 0 && (dd->explicitVisible || (dd->extra.isAllocated() && dd->extra->effectRefCount)))
            before = childItems.at(i);
        else
            break;
    }
    return Q_UNLIKELY(before) ? QQuickItemPrivate::get(before)->itemNode() : 0;
}

static QSGNode *fetchNextNode(QQuickItemPrivate *itemPriv, int &ii, bool &returnedPaintNode)
{
    QList<QQuickItem *> orderedChildren = itemPriv->paintOrderChildItems();

    for (; ii < orderedChildren.count() && orderedChildren.at(ii)->z() < 0; ++ii) {
        QQuickItemPrivate *childPrivate = QQuickItemPrivate::get(orderedChildren.at(ii));
        if (!childPrivate->explicitVisible &&
            (!childPrivate->extra.isAllocated() || !childPrivate->extra->effectRefCount))
            continue;

        ii++;
        return childPrivate->itemNode();
    }

    if (itemPriv->paintNode && !returnedPaintNode) {
        returnedPaintNode = true;
        return itemPriv->paintNode;
    }

    for (; ii < orderedChildren.count(); ++ii) {
        QQuickItemPrivate *childPrivate = QQuickItemPrivate::get(orderedChildren.at(ii));
        if (!childPrivate->explicitVisible &&
            (!childPrivate->extra.isAllocated() || !childPrivate->extra->effectRefCount))
            continue;

        ii++;
        return childPrivate->itemNode();
    }

    return 0;
}

void QQuickWindowPrivate::updateDirtyNode(QQuickItem *item)
{
    QQuickItemPrivate *itemPriv = QQuickItemPrivate::get(item);
    quint32 dirty = itemPriv->dirtyAttributes;
    itemPriv->dirtyAttributes = 0;

    if ((dirty & QQuickItemPrivate::TransformUpdateMask) ||
        (dirty & QQuickItemPrivate::Size && itemPriv->origin() != QQuickItem::TopLeft &&
         (itemPriv->scale() != 1. || itemPriv->rotation() != 0.))) {

        QMatrix4x4 matrix;

        if (itemPriv->x != 0. || itemPriv->y != 0.)
            matrix.translate(itemPriv->x, itemPriv->y);

        for (int ii = itemPriv->transforms.count() - 1; ii >= 0; --ii)
            itemPriv->transforms.at(ii)->applyTo(&matrix);

        if (itemPriv->scale() != 1. || itemPriv->rotation() != 0.) {
            QPointF origin = item->transformOriginPoint();
            matrix.translate(origin.x(), origin.y());
            if (itemPriv->scale() != 1.)
                matrix.scale(itemPriv->scale(), itemPriv->scale());
            if (itemPriv->rotation() != 0.)
                matrix.rotate(itemPriv->rotation(), 0, 0, 1);
            matrix.translate(-origin.x(), -origin.y());
        }

        itemPriv->itemNode()->setMatrix(matrix);
    }

    bool clipEffectivelyChanged = (dirty & (QQuickItemPrivate::Clip | QQuickItemPrivate::Window)) &&
                                  ((item->clip() == false) != (itemPriv->clipNode() == 0));
    int effectRefCount = itemPriv->extra.isAllocated()?itemPriv->extra->effectRefCount:0;
    bool effectRefEffectivelyChanged = (dirty & (QQuickItemPrivate::EffectReference | QQuickItemPrivate::Window)) &&
                                  ((effectRefCount == 0) != (itemPriv->rootNode() == 0));

    if (clipEffectivelyChanged) {
        QSGNode *parent = itemPriv->opacityNode() ? (QSGNode *) itemPriv->opacityNode() :
                                                    (QSGNode *) itemPriv->itemNode();
        QSGNode *child = itemPriv->rootNode();

        if (item->clip()) {
            Q_ASSERT(itemPriv->clipNode() == 0);
            QQuickDefaultClipNode *clip = new QQuickDefaultClipNode(item->clipRect());
            itemPriv->extra.value().clipNode = clip;
            clip->update();

            if (!child) {
                parent->reparentChildNodesTo(clip);
                parent->appendChildNode(clip);
            } else {
                parent->removeChildNode(child);
                clip->appendChildNode(child);
                parent->appendChildNode(clip);
            }

        } else {
            QQuickDefaultClipNode *clip = itemPriv->clipNode();
            Q_ASSERT(clip);
            parent->removeChildNode(clip);
            if (child) {
                clip->removeChildNode(child);
                parent->appendChildNode(child);
            } else {
                clip->reparentChildNodesTo(parent);
            }

            delete itemPriv->clipNode();
            itemPriv->extra->clipNode = 0;
        }
    }

    if (effectRefEffectivelyChanged) {
        if (dirty & QQuickItemPrivate::ChildrenUpdateMask)
            itemPriv->childContainerNode()->removeAllChildNodes();

        QSGNode *parent = itemPriv->clipNode();
        if (!parent)
            parent = itemPriv->opacityNode();
        if (!parent)
            parent = itemPriv->itemNode();

        if (itemPriv->extra.isAllocated() && itemPriv->extra->effectRefCount) {
            Q_ASSERT(itemPriv->rootNode() == 0);
            QSGRootNode *root = new QSGRootNode();
            itemPriv->extra->rootNode = root;
            parent->reparentChildNodesTo(root);
            parent->appendChildNode(root);
        } else {
            Q_ASSERT(itemPriv->rootNode() != 0);
            QSGRootNode *root = itemPriv->rootNode();
            parent->removeChildNode(root);
            root->reparentChildNodesTo(parent);
            delete itemPriv->rootNode();
            itemPriv->extra->rootNode = 0;
        }
    }

    if (dirty & QQuickItemPrivate::ChildrenUpdateMask) {
        int ii = 0;
        bool fetchedPaintNode = false;
        QList<QQuickItem *> orderedChildren = itemPriv->paintOrderChildItems();
        int desiredNodesSize = orderedChildren.size() + (itemPriv->paintNode ? 1 : 0);

        // now start making current state match the promised land of
        // desiredNodes. in the case of our current state matching desiredNodes
        // (though why would we get ChildrenUpdateMask with no changes?) then we
        // should make no changes at all.

        // how many nodes did we process, when examining changes
        int desiredNodesProcessed = 0;

        // currentNode is how far, in our present tree, we have processed. we
        // make use of this later on to trim the current child list if the
        // desired list is shorter.
        QSGNode *groupNode = itemPriv->childContainerNode();
        QSGNode *currentNode = groupNode->firstChild();
        int added = 0;
        int removed = 0;
        int replaced = 0;
        QSGNode *desiredNode = 0;

        while (currentNode && (desiredNode = fetchNextNode(itemPriv, ii, fetchedPaintNode))) {
            // uh oh... reality and our utopic paradise are diverging!
            // we need to reconcile this...
            if (currentNode != desiredNode) {
                // for now, we're just removing the node from the children -
                // and replacing it with the new node.
                if (desiredNode->parent())
                    desiredNode->parent()->removeChildNode(desiredNode);
                groupNode->insertChildNodeAfter(desiredNode, currentNode);
                groupNode->removeChildNode(currentNode);
                replaced++;

                // since we just replaced currentNode, we also need to reset
                // the pointer.
                currentNode = desiredNode;
            }

            currentNode = currentNode->nextSibling();
            desiredNodesProcessed++;
        }

        // if we didn't process as many nodes as in the new list, then we have
        // more nodes at the end of desiredNodes to append to our list.
        // this will be the case when adding new nodes, for instance.
        if (desiredNodesProcessed < desiredNodesSize) {
            while ((desiredNode = fetchNextNode(itemPriv, ii, fetchedPaintNode))) {
                if (desiredNode->parent())
                    desiredNode->parent()->removeChildNode(desiredNode);
                groupNode->appendChildNode(desiredNode);
                added++;
            }
        } else if (currentNode) {
            // on the other hand, if we processed less than our current node
            // tree, then nodes have been _removed_ from the scene, and we need
            // to take care of that here.
            while (currentNode) {
                QSGNode *node = currentNode->nextSibling();
                groupNode->removeChildNode(currentNode);
                currentNode = node;
                removed++;
            }
        }
    }

    if ((dirty & QQuickItemPrivate::Size) && itemPriv->clipNode()) {
        itemPriv->clipNode()->setRect(item->clipRect());
        itemPriv->clipNode()->update();
    }

    if (dirty & (QQuickItemPrivate::OpacityValue | QQuickItemPrivate::Visible
                 | QQuickItemPrivate::HideReference | QQuickItemPrivate::Window))
    {
        qreal opacity = itemPriv->explicitVisible && (!itemPriv->extra.isAllocated() || itemPriv->extra->hideRefCount == 0)
                      ? itemPriv->opacity() : qreal(0);

        if (opacity != 1 && !itemPriv->opacityNode()) {
            QSGOpacityNode *node = new QSGOpacityNode;
            itemPriv->extra.value().opacityNode = node;

            QSGNode *parent = itemPriv->itemNode();
            QSGNode *child = itemPriv->clipNode();
            if (!child)
                child = itemPriv->rootNode();

            if (child) {
                parent->removeChildNode(child);
                node->appendChildNode(child);
                parent->appendChildNode(node);
            } else {
                parent->reparentChildNodesTo(node);
                parent->appendChildNode(node);
            }
        }
        if (itemPriv->opacityNode())
            itemPriv->opacityNode()->setOpacity(opacity);
    }

    if (dirty & QQuickItemPrivate::ContentUpdateMask) {

        if (itemPriv->flags & QQuickItem::ItemHasContents) {
            updatePaintNodeData.transformNode = itemPriv->itemNode();
            itemPriv->paintNode = item->updatePaintNode(itemPriv->paintNode, &updatePaintNodeData);

            Q_ASSERT(itemPriv->paintNode == 0 ||
                     itemPriv->paintNode->parent() == 0 ||
                     itemPriv->paintNode->parent() == itemPriv->childContainerNode());

            if (itemPriv->paintNode && itemPriv->paintNode->parent() == 0) {
                QSGNode *before = qquickitem_before_paintNode(itemPriv);
                if (before)
                    itemPriv->childContainerNode()->insertChildNodeAfter(itemPriv->paintNode, before);
                else
                    itemPriv->childContainerNode()->prependChildNode(itemPriv->paintNode);
            }
        } else if (itemPriv->paintNode) {
            delete itemPriv->paintNode;
            itemPriv->paintNode = 0;
        }
    }

#ifndef QT_NO_DEBUG
    // Check consistency.

    QList<QSGNode *> nodes;
    nodes << itemPriv->itemNodeInstance
          << itemPriv->opacityNode()
          << itemPriv->clipNode()
          << itemPriv->rootNode()
          << itemPriv->paintNode;
    nodes.removeAll(0);

    Q_ASSERT(nodes.constFirst() == itemPriv->itemNodeInstance);
    for (int i=1; i<nodes.size(); ++i) {
        QSGNode *n = nodes.at(i);
        // Failing this means we messed up reparenting
        Q_ASSERT(n->parent() == nodes.at(i-1));
        // Only the paintNode and the one who is childContainer may have more than one child.
        Q_ASSERT(n == itemPriv->paintNode || n == itemPriv->childContainerNode() || n->childCount() == 1);
    }
#endif

}

bool QQuickWindowPrivate::emitError(QQuickWindow::SceneGraphError error, const QString &msg)
{
    Q_Q(QQuickWindow);
    static const QMetaMethod errorSignal = QMetaMethod::fromSignal(&QQuickWindow::sceneGraphError);
    if (q->isSignalConnected(errorSignal)) {
        emit q->sceneGraphError(error, msg);
        return true;
    }
    return false;
}

void QQuickWindow::maybeUpdate()
{
    Q_D(QQuickWindow);
    if (d->renderControl)
        QQuickRenderControlPrivate::get(d->renderControl)->maybeUpdate();
    else if (d->windowManager)
        d->windowManager->maybeUpdate(this);
}

void QQuickWindow::cleanupSceneGraph()
{
    Q_D(QQuickWindow);
#ifndef QT_NO_OPENGL
    delete d->vaoHelper;
    d->vaoHelper = 0;
#endif
    if (!d->renderer)
        return;

    delete d->renderer->rootNode();
    delete d->renderer;
    d->renderer = 0;

    d->runAndClearJobs(&d->beforeSynchronizingJobs);
    d->runAndClearJobs(&d->afterSynchronizingJobs);
    d->runAndClearJobs(&d->beforeRenderingJobs);
    d->runAndClearJobs(&d->afterRenderingJobs);
    d->runAndClearJobs(&d->afterSwapJobs);
}

void QQuickWindow::setTransientParent_helper(QQuickWindow *window)
{
    setTransientParent(window);
    disconnect(sender(), SIGNAL(windowChanged(QQuickWindow*)),
               this, SLOT(setTransientParent_helper(QQuickWindow*)));
}

/*!
    Returns the OpenGL context used for rendering.

    If the scene graph is not ready, or the scene graph is not using OpenGL,
    this function will return null.

    \note If using a scene graph adaptation other than OpenGL this
    function will return nullptr.

    \sa sceneGraphInitialized(), sceneGraphInvalidated()
 */

QOpenGLContext *QQuickWindow::openglContext() const
{
#ifndef QT_NO_OPENGL
    Q_D(const QQuickWindow);
    if (d->context && d->context->isValid()) {
        QSGRendererInterface *rif = d->context->sceneGraphContext()->rendererInterface(d->context);
        if (rif && rif->graphicsApi() == QSGRendererInterface::OpenGL) {
            auto openglRenderContext = static_cast<const QSGDefaultRenderContext *>(d->context);
            return openglRenderContext->openglContext();
        }
    }
#endif
    return nullptr;
}

/*!
    Returns true if the scene graph has been initialized; otherwise returns false.
 */
bool QQuickWindow::isSceneGraphInitialized() const
{
    Q_D(const QQuickWindow);
    return d->context != 0 && d->context->isValid();
}

/*!
    \fn void QQuickWindow::frameSwapped()

    This signal is emitted when a frame has been queued for presenting. With
    vertical synchronization enabled the signal is emitted at most once per
    vsync interval in a continuously animating scene.

    This signal will be emitted from the scene graph rendering thread.
*/


/*!
    \fn void QQuickWindow::sceneGraphInitialized()

    This signal is emitted when the scene graph has been initialized.

    This signal will be emitted from the scene graph rendering thread.

 */


/*!
    \fn void QQuickWindow::sceneGraphInvalidated()

    This signal is emitted when the scene graph has been invalidated.

    This signal implies that the graphics rendering context used
    has been invalidated and all user resources tied to that context
    should be released.

    In the case of the default OpenGL adaptation the context of this
    window will be bound when this function is called. The only exception
    is if the native OpenGL has been destroyed outside Qt's control,
    for instance through EGL_CONTEXT_LOST.

    This signal will be emitted from the scene graph rendering thread.
 */

/*!
    \fn void QQuickWindow::sceneGraphError(SceneGraphError error, const QString &message)

    This signal is emitted when an \a error occurred during scene graph initialization.

    Applications should connect to this signal if they wish to handle errors,
    like graphics context creation failures, in a custom way. When no slot is
    connected to the signal, the behavior will be different: Quick will print
    the \a message, or show a message box, and terminate the application.

    This signal will be emitted from the gui thread.

    \since 5.3
 */

/*!
    \class QQuickCloseEvent
    \internal
    \since 5.1

    \inmodule QtQuick

    \brief Notification that a \l QQuickWindow is about to be closed
*/
/*!
    \qmltype CloseEvent
    \instantiates QQuickCloseEvent
    \inqmlmodule QtQuick.Window
    \ingroup qtquick-visual
    \brief Notification that a \l Window is about to be closed
    \since 5.1

    Notification that a window is about to be closed by the windowing system
    (e.g. the user clicked the title bar close button). The CloseEvent contains
    an accepted property which can be set to false to abort closing the window.

    \sa QQuickWindow::closing()
*/

/*!
    \qmlproperty bool CloseEvent::accepted

    This property indicates whether the application will allow the user to
    close the window.  It is true by default.
*/

/*!
    \fn void QQuickWindow::closing(QQuickCloseEvent *close)
    \since 5.1

    This signal is emitted when the window receives the event \a close from
    the windowing system.
*/

/*!
    \qmlsignal QtQuick.Window::Window::closing(CloseEvent close)
    \since 5.1

    This signal is emitted when the user tries to close the window.

    This signal includes a \a close parameter. The \c {close.accepted}
    property is true by default so that the window is allowed to close; but you
    can implement an \c onClosing handler and set \c {close.accepted = false} if
    you need to do something else before the window can be closed.

    The corresponding handler is \c onClosing.
 */

#ifndef QT_NO_OPENGL
/*!
    Sets the render target for this window to be \a fbo.

    The specified fbo must be created in the context of the window
    or one that shares with it.

    \note
    This function only has an effect when using the default OpenGL scene
    graph adaptation.

    \warning
    This function can only be called from the thread doing
    the rendering.
 */

void QQuickWindow::setRenderTarget(QOpenGLFramebufferObject *fbo)
{
    Q_D(QQuickWindow);
    if (d->context && QThread::currentThread() != d->context->thread()) {
        qWarning("QQuickWindow::setRenderThread: Cannot set render target from outside the rendering thread");
        return;
    }

    d->renderTarget = fbo;
    if (fbo) {
        d->renderTargetId = fbo->handle();
        d->renderTargetSize = fbo->size();
    } else {
        d->renderTargetId = 0;
        d->renderTargetSize = QSize();
    }
}
#endif
/*!
    \overload

    Sets the render target for this window to be an FBO with
    \a fboId and \a size.

    The specified FBO must be created in the context of the window
    or one that shares with it.

    \note
    This function only has an effect when using the default OpenGL scene
    graph adaptation.

    \warning
    This function can only be called from the thread doing
    the rendering.
*/

void QQuickWindow::setRenderTarget(uint fboId, const QSize &size)
{
    Q_D(QQuickWindow);
    if (d->context && QThread::currentThread() != d->context->thread()) {
        qWarning("QQuickWindow::setRenderThread: Cannot set render target from outside the rendering thread");
        return;
    }

    d->renderTargetId = fboId;
    d->renderTargetSize = size;

    // Unset any previously set instance...
    d->renderTarget = 0;
}


/*!
    Returns the FBO id of the render target when set; otherwise returns 0.
 */
uint QQuickWindow::renderTargetId() const
{
    Q_D(const QQuickWindow);
    return d->renderTargetId;
}

/*!
    Returns the size of the currently set render target; otherwise returns an empty size.
 */
QSize QQuickWindow::renderTargetSize() const
{
    Q_D(const QQuickWindow);
    return d->renderTargetSize;
}



#ifndef QT_NO_OPENGL
/*!
    Returns the render target for this window.

    The default is to render to the surface of the window, in which
    case the render target is 0.

    \note
    This function will return nullptr when not using the OpenGL scene
    graph adaptation.
 */
QOpenGLFramebufferObject *QQuickWindow::renderTarget() const
{
    Q_D(const QQuickWindow);
    return d->renderTarget;
}
#endif

/*!
    Grabs the contents of the window and returns it as an image.

    It is possible to call the grabWindow() function when the window is not
    visible. This requires that the window is \l{QWindow::create()} {created}
    and has a valid size and that no other QQuickWindow instances are rendering
    in the same process.

    \warning Calling this function will cause performance problems.

    \warning This function can only be called from the GUI thread.
 */
QImage QQuickWindow::grabWindow()
{
    Q_D(QQuickWindow);

    if (!isVisible() && !d->renderControl) {
        if (d->windowManager && (d->windowManager->flags() & QSGRenderLoop::SupportsGrabWithoutExpose))
            return d->windowManager->grab(this);
    }

#ifndef QT_NO_OPENGL
    if (!isVisible() && !d->renderControl) {
        auto openglRenderContext = static_cast<QSGDefaultRenderContext *>(d->context);
        if (!openglRenderContext->openglContext()) {
            if (!handle() || !size().isValid()) {
                qWarning("QQuickWindow::grabWindow: window must be created and have a valid size");
                return QImage();
            }

            QOpenGLContext context;
            context.setFormat(requestedFormat());
            context.setShareContext(qt_gl_global_share_context());
            context.create();
            context.makeCurrent(this);
            d->context->initialize(&context);

            d->polishItems();
            d->syncSceneGraph();
            d->renderSceneGraph(size());

            bool alpha = format().alphaBufferSize() > 0 && color().alpha() < 255;
            QImage image = qt_gl_read_framebuffer(size() * effectiveDevicePixelRatio(), alpha, alpha);
            d->cleanupNodesOnShutdown();
            d->context->invalidate();
            context.doneCurrent();

            return image;
        }
    }
#endif
    if (d->renderControl)
        return d->renderControl->grab();
    else if (d->windowManager)
        return d->windowManager->grab(this);
    return QImage();
}

/*!
    Returns an incubation controller that splices incubation between frames
    for this window. QQuickView automatically installs this controller for you,
    otherwise you will need to install it yourself using \l{QQmlEngine::setIncubationController()}.

    The controller is owned by the window and will be destroyed when the window
    is deleted.
*/
QQmlIncubationController *QQuickWindow::incubationController() const
{
    Q_D(const QQuickWindow);

    if (!d->windowManager)
        return 0; // TODO: make sure that this is safe

    if (!d->incubationController)
        d->incubationController = new QQuickWindowIncubationController(d->windowManager);
    return d->incubationController;
}



/*!
    \enum QQuickWindow::CreateTextureOption

    The CreateTextureOption enums are used to customize a texture is wrapped.

    \value TextureHasAlphaChannel The texture has an alpha channel and should
    be drawn using blending.

    \value TextureHasMipmaps The texture has mipmaps and can be drawn with
    mipmapping enabled.

    \value TextureOwnsGLTexture The texture object owns the texture id and
    will delete the OpenGL texture when the texture object is deleted.

    \value TextureCanUseAtlas The image can be uploaded into a texture atlas.

    \value TextureIsOpaque The texture will return false for
    QSGTexture::hasAlphaChannel() and will not be blended. This flag was added
    in Qt 5.6.

 */

/*!
    \enum QQuickWindow::SceneGraphError

    This enum describes the error in a sceneGraphError() signal.

    \value ContextNotAvailable graphics context creation failed. This typically means that
    no suitable OpenGL implementation was found, for example because no graphics drivers
    are installed and so no OpenGL 2 support is present. On mobile and embedded boards
    that use OpenGL ES such an error is likely to indicate issues in the windowing system
    integration and possibly an incorrect configuration of Qt.

    \since 5.3
 */

/*!
    \fn void QQuickWindow::beforeSynchronizing()

    This signal is emitted before the scene graph is synchronized with the QML state.

    This signal can be used to do any preparation required before calls to
    QQuickItem::updatePaintNode().

    The OpenGL context used for rendering the scene graph will be bound at this point.

    \warning This signal is emitted from the scene graph rendering thread. If your
    slot function needs to finish before execution continues, you must make sure that
    the connection is direct (see Qt::ConnectionType).

    \warning Make very sure that a signal handler for beforeSynchronizing leaves the GL
    context in the same state as it was when the signal handler was entered. Failing to
    do so can result in the scene not rendering properly.

    \sa resetOpenGLState()
*/

/*!
    \fn void QQuickWindow::afterSynchronizing()

    This signal is emitted after the scene graph is synchronized with the QML state.

    This signal can be used to do preparation required after calls to
    QQuickItem::updatePaintNode(), while the GUI thread is still locked.

    The graphics context used for rendering the scene graph will be bound at this point.

    \warning This signal is emitted from the scene graph rendering thread. If your
    slot function needs to finish before execution continues, you must make sure that
    the connection is direct (see Qt::ConnectionType).

    \warning When using the OpenGL adaptation, make sure that a signal handler for
    afterSynchronizing leaves the OpenGL context in the same state as it was when the
    signal handler was entered. Failing to do so can result in the scene not rendering
    properly.

    \since 5.3
    \sa resetOpenGLState()
 */

/*!
    \fn void QQuickWindow::beforeRendering()

    This signal is emitted before the scene starts rendering.

    Combined with the modes for clearing the background, this option
    can be used to paint using raw OpenGL under QML content.

    The OpenGL context used for rendering the scene graph will be bound
    at this point.

    \warning This signal is emitted from the scene graph rendering thread. If your
    slot function needs to finish before execution continues, you must make sure that
    the connection is direct (see Qt::ConnectionType).

    \warning Make very sure that a signal handler for beforeRendering leaves the OpenGL
    context in the same state as it was when the signal handler was entered. Failing to
    do so can result in the scene not rendering properly.

    \sa resetOpenGLState()
*/

/*!
    \fn void QQuickWindow::afterRendering()

    This signal is emitted after the scene has completed rendering, before swapbuffers is called.

    This signal can be used to paint using raw OpenGL on top of QML content,
    or to do screen scraping of the current frame buffer.

    The OpenGL context used for rendering the scene graph will be bound at this point.

    \warning This signal is emitted from the scene graph rendering thread. If your
    slot function needs to finish before execution continues, you must make sure that
    the connection is direct (see Qt::ConnectionType).

    \warning Make very sure that a signal handler for afterRendering() leaves the OpenGL
    context in the same state as it was when the signal handler was entered. Failing to
    do so can result in the scene not rendering properly.

    \sa resetOpenGLState()
 */

/*!
    \fn void QQuickWindow::afterAnimating()

    This signal is emitted on the gui thread before requesting the render thread to
    perform the synchronization of the scene graph.

    Unlike the other similar signals, this one is emitted on the gui thread instead
    of the render thread. It can be used to synchronize external animation systems
    with the QML content.

    \since 5.3
 */

/*!
    \fn void QQuickWindow::openglContextCreated(QOpenGLContext *context)

    This signal is emitted on the gui thread when the OpenGL \a context
    for this window is created, before it is made current.

    Some implementations will share the same OpenGL context between
    multiple QQuickWindow instances. The openglContextCreated() signal
    will in this case only be emitted for the first window, when the
    OpenGL context is actually created.

    QQuickWindow::openglContext() will still return 0 for this window
    until after the QQuickWindow::sceneGraphInitialize() has been
    emitted.

    \note
    This signal will only be emmited when using the default OpenGL scene
    graph adaptation.

    \since 5.3
 */

/*!
    \fn void QQuickWindow::sceneGraphAboutToStop()

    This signal is emitted on the render thread when the scene graph is
    about to stop rendering. This happens usually because the window
    has been hidden.

    Applications may use this signal to release resources, but should be
    prepared to reinstantiated them again fast. The scene graph and the
    graphics context are not released at this time.

    \warning This signal is emitted from the scene graph rendering thread. If your
    slot function needs to finish before execution continues, you must make sure that
    the connection is direct (see Qt::ConnectionType).

    \warning Make very sure that a signal handler for sceneGraphAboutToStop() leaves the
    graphics context in the same state as it was when the signal handler was entered.
    Failing to do so can result in the scene not rendering properly.

    \sa sceneGraphInvalidated(), resetOpenGLState()
    \since 5.3
 */


/*!
    Sets whether the scene graph rendering of QML should clear the color buffer
    before it starts rendering to \a enabled.

    By disabling clearing of the color buffer, it is possible to render OpengGL content
    under the scene graph.

    The color buffer is cleared by default.

    \sa beforeRendering()
 */

void QQuickWindow::setClearBeforeRendering(bool enabled)
{
    Q_D(QQuickWindow);
    d->clearBeforeRendering = enabled;
}



/*!
    Returns whether clearing of the color buffer is done before rendering or not.
 */

bool QQuickWindow::clearBeforeRendering() const
{
    Q_D(const QQuickWindow);
    return d->clearBeforeRendering;
}

/*!
    \overload
 */

QSGTexture *QQuickWindow::createTextureFromImage(const QImage &image) const
{
    return createTextureFromImage(image, 0);
}


/*!
    Creates a new QSGTexture from the supplied \a image. If the image has an
    alpha channel, the corresponding texture will have an alpha channel.

    The caller of the function is responsible for deleting the returned texture.
    For example whe using the OpenGL adaptation the actual OpenGL texture will
    be deleted when the texture object is deleted.

    When \a options contains TextureCanUseAtlas, the engine may put the image
    into a texture atlas. Textures in an atlas need to rely on
    QSGTexture::normalizedTextureSubRect() for their geometry and will not
    support QSGTexture::Repeat. Other values from CreateTextureOption are
    ignored.

    When \a options contains TextureIsOpaque, the engine will create an RGB
    texture which returns false for QSGTexture::hasAlphaChannel(). Opaque
    textures will in most cases be faster to render. When this flag is not set,
    the texture will have an alpha channel based on the image's format.

    When \a options contains TextureHasMipmaps, the engine will create a
    texture which can use mipmap filtering. Mipmapped textures can not be in
    an atlas.

    When using the OpenGL adaptation, the returned texture will be using
    \c GL_TEXTURE_2D as texture target and \c GL_RGBA as internal format.
    Reimplement QSGTexture to create textures with different parameters.

    \warning This function will return 0 if the scene graph has not yet been
    initialized.

    \warning The returned texture is not memory managed by the scene graph and
    must be explicitly deleted by the caller on the rendering thread.
    This is achieved by deleting the texture from a QSGNode destructor
    or by using deleteLater() in the case where the texture already has affinity
    to the rendering thread.

    This function can be called from any thread.

    \sa sceneGraphInitialized(), QSGTexture
 */

QSGTexture *QQuickWindow::createTextureFromImage(const QImage &image, CreateTextureOptions options) const
{
    Q_D(const QQuickWindow);
    if (!isSceneGraphInitialized()) // check both for d->context and d->context->isValid()
         return 0;
    uint flags = 0;
    if (options & TextureCanUseAtlas)     flags |= QSGRenderContext::CreateTexture_Atlas;
    if (options & TextureHasMipmaps)      flags |= QSGRenderContext::CreateTexture_Mipmap;
    if (!(options & TextureIsOpaque))     flags |= QSGRenderContext::CreateTexture_Alpha;
    return d->context->createTexture(image, flags);
}



/*!
    Creates a new QSGTexture object from an existing OpenGL texture \a id and \a size.

    The caller of the function is responsible for deleting the returned texture.

    The returned texture will be using \c GL_TEXTURE_2D as texture target and
    assumes that internal format is \c {GL_RGBA}. Reimplement QSGTexture to
    create textures with different parameters.

    Use \a options to customize the texture attributes. The TextureUsesAtlas
    option is ignored.

    \warning This function will return null if the scenegraph has not yet been
    initialized or OpenGL is not in use.

    \note This function only has an effect when using the default OpenGL scene graph
    adpation.

    \sa sceneGraphInitialized(), QSGTexture
 */
QSGTexture *QQuickWindow::createTextureFromId(uint id, const QSize &size, CreateTextureOptions options) const
{
#ifndef QT_NO_OPENGL
    if (openglContext()) {
        QSGPlainTexture *texture = new QSGPlainTexture();
        texture->setTextureId(id);
        texture->setHasAlphaChannel(options & TextureHasAlphaChannel);
        texture->setOwnsTexture(options & TextureOwnsGLTexture);
        texture->setTextureSize(size);
        return texture;
    }
#else
    Q_UNUSED(id)
    Q_UNUSED(size)
    Q_UNUSED(options)
#endif
    return 0;
}

/*!
    \qmlproperty color Window::color

    The background color for the window.

    Setting this property is more efficient than using a separate Rectangle.
*/

/*!
    \property QQuickWindow::color
    \brief The color used to clear the OpenGL context.

    Setting the clear color has no effect when clearing is disabled.
    By default, the clear color is white.

    \sa setClearBeforeRendering(), setDefaultAlphaBuffer()
 */

void QQuickWindow::setColor(const QColor &color)
{
    Q_D(QQuickWindow);
    if (color == d->clearColor)
        return;

    if (color.alpha() != d->clearColor.alpha()) {
        QSurfaceFormat fmt = requestedFormat();
        if (color.alpha() < 255)
            fmt.setAlphaBufferSize(8);
        else
            fmt.setAlphaBufferSize(-1);
        setFormat(fmt);
    }
    d->clearColor = color;
    emit colorChanged(color);
    update();
}

QColor QQuickWindow::color() const
{
    return d_func()->clearColor;
}

/*!
    \brief Returns whether to use alpha transparency on newly created windows.

    \since 5.1
    \sa setDefaultAlphaBuffer()
 */
bool QQuickWindow::hasDefaultAlphaBuffer()
{
    return QQuickWindowPrivate::defaultAlphaBuffer;
}

/*!
    \brief \a useAlpha specifies whether to use alpha transparency on newly created windows.
    \since 5.1

    In any application which expects to create translucent windows, it's necessary to set
    this to true before creating the first QQuickWindow. The default value is false.

    \sa hasDefaultAlphaBuffer()
 */
void QQuickWindow::setDefaultAlphaBuffer(bool useAlpha)
{
    QQuickWindowPrivate::defaultAlphaBuffer = useAlpha;
}
#ifndef QT_NO_OPENGL
/*!
    \since 5.2

    Call this function to reset the OpenGL context its default state.

    The scene graph uses the OpenGL context and will both rely on and
    clobber its state. When mixing raw OpenGL commands with scene
    graph rendering, this function provides a convenient way of
    resetting the OpenGL context state back to its default values.

    This function does not touch state in the fixed-function pipeline.

    This function does not clear the color, depth and stencil buffers. Use
    QQuickWindow::setClearBeforeRendering to control clearing of the color
    buffer. The depth and stencil buffer might be clobbered by the scene
    graph renderer. Clear these manually on demand.

    \note This function only has an effect when using the default OpenGL scene graph
    adpation.

    \sa QQuickWindow::beforeRendering()
 */
void QQuickWindow::resetOpenGLState()
{
    if (!openglContext())
        return;

    Q_D(QQuickWindow);

    QOpenGLContext *ctx = openglContext();
    QOpenGLFunctions *gl = ctx->functions();

    gl->glBindBuffer(GL_ARRAY_BUFFER, 0);
    gl->glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);

    if (!d->vaoHelper)
        d->vaoHelper = new QOpenGLVertexArrayObjectHelper(ctx);
    if (d->vaoHelper->isValid())
        d->vaoHelper->glBindVertexArray(0);

    if (ctx->isOpenGLES() || (gl->openGLFeatures() & QOpenGLFunctions::FixedFunctionPipeline)) {
        int maxAttribs;
        gl->glGetIntegerv(GL_MAX_VERTEX_ATTRIBS, &maxAttribs);
        for (int i=0; i<maxAttribs; ++i) {
            gl->glVertexAttribPointer(i, 4, GL_FLOAT, GL_FALSE, 0, 0);
            gl->glDisableVertexAttribArray(i);
        }
    }

    gl->glActiveTexture(GL_TEXTURE0);
    gl->glBindTexture(GL_TEXTURE_2D, 0);

    gl->glDisable(GL_DEPTH_TEST);
    gl->glDisable(GL_STENCIL_TEST);
    gl->glDisable(GL_SCISSOR_TEST);

    gl->glColorMask(true, true, true, true);
    gl->glClearColor(0, 0, 0, 0);

    gl->glDepthMask(true);
    gl->glDepthFunc(GL_LESS);
    gl->glClearDepthf(1);

    gl->glStencilMask(0xff);
    gl->glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
    gl->glStencilFunc(GL_ALWAYS, 0, 0xff);

    gl->glDisable(GL_BLEND);
    gl->glBlendFunc(GL_ONE, GL_ZERO);

    gl->glUseProgram(0);

    QOpenGLFramebufferObject::bindDefault();
}
#endif
/*!
    \qmlproperty string Window::title

    The window's title in the windowing system.

    The window title might appear in the title area of the window decorations,
    depending on the windowing system and the window flags. It might also
    be used by the windowing system to identify the window in other contexts,
    such as in the task switcher.
 */

/*!
    \qmlproperty Qt::WindowModality Window::modality

    The modality of the window.

    A modal window prevents other windows from receiving input events.
    Possible values are Qt.NonModal (the default), Qt.WindowModal,
    and Qt.ApplicationModal.
 */

/*!
    \qmlproperty Qt::WindowFlags Window::flags

    The window flags of the window.

    The window flags control the window's appearance in the windowing system,
    whether it's a dialog, popup, or a regular window, and whether it should
    have a title bar, etc.

    The flags which you read from this property might differ from the ones
    that you set if the requested flags could not be fulfilled.
 */

/*!
    \qmlattachedproperty Window Window::window
    \since 5.7

    This attached property holds the item's window.
    The Window attached property can be attached to any Item.
*/

/*!
    \qmlattachedproperty int Window::width
    \qmlattachedproperty int Window::height
    \since 5.5

    These attached properties hold the size of the item's window.
    The Window attached property can be attached to any Item.
*/

/*!
    \qmlproperty int Window::x
    \qmlproperty int Window::y
    \qmlproperty int Window::width
    \qmlproperty int Window::height

    Defines the window's position and size.

    The (x,y) position is relative to the \l Screen if there is only one,
    or to the virtual desktop (arrangement of multiple screens).

    \qml
    Window { x: 100; y: 100; width: 100; height: 100 }
    \endqml

    \image screen-and-window-dimensions.jpg
 */

/*!
    \qmlproperty int Window::minimumWidth
    \qmlproperty int Window::minimumHeight
    \since 5.1

    Defines the window's minimum size.

    This is a hint to the window manager to prevent resizing below the specified
    width and height.
 */

/*!
    \qmlproperty int Window::maximumWidth
    \qmlproperty int Window::maximumHeight
    \since 5.1

    Defines the window's maximum size.

    This is a hint to the window manager to prevent resizing above the specified
    width and height.
 */

/*!
    \qmlproperty bool Window::visible

    Whether the window is visible on the screen.

    Setting visible to false is the same as setting \l visibility to \l {QWindow::}{Hidden}.

    \sa visibility
 */

/*!
    \qmlproperty QWindow::Visibility Window::visibility

    The screen-occupation state of the window.

    Visibility is whether the window should appear in the windowing system as
    normal, minimized, maximized, fullscreen or hidden.

    To set the visibility to \l {QWindow::}{AutomaticVisibility} means to give the
    window a default visible state, which might be \l {QWindow::}{FullScreen} or
    \l {QWindow::}{Windowed} depending on the platform. However when reading the
    visibility property you will always get the actual state, never
    \c AutomaticVisibility.

    When a window is not visible its visibility is Hidden, and setting
    visibility to \l {QWindow::}{Hidden} is the same as setting \l visible to \c false.

    \sa visible
    \since 5.1
 */

/*!
    \qmlattachedproperty QWindow::Visibility Window::visibility
    \since 5.4

    This attached property holds whether the window is currently shown
    in the windowing system as normal, minimized, maximized, fullscreen or
    hidden. The \c Window attached property can be attached to any Item. If the
    item is not shown in any window, the value will be \l {QWindow::}{Hidden}.

    \sa visible, visibility
*/

/*!
    \qmlproperty Item Window::contentItem
    \readonly
    \brief The invisible root item of the scene.
*/

/*!
    \qmlproperty Qt::ScreenOrientation Window::contentOrientation

    This is a hint to the window manager in case it needs to display
    additional content like popups, dialogs, status bars, or similar
    in relation to the window.

    The recommended orientation is \l {Screen::orientation}{Screen.orientation}, but
    an application doesn't have to support all possible orientations,
    and thus can opt to ignore the current screen orientation.

    The difference between the window and the content orientation
    determines how much to rotate the content by.

    The default value is Qt::PrimaryOrientation.

    \sa Screen

    \since 5.1
 */

/*!
    \qmlproperty real Window::opacity

    The opacity of the window.

    If the windowing system supports window opacity, this can be used to fade the
    window in and out, or to make it semitransparent.

    A value of 1.0 or above is treated as fully opaque, whereas a value of 0.0 or below
    is treated as fully transparent. Values inbetween represent varying levels of
    translucency between the two extremes.

    The default value is 1.0.

    \since 5.1
 */

/*!
    \qmlproperty Item Window::activeFocusItem
    \since 5.1

    The item which currently has active focus or \c null if there is
    no item with active focus.
 */

/*!
    \qmlattachedproperty Item Window::activeFocusItem
    \since 5.4

    This attached property holds the item which currently has active focus or
    \c null if there is no item with active focus. The Window attached property
    can be attached to any Item.
*/

/*!
    \qmlproperty bool Window::active
    \since 5.1

    The active status of the window.

    \sa requestActivate()
 */

/*!
    \qmlattachedproperty bool Window::active
    \since 5.4

    This attached property tells whether the window is active. The Window
    attached property can be attached to any Item.

    Here is an example which changes a label to show the active state of the
    window in which it is shown:

    \qml
    import QtQuick 2.4
    import QtQuick.Window 2.2

    Text {
        text: Window.active ? "active" : "inactive"
    }
    \endqml
*/

/*!
    \qmlmethod QtQuick::Window::requestActivate()
    \since 5.1

    Requests the window to be activated, i.e. receive keyboard focus.
 */

/*!
    \qmlmethod QtQuick::Window::alert(int msec)
    \since 5.1

    Causes an alert to be shown for \a msec milliseconds. If \a msec is \c 0
    (the default), then the alert is shown indefinitely until the window
    becomes active again.

    In alert state, the window indicates that it demands attention, for example
    by flashing or bouncing the taskbar entry.
*/

/*!
    \qmlmethod QtQuick::Window::close()

    Closes the window.

    When this method is called, or when the user tries to close the window by
    its title bar button, the \l closing signal will be emitted. If there is no
    handler, or the handler does not revoke permission to close, the window
    will subsequently close. If the QGuiApplication::quitOnLastWindowClosed
    property is \c true, and there are no other windows open, the application
    will quit.
*/

/*!
    \qmlmethod QtQuick::Window::raise()

    Raises the window in the windowing system.

    Requests that the window be raised to appear above other windows.
*/

/*!
    \qmlmethod QtQuick::Window::lower()

    Lowers the window in the windowing system.

    Requests that the window be lowered to appear below other windows.
*/

/*!
    \qmlmethod QtQuick::Window::show()

    Shows the window.

    This is equivalent to calling showFullScreen(), showMaximized(), or showNormal(),
    depending on the platform's default behavior for the window type and flags.

    \sa showFullScreen(), showMaximized(), showNormal(), hide(), QQuickItem::flags()
*/

/*!
    \qmlmethod QtQuick::Window::hide()

    Hides the window.

    Equivalent to setting \l visible to \c false or \l visibility to \l {QWindow::}{Hidden}.

    \sa show()
*/

/*!
    \qmlmethod QtQuick::Window::showMinimized()

    Shows the window as minimized.

    Equivalent to setting \l visibility to \l {QWindow::}{Minimized}.
*/

/*!
    \qmlmethod QtQuick::Window::showMaximized()

    Shows the window as maximized.

    Equivalent to setting \l visibility to \l {QWindow::}{Maximized}.
*/

/*!
    \qmlmethod QtQuick::Window::showFullScreen()

    Shows the window as fullscreen.

    Equivalent to setting \l visibility to \l {QWindow::}{FullScreen}.
*/

/*!
    \qmlmethod QtQuick::Window::showNormal()

    Shows the window as normal, i.e. neither maximized, minimized, nor fullscreen.

    Equivalent to setting \l visibility to \l {QWindow::}{Windowed}.
*/

/*!
    \enum QQuickWindow::RenderStage
    \since 5.4

    \value BeforeSynchronizingStage Before synchronization.
    \value AfterSynchronizingStage After synchronization.
    \value BeforeRenderingStage Before rendering.
    \value AfterRenderingStage After rendering.
    \value AfterSwapStage After the frame is swapped.
    \value NoStage As soon as possible. This value was added in Qt 5.6.

    \sa {Scene Graph and Rendering}
 */

/*!
    \since 5.4

    Schedules \a job to run when the rendering of this window reaches
    the given \a stage.

    This is a convenience to the equivalent signals in QQuickWindow for
    "one shot" tasks.

    The window takes ownership over \a job and will delete it when the
    job is completed.

    If rendering is shut down before \a job has a chance to run, the
    job will be run and then deleted as part of the scene graph cleanup.
    If the window is never shown and no rendering happens before the QQuickWindow
    is destroyed, all pending jobs will be destroyed without their run()
    method being called.

    If the rendering is happening on a different thread, then the job
    will happen on the rendering thread.

    If \a stage is \l NoStage, \a job will be run at the earliest opportunity
    whenever the render thread is not busy rendering a frame. If there is no
    OpenGL context available or the window is not exposed at the time the job is
    either posted or handled, it is deleted without executing the run() method.
    If a non-threaded renderer is in use, the run() method of the job is executed
    synchronously.
    The OpenGL context is changed to the renderer context before executing a
    \l NoStage job.

    \note This function does not trigger rendering; the jobs targeting any other
    stage than NoStage will be stored run until rendering is triggered elsewhere.
    To force the job to run earlier, call QQuickWindow::update();

    \sa beforeRendering(), afterRendering(), beforeSynchronizing(),
    afterSynchronizing(), frameSwapped(), sceneGraphInvalidated()
 */

void QQuickWindow::scheduleRenderJob(QRunnable *job, RenderStage stage)
{
    Q_D(QQuickWindow);

    d->renderJobMutex.lock();
    if (stage == BeforeSynchronizingStage) {
        d->beforeSynchronizingJobs << job;
    } else if (stage == AfterSynchronizingStage) {
        d->afterSynchronizingJobs << job;
    } else if (stage == BeforeRenderingStage) {
        d->beforeRenderingJobs << job;
    } else if (stage == AfterRenderingStage) {
        d->afterRenderingJobs << job;
    } else if (stage == AfterSwapStage) {
        d->afterSwapJobs << job;
    } else if (stage == NoStage) {
        if (isExposed())
            d->windowManager->postJob(this, job);
        else
            delete job;
    }
    d->renderJobMutex.unlock();
}

void QQuickWindowPrivate::runAndClearJobs(QList<QRunnable *> *jobs)
{
    renderJobMutex.lock();
    QList<QRunnable *> jobList = *jobs;
    jobs->clear();
    renderJobMutex.unlock();

    for (QRunnable *r : qAsConst(jobList)) {
        r->run();
        delete r;
    }
}

void QQuickWindow::runJobsAfterSwap()
{
    Q_D(QQuickWindow);
    d->runAndClearJobs(&d->afterSwapJobs);
}

/*!
 * Returns the device pixel ratio for this window.
 *
 * This is different from QWindow::devicePixelRatio() in that it supports
 * redirected rendering via QQuickRenderControl. When using a
 * QQuickRenderControl, the QQuickWindow is often not created, meaning it is
 * never shown and there is no underlying native window created in the
 * windowing system. As a result, querying properties like the device pixel
 * ratio cannot give correct results. Use this function instead.
 *
 * \sa QWindow::devicePixelRatio()
 */
qreal QQuickWindow::effectiveDevicePixelRatio() const
{
    QWindow *w = QQuickRenderControl::renderWindowFor(const_cast<QQuickWindow *>(this));
    return w ? w->devicePixelRatio() : devicePixelRatio();
}

/*!
    \return the current renderer interface. The value is always valid and is never null.

    \note This function can be called at any time after constructing the
    QQuickWindow, even while isSceneGraphInitialized() is still false. However,
    some renderer interface functions, in particular
    QSGRendererInterface::getResource() will not be functional until the
    scenegraph is up and running. Backend queries, like
    QSGRendererInterface::graphicsApi() or QSGRendererInterface::shaderType(),
    will always be functional on the other hand.

    \note The ownership of the returned pointer stays with Qt. The returned
    instance may or may not be shared between different QQuickWindow instances,
    depending on the scenegraph backend in use. Therefore applications are
    expected to query the interface object for each QQuickWindow instead of
    reusing the already queried pointer.

    \sa QSGRenderNode, QSGRendererInterface

    \since 5.8
 */
QSGRendererInterface *QQuickWindow::rendererInterface() const
{
    Q_D(const QQuickWindow);

    // no context validity check - it is essential to be able to return a
    // renderer interface instance before scenegraphInitialized() is emitted
    // (depending on the backend, that can happen way too late for some of the
    // rif use cases, like examining the graphics api or shading language in
    // use)

    return d->context->sceneGraphContext()->rendererInterface(d->context);
}

/*!
    Requests a Qt Quick scenegraph backend for the specified graphics \a api.
    Backends can either be built-in or be installed in form of dynamically
    loaded plugins.

    \note The call to the function must happen before constructing the first
    QQuickWindow in the application. It cannot be changed afterwards.

    If \a backend is invalid or an error occurs, the default backend (OpenGL or
    software, depending on the Qt configuration) is used.

    \since 5.8
 */
void QQuickWindow::setSceneGraphBackend(QSGRendererInterface::GraphicsApi api)
{
    switch (api) {
    case QSGRendererInterface::Software:
        setSceneGraphBackend(QStringLiteral("software"));
        break;
    case QSGRendererInterface::Direct3D12:
        setSceneGraphBackend(QStringLiteral("d3d12"));
        break;
    default:
        break;
    }
}

/*!
    Requests the specified Qt Quick scenegraph \a backend. Backends can either
    be built-in or be installed in form of dynamically loaded plugins.

    \overload

    \note The call to the function must happen before constructing the first
    QQuickWindow in the application. It cannot be changed afterwards.

    If \a backend is invalid or an error occurs, the default backend (OpenGL or
    software, depending on the Qt configuration) is used.

    \note Calling this function is equivalent to setting the
    \c QT_QUICK_BACKEND or \c QMLSCENE_DEVICE environment variables. However, this
    API is safer to use in applications that spawn other processes as there is
    no need to worry about environment inheritance.

    \since 5.8
 */
void QQuickWindow::setSceneGraphBackend(const QString &backend)
{
    QSGContext::setBackend(backend);
}

/*!
    Creates a simple rectangle node. When the scenegraph is not initialized, the return value is null.

    This is cross-backend alternative to constructing a QSGSimpleRectNode directly.

    \since 5.8
    \sa QSGRectangleNode
 */
QSGRectangleNode *QQuickWindow::createRectangleNode() const
{
    Q_D(const QQuickWindow);
    return isSceneGraphInitialized() ? d->context->sceneGraphContext()->createRectangleNode() : nullptr;
}

/*!
    Creates a simple image node. When the scenegraph is not initialized, the return value is null.

    This is cross-backend alternative to constructing a QSGSimpleTextureNode directly.

    \since 5.8
    \sa QSGImageNode
 */
QSGImageNode *QQuickWindow::createImageNode() const
{
    Q_D(const QQuickWindow);
    return isSceneGraphInitialized() ? d->context->sceneGraphContext()->createImageNode() : nullptr;
}

/*!
    Creates a nine patch node. When the scenegraph is not initialized, the return value is null.

    \since 5.8
 */
QSGNinePatchNode *QQuickWindow::createNinePatchNode() const
{
    Q_D(const QQuickWindow);
    return isSceneGraphInitialized() ? d->context->sceneGraphContext()->createNinePatchNode() : nullptr;
}

#include "moc_qquickwindow.cpp"

QT_END_NAMESPACE