summaryrefslogtreecommitdiffstats
path: root/src/gui/widgets/qcalendarwidget.cpp
blob: 4bafdd07cc4b6c1ec44e697df9df00a6ebdc9799 (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
/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtGui 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 Digia.  For licensing terms and
** conditions see http://qt.digia.com/licensing.  For further information
** use the contact form at http://qt.digia.com/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 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights.  These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qcalendarwidget.h"

#ifndef QT_NO_CALENDARWIDGET

#include <qabstractitemmodel.h>
#include <qitemdelegate.h>
#include <qdatetime.h>
#include <qtableview.h>
#include <qlayout.h>
#include <qevent.h>
#include <qtextformat.h>
#include <qheaderview.h>
#include <private/qwidget_p.h>
#include <qpushbutton.h>
#include <qtoolbutton.h>
#include <qlabel.h>
#include <qspinbox.h>
#include <qmenu.h>
#include <qapplication.h>
#include <qbasictimer.h>
#include <qstylepainter.h>
#include <private/qcalendartextnavigator_p.h>

QT_BEGIN_NAMESPACE

enum {
    RowCount = 6,
    ColumnCount = 7,
    HeaderColumn = 0,
    HeaderRow = 0,
    MinimumDayOffset = 1
};

class QCalendarDateSectionValidator
{
public:

    enum Section {
        NextSection,
        ThisSection,
        PrevSection
    };

    QCalendarDateSectionValidator() {}
    virtual ~QCalendarDateSectionValidator() {}
    virtual Section handleKey(int key) = 0;
    virtual QDate applyToDate(const QDate &date) const = 0;
    virtual void setDate(const QDate &date) = 0;
    virtual QString text() const = 0;
    virtual QString text(const QDate &date, int repeat) const = 0;

    QLocale m_locale;

protected:
    QString highlightString(const QString &str, int pos) const;
private:
};

QString QCalendarDateSectionValidator::highlightString(const QString &str, int pos) const
{
    if (pos == 0)
        return QLatin1String("<b>") + str + QLatin1String("</b>");
    int startPos = str.length() - pos;
    return str.mid(0, startPos) + QLatin1String("<b>") + str.mid(startPos, pos) + QLatin1String("</b>");

}

class QCalendarDayValidator : public QCalendarDateSectionValidator
{

public:
    QCalendarDayValidator();
    virtual Section handleKey(int key);
    virtual QDate applyToDate(const QDate &date) const;
    virtual void setDate(const QDate &date);
    virtual QString text() const;
    virtual QString text(const QDate &date, int repeat) const;
private:
    int m_pos;
    int m_day;
    int m_oldDay;
};

QCalendarDayValidator::QCalendarDayValidator()
    : QCalendarDateSectionValidator(), m_pos(0), m_day(1), m_oldDay(1)
{
}

QCalendarDateSectionValidator::Section QCalendarDayValidator::handleKey(int key)
{
    if (key == Qt::Key_Right || key == Qt::Key_Left) {
        m_pos = 0;
        return QCalendarDateSectionValidator::ThisSection;
    } else if (key == Qt::Key_Up) {
        m_pos = 0;
        ++m_day;
        if (m_day > 31)
            m_day = 1;
        return QCalendarDateSectionValidator::ThisSection;
    } else if (key == Qt::Key_Down) {
        m_pos = 0;
        --m_day;
        if (m_day < 1)
            m_day = 31;
        return QCalendarDateSectionValidator::ThisSection;
    } else if (key == Qt::Key_Back || key == Qt::Key_Backspace) {
        --m_pos;
        if (m_pos < 0)
            m_pos = 1;

        if (m_pos == 0)
            m_day = m_oldDay;
        else
            m_day = m_day / 10;
            //m_day = m_oldDay / 10 * 10 + m_day / 10;

        if (m_pos == 0)
            return QCalendarDateSectionValidator::PrevSection;
        return QCalendarDateSectionValidator::ThisSection;
    }
    if (key < Qt::Key_0 || key > Qt::Key_9)
        return QCalendarDateSectionValidator::ThisSection;
    int pressedKey = key - Qt::Key_0;
    if (m_pos == 0)
        m_day = pressedKey;
    else
        m_day = m_day % 10 * 10 + pressedKey;
    if (m_day > 31)
        m_day = 31;
    ++m_pos;
    if (m_pos > 1) {
        m_pos = 0;
        return QCalendarDateSectionValidator::NextSection;
    }
    return QCalendarDateSectionValidator::ThisSection;
}

QDate QCalendarDayValidator::applyToDate(const QDate &date) const
{
    int day = m_day;
    if (day < 1)
        day = 1;
    else if (day > 31)
        day = 31;
    if (day > date.daysInMonth())
        day = date.daysInMonth();
    return QDate(date.year(), date.month(), day);
}

void QCalendarDayValidator::setDate(const QDate &date)
{
    m_day = m_oldDay = date.day();
    m_pos = 0;
}

QString QCalendarDayValidator::text() const
{
    QString str;
    if (m_day / 10 == 0)
        str += QLatin1Char('0');
    str += QString::number(m_day);
    return highlightString(str, m_pos);
}

QString QCalendarDayValidator::text(const QDate &date, int repeat) const
{
    if (repeat <= 1) {
        return QString::number(date.day());
    } else if (repeat == 2) {
        QString str;
        if (date.day() / 10 == 0)
            str += QLatin1Char('0');
        return str + QString::number(date.day());
    } else if (repeat == 3) {
        return m_locale.dayName(date.dayOfWeek(), QLocale::ShortFormat);
    } else if (repeat >= 4) {
        return m_locale.dayName(date.dayOfWeek(), QLocale::LongFormat);
    }
    return QString();
}

//////////////////////////////////

class QCalendarMonthValidator : public QCalendarDateSectionValidator
{

public:
    QCalendarMonthValidator();
    virtual Section handleKey(int key);
    virtual QDate applyToDate(const QDate &date) const;
    virtual void setDate(const QDate &date);
    virtual QString text() const;
    virtual QString text(const QDate &date, int repeat) const;
private:
    int m_pos;
    int m_month;
    int m_oldMonth;
};

QCalendarMonthValidator::QCalendarMonthValidator()
    : QCalendarDateSectionValidator(), m_pos(0), m_month(1), m_oldMonth(1)
{
}

QCalendarDateSectionValidator::Section QCalendarMonthValidator::handleKey(int key)
{
    if (key == Qt::Key_Right || key == Qt::Key_Left) {
        m_pos = 0;
        return QCalendarDateSectionValidator::ThisSection;
    } else if (key == Qt::Key_Up) {
        m_pos = 0;
        ++m_month;
        if (m_month > 12)
            m_month = 1;
        return QCalendarDateSectionValidator::ThisSection;
    } else if (key == Qt::Key_Down) {
        m_pos = 0;
        --m_month;
        if (m_month < 1)
            m_month = 12;
        return QCalendarDateSectionValidator::ThisSection;
    } else if (key == Qt::Key_Back || key == Qt::Key_Backspace) {
        --m_pos;
        if (m_pos < 0)
            m_pos = 1;

        if (m_pos == 0)
            m_month = m_oldMonth;
        else
            m_month = m_month / 10;
            //m_month = m_oldMonth / 10 * 10 + m_month / 10;

        if (m_pos == 0)
            return QCalendarDateSectionValidator::PrevSection;
        return QCalendarDateSectionValidator::ThisSection;
    }
    if (key < Qt::Key_0 || key > Qt::Key_9)
        return QCalendarDateSectionValidator::ThisSection;
    int pressedKey = key - Qt::Key_0;
    if (m_pos == 0)
        m_month = pressedKey;
    else
        m_month = m_month % 10 * 10 + pressedKey;
    if (m_month > 12)
        m_month = 12;
    ++m_pos;
    if (m_pos > 1) {
        m_pos = 0;
        return QCalendarDateSectionValidator::NextSection;
    }
    return QCalendarDateSectionValidator::ThisSection;
}

QDate QCalendarMonthValidator::applyToDate(const QDate &date) const
{
    int month = m_month;
    if (month < 1)
        month = 1;
    else if (month > 12)
        month = 12;
    QDate newDate(date.year(), m_month, 1);
    int day = date.day();
    if (day > newDate.daysInMonth())
        day = newDate.daysInMonth();
    return QDate(date.year(), month, day);
}

void QCalendarMonthValidator::setDate(const QDate &date)
{
    m_month = m_oldMonth = date.month();
    m_pos = 0;
}

QString QCalendarMonthValidator::text() const
{
    QString str;
    if (m_month / 10 == 0)
        str += QLatin1Char('0');
    str += QString::number(m_month);
    return highlightString(str, m_pos);
}

QString QCalendarMonthValidator::text(const QDate &date, int repeat) const
{
    if (repeat <= 1) {
        return QString::number(date.month());
    } else if (repeat == 2) {
        QString str;
        if (date.month() / 10 == 0)
            str += QLatin1Char('0');
        return str + QString::number(date.month());
    } else if (repeat == 3) {
        return m_locale.standaloneMonthName(date.month(), QLocale::ShortFormat);
    } else /*if (repeat >= 4)*/ {
        return m_locale.standaloneMonthName(date.month(), QLocale::LongFormat);
    }
}

//////////////////////////////////

class QCalendarYearValidator : public QCalendarDateSectionValidator
{

public:
    QCalendarYearValidator();
    virtual Section handleKey(int key);
    virtual QDate applyToDate(const QDate &date) const;
    virtual void setDate(const QDate &date);
    virtual QString text() const;
    virtual QString text(const QDate &date, int repeat) const;
private:
    int pow10(int n);
    int m_pos;
    int m_year;
    int m_oldYear;
};

QCalendarYearValidator::QCalendarYearValidator()
    : QCalendarDateSectionValidator(), m_pos(0), m_year(2000), m_oldYear(2000)
{
}

int QCalendarYearValidator::pow10(int n)
{
    int power = 1;
    for (int i = 0; i < n; i++)
        power *= 10;
    return power;
}

QCalendarDateSectionValidator::Section QCalendarYearValidator::handleKey(int key)
{
    if (key == Qt::Key_Right || key == Qt::Key_Left) {
        m_pos = 0;
        return QCalendarDateSectionValidator::ThisSection;
    } else if (key == Qt::Key_Up) {
        m_pos = 0;
        ++m_year;
        return QCalendarDateSectionValidator::ThisSection;
    } else if (key == Qt::Key_Down) {
        m_pos = 0;
        --m_year;
        return QCalendarDateSectionValidator::ThisSection;
    } else if (key == Qt::Key_Back || key == Qt::Key_Backspace) {
        --m_pos;
        if (m_pos < 0)
            m_pos = 3;

        int pow = pow10(m_pos);
        m_year = m_oldYear / pow * pow + m_year % (pow * 10) / 10;

        if (m_pos == 0)
            return QCalendarDateSectionValidator::PrevSection;
        return QCalendarDateSectionValidator::ThisSection;
    }
    if (key < Qt::Key_0 || key > Qt::Key_9)
        return QCalendarDateSectionValidator::ThisSection;
    int pressedKey = key - Qt::Key_0;
    int pow = pow10(m_pos);
    m_year = m_year / (pow * 10) * (pow * 10) + m_year % pow * 10 + pressedKey;
    ++m_pos;
    if (m_pos > 3) {
        m_pos = 0;
        return QCalendarDateSectionValidator::NextSection;
    }
    return QCalendarDateSectionValidator::ThisSection;
}

QDate QCalendarYearValidator::applyToDate(const QDate &date) const
{
    int year = m_year;
    if (year < 1)
        year = 1;
    QDate newDate(year, date.month(), 1);
    int day = date.day();
    if (day > newDate.daysInMonth())
        day = newDate.daysInMonth();
    return QDate(year, date.month(), day);
}

void QCalendarYearValidator::setDate(const QDate &date)
{
    m_year = m_oldYear = date.year();
    m_pos = 0;
}

QString QCalendarYearValidator::text() const
{
    QString str;
    int pow = 10;
    for (int i = 0; i < 3; i++) {
        if (m_year / pow == 0)
            str += QLatin1Char('0');
        pow *= 10;
    }
    str += QString::number(m_year);
    return highlightString(str, m_pos);
}

QString QCalendarYearValidator::text(const QDate &date, int repeat) const
{
    if (repeat < 4) {
        QString str;
        int year = date.year() % 100;
        if (year / 10 == 0)
            str = QLatin1Char('0');
        return str + QString::number(year);
    }
    return QString::number(date.year());
}

///////////////////////////////////

class QCalendarDateValidator
{
public:
    QCalendarDateValidator();
    ~QCalendarDateValidator();

    void handleKeyEvent(QKeyEvent *keyEvent);
    QString currentText() const;
    QDate currentDate() const { return m_currentDate; }
    void setFormat(const QString &format);
    void setInitialDate(const QDate &date);

    void setLocale(const QLocale &locale);

private:

    struct SectionToken {
        SectionToken(QCalendarDateSectionValidator *val, int rep) : validator(val), repeat(rep) {}
        QCalendarDateSectionValidator *validator;
        int repeat;
    };

    void toNextToken();
    void toPreviousToken();
    void applyToDate();

    int countRepeat(const QString &str, int index) const;
    void clear();

    QStringList m_separators;
    QList<SectionToken *> m_tokens;
    QCalendarDateSectionValidator *m_yearValidator;
    QCalendarDateSectionValidator *m_monthValidator;
    QCalendarDateSectionValidator *m_dayValidator;

    SectionToken *m_currentToken;

    QDate m_initialDate;
    QDate m_currentDate;

    QCalendarDateSectionValidator::Section m_lastSectionMove;
};

QCalendarDateValidator::QCalendarDateValidator()
    : m_currentToken(0), m_lastSectionMove(QCalendarDateSectionValidator::ThisSection)
{
    m_initialDate = m_currentDate = QDate::currentDate();
    m_yearValidator = new QCalendarYearValidator();
    m_monthValidator = new QCalendarMonthValidator();
    m_dayValidator = new QCalendarDayValidator();
}

void QCalendarDateValidator::setLocale(const QLocale &locale)
{
    m_yearValidator->m_locale = locale;
    m_monthValidator->m_locale = locale;
    m_dayValidator->m_locale = locale;
}

QCalendarDateValidator::~QCalendarDateValidator()
{
    delete m_yearValidator;
    delete m_monthValidator;
    delete m_dayValidator;
    clear();
}

// from qdatetime.cpp
int QCalendarDateValidator::countRepeat(const QString &str, int index) const
{
    Q_ASSERT(index >= 0 && index < str.size());
    int count = 1;
    const QChar ch = str.at(index);
    while (index + count < str.size() && str.at(index + count) == ch)
        ++count;
    return count;
}

void QCalendarDateValidator::setInitialDate(const QDate &date)
{
    m_yearValidator->setDate(date);
    m_monthValidator->setDate(date);
    m_dayValidator->setDate(date);
    m_initialDate = date;
    m_currentDate = date;
    m_lastSectionMove = QCalendarDateSectionValidator::ThisSection;
}

QString QCalendarDateValidator::currentText() const
{
    QString str;
    QStringListIterator itSep(m_separators);
    QListIterator<SectionToken *> itTok(m_tokens);
    while (itSep.hasNext()) {
        str += itSep.next();
        if (itTok.hasNext()) {
            SectionToken *token = itTok.next();
            QCalendarDateSectionValidator *validator = token->validator;
            if (m_currentToken == token)
                str += validator->text();
            else
                str += validator->text(m_currentDate, token->repeat);
        }
    }
    return str;
}

void QCalendarDateValidator::clear()
{
    QListIterator<SectionToken *> it(m_tokens);
    while (it.hasNext())
        delete it.next();

    m_tokens.clear();
    m_separators.clear();

    m_currentToken = 0;
}

void QCalendarDateValidator::setFormat(const QString &format)
{
    clear();

    int pos = 0;
    const QLatin1Char quote('\'');
    bool quoting = false;
    QString separator;
    while (pos < format.size()) {
        QString mid = format.mid(pos);
        int offset = 1;

        if (mid.startsWith(quote)) {
            quoting = !quoting;
        } else {
            const QChar nextChar = format.at(pos);
            if (quoting) {
                separator += nextChar;
            } else {
                SectionToken *token = 0;
                if (nextChar == QLatin1Char('d')) {
                    offset = qMin(4, countRepeat(format, pos));
                    token = new SectionToken(m_dayValidator, offset);
                } else if (nextChar == QLatin1Char('M')) {
                    offset = qMin(4, countRepeat(format, pos));
                    token = new SectionToken(m_monthValidator, offset);
                } else if (nextChar == QLatin1Char('y')) {
                    offset = qMin(4, countRepeat(format, pos));
                    token = new SectionToken(m_yearValidator, offset);
                } else {
                    separator += nextChar;
                }
                if (token) {
                    m_tokens.append(token);
                    m_separators.append(separator);
                    separator = QString();
                    if (!m_currentToken)
                        m_currentToken = token;

                }
            }
        }
        pos += offset;
    }
    m_separators += separator;
}

void QCalendarDateValidator::applyToDate()
{
    m_currentDate = m_yearValidator->applyToDate(m_currentDate);
    m_currentDate = m_monthValidator->applyToDate(m_currentDate);
    m_currentDate = m_dayValidator->applyToDate(m_currentDate);
}

void QCalendarDateValidator::toNextToken()
{
    const int idx = m_tokens.indexOf(m_currentToken);
    if (idx == -1)
        return;
    if (idx + 1 >= m_tokens.count())
        m_currentToken = m_tokens.first();
    else
        m_currentToken = m_tokens.at(idx + 1);
}

void QCalendarDateValidator::toPreviousToken()
{
    const int idx = m_tokens.indexOf(m_currentToken);
    if (idx == -1)
        return;
    if (idx - 1 < 0)
        m_currentToken = m_tokens.last();
    else
        m_currentToken = m_tokens.at(idx - 1);
}

void QCalendarDateValidator::handleKeyEvent(QKeyEvent *keyEvent)
{
    if (!m_currentToken)
        return;

    int key = keyEvent->key();
    if (m_lastSectionMove == QCalendarDateSectionValidator::NextSection) {
        if (key == Qt::Key_Back || key == Qt::Key_Backspace)
            toPreviousToken();
    }
    if (key == Qt::Key_Right)
        toNextToken();
    else if (key == Qt::Key_Left)
        toPreviousToken();

    m_lastSectionMove = m_currentToken->validator->handleKey(key);

    applyToDate();
    if (m_lastSectionMove == QCalendarDateSectionValidator::NextSection)
        toNextToken();
    else if (m_lastSectionMove == QCalendarDateSectionValidator::PrevSection)
        toPreviousToken();
}

QWidget *QCalendarTextNavigator::widget() const
{
    return m_widget;
}

void QCalendarTextNavigator::setWidget(QWidget *widget)
{
    m_widget = widget;
}

QDate QCalendarTextNavigator::date() const
{
    return m_date;
}

void QCalendarTextNavigator::setDate(const QDate &date)
{
    m_date = date;
}

void QCalendarTextNavigator::updateDateLabel()
{
    if (!m_widget)
        return;

    m_acceptTimer.start(m_editDelay, this);

    m_dateText->setText(m_dateValidator->currentText());

    QSize s = m_dateFrame->sizeHint();
    QRect r = m_widget->geometry(); // later, just the table section
    QRect newRect((r.width() - s.width()) / 2, (r.height() - s.height()) / 2, s.width(), s.height());
    m_dateFrame->setGeometry(newRect);
    // need to set palette after geometry update as phonestyle sets transparency
    // effect in move event.
    QPalette p = m_dateFrame->palette();
    p.setBrush(QPalette::Window, m_dateFrame->window()->palette().brush(QPalette::Window));
    m_dateFrame->setPalette(p);

    m_dateFrame->raise();
    m_dateFrame->show();
}

void QCalendarTextNavigator::applyDate()
{
    QDate date = m_dateValidator->currentDate();
    if (m_date == date)
        return;

    m_date = date;
    emit dateChanged(date);
}

void QCalendarTextNavigator::createDateLabel()
{
    if (m_dateFrame)
        return;
    m_dateFrame = new QFrame(m_widget);
    QVBoxLayout *vl = new QVBoxLayout;
    m_dateText = new QLabel;
    vl->addWidget(m_dateText);
    m_dateFrame->setLayout(vl);
    m_dateFrame->setFrameShadow(QFrame::Plain);
    m_dateFrame->setFrameShape(QFrame::Box);
    m_dateValidator = new QCalendarDateValidator();
    m_dateValidator->setLocale(m_widget->locale());
    m_dateValidator->setFormat(m_widget->locale().dateFormat(QLocale::ShortFormat));
    m_dateValidator->setInitialDate(m_date);

    m_dateFrame->setAutoFillBackground(true);
    m_dateFrame->setBackgroundRole(QPalette::Window);
}

void QCalendarTextNavigator::removeDateLabel()
{
    if (!m_dateFrame)
        return;
    m_acceptTimer.stop();
    m_dateFrame->hide();
    m_dateFrame->deleteLater();
    delete m_dateValidator;
    m_dateFrame = 0;
    m_dateText = 0;
    m_dateValidator = 0;
}

bool QCalendarTextNavigator::eventFilter(QObject *o, QEvent *e)
{
    if (m_widget) {
        if (e->type() == QEvent::KeyPress || e->type() == QEvent::KeyRelease) {
            QKeyEvent* ke = (QKeyEvent*)e;
            if ((ke->text().length() > 0 && ke->text()[0].isPrint()) || m_dateFrame) {
                if (ke->key() == Qt::Key_Return || ke->key() == Qt::Key_Enter || ke->key() == Qt::Key_Select) {
                    applyDate();
                    emit editingFinished();
                    removeDateLabel();
                } else if (ke->key() == Qt::Key_Escape) {
                    removeDateLabel();
                } else if (e->type() == QEvent::KeyPress) {
                    createDateLabel();
                    m_dateValidator->handleKeyEvent(ke);
                    updateDateLabel();
                }
                ke->accept();
                return true;
            }
            // If we are navigating let the user finish his date in old locate.
            // If we change our mind and want it to update immediately simply uncomment below
            /*
        } else if (e->type() == QEvent::LocaleChange) {
            if (m_dateValidator) {
                m_dateValidator->setLocale(m_widget->locale());
                m_dateValidator->setFormat(m_widget->locale().dateFormat(QLocale::ShortFormat));
                updateDateLabel();
            }
            */
        }
    }
    return QObject::eventFilter(o,e);
}

void QCalendarTextNavigator::timerEvent(QTimerEvent *e)
{
    if (e->timerId() == m_acceptTimer.timerId()) {
        applyDate();
        removeDateLabel();
    }
}

int QCalendarTextNavigator::dateEditAcceptDelay() const
{
    return m_editDelay;
}

void QCalendarTextNavigator::setDateEditAcceptDelay(int delay)
{
    m_editDelay = delay;
}

class QCalendarView;

class QCalendarModel : public QAbstractTableModel
{
    Q_OBJECT
public:
    QCalendarModel(QObject *parent = 0);

    int rowCount(const QModelIndex &) const
        { return RowCount + m_firstRow; }
    int columnCount(const QModelIndex &) const
        { return ColumnCount + m_firstColumn; }
    QVariant data(const QModelIndex &index, int role) const;
    Qt::ItemFlags flags(const QModelIndex &index) const;

    bool insertRows(int row, int count, const QModelIndex &parent = QModelIndex())
    {
        beginInsertRows(parent, row, row + count - 1);
        endInsertRows();
        return true;
    }
    bool insertColumns(int column, int count, const QModelIndex &parent = QModelIndex())
    {
        beginInsertColumns(parent, column, column + count - 1);
        endInsertColumns();
        return true;
    }
    bool removeRows(int row, int count, const QModelIndex &parent = QModelIndex())
    {
        beginRemoveRows(parent, row, row + count - 1);
        endRemoveRows();
        return true;
    }
    bool removeColumns(int column, int count, const QModelIndex &parent = QModelIndex())
    {
        beginRemoveColumns(parent, column, column + count - 1);
        endRemoveColumns();
        return true;
    }

    void showMonth(int year, int month);
    void setDate(const QDate &d);

    void setMinimumDate(const QDate &date);
    void setMaximumDate(const QDate &date);

    void setRange(const QDate &min, const QDate &max);

    void setHorizontalHeaderFormat(QCalendarWidget::HorizontalHeaderFormat format);

    void setFirstColumnDay(Qt::DayOfWeek dayOfWeek);
    Qt::DayOfWeek firstColumnDay() const;

    bool weekNumbersShown() const;
    void setWeekNumbersShown(bool show);

    QTextCharFormat formatForCell(int row, int col) const;
    Qt::DayOfWeek dayOfWeekForColumn(int section) const;
    int columnForDayOfWeek(Qt::DayOfWeek day) const;
    QDate dateForCell(int row, int column) const;
    void cellForDate(const QDate &date, int *row, int *column) const;
    QString dayName(Qt::DayOfWeek day) const;

    void setView(QCalendarView *view)
        { m_view = view; }

    void internalUpdate();
    QDate referenceDate() const;
    int columnForFirstOfMonth(const QDate &date) const;

    int m_firstColumn;
    int m_firstRow;
    QDate m_date;
    QDate m_minimumDate;
    QDate m_maximumDate;
    int m_shownYear;
    int m_shownMonth;
    Qt::DayOfWeek m_firstDay;
    QCalendarWidget::HorizontalHeaderFormat m_horizontalHeaderFormat;
    bool m_weekNumbersShown;
    QMap<Qt::DayOfWeek, QTextCharFormat> m_dayFormats;
    QMap<QDate, QTextCharFormat> m_dateFormats;
    QTextCharFormat m_headerFormat;
    QCalendarView *m_view;
};

class QCalendarView : public QTableView
{
    Q_OBJECT
public:
    QCalendarView(QWidget *parent = 0);

    void internalUpdate() { updateGeometries(); }
    void setReadOnly(bool enable);
    virtual void keyboardSearch(const QString & search) { Q_UNUSED(search) }

signals:
    void showDate(const QDate &date);
    void changeDate(const QDate &date, bool changeMonth);
    void clicked(const QDate &date);
    void editingFinished();
protected:
    QModelIndex moveCursor(CursorAction cursorAction, Qt::KeyboardModifiers modifiers);
    void mouseDoubleClickEvent(QMouseEvent *event);
    void mousePressEvent(QMouseEvent *event);
    void mouseMoveEvent(QMouseEvent *event);
    void mouseReleaseEvent(QMouseEvent *event);
#ifndef QT_NO_WHEELEVENT
    void wheelEvent(QWheelEvent *event);
#endif
    void keyPressEvent(QKeyEvent *event);
    bool event(QEvent *event);

    QDate handleMouseEvent(QMouseEvent *event);
public:
    bool readOnly;
private:
    bool validDateClicked;
#ifdef QT_KEYPAD_NAVIGATION
    QDate origDate;
#endif
};

QCalendarModel::QCalendarModel(QObject *parent)
    : QAbstractTableModel(parent)
{
    m_date = QDate::currentDate();
    m_minimumDate = QDate::fromJulianDay(1);
    m_maximumDate = QDate(7999, 12, 31);
    m_shownYear = m_date.year();
    m_shownMonth = m_date.month();
    m_firstDay = Qt::Sunday;
    m_horizontalHeaderFormat = QCalendarWidget::ShortDayNames;
    m_weekNumbersShown = true;
    m_firstColumn = 1;
    m_firstRow = 1;
    m_view = 0;
}

Qt::DayOfWeek QCalendarModel::dayOfWeekForColumn(int column) const
{
    int col = column - m_firstColumn;
    if (col < 0 || col > 6)
        return Qt::Sunday;
    int day = m_firstDay + col;
    if (day > 7)
        day -= 7;
    return Qt::DayOfWeek(day);
}

int QCalendarModel::columnForDayOfWeek(Qt::DayOfWeek day) const
{
    if (day < 1 || day > 7)
        return -1;
    int column = (int)day - (int)m_firstDay;
    if (column < 0)
        column += 7;
    return column + m_firstColumn;
}

/*
This simple algorithm tries to generate a valid date from the month shown.
Some months don't contain a first day (e.g. Jan of -4713 year,
so QDate (-4713, 1, 1) would be invalid). In that case we try to generate
another valid date for that month. Later, returned date's day is the number of cells
calendar widget will reserve for days before referenceDate. (E.g. if returned date's
day is 16, that day will be placed in 3rd or 4th row, not in the 1st or 2nd row).
Depending on referenceData we can change behaviour of Oct 1582. If referenceDate is 1st
of Oct we render 1 Oct in 1st or 2nd row. If referenceDate is 17 of Oct we show always 16
dates before 17 of Oct, and since this month contains the hole 5-14 Oct, the first of Oct
will be rendered in 2nd or 3rd row, showing more dates from previous month.
*/
QDate QCalendarModel::referenceDate() const
{
    int refDay = 1;
    while (refDay <= 31) {
        QDate refDate(m_shownYear, m_shownMonth, refDay);
        if (refDate.isValid())
            return refDate;
        refDay += 1;
    }
    return QDate();
}

int QCalendarModel::columnForFirstOfMonth(const QDate &date) const
{
    return (columnForDayOfWeek(static_cast<Qt::DayOfWeek>(date.dayOfWeek())) - (date.day() % 7) + 8) % 7;
}

QDate QCalendarModel::dateForCell(int row, int column) const
{
    if (row < m_firstRow || row > m_firstRow + RowCount - 1 ||
                column < m_firstColumn || column > m_firstColumn + ColumnCount - 1)
        return QDate();
    const QDate refDate = referenceDate();
    if (!refDate.isValid())
        return QDate();

    const int columnForFirstOfShownMonth = columnForFirstOfMonth(refDate);
    if (columnForFirstOfShownMonth - m_firstColumn < MinimumDayOffset)
        row -= 1;

    const int requestedDay = 7 * (row - m_firstRow) + column - columnForFirstOfShownMonth - refDate.day() + 1;
    return refDate.addDays(requestedDay);
}

void QCalendarModel::cellForDate(const QDate &date, int *row, int *column) const
{
    if (!row && !column)
        return;

    if (row)
        *row = -1;
    if (column)
        *column = -1;

    const QDate refDate = referenceDate();
    if (!refDate.isValid())
        return;

    const int columnForFirstOfShownMonth = columnForFirstOfMonth(refDate);
    const int requestedPosition = refDate.daysTo(date) - m_firstColumn + columnForFirstOfShownMonth + refDate.day() - 1;

    int c = requestedPosition % 7;
    int r = requestedPosition / 7;
    if (c < 0) {
        c += 7;
        r -= 1;
    }

    if (columnForFirstOfShownMonth - m_firstColumn < MinimumDayOffset)
        r += 1;

    if (r < 0 || r > RowCount - 1 || c < 0 || c > ColumnCount - 1)
        return;

    if (row)
        *row = r + m_firstRow;
    if (column)
        *column = c + m_firstColumn;
}

QString QCalendarModel::dayName(Qt::DayOfWeek day) const
{
    switch (m_horizontalHeaderFormat) {
        case QCalendarWidget::SingleLetterDayNames: {
            QString standaloneDayName = m_view->locale().standaloneDayName(day, QLocale::NarrowFormat);
            if (standaloneDayName == m_view->locale().dayName(day, QLocale::NarrowFormat))
                return standaloneDayName.left(1);
            return standaloneDayName;
        }
        case QCalendarWidget::ShortDayNames:
            return m_view->locale().dayName(day, QLocale::ShortFormat);
        case QCalendarWidget::LongDayNames:
            return m_view->locale().dayName(day, QLocale::LongFormat);
        default:
            break;
    }
    return QString();
}

QTextCharFormat QCalendarModel::formatForCell(int row, int col) const
{
    QPalette pal;
    QPalette::ColorGroup cg = QPalette::Active;
    if (m_view) {
        pal = m_view->palette();
        if (!m_view->isEnabled())
            cg = QPalette::Disabled;
        else if (!m_view->isActiveWindow())
            cg = QPalette::Inactive;
    }

    QTextCharFormat format;
    format.setFont(m_view->font());
    bool header = (m_weekNumbersShown && col == HeaderColumn)
                  || (m_horizontalHeaderFormat != QCalendarWidget::NoHorizontalHeader && row == HeaderRow);
    format.setBackground(pal.brush(cg, header ? QPalette::AlternateBase : QPalette::Base));
    format.setForeground(pal.brush(cg, QPalette::Text));
    if (header) {
        format.merge(m_headerFormat);
    }

    if (col >= m_firstColumn && col < m_firstColumn + ColumnCount) {
        Qt::DayOfWeek dayOfWeek = dayOfWeekForColumn(col);
        if (m_dayFormats.contains(dayOfWeek))
            format.merge(m_dayFormats.value(dayOfWeek));
    }

    if (!header) {
        QDate date = dateForCell(row, col);
        format.merge(m_dateFormats.value(date));
        if(date < m_minimumDate || date > m_maximumDate)
            format.setBackground(pal.brush(cg, QPalette::Window));
        if (m_shownMonth != date.month())
            format.setForeground(pal.brush(QPalette::Disabled, QPalette::Text));
    }
    return format;
}

QVariant QCalendarModel::data(const QModelIndex &index, int role) const
{
    if (role == Qt::TextAlignmentRole)
        return (int) Qt::AlignCenter;

    int row = index.row();
    int column = index.column();

    if(role == Qt::DisplayRole) {
        if (m_weekNumbersShown && column == HeaderColumn
            && row >= m_firstRow && row < m_firstRow + RowCount) {
            QDate date = dateForCell(row, columnForDayOfWeek(Qt::Monday));
            if (date.isValid())
                return date.weekNumber();
        }
        if (m_horizontalHeaderFormat != QCalendarWidget::NoHorizontalHeader && row == HeaderRow
            && column >= m_firstColumn && column < m_firstColumn + ColumnCount)
            return dayName(dayOfWeekForColumn(column));
        QDate date = dateForCell(row, column);
        if (date.isValid())
            return date.day();
        return QString();
    }

    QTextCharFormat fmt = formatForCell(row, column);
    if (role == Qt::BackgroundColorRole)
        return fmt.background().color();
    if (role == Qt::TextColorRole)
        return fmt.foreground().color();
    if (role == Qt::FontRole)
        return fmt.font();
    if (role == Qt::ToolTipRole)
        return fmt.toolTip();
    return QVariant();
}

Qt::ItemFlags QCalendarModel::flags(const QModelIndex &index) const
{
    QDate date = dateForCell(index.row(), index.column());
    if (!date.isValid())
        return QAbstractTableModel::flags(index);
    if (date < m_minimumDate)
        return 0;
    if (date > m_maximumDate)
        return 0;
    return QAbstractTableModel::flags(index);
}

void QCalendarModel::setDate(const QDate &d)
{
    m_date = d;
    if (m_date < m_minimumDate)
        m_date = m_minimumDate;
    else if (m_date > m_maximumDate)
        m_date = m_maximumDate;
}

void QCalendarModel::showMonth(int year, int month)
{
    if (m_shownYear == year && m_shownMonth == month)
        return;

    m_shownYear = year;
    m_shownMonth = month;

    internalUpdate();
}

void QCalendarModel::setMinimumDate(const QDate &d)
{
    if (!d.isValid() || d == m_minimumDate)
        return;

    m_minimumDate = d;
    if (m_maximumDate < m_minimumDate)
        m_maximumDate = m_minimumDate;
    if (m_date < m_minimumDate)
        m_date = m_minimumDate;
    internalUpdate();
}

void QCalendarModel::setMaximumDate(const QDate &d)
{
    if (!d.isValid() || d == m_maximumDate)
        return;

    m_maximumDate = d;
    if (m_minimumDate > m_maximumDate)
        m_minimumDate = m_maximumDate;
    if (m_date > m_maximumDate)
        m_date = m_maximumDate;
    internalUpdate();
}

void QCalendarModel::setRange(const QDate &min, const QDate &max)
{
    m_minimumDate = min;
    m_maximumDate = max;
    if (m_minimumDate > m_maximumDate)
        qSwap(m_minimumDate, m_maximumDate);
    if (m_date < m_minimumDate)
        m_date = m_minimumDate;
    if (m_date > m_maximumDate)
        m_date = m_maximumDate;
    internalUpdate();
}

void QCalendarModel::internalUpdate()
{
    QModelIndex begin = index(0, 0);
    QModelIndex end = index(m_firstRow + RowCount - 1, m_firstColumn + ColumnCount - 1);
    emit dataChanged(begin, end);
    emit headerDataChanged(Qt::Vertical, 0, m_firstRow + RowCount - 1);
    emit headerDataChanged(Qt::Horizontal, 0, m_firstColumn + ColumnCount - 1);
}

void QCalendarModel::setHorizontalHeaderFormat(QCalendarWidget::HorizontalHeaderFormat format)
{
    if (m_horizontalHeaderFormat == format)
        return;

    int oldFormat = m_horizontalHeaderFormat;
    m_horizontalHeaderFormat = format;
    if (oldFormat == QCalendarWidget::NoHorizontalHeader) {
        m_firstRow = 1;
        insertRow(0);
    } else if (m_horizontalHeaderFormat == QCalendarWidget::NoHorizontalHeader) {
        m_firstRow = 0;
        removeRow(0);
    }
    internalUpdate();
}

void QCalendarModel::setFirstColumnDay(Qt::DayOfWeek dayOfWeek)
{
    if (m_firstDay == dayOfWeek)
        return;

    m_firstDay = dayOfWeek;
    internalUpdate();
}

Qt::DayOfWeek QCalendarModel::firstColumnDay() const
{
    return m_firstDay;
}

bool QCalendarModel::weekNumbersShown() const
{
    return m_weekNumbersShown;
}

void QCalendarModel::setWeekNumbersShown(bool show)
{
    if (m_weekNumbersShown == show)
        return;

    m_weekNumbersShown = show;
    if (show) {
        m_firstColumn = 1;
        insertColumn(0);
    } else {
        m_firstColumn = 0;
        removeColumn(0);
    }
    internalUpdate();
}

QCalendarView::QCalendarView(QWidget *parent)
    : QTableView(parent),
    readOnly(false),
    validDateClicked(false)
{
    setTabKeyNavigation(false);
    setShowGrid(false);
    verticalHeader()->setVisible(false);
    horizontalHeader()->setVisible(false);
    setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
    setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
}

QModelIndex QCalendarView::moveCursor(CursorAction cursorAction, Qt::KeyboardModifiers modifiers)
{
    QCalendarModel *calendarModel = qobject_cast<QCalendarModel *>(model());
    if (!calendarModel)
        return QTableView::moveCursor(cursorAction, modifiers);

    if (readOnly)
        return currentIndex();

    QModelIndex index = currentIndex();
    QDate currentDate = static_cast<QCalendarModel*>(model())->dateForCell(index.row(), index.column());
    switch (cursorAction) {
        case QAbstractItemView::MoveUp:
            currentDate = currentDate.addDays(-7);
            break;
        case QAbstractItemView::MoveDown:
            currentDate = currentDate.addDays(7);
            break;
        case QAbstractItemView::MoveLeft:
            currentDate = currentDate.addDays(isRightToLeft() ? 1 : -1);
            break;
        case QAbstractItemView::MoveRight:
            currentDate = currentDate.addDays(isRightToLeft() ? -1 : 1);
            break;
        case QAbstractItemView::MoveHome:
            currentDate = QDate(currentDate.year(), currentDate.month(), 1);
            break;
        case QAbstractItemView::MoveEnd:
            currentDate = QDate(currentDate.year(), currentDate.month(), currentDate.daysInMonth());
            break;
        case QAbstractItemView::MovePageUp:
            currentDate = currentDate.addMonths(-1);
            break;
        case QAbstractItemView::MovePageDown:
            currentDate = currentDate.addMonths(1);
            break;
        case QAbstractItemView::MoveNext:
        case QAbstractItemView::MovePrevious:
            return currentIndex();
        default:
            break;
    }
    emit changeDate(currentDate, true);
    return currentIndex();
}

void QCalendarView::keyPressEvent(QKeyEvent *event)
{
#ifdef QT_KEYPAD_NAVIGATION
    if (event->key() == Qt::Key_Select) {
        if (QApplication::keypadNavigationEnabled()) {
            if (!hasEditFocus()) {
                setEditFocus(true);
                return;
            }
        }
    } else if (event->key() == Qt::Key_Back) {
        if (QApplication::keypadNavigationEnabled() && hasEditFocus()) {
            if (qobject_cast<QCalendarModel *>(model())) {
                emit changeDate(origDate, true); //changes selection back to origDate, but doesn't activate
                setEditFocus(false);
                return;
            }
        }
    }
#endif

    if (!readOnly) {
        switch (event->key()) {
            case Qt::Key_Return:
            case Qt::Key_Enter:
            case Qt::Key_Select:
                emit editingFinished();
                return;
            default:
                break;
        }
    }
    QTableView::keyPressEvent(event);
}

#ifndef QT_NO_WHEELEVENT
void QCalendarView::wheelEvent(QWheelEvent *event)
{
    const int numDegrees = event->delta() / 8;
    const int numSteps = numDegrees / 15;
    const QModelIndex index = currentIndex();
    QDate currentDate = static_cast<QCalendarModel*>(model())->dateForCell(index.row(), index.column());
    currentDate = currentDate.addMonths(-numSteps);
    emit showDate(currentDate);
}
#endif

bool QCalendarView::event(QEvent *event)
{
#ifdef QT_KEYPAD_NAVIGATION
    if (event->type() == QEvent::FocusIn) {
        if (QCalendarModel *calendarModel = qobject_cast<QCalendarModel *>(model())) {
            origDate = calendarModel->m_date;
        }
    }
#endif

    return QTableView::event(event);
}

QDate QCalendarView::handleMouseEvent(QMouseEvent *event)
{
    QCalendarModel *calendarModel = qobject_cast<QCalendarModel *>(model());
    if (!calendarModel)
        return QDate();

    QPoint pos = event->pos();
    QModelIndex index = indexAt(pos);
    QDate date = calendarModel->dateForCell(index.row(), index.column());
    if (date.isValid() && date >= calendarModel->m_minimumDate
            && date <= calendarModel->m_maximumDate) {
        return date;
    }
    return QDate();
}

void QCalendarView::mouseDoubleClickEvent(QMouseEvent *event)
{
    QCalendarModel *calendarModel = qobject_cast<QCalendarModel *>(model());
    if (!calendarModel) {
        QTableView::mouseDoubleClickEvent(event);
        return;
    }

    if (readOnly)
        return;

    QDate date = handleMouseEvent(event);
    validDateClicked = false;
    if (date == calendarModel->m_date && !style()->styleHint(QStyle::SH_ItemView_ActivateItemOnSingleClick)) {
        emit editingFinished();
    }
}

void QCalendarView::mousePressEvent(QMouseEvent *event)
{
    QCalendarModel *calendarModel = qobject_cast<QCalendarModel *>(model());
    if (!calendarModel) {
        QTableView::mousePressEvent(event);
        return;
    }

    if (readOnly)
        return;

    if (event->button() != Qt::LeftButton)
        return;

    QDate date = handleMouseEvent(event);
    if (date.isValid()) {
        validDateClicked = true;
        int row = -1, col = -1;
        static_cast<QCalendarModel *>(model())->cellForDate(date, &row, &col);
        if (row != -1 && col != -1) {
            selectionModel()->setCurrentIndex(model()->index(row, col), QItemSelectionModel::NoUpdate);
        }
    } else {
        validDateClicked = false;
        event->ignore();
    }
}

void QCalendarView::mouseMoveEvent(QMouseEvent *event)
{
    QCalendarModel *calendarModel = qobject_cast<QCalendarModel *>(model());
    if (!calendarModel) {
        QTableView::mouseMoveEvent(event);
        return;
    }

    if (readOnly)
        return;

    if (validDateClicked) {
       QDate date = handleMouseEvent(event);
        if (date.isValid()) {
            int row = -1, col = -1;
            static_cast<QCalendarModel *>(model())->cellForDate(date, &row, &col);
            if (row != -1 && col != -1) {
                selectionModel()->setCurrentIndex(model()->index(row, col), QItemSelectionModel::NoUpdate);
            }
        }
    } else {
        event->ignore();
    }
}

void QCalendarView::mouseReleaseEvent(QMouseEvent *event)
{
    QCalendarModel *calendarModel = qobject_cast<QCalendarModel *>(model());
    if (!calendarModel) {
        QTableView::mouseReleaseEvent(event);
        return;
    }

    if (event->button() != Qt::LeftButton)
        return;

    if (readOnly)
        return;

    if (validDateClicked) {
        QDate date = handleMouseEvent(event);
        if (date.isValid()) {
            emit changeDate(date, true);
            emit clicked(date);
            if (style()->styleHint(QStyle::SH_ItemView_ActivateItemOnSingleClick))
                emit editingFinished();
        }
        validDateClicked = false;
    } else {
        event->ignore();
    }
}

class QCalendarDelegate : public QItemDelegate
{
    Q_OBJECT
public:
    QCalendarDelegate(QCalendarWidgetPrivate *w, QObject *parent = 0)
        : QItemDelegate(parent), calendarWidgetPrivate(w)
            { }
    virtual void paint(QPainter *painter, const QStyleOptionViewItem &option,
                const QModelIndex &index) const;
    void paintCell(QPainter *painter, const QRect &rect, const QDate &date) const;

private:
    QCalendarWidgetPrivate *calendarWidgetPrivate;
    mutable QStyleOptionViewItemV4 storedOption;
};

//Private tool button class
class QCalToolButton: public QToolButton
{
public:
    QCalToolButton(QWidget * parent)
        : QToolButton(parent)
          {  }
protected:
    void paintEvent(QPaintEvent *e)
    {
        Q_UNUSED(e)

#ifndef Q_WS_MAC
        QStyleOptionToolButton opt;
        initStyleOption(&opt);

        if (opt.state & QStyle::State_MouseOver || isDown()) {
            //act as normal button
            setPalette(QPalette());
        } else {
            //set the highlight color for button text
            QPalette toolPalette = palette();
            toolPalette.setColor(QPalette::ButtonText, toolPalette.color(QPalette::HighlightedText));
            setPalette(toolPalette);
        }
#endif
        QToolButton::paintEvent(e);
    }
};

class QPrevNextCalButton : public QToolButton
{
    Q_OBJECT
public:
    QPrevNextCalButton(QWidget *parent) : QToolButton(parent) {}
protected:
    void paintEvent(QPaintEvent *) {
        QStylePainter painter(this);
        QStyleOptionToolButton opt;
        initStyleOption(&opt);
        opt.state &= ~QStyle::State_HasFocus;
        painter.drawComplexControl(QStyle::CC_ToolButton, opt);
    }
};

class QCalendarWidgetPrivate : public QWidgetPrivate
{
    Q_DECLARE_PUBLIC(QCalendarWidget)
public:
    QCalendarWidgetPrivate();

    void showMonth(int year, int month);
    void update();
    void paintCell(QPainter *painter, const QRect &rect, const QDate &date) const;

    void _q_slotShowDate(const QDate &date);
    void _q_slotChangeDate(const QDate &date);
    void _q_slotChangeDate(const QDate &date, bool changeMonth);
    void _q_editingFinished();
    void _q_monthChanged(QAction*);
    void _q_prevMonthClicked();
    void _q_nextMonthClicked();
    void _q_yearEditingFinished();
    void _q_yearClicked();

    void createNavigationBar(QWidget *widget);
    void updateButtonIcons();
    void updateMonthMenu();
    void updateMonthMenuNames();
    void updateNavigationBar();
    void updateCurrentPage(const QDate &newDate);
    inline QDate getCurrentDate();
    void setNavigatorEnabled(bool enable);

    QCalendarModel *m_model;
    QCalendarView *m_view;
    QCalendarDelegate *m_delegate;
    QItemSelectionModel *m_selection;
    QCalendarTextNavigator *m_navigator;
    bool m_dateEditEnabled;

    QToolButton *nextMonth;
    QToolButton *prevMonth;
    QCalToolButton *monthButton;
    QMenu *monthMenu;
    QMap<int, QAction *> monthToAction;
    QCalToolButton *yearButton;
    QSpinBox *yearEdit;
    QWidget *navBarBackground;
    QSpacerItem *spaceHolder;

    bool navBarVisible;
    mutable QSize cachedSizeHint;
    Qt::FocusPolicy oldFocusPolicy;
};

void QCalendarDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option,
            const QModelIndex &index) const
{
    QDate date = calendarWidgetPrivate->m_model->dateForCell(index.row(), index.column());
    if (date.isValid()) {
        storedOption = option;
        QRect rect = option.rect;
        calendarWidgetPrivate->paintCell(painter, rect, date);
    } else {
        QItemDelegate::paint(painter, option, index);
    }
}

void QCalendarDelegate::paintCell(QPainter *painter, const QRect &rect, const QDate &date) const
{
    storedOption.rect = rect;
    int row = -1;
    int col = -1;
    calendarWidgetPrivate->m_model->cellForDate(date, &row, &col);
    QModelIndex idx = calendarWidgetPrivate->m_model->index(row, col);
    QItemDelegate::paint(painter, storedOption, idx);
}

QCalendarWidgetPrivate::QCalendarWidgetPrivate()
    : QWidgetPrivate()
{
    m_model = 0;
    m_view = 0;
    m_delegate = 0;
    m_selection = 0;
    m_navigator = 0;
    m_dateEditEnabled = false;
    navBarVisible = true;
    oldFocusPolicy = Qt::StrongFocus;
}

void QCalendarWidgetPrivate::setNavigatorEnabled(bool enable)
{
    Q_Q(QCalendarWidget);

    bool navigatorEnabled = (m_navigator->widget() != 0);
    if (enable == navigatorEnabled)
        return;

    if (enable) {
        m_navigator->setWidget(q);
        q->connect(m_navigator, SIGNAL(dateChanged(QDate)),
                q, SLOT(_q_slotChangeDate(QDate)));
        q->connect(m_navigator, SIGNAL(editingFinished()),
                q, SLOT(_q_editingFinished()));
        m_view->installEventFilter(m_navigator);
    } else {
        m_navigator->setWidget(0);
        q->disconnect(m_navigator, SIGNAL(dateChanged(QDate)),
                q, SLOT(_q_slotChangeDate(QDate)));
        q->disconnect(m_navigator, SIGNAL(editingFinished()),
                q, SLOT(_q_editingFinished()));
        m_view->removeEventFilter(m_navigator);
    }
}

void QCalendarWidgetPrivate::createNavigationBar(QWidget *widget)
{
    Q_Q(QCalendarWidget);
    navBarBackground = new QWidget(widget);
    navBarBackground->setObjectName(QLatin1String("qt_calendar_navigationbar"));
    navBarBackground->setAutoFillBackground(true);
    navBarBackground->setBackgroundRole(QPalette::Highlight);

    prevMonth = new QPrevNextCalButton(navBarBackground);
    nextMonth = new QPrevNextCalButton(navBarBackground);
    prevMonth->setAutoRaise(true);
    nextMonth->setAutoRaise(true);
    prevMonth->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Minimum);
    nextMonth->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Minimum);
    nextMonth->setAutoRaise(true);
    updateButtonIcons();
    prevMonth->setAutoRepeat(true);
    nextMonth->setAutoRepeat(true);

    monthButton = new QCalToolButton(navBarBackground);
    monthButton->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Minimum);
    monthButton->setAutoRaise(true);
    monthButton->setPopupMode(QToolButton::InstantPopup);
    monthMenu = new QMenu(monthButton);
    for (int i = 1; i <= 12; i++) {
        QString monthName(q->locale().standaloneMonthName(i, QLocale::LongFormat));
        QAction *act = monthMenu->addAction(monthName);
        act->setData(i);
        monthToAction[i] = act;
    }
    monthButton->setMenu(monthMenu);
    yearButton = new QCalToolButton(navBarBackground);
    yearButton->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Minimum);
    yearButton->setAutoRaise(true);
    yearEdit = new QSpinBox(navBarBackground);

    QFont font = q->font();
    font.setBold(true);
    monthButton->setFont(font);
    yearButton->setFont(font);
    yearEdit->setFrame(false);
    yearEdit->setMinimum(m_model->m_minimumDate.year());
    yearEdit->setMaximum(m_model->m_maximumDate.year());
    yearEdit->hide();
    spaceHolder = new QSpacerItem(0,0);

    QHBoxLayout *headerLayout = new QHBoxLayout;
    headerLayout->setMargin(0);
    headerLayout->setSpacing(0);
    headerLayout->addWidget(prevMonth);
    headerLayout->insertStretch(headerLayout->count());
    headerLayout->addWidget(monthButton);
    headerLayout->addItem(spaceHolder);
    headerLayout->addWidget(yearButton);
    headerLayout->insertStretch(headerLayout->count());
    headerLayout->addWidget(nextMonth);
    navBarBackground->setLayout(headerLayout);

    yearEdit->setFocusPolicy(Qt::StrongFocus);
    prevMonth->setFocusPolicy(Qt::NoFocus);
    nextMonth->setFocusPolicy(Qt::NoFocus);
    yearButton->setFocusPolicy(Qt::NoFocus);
    monthButton->setFocusPolicy(Qt::NoFocus);

    //set names for the header controls.
    prevMonth->setObjectName(QLatin1String("qt_calendar_prevmonth"));
    nextMonth->setObjectName(QLatin1String("qt_calendar_nextmonth"));
    monthButton->setObjectName(QLatin1String("qt_calendar_monthbutton"));
    yearButton->setObjectName(QLatin1String("qt_calendar_yearbutton"));
    yearEdit->setObjectName(QLatin1String("qt_calendar_yearedit"));

    updateMonthMenu();
    showMonth(m_model->m_date.year(), m_model->m_date.month());
}

void QCalendarWidgetPrivate::updateButtonIcons()
{
    Q_Q(QCalendarWidget);
    prevMonth->setIcon(q->style()->standardIcon(q->isRightToLeft() ? QStyle::SP_ArrowRight : QStyle::SP_ArrowLeft, 0, q));
    nextMonth->setIcon(q->style()->standardIcon(q->isRightToLeft() ? QStyle::SP_ArrowLeft : QStyle::SP_ArrowRight, 0, q));
}

void QCalendarWidgetPrivate::updateMonthMenu()
{
    int beg = 1, end = 12;
    bool prevEnabled = true;
    bool nextEnabled = true;
    if (m_model->m_shownYear == m_model->m_minimumDate.year()) {
        beg = m_model->m_minimumDate.month();
        if (m_model->m_shownMonth == m_model->m_minimumDate.month())
            prevEnabled = false;
    }
    if (m_model->m_shownYear == m_model->m_maximumDate.year()) {
        end = m_model->m_maximumDate.month();
        if (m_model->m_shownMonth == m_model->m_maximumDate.month())
            nextEnabled = false;
    }
    prevMonth->setEnabled(prevEnabled);
    nextMonth->setEnabled(nextEnabled);
    for (int i = 1; i <= 12; i++) {
        bool monthEnabled = true;
        if (i < beg || i > end)
            monthEnabled = false;
        monthToAction[i]->setEnabled(monthEnabled);
    }
}

void QCalendarWidgetPrivate::updateMonthMenuNames()
{
    Q_Q(QCalendarWidget);

    for (int i = 1; i <= 12; i++) {
        QString monthName(q->locale().standaloneMonthName(i, QLocale::LongFormat));
        monthToAction[i]->setText(monthName);
    }
}

void QCalendarWidgetPrivate::updateCurrentPage(const QDate &date)
{
    Q_Q(QCalendarWidget);

    QDate newDate = date;
    QDate minDate = q->minimumDate();
    QDate maxDate = q->maximumDate();
    if (minDate.isValid()&& minDate.daysTo(newDate) < 0)
        newDate = minDate;
    if (maxDate.isValid()&& maxDate.daysTo(newDate) > 0)
        newDate = maxDate;
    showMonth(newDate.year(), newDate.month());
    int row = -1, col = -1;
    m_model->cellForDate(newDate, &row, &col);
    if (row != -1 && col != -1)
    {
        m_view->selectionModel()->setCurrentIndex(m_model->index(row, col),
                                                  QItemSelectionModel::NoUpdate);
    }
}

void QCalendarWidgetPrivate::_q_monthChanged(QAction *act)
{
    monthButton->setText(act->text());
    QDate currentDate = getCurrentDate();
    QDate newDate = currentDate.addMonths(act->data().toInt()-currentDate.month());
    updateCurrentPage(newDate);
}

QDate QCalendarWidgetPrivate::getCurrentDate()
{
    QModelIndex index = m_view->currentIndex();
    return m_model->dateForCell(index.row(), index.column());
}

void QCalendarWidgetPrivate::_q_prevMonthClicked()
{
    QDate currentDate = getCurrentDate().addMonths(-1);
    updateCurrentPage(currentDate);
}

void QCalendarWidgetPrivate::_q_nextMonthClicked()
{
    QDate currentDate = getCurrentDate().addMonths(1);
    updateCurrentPage(currentDate);
}

void QCalendarWidgetPrivate::_q_yearEditingFinished()
{
    Q_Q(QCalendarWidget);
    yearButton->setText(yearEdit->text());
    yearEdit->hide();
    q->setFocusPolicy(oldFocusPolicy);
    qApp->removeEventFilter(q);
    spaceHolder->changeSize(0, 0);
    yearButton->show();
    QDate currentDate = getCurrentDate();
    currentDate = currentDate.addYears(yearEdit->text().toInt() - currentDate.year());
    updateCurrentPage(currentDate);
}

void QCalendarWidgetPrivate::_q_yearClicked()
{
    Q_Q(QCalendarWidget);
    //show the spinbox on top of the button
    yearEdit->setGeometry(yearButton->x(), yearButton->y(),
                          yearEdit->sizeHint().width(), yearButton->height());
    spaceHolder->changeSize(yearButton->width(), 0);
    yearButton->hide();
    oldFocusPolicy = q->focusPolicy();
    q->setFocusPolicy(Qt::NoFocus);
    yearEdit->show();
    qApp->installEventFilter(q);
    yearEdit->raise();
    yearEdit->selectAll();
    yearEdit->setFocus(Qt::MouseFocusReason);
}

void QCalendarWidgetPrivate::showMonth(int year, int month)
{
    if (m_model->m_shownYear == year && m_model->m_shownMonth == month)
        return;
    Q_Q(QCalendarWidget);
    m_model->showMonth(year, month);
    updateNavigationBar();
    emit q->currentPageChanged(year, month);
    m_view->internalUpdate();
    cachedSizeHint = QSize();
    update();
    updateMonthMenu();
}

void QCalendarWidgetPrivate::updateNavigationBar()
{
    Q_Q(QCalendarWidget);

    QString monthName = q->locale().standaloneMonthName(m_model->m_shownMonth, QLocale::LongFormat);

    monthButton->setText(monthName);
    yearButton->setText(QString::number(m_model->m_shownYear));
    yearEdit->setValue(m_model->m_shownYear);
}

void QCalendarWidgetPrivate::update()
{
    QDate currentDate = m_model->m_date;
    int row, column;
    m_model->cellForDate(currentDate, &row, &column);
    QModelIndex idx;
    m_selection->clear();
    if (row != -1 && column != -1) {
        idx = m_model->index(row, column);
        m_selection->setCurrentIndex(idx, QItemSelectionModel::SelectCurrent);
    }
}

void QCalendarWidgetPrivate::paintCell(QPainter *painter, const QRect &rect, const QDate &date) const
{
    Q_Q(const QCalendarWidget);
    q->paintCell(painter, rect, date);
}

void QCalendarWidgetPrivate::_q_slotShowDate(const QDate &date)
{
    updateCurrentPage(date);
}

void QCalendarWidgetPrivate::_q_slotChangeDate(const QDate &date)
{
    _q_slotChangeDate(date, true);
}

void QCalendarWidgetPrivate::_q_slotChangeDate(const QDate &date, bool changeMonth)
{
    QDate oldDate = m_model->m_date;
    m_model->setDate(date);
    QDate newDate = m_model->m_date;
    if (changeMonth)
        showMonth(newDate.year(), newDate.month());
    if (oldDate != newDate) {
        update();
        Q_Q(QCalendarWidget);
        m_navigator->setDate(newDate);
        emit q->selectionChanged();
    }
}

void QCalendarWidgetPrivate::_q_editingFinished()
{
    Q_Q(QCalendarWidget);
    emit q->activated(m_model->m_date);
}

/*!
    \class QCalendarWidget
    \brief The QCalendarWidget class provides a monthly based
    calendar widget allowing the user to select a date.
    \since 4.2

    \ingroup advanced

    \image cleanlooks-calendarwidget.png

    The widget is initialized with the current month and year, but
    QCalendarWidget provides several public slots to change the year
    and month that is shown.

    By default, today's date is selected, and the user can select a
    date using both mouse and keyboard. The currently selected date
    can be retrieved using the selectedDate() function. It is
    possible to constrain the user selection to a given date range by
    setting the minimumDate and maximumDate properties.
    Alternatively, both properties can be set in one go using the
    setDateRange() convenience slot. Set the \l selectionMode
    property to NoSelection to prohibit the user from selecting at
    all. Note that a date also can be selected programmatically using
    the setSelectedDate() slot.

    The currently displayed month and year can be retrieved using the
    monthShown() and yearShown() functions, respectively.

    A newly created calendar widget uses abbreviated day names, and
    both Saturdays and Sundays are marked in red. The calendar grid is
    not visible. The week numbers are displayed, and the first column
    day is Sunday.

    The notation of the days can be altered to a single letter
    abbreviations ("M" for "Monday") by setting the
    horizontalHeaderFormat property to
    QCalendarWidget::SingleLetterDayNames. Setting the same property
    to QCalendarWidget::LongDayNames makes the header display the
    complete day names. The week numbers can be removed by setting
    the verticalHeaderFormat property to
    QCalendarWidget::NoVerticalHeader.  The calendar grid can be
    turned on by setting the gridVisible property to true using the
    setGridVisible() function:

    \table
    \row \o
        \image qcalendarwidget-grid.png
    \row \o
        \snippet doc/src/snippets/code/src_gui_widgets_qcalendarwidget.cpp 0
    \endtable

    Finally, the day in the first column can be altered using the
    setFirstDayOfWeek() function.

    The QCalendarWidget class also provides three signals,
    selectionChanged(), activated() and currentPageChanged() making it
    possible to respond to user interaction.

    The rendering of the headers, weekdays or single days can be
    largely customized by setting QTextCharFormat's for some special
    weekday, a special date or for the rendering of the headers.

    Only a subset of the properties in QTextCharFormat are used by the
    calendar widget. Currently, the foreground, background and font
    properties are used to determine the rendering of individual cells
    in the widget.

    \sa QDate, QDateEdit, QTextCharFormat
*/

/*!
    \enum QCalendarWidget::SelectionMode

    This enum describes the types of selection offered to the user for
    selecting dates in the calendar.

    \value NoSelection      Dates cannot be selected.
    \value SingleSelection  Single dates can be selected.

    \sa selectionMode
*/

/*!
    Constructs a calendar widget with the given \a parent.

    The widget is initialized with the current month and year, and the
    currently selected date is today.

    \sa setCurrentPage()
*/
QCalendarWidget::QCalendarWidget(QWidget *parent)
    : QWidget(*new QCalendarWidgetPrivate, parent, 0)
{
    Q_D(QCalendarWidget);

    setAutoFillBackground(true);
    setBackgroundRole(QPalette::Window);

    QVBoxLayout *layoutV = new QVBoxLayout(this);
    layoutV->setMargin(0);
    d->m_model = new QCalendarModel(this);
    QTextCharFormat fmt;
    fmt.setForeground(QBrush(Qt::red));
    d->m_model->m_dayFormats.insert(Qt::Saturday, fmt);
    d->m_model->m_dayFormats.insert(Qt::Sunday, fmt);
    d->m_view = new QCalendarView(this);
    d->m_view->setObjectName(QLatin1String("qt_calendar_calendarview"));
    d->m_view->setModel(d->m_model);
    d->m_model->setView(d->m_view);
    d->m_view->setSelectionBehavior(QAbstractItemView::SelectItems);
    d->m_view->setSelectionMode(QAbstractItemView::SingleSelection);
    d->m_view->horizontalHeader()->setResizeMode(QHeaderView::Stretch);
    d->m_view->horizontalHeader()->setClickable(false);
    d->m_view->verticalHeader()->setResizeMode(QHeaderView::Stretch);
    d->m_view->verticalHeader()->setClickable(false);
    d->m_selection = d->m_view->selectionModel();
    d->createNavigationBar(this);
    d->m_view->setFrameStyle(QFrame::NoFrame);
    d->m_delegate = new QCalendarDelegate(d, this);
    d->m_view->setItemDelegate(d->m_delegate);
    d->update();
    d->updateNavigationBar();
    setFocusPolicy(Qt::StrongFocus);
    setFocusProxy(d->m_view);
    setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Preferred);

    connect(d->m_view, SIGNAL(showDate(QDate)),
            this, SLOT(_q_slotShowDate(QDate)));
    connect(d->m_view, SIGNAL(changeDate(QDate,bool)),
            this, SLOT(_q_slotChangeDate(QDate,bool)));
    connect(d->m_view, SIGNAL(clicked(QDate)),
            this, SIGNAL(clicked(QDate)));
    connect(d->m_view, SIGNAL(editingFinished()),
            this, SLOT(_q_editingFinished()));

    connect(d->prevMonth, SIGNAL(clicked(bool)),
            this, SLOT(_q_prevMonthClicked()));
    connect(d->nextMonth, SIGNAL(clicked(bool)),
            this, SLOT(_q_nextMonthClicked()));
    connect(d->yearButton, SIGNAL(clicked(bool)),
            this, SLOT(_q_yearClicked()));
    connect(d->monthMenu, SIGNAL(triggered(QAction*)),
            this, SLOT(_q_monthChanged(QAction*)));
    connect(d->yearEdit, SIGNAL(editingFinished()),
            this, SLOT(_q_yearEditingFinished()));

    layoutV->setMargin(0);
    layoutV->setSpacing(0);
    layoutV->addWidget(d->navBarBackground);
    layoutV->addWidget(d->m_view);

    d->m_navigator = new QCalendarTextNavigator(this);
    setDateEditEnabled(true);
}

/*!
   Destroys the calendar widget.
*/
QCalendarWidget::~QCalendarWidget()
{
}

/*!
   \reimp
*/
QSize QCalendarWidget::sizeHint() const
{
    return minimumSizeHint();
}

/*!
   \reimp
*/
QSize QCalendarWidget::minimumSizeHint() const
{
    Q_D(const QCalendarWidget);
    if (d->cachedSizeHint.isValid())
        return d->cachedSizeHint;

    ensurePolished();

    int w = 0;
    int h = 0;

    int end = 53;
    int rows = 7;
    int cols = 8;

    const int marginH = (style()->pixelMetric(QStyle::PM_FocusFrameHMargin) + 1) * 2;

    if (horizontalHeaderFormat() == QCalendarWidget::NoHorizontalHeader) {
        rows = 6;
    } else {
        for (int i = 1; i <= 7; i++) {
            QFontMetrics fm(d->m_model->formatForCell(0, i).font());
            w = qMax(w, fm.width(d->m_model->dayName(d->m_model->dayOfWeekForColumn(i))) + marginH);
            h = qMax(h, fm.height());
        }
    }

    if (verticalHeaderFormat() == QCalendarWidget::NoVerticalHeader) {
        cols = 7;
    } else {
        for (int i = 1; i <= 6; i++) {
            QFontMetrics fm(d->m_model->formatForCell(i, 0).font());
            for (int j = 1; j < end; j++)
                w = qMax(w, fm.width(QString::number(j)) + marginH);
            h = qMax(h, fm.height());
        }
    }

    QFontMetrics fm(d->m_model->formatForCell(1, 1).font());
    for (int i = 1; i <= end; i++) {
        w = qMax(w, fm.width(QString::number(i)) + marginH);
        h = qMax(h, fm.height());
    }

    if (d->m_view->showGrid()) {
        // hardcoded in tableview
        w += 1;
        h += 1;
    }

    w += 1; // default column span

    h = qMax(h, d->m_view->verticalHeader()->minimumSectionSize());
    w = qMax(w, d->m_view->horizontalHeader()->minimumSectionSize());

    //add the size of the header.
    QSize headerSize(0, 0);
    if (d->navBarVisible) {
        int headerH = d->navBarBackground->sizeHint().height();
        int headerW = 0;

        headerW += d->prevMonth->sizeHint().width();
        headerW += d->nextMonth->sizeHint().width();

        QFontMetrics fm = d->monthButton->fontMetrics();
        int monthW = 0;
        for (int i = 1; i < 12; i++) {
            QString monthName = locale().standaloneMonthName(i, QLocale::LongFormat);
            monthW = qMax(monthW, fm.boundingRect(monthName).width());
        }
        const int buttonDecoMargin = d->monthButton->sizeHint().width() - fm.boundingRect(d->monthButton->text()).width();
        headerW += monthW + buttonDecoMargin;

        fm = d->yearButton->fontMetrics();
        headerW += fm.boundingRect(QLatin1String("5555")).width() + buttonDecoMargin;

        headerSize = QSize(headerW, headerH);
    }
    w *= cols;
    w = qMax(headerSize.width(), w);
    h = (h * rows) + headerSize.height();
    d->cachedSizeHint = QSize(w, h);
    return d->cachedSizeHint;
}

/*!
    Paints the cell specified by the given \a date, using the given \a painter and \a rect.
*/

void QCalendarWidget::paintCell(QPainter *painter, const QRect &rect, const QDate &date) const
{
    Q_D(const QCalendarWidget);
    d->m_delegate->paintCell(painter, rect, date);
}

/*!
    \property QCalendarWidget::selectedDate
    \brief the currently selected date.

    The selected date must be within the date range specified by the
    minimumDate and maximumDate properties. By default, the selected
    date is the current date.

    \sa setDateRange()
*/

QDate QCalendarWidget::selectedDate() const
{
    Q_D(const QCalendarWidget);
    return d->m_model->m_date;
}

void QCalendarWidget::setSelectedDate(const QDate &date)
{
    Q_D(QCalendarWidget);
    if (d->m_model->m_date == date && date == d->getCurrentDate())
        return;

    if (!date.isValid())
        return;

    d->m_model->setDate(date);
    d->update();
    QDate newDate = d->m_model->m_date;
    d->showMonth(newDate.year(), newDate.month());
    emit selectionChanged();
}

/*!
    Returns the year of the currently displayed month. Months are
    numbered from 1 to 12.

    \sa monthShown(), setCurrentPage()
*/

int QCalendarWidget::yearShown() const
{
    Q_D(const QCalendarWidget);
    return d->m_model->m_shownYear;
}

/*!
    Returns the currently displayed month. Months are numbered from 1 to
    12.

    \sa yearShown(), setCurrentPage()
*/

int QCalendarWidget::monthShown() const
{
    Q_D(const QCalendarWidget);
    return d->m_model->m_shownMonth;
}

/*!
    Displays the given \a month of the given \a year without changing
    the selected date. Use the setSelectedDate() function to alter the
    selected date.

    The currently displayed month and year can be retrieved using the
    monthShown() and yearShown() functions respectively.

    \sa yearShown(), monthShown(), showPreviousMonth(), showNextMonth(),
    showPreviousYear(), showNextYear()
*/

void QCalendarWidget::setCurrentPage(int year, int month)
{
    Q_D(QCalendarWidget);
    QDate currentDate = d->getCurrentDate();
    int day = currentDate.day();
    int daysInMonths = QDate(year, month, 1).daysInMonth();
    if (day > daysInMonths)
        day = daysInMonths;

    d->showMonth(year, month);

    QDate newDate(year, month, day);
    int row = -1, col = -1;
    d->m_model->cellForDate(newDate, &row, &col);
    if (row != -1 && col != -1) {
        d->m_view->selectionModel()->setCurrentIndex(d->m_model->index(row, col),
                                                  QItemSelectionModel::NoUpdate);
    }
}

/*!
    Shows the next month relative to the currently displayed
    month. Note that the selected date is not changed.

    \sa showPreviousMonth(), setCurrentPage(), setSelectedDate()
*/

void QCalendarWidget::showNextMonth()
{
    int year = yearShown();
    int month = monthShown();
    if (month == 12) {
        ++year;
        month = 1;
    } else {
        ++month;
    }
    setCurrentPage(year, month);
}

/*!
    Shows the previous month relative to the currently displayed
    month. Note that the selected date is not changed.

    \sa showNextMonth(), setCurrentPage(), setSelectedDate()
*/

void QCalendarWidget::showPreviousMonth()
{
    int year = yearShown();
    int month = monthShown();
    if (month == 1) {
        --year;
        month = 12;
    } else {
        --month;
    }
    setCurrentPage(year, month);
}

/*!
    Shows the currently displayed month in the \e next year relative
    to the currently displayed year. Note that the selected date is
    not changed.

    \sa showPreviousYear(), setCurrentPage(), setSelectedDate()
*/

void QCalendarWidget::showNextYear()
{
    int year = yearShown();
    int month = monthShown();
    ++year;
    setCurrentPage(year, month);
}

/*!
    Shows the currently displayed month in the \e previous year
    relative to the currently displayed year. Note that the selected
    date is not changed.

    \sa showNextYear(), setCurrentPage(), setSelectedDate()
*/

void QCalendarWidget::showPreviousYear()
{
    int year = yearShown();
    int month = monthShown();
    --year;
    setCurrentPage(year, month);
}

/*!
    Shows the month of the selected date.

    \sa selectedDate(), setCurrentPage()
*/
void QCalendarWidget::showSelectedDate()
{
    QDate currentDate = selectedDate();
    setCurrentPage(currentDate.year(), currentDate.month());
}

/*!
    Shows the month of the today's date.

    \sa selectedDate(), setCurrentPage()
*/
void QCalendarWidget::showToday()
{
    QDate currentDate = QDate::currentDate();
    setCurrentPage(currentDate.year(), currentDate.month());
}

/*!
    \property QCalendarWidget::minimumDate
    \brief the minimum date of the currently specified date range.

    The user will not be able to select a date that is before the
    currently set minimum date.

    \table
    \row
    \o \image qcalendarwidget-minimum.png
    \row
    \o
    \snippet doc/src/snippets/code/src_gui_widgets_qcalendarwidget.cpp 1
    \endtable

    By default, the minimum date is the earliest date that the QDate
    class can handle.

    When setting a minimum date, the maximumDate and selectedDate
    properties are adjusted if the selection range becomes invalid. If
    the provided date is not a valid QDate object, the
    setMinimumDate() function does nothing.

    \sa setDateRange()
*/

QDate QCalendarWidget::minimumDate() const
{
    Q_D(const QCalendarWidget);
    return d->m_model->m_minimumDate;
}

void QCalendarWidget::setMinimumDate(const QDate &date)
{
    Q_D(QCalendarWidget);
    if (!date.isValid() || d->m_model->m_minimumDate == date)
        return;

    QDate oldDate = d->m_model->m_date;
    d->m_model->setMinimumDate(date);
    d->yearEdit->setMinimum(d->m_model->m_minimumDate.year());
    d->updateMonthMenu();
    QDate newDate = d->m_model->m_date;
    if (oldDate != newDate) {
        d->update();
        d->showMonth(newDate.year(), newDate.month());
        d->m_navigator->setDate(newDate);
        emit selectionChanged();
    }
}

/*!
    \property QCalendarWidget::maximumDate
    \brief the maximum date of the currently specified date range.

    The user will not be able to select a date which is after the
    currently set maximum date.

    \table
    \row
    \o \image qcalendarwidget-maximum.png
    \row
    \o
    \snippet doc/src/snippets/code/src_gui_widgets_qcalendarwidget.cpp 2
    \endtable

    By default, the maximum date is the last day the QDate class can
    handle.

    When setting a maximum date, the minimumDate and selectedDate
    properties are adjusted if the selection range becomes invalid. If
    the provided date is not a valid QDate object, the
    setMaximumDate() function does nothing.

    \sa setDateRange()
*/

QDate QCalendarWidget::maximumDate() const
{
    Q_D(const QCalendarWidget);
    return d->m_model->m_maximumDate;
}

void QCalendarWidget::setMaximumDate(const QDate &date)
{
    Q_D(QCalendarWidget);
    if (!date.isValid() || d->m_model->m_maximumDate == date)
        return;

    QDate oldDate = d->m_model->m_date;
    d->m_model->setMaximumDate(date);
    d->yearEdit->setMaximum(d->m_model->m_maximumDate.year());
    d->updateMonthMenu();
    QDate newDate = d->m_model->m_date;
    if (oldDate != newDate) {
        d->update();
        d->showMonth(newDate.year(), newDate.month());
        d->m_navigator->setDate(newDate);
        emit selectionChanged();
    }
}

/*!
    Defines a date range by setting the minimumDate and maximumDate
    properties.

    The date range restricts the user selection, i.e. the user can
    only select dates within the specified date range. Note that

    \snippet doc/src/snippets/code/src_gui_widgets_qcalendarwidget.cpp 3

    is analogous to

    \snippet doc/src/snippets/code/src_gui_widgets_qcalendarwidget.cpp 4

    If either the \a min or \a max parameters are not valid QDate
    objects, this function does nothing.

    \sa setMinimumDate(), setMaximumDate()
*/

void QCalendarWidget::setDateRange(const QDate &min, const QDate &max)
{
    Q_D(QCalendarWidget);
    if (d->m_model->m_minimumDate == min && d->m_model->m_maximumDate == max)
        return;
    if (!min.isValid() || !max.isValid())
        return;

    QDate oldDate = d->m_model->m_date;
    d->m_model->setRange(min, max);
    d->yearEdit->setMinimum(d->m_model->m_minimumDate.year());
    d->yearEdit->setMaximum(d->m_model->m_maximumDate.year());
    d->updateMonthMenu();
    QDate newDate = d->m_model->m_date;
    if (oldDate != newDate) {
        d->update();
        d->showMonth(newDate.year(), newDate.month());
        d->m_navigator->setDate(newDate);
        emit selectionChanged();
    }
}


/*! \enum QCalendarWidget::HorizontalHeaderFormat

    This enum type defines the various formats the horizontal header can display.

    \value SingleLetterDayNames The header displays a single letter abbreviation for day names (e.g. M for Monday).
    \value ShortDayNames The header displays a short abbreviation for day names (e.g. Mon for Monday).
    \value LongDayNames The header displays complete day names (e.g. Monday).
    \value NoHorizontalHeader The header is hidden.

    \sa horizontalHeaderFormat(), VerticalHeaderFormat
*/

/*!
    \property QCalendarWidget::horizontalHeaderFormat
    \brief the format of the horizontal header.

    The default value is QCalendarWidget::ShortDayNames.
*/

void QCalendarWidget::setHorizontalHeaderFormat(QCalendarWidget::HorizontalHeaderFormat format)
{
    Q_D(QCalendarWidget);
    if (d->m_model->m_horizontalHeaderFormat == format)
        return;

    d->m_model->setHorizontalHeaderFormat(format);
    d->cachedSizeHint = QSize();
    d->m_view->viewport()->update();
    d->m_view->updateGeometry();
}

QCalendarWidget::HorizontalHeaderFormat QCalendarWidget::horizontalHeaderFormat() const
{
    Q_D(const QCalendarWidget);
    return d->m_model->m_horizontalHeaderFormat;
}


/*! 
    \enum QCalendarWidget::VerticalHeaderFormat

    This enum type defines the various formats the vertical header can display.

    \value ISOWeekNumbers The header displays ISO week numbers as described by \l QDate::weekNumber().
    \value NoVerticalHeader The header is hidden.

    \sa verticalHeaderFormat(), HorizontalHeaderFormat
*/

/*!
    \property QCalendarWidget::verticalHeaderFormat
    \brief the format of the vertical header.

    The default value is QCalendarWidget::ISOWeekNumber.
*/

QCalendarWidget::VerticalHeaderFormat QCalendarWidget::verticalHeaderFormat() const
{
    Q_D(const QCalendarWidget);
    bool shown = d->m_model->weekNumbersShown();
    if (shown)
        return QCalendarWidget::ISOWeekNumbers;
    return QCalendarWidget::NoVerticalHeader;
}

void QCalendarWidget::setVerticalHeaderFormat(QCalendarWidget::VerticalHeaderFormat format)
{
    Q_D(QCalendarWidget);
    bool show = false;
    if (format == QCalendarWidget::ISOWeekNumbers)
        show = true;
    if (d->m_model->weekNumbersShown() == show)
        return;
    d->m_model->setWeekNumbersShown(show);
    d->cachedSizeHint = QSize();
    d->m_view->viewport()->update();
    d->m_view->updateGeometry();
}

/*!
    \property QCalendarWidget::gridVisible
    \brief whether the table grid is displayed.

    \table
    \row
        \o \inlineimage qcalendarwidget-grid.png
    \row
        \o
        \snippet doc/src/snippets/code/src_gui_widgets_qcalendarwidget.cpp 5
    \endtable

    The default value is false.
*/

bool QCalendarWidget::isGridVisible() const
{
    Q_D(const QCalendarWidget);
    return d->m_view->showGrid();
}

void QCalendarWidget::setGridVisible(bool show)
{
    Q_D(QCalendarWidget);
    d->m_view->setShowGrid(show);
    d->cachedSizeHint = QSize();
    d->m_view->viewport()->update();
    d->m_view->updateGeometry();
}

/*!
    \property QCalendarWidget::selectionMode
    \brief the type of selection the user can make in the calendar

    When this property is set to SingleSelection, the user can select a date
    within the minimum and maximum allowed dates, using either the mouse or
    the keyboard.

    When the property is set to NoSelection, the user will be unable to select
    dates, but they can still be selected programmatically. Note that the date
    that is selected when the property is set to NoSelection will still be
    the selected date of the calendar.

    The default value is SingleSelection.
*/

QCalendarWidget::SelectionMode QCalendarWidget::selectionMode() const
{
    Q_D(const QCalendarWidget);
    return d->m_view->readOnly ? QCalendarWidget::NoSelection : QCalendarWidget::SingleSelection;
}

void QCalendarWidget::setSelectionMode(SelectionMode mode)
{
    Q_D(QCalendarWidget);
    d->m_view->readOnly = (mode == QCalendarWidget::NoSelection);
    d->setNavigatorEnabled(isDateEditEnabled() && (selectionMode() != QCalendarWidget::NoSelection));
    d->update();
}

/*!
    \property QCalendarWidget::firstDayOfWeek
    \brief a value identifying the day displayed in the first column.

    By default, the day displayed in the first column is Sunday
*/

void QCalendarWidget::setFirstDayOfWeek(Qt::DayOfWeek dayOfWeek)
{
    Q_D(QCalendarWidget);
    if ((Qt::DayOfWeek)d->m_model->firstColumnDay() == dayOfWeek)
        return;

    d->m_model->setFirstColumnDay(dayOfWeek);
    d->update();
}

Qt::DayOfWeek QCalendarWidget::firstDayOfWeek() const
{
    Q_D(const QCalendarWidget);
    return (Qt::DayOfWeek)d->m_model->firstColumnDay();
}

/*!
    Returns the text char format for rendering the header.
*/
QTextCharFormat QCalendarWidget::headerTextFormat() const
{
    Q_D(const QCalendarWidget);
    return d->m_model->m_headerFormat;
}

/*!
    Sets the text char format for rendering the header to \a format.
    If you also set a weekday text format, this format's foreground and
    background color will take precedence over the header's format.
    The other formatting information will still be decided by
    the header's format.
*/
void QCalendarWidget::setHeaderTextFormat(const QTextCharFormat &format)
{
    Q_D(QCalendarWidget);
    d->m_model->m_headerFormat = format;
    d->cachedSizeHint = QSize();
    d->m_view->viewport()->update();
    d->m_view->updateGeometry();
}

/*!
    Returns the text char format for rendering of day in the week \a dayOfWeek.

    \sa headerTextFormat()
*/
QTextCharFormat QCalendarWidget::weekdayTextFormat(Qt::DayOfWeek dayOfWeek) const
{
    Q_D(const QCalendarWidget);
    return d->m_model->m_dayFormats.value(dayOfWeek);
}

/*!
    Sets the text char format for rendering of day in the week \a dayOfWeek to \a format.
    The format will take precedence over the header format in case of foreground
    and background color. Other text formatting information is taken from the headers format.

    \sa setHeaderTextFormat()
*/
void QCalendarWidget::setWeekdayTextFormat(Qt::DayOfWeek dayOfWeek, const QTextCharFormat &format)
{
    Q_D(QCalendarWidget);
    d->m_model->m_dayFormats[dayOfWeek] = format;
    d->cachedSizeHint = QSize();
    d->m_view->viewport()->update();
    d->m_view->updateGeometry();
}

/*!
    Returns a QMap from QDate to QTextCharFormat showing all dates
    that use a special format that alters their rendering.
*/
QMap<QDate, QTextCharFormat> QCalendarWidget::dateTextFormat() const
{
    Q_D(const QCalendarWidget);
    return d->m_model->m_dateFormats;
}

/*!
    Returns a QTextCharFormat for \a date. The char format can be be
    empty if the date is not renderd specially.
*/
QTextCharFormat QCalendarWidget::dateTextFormat(const QDate &date) const
{
    Q_D(const QCalendarWidget);
    return d->m_model->m_dateFormats.value(date);
}

/*!
    Sets the format used to render the given \a date to that specified by \a format.

    If \a date is null, all date formats are cleared.
*/
void QCalendarWidget::setDateTextFormat(const QDate &date, const QTextCharFormat &format)
{
    Q_D(QCalendarWidget);
    if (date.isNull())
        d->m_model->m_dateFormats.clear();
    else
        d->m_model->m_dateFormats[date] = format;
    d->m_view->viewport()->update();
    d->m_view->updateGeometry();
}

/*!
    \property QCalendarWidget::dateEditEnabled
    \brief whether the date edit popup is enabled
    \since 4.3

    If this property is enabled, pressing a non-modifier key will cause a
    date edit to popup if the calendar widget has focus, allowing the user
    to specify a date in the form specified by the current locale.

    By default, this property is enabled.

    The date edit is simpler in appearance than QDateEdit, but allows the
    user to navigate between fields using the left and right cursor keys,
    increment and decrement individual fields using the up and down cursor
    keys, and enter values directly using the number keys.

    \sa QCalendarWidget::dateEditAcceptDelay
*/
bool QCalendarWidget::isDateEditEnabled() const
{
    Q_D(const QCalendarWidget);
    return d->m_dateEditEnabled;
}

void QCalendarWidget::setDateEditEnabled(bool enable)
{
    Q_D(QCalendarWidget);
    if (isDateEditEnabled() == enable)
        return;

    d->m_dateEditEnabled = enable;

    d->setNavigatorEnabled(enable && (selectionMode() != QCalendarWidget::NoSelection));
}

/*!
    \property QCalendarWidget::dateEditAcceptDelay
    \brief the time an inactive date edit is shown before its contents are accepted
    \since 4.3

    If the calendar widget's \l{dateEditEnabled}{date edit is enabled}, this
    property specifies the amount of time (in millseconds) that the date edit
    remains open after the most recent user input. Once this time has elapsed,
    the date specified in the date edit is accepted and the popup is closed.

    By default, the delay is defined to be 1500 milliseconds (1.5 seconds).
*/
int QCalendarWidget::dateEditAcceptDelay() const
{
    Q_D(const QCalendarWidget);
    return d->m_navigator->dateEditAcceptDelay();
}

void QCalendarWidget::setDateEditAcceptDelay(int delay)
{
    Q_D(QCalendarWidget);
    d->m_navigator->setDateEditAcceptDelay(delay);
}

/*!
    \since 4.4

    Updates the cell specified by the given \a date unless updates
    are disabled or the cell is hidden.

    \sa updateCells(), yearShown(), monthShown()
*/
void QCalendarWidget::updateCell(const QDate &date)
{
    if (!date.isValid()) {
        qWarning("QCalendarWidget::updateCell: Invalid date");
        return;
    }

    if (!isVisible())
        return;

    Q_D(QCalendarWidget);
    int row, column;
    d->m_model->cellForDate(date, &row, &column);
    if (row == -1 || column == -1)
        return;

    QModelIndex modelIndex = d->m_model->index(row, column);
    if (!modelIndex.isValid())
        return;

    d->m_view->viewport()->update(d->m_view->visualRect(modelIndex));
}

/*!
    \since 4.4

    Updates all visible cells unless updates are disabled.

    \sa updateCell()
*/
void QCalendarWidget::updateCells()
{
    Q_D(QCalendarWidget);
    if (isVisible())
        d->m_view->viewport()->update();
}

/*!
    \fn void QCalendarWidget::selectionChanged()

    This signal is emitted when the currently selected date is
    changed.

    The currently selected date can be changed by the user using the
    mouse or keyboard, or by the programmer using setSelectedDate().

    \sa selectedDate()
*/

/*!
    \fn void QCalendarWidget::currentPageChanged(int year, int month)

    This signal is emitted when the currently shown month is changed.
    The new \a year and \a month are passed as parameters.

    \sa setCurrentPage()
*/

/*!
    \fn void QCalendarWidget::activated(const QDate &date)

    This signal is emitted whenever the user presses the Return or
    Enter key or double-clicks a \a date in the calendar
    widget.
*/

/*!
    \fn void QCalendarWidget::clicked(const QDate &date)

    This signal is emitted when a mouse button is clicked. The date
    the mouse was clicked on is specified by \a date. The signal is
    only emitted when clicked on a valid date, e.g., dates are not
    outside the minimumDate() and maximumDate(). If the selection mode
    is NoSelection, this signal will not be emitted.

*/

/*!
    \property QCalendarWidget::headerVisible
    \brief whether the navigation bar is shown or not

    \obsolete

    Use navigationBarVisible() instead.

    By default, this property is true.
*/

/*!
    \obsolete

    Use setNavigationBarVisible() instead.
*/
bool QCalendarWidget::isHeaderVisible() const
{
    Q_D(const QCalendarWidget);
    return d->navBarVisible;
}

/*!
    \obsolete

    Use setNavigationBarVisible() instead.

*/
void QCalendarWidget::setHeaderVisible(bool visible)
{
    setNavigationBarVisible(visible);
}

/*!
    \property QCalendarWidget::navigationBarVisible
    \brief whether the navigation bar is shown or not

    \since 4.3

    When this property is true (the default), the next month,
    previous month, month selection, year selection controls are
    shown on top.

    When the property is set to false, these controls are hidden.
*/

void QCalendarWidget::setNavigationBarVisible(bool visible)
{
    Q_D(QCalendarWidget);
    d->navBarVisible = visible;
    d->cachedSizeHint = QSize();
    d->navBarBackground->setVisible(visible);
    updateGeometry();
}

/*!
  \reimp
*/
bool QCalendarWidget::event(QEvent *event)
{
    Q_D(QCalendarWidget);
    switch (event->type()) {
        case QEvent::LayoutDirectionChange:
            d->updateButtonIcons();
        case QEvent::LocaleChange:
            d->cachedSizeHint = QSize();
            d->updateMonthMenuNames();
            d->updateNavigationBar();
            d->m_view->updateGeometry();
            break;
        case QEvent::FontChange:
        case QEvent::ApplicationFontChange:
            d->cachedSizeHint = QSize();
            d->m_view->updateGeometry();
            break;
        case QEvent::StyleChange:
            d->cachedSizeHint = QSize();
            d->m_view->updateGeometry();
        default:
            break;
    }
    return QWidget::event(event);
}

/*!
  \reimp
*/
bool QCalendarWidget::eventFilter(QObject *watched, QEvent *event)
{
    Q_D(QCalendarWidget);
    if (event->type() == QEvent::MouseButtonPress && d->yearEdit->hasFocus()) {
        QWidget *tlw = window();
        QWidget *widget = static_cast<QWidget*>(watched);
        //as we have a event filter on the whole application we first make sure that the top level widget
        //of both this and the watched widget are the same to decide if we should finish the year edition.
        if (widget->window() == tlw) {
            QPoint mousePos = widget->mapTo(tlw, static_cast<QMouseEvent *>(event)->pos());
            QRect geom = QRect(d->yearEdit->mapTo(tlw, QPoint(0, 0)), d->yearEdit->size());
            if (!geom.contains(mousePos)) {
                event->accept();
                d->_q_yearEditingFinished();
                setFocus();
                return true;
            }
        }
    }
    return QWidget::eventFilter(watched, event);
}

/*!
  \reimp
*/
void QCalendarWidget::mousePressEvent(QMouseEvent *event)
{
    setAttribute(Qt::WA_NoMouseReplay);
    QWidget::mousePressEvent(event);
    setFocus();
}

/*!
  \reimp
*/
void QCalendarWidget::resizeEvent(QResizeEvent * event)
{
    Q_D(QCalendarWidget);

    // XXX Should really use a QWidgetStack for yearEdit and yearButton,
    // XXX here we hide the year edit when the layout is likely to break
    // XXX the manual positioning of the yearEdit over the yearButton.
    if(d->yearEdit->isVisible() && event->size().width() != event->oldSize().width())
        d->_q_yearEditingFinished();

    QWidget::resizeEvent(event);
}

/*!
  \reimp
*/
void QCalendarWidget::keyPressEvent(QKeyEvent * event)
{
    Q_D(QCalendarWidget);
    if(d->yearEdit->isVisible()&& event->key() == Qt::Key_Escape)
    {
        d->yearEdit->setValue(yearShown());
        d->_q_yearEditingFinished();
        return;
    }
    QWidget::keyPressEvent(event);
}

QT_END_NAMESPACE

#include "qcalendarwidget.moc"
#include "moc_qcalendarwidget.cpp"

#endif //QT_NO_CALENDARWIDGET