summaryrefslogtreecommitdiffstats
path: root/src/gui/kernel/qx11embed_x11.cpp
blob: f70ed57acdbb89fa314c4c346a4abd5645b83c30 (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
/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtGui module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** 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, Nokia gives you certain
** additional rights. These rights are described in the Nokia Qt LGPL
** Exception version 1.0, 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.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at http://www.qtsoftware.com/contact.
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qx11embed_x11.h"
#include <qapplication.h>
#include <qevent.h>
#include <qpainter.h>
#include <qlayout.h>
#include <qstyle.h>
#include <qstyleoption.h>
#include <qdatetime.h>
#include <qpointer.h>
#include <qdebug.h>
#include <qx11info_x11.h>
#include <private/qt_x11_p.h>
#include <private/qwidget_p.h>

#define XK_MISCELLANY
#define XK_LATIN1
#define None 0
#include <X11/Xlib.h>
#include <X11/Xatom.h>
#include <X11/Xutil.h>
#include <X11/keysymdef.h>
#include <X11/X.h>

#ifndef XK_ISO_Left_Tab
#define XK_ISO_Left_Tab 0xFE20
#endif

//#define QX11EMBED_DEBUG
#ifdef QX11EMBED_DEBUG
#include <qdebug.h>
#endif

QT_BEGIN_NAMESPACE

/*!
    \class QX11EmbedWidget
    \ingroup advanced

    \brief The QX11EmbedWidget class provides an XEmbed client widget.

    XEmbed is an X11 protocol that supports the embedding of a widget
    from one application into another application.

    An XEmbed \e{client widget} is a window that is embedded into a
    \e container. A container is the graphical location that embeds
    (or \e swallows) an external application.

    QX11EmbedWidget is a widget used for writing XEmbed applets or
    plugins. When it has been embedded and the container receives tab
    focus, focus is passed on to the widget. When the widget reaches
    the end of its focus chain, focus is passed back to the
    container. Window activation, accelerator support, modality and
    drag and drop (XDND) are also handled.

    The widget and container can both initiate the embedding. If the
    widget is the initiator, the X11 window ID of the container that
    it wants to embed itself into must be passed to embedInto().

    If the container initiates the embedding, the window ID of the
    embedded widget must be known. The container calls embed(),
    passing the window ID.

    This example shows an application that embeds a QX11EmbedWidget
    subclass into the window whose ID is passed as a command-line
    argument:

    \snippet doc/src/snippets/qx11embedwidget/main.cpp 0

    The problem of obtaining the window IDs is often solved by the
    container invoking the application that provides the widget as a
    separate process (as a panel invokes a docked applet), passing
    its window ID to the new process as a command-line argument. The
    new process can then call embedInto() with the container's window
    ID, as shown in the example code above. Similarly, the new
    process can report its window ID to the container through IPC, in
    which case the container can embed the widget.

    When the widget has been embedded, it emits the signal
    embedded(). If it is closed by the container, the widget emits
    containerClosed(). If an error occurs when embedding, error() is
    emitted.

    There are XEmbed widgets available for KDE and GTK+. The GTK+
    equivalent of QX11EmbedWidget is GtkPlug. The KDE widget is called
    QXEmbed.

    \sa QX11EmbedContainer, {XEmbed Specification}
*/

/*!
    \class QX11EmbedContainer
    \ingroup advanced

    \brief The QX11EmbedContainer class provides an XEmbed container
    widget.

    XEmbed is an X11 protocol that supports the embedding of a widget
    from one application into another application.

    An XEmbed \e container is the graphical location that embeds an
    external \e {client widget}. A client widget is a window that is
    embedded into a container.

    When a widget has been embedded and the container receives tab
    focus, focus is passed on to the widget. When the widget reaches
    the end of its focus chain, focus is passed back to the
    container. Window activation, accelerator support, modality and
    drag and drop (XDND) are also handled.

    QX11EmbedContainer is commonly used for writing panels or
    toolbars that hold applets, or for \e swallowing X11
    applications. When writing a panel application, one container
    widget is created on the toolbar, and it can then either swallow
    another widget using embed(), or allow an XEmbed widget to be
    embedded into itself. The container's X11 window ID, which is
    retrieved with winId(), must then be known to the client widget.
    After embedding, the client's window ID can be retrieved with
    clientWinId().

    In the following example, a container widget is created as the
    main widget. It then invokes an application called "playmovie",
    passing its window ID as a command line argument. The "playmovie"
    program is an XEmbed client widget. The widget embeds itself into
    the container using the container's window ID.

    \snippet doc/src/snippets/qx11embedcontainer/main.cpp 0

    When the client widget is embedded, the container emits the
    signal clientIsEmbedded(). The signal clientClosed() is emitted
    when a widget is closed.

    It is possible for QX11EmbedContainer to embed XEmbed widgets
    from toolkits other than Qt, such as GTK+. Arbitrary (non-XEmbed)
    X11 widgets can also be embedded, but the XEmbed-specific
    features such as window activation and focus handling are then
    lost.

    The GTK+ equivalent of QX11EmbedContainer is GtkSocket. The KDE
    widget is called QXEmbed.

    \sa QX11EmbedWidget, {XEmbed Specification}
*/

/*! \fn void QX11EmbedWidget::embedded()

    This signal is emitted by the widget that has been embedded by an
    XEmbed container.
*/

/*! \fn void QX11EmbedWidget::containerClosed()

    This signal is emitted by the client widget when the container
    closes the widget. This can happen if the container itself
    closes, or if the widget is rejected.

    The container can reject a widget for any reason, but the most
    common cause of a rejection is when an attempt is made to embed a
    widget into a container that already has an embedded widget.
*/

/*! \fn void QX11EmbedContainer::clientIsEmbedded()

    This signal is emitted by the container when a client widget has
    been embedded.
*/

/*! \fn void QX11EmbedContainer::clientClosed()

    This signal is emitted by the container when the client widget
    closes.
*/

/*!
    \fn void QX11EmbedWidget::error(QX11EmbedWidget::Error error)

    This signal is emitted if an error occurred as a result of
    embedding into or communicating with a container. The specified
    \a error describes the problem that occurred.

    \sa QX11EmbedWidget::Error
*/

/*!
    \fn QX11EmbedContainer::Error QX11EmbedContainer::error() const

    Returns the last error that occurred.
*/

/*! \fn void QX11EmbedContainer::error(QX11EmbedContainer::Error error)

    This signal is emitted if an error occurred when embedding or
    communicating with a client. The specified \a error describes the
    problem that occurred.

    \sa QX11EmbedContainer::Error
*/

/*!
    \enum QX11EmbedWidget::Error

    \value Unknown An unrecognized error occurred.

    \value InvalidWindowID The X11 window ID of the container was
        invalid. This error is usually triggered by passing an invalid
        window ID to embedInto().

    \omitvalue Internal
*/

/*!
    \enum QX11EmbedContainer::Error

    \value Unknown An unrecognized error occurred.

    \value InvalidWindowID The X11 window ID of the container was
        invalid. This error is usually triggered by passing an invalid
        window ID to embed().

    \omitvalue Internal
*/

const int XButtonPress = ButtonPress;
const int XButtonRelease = ButtonRelease;
#undef ButtonPress
#undef ButtonRelease

// This is a hack to move topData() out from QWidgetPrivate to public.  We
// need to to inspect window()'s embedded state.
class QHackWidget : public QWidget
{
    Q_DECLARE_PRIVATE(QWidget)
public:
    QTLWExtra* topData() { return d_func()->topData(); }
};

static unsigned int XEMBED_VERSION = 0;

enum QX11EmbedMessageType {
    XEMBED_EMBEDDED_NOTIFY = 0,
    XEMBED_WINDOW_ACTIVATE = 1,
    XEMBED_WINDOW_DEACTIVATE = 2,
    XEMBED_REQUEST_FOCUS = 3,
    XEMBED_FOCUS_IN = 4,
    XEMBED_FOCUS_OUT = 5,
    XEMBED_FOCUS_NEXT = 6,
    XEMBED_FOCUS_PREV = 7,
    XEMBED_MODALITY_ON = 10,
    XEMBED_MODALITY_OFF = 11,
    XEMBED_REGISTER_ACCELERATOR = 12,
    XEMBED_UNREGISTER_ACCELERATOR = 13,
    XEMBED_ACTIVATE_ACCELERATOR = 14
};

enum QX11EmbedFocusInDetail {
    XEMBED_FOCUS_CURRENT = 0,
    XEMBED_FOCUS_FIRST = 1,
    XEMBED_FOCUS_LAST = 2
};

enum QX11EmbedFocusInFlags {
    XEMBED_FOCUS_OTHER = (0 << 0),
    XEMBED_FOCUS_WRAPAROUND = (1 << 0)
};

enum QX11EmbedInfoFlags {
    XEMBED_MAPPED = (1 << 0)
};

enum QX11EmbedAccelModifiers {
    XEMBED_MODIFIER_SHIFT = (1 << 0),
    XEMBED_MODIFIER_CONTROL = (1 << 1),
    XEMBED_MODIFIER_ALT = (1 << 2),
    XEMBED_MODIFIER_SUPER = (1 << 3),
    XEMBED_MODIFIER_HYPER = (1 << 4)
};

enum QX11EmbedAccelFlags {
    XEMBED_ACCELERATOR_OVERLOADED = (1 << 0)
};

// Silence the default X11 error handler.
static int x11ErrorHandler(Display *, XErrorEvent *)
{
    return 0;
}

// Returns the X11 timestamp. Maintained mainly by qapplication
// internals, but also updated by the XEmbed widgets.
static Time x11Time()
{
    return qt_x11Data->time;
}

// Gives the version and flags of the supported XEmbed protocol.
static unsigned int XEmbedVersion()
{
    return 0;
}

// Sends an XEmbed message.
static void sendXEmbedMessage(WId window, Display *display, long message,
                  long detail = 0, long data1 = 0, long data2 = 0)
{
    XClientMessageEvent c;
    memset(&c, 0, sizeof(c));
    c.type = ClientMessage;
    c.message_type = ATOM(_XEMBED);
    c.format = 32;
    c.display = display;
    c.window = window;

    c.data.l[0] = x11Time();
    c.data.l[1] = message;
    c.data.l[2] = detail;
    c.data.l[3] = data1;
    c.data.l[4] = data2;

    XSendEvent(display, window, false, NoEventMask, (XEvent *) &c);
}

// From qapplication_x11.cpp
static XKeyEvent lastKeyEvent;

static QCoreApplication::EventFilter oldX11EventFilter;

// The purpose of this global x11 filter is for one to capture the key
// events in their original state, but most importantly this is the
// only way to get the WM_TAKE_FOCUS message from WM_PROTOCOLS.
static bool x11EventFilter(void *message, long *result)
{
    XEvent *event = reinterpret_cast<XEvent *>(message);
    if (event->type == XKeyPress || event->type == XKeyRelease)
	lastKeyEvent = event->xkey;

    if (oldX11EventFilter && oldX11EventFilter != &x11EventFilter)
	return oldX11EventFilter(message, result);
    else
	return false;
}

//
struct functorData
{
    Window id, rootWindow;
    bool clearedWmState;
    bool reparentedToRoot;
};

static Bool functor(Display *display, XEvent *event, XPointer arg)
{
    functorData *data = (functorData *) arg;

    if (!data->reparentedToRoot && event->type == ReparentNotify
        && event->xreparent.window == data->id
        && event->xreparent.parent == data->rootWindow) {
        data->reparentedToRoot = true;
        return true;
    }

    if (!data->clearedWmState
        && event->type == PropertyNotify
        && event->xproperty.window == data->id
        && event->xproperty.atom == ATOM(WM_STATE)) {
	if (event->xproperty.state == PropertyDelete) {
            data->clearedWmState = true;
            return true;
        }

	Atom ret;
	int format, status;
	unsigned char *retval;
	unsigned long nitems, after;
	status = XGetWindowProperty(display, data->id, ATOM(WM_STATE), 0, 2, False, ATOM(WM_STATE),
				    &ret, &format, &nitems, &after, &retval );
	if (status == Success && ret == ATOM(WM_STATE) && format == 32 && nitems > 0) {
            long *state = (long *)retval;
	    if (state[0] == WithdrawnState) {
                data->clearedWmState = true;
		return true;
            }
	}
    }

    return false;
}

class QX11EmbedWidgetPrivate : public QWidgetPrivate
{
    Q_DECLARE_PUBLIC(QX11EmbedWidget)
public:
    inline QX11EmbedWidgetPrivate()
    {
        lastError = QX11EmbedWidget::Unknown;
        container = 0;
    }

    void setEmbedded();

    void emitError(QX11EmbedWidget::Error error) {
        Q_Q(QX11EmbedWidget);

        lastError = error;
        emit q->error(error);
    }

    enum FocusWidgets {
        FirstFocusWidget,
        LastFocusWidget
    };

    int focusOriginator;
    QWidget *getFocusWidget(FocusWidgets fw);
    void checkActivateWindow(QObject *o);
    QX11EmbedWidget *xEmbedWidget(QObject *o) const;
    void clearFocus();

    WId container;
    QPointer<QWidget> currentFocus;

    QX11EmbedWidget::Error lastError;

};

/*!
    Constructs a QX11EmbedWidget object with the given \a parent.
*/
QX11EmbedWidget::QX11EmbedWidget(QWidget *parent)
    : QWidget(*new QX11EmbedWidgetPrivate, parent, 0)
{
    XSetErrorHandler(x11ErrorHandler);

    setAttribute(Qt::WA_NativeWindow);
    setAttribute(Qt::WA_DontCreateNativeAncestors);
    createWinId();
    XSelectInput(x11Info().display(), internalWinId(),
                 KeyPressMask | KeyReleaseMask | ButtonPressMask
                    | ButtonReleaseMask
                    | KeymapStateMask | ButtonMotionMask | PointerMotionMask
                    | FocusChangeMask
                    | ExposureMask | StructureNotifyMask
                    | SubstructureNotifyMask | PropertyChangeMask);

    long data[] = {XEMBED_VERSION, XEMBED_MAPPED};
    XChangeProperty(x11Info().display(), internalWinId(), ATOM(_XEMBED_INFO),
                    ATOM(_XEMBED_INFO), 32, PropModeReplace,
                    (unsigned char*) data, 2);

    setFocusPolicy(Qt::StrongFocus);
    setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
    QApplication::instance()->installEventFilter(this);

#ifdef QX11EMBED_DEBUG
    qDebug() << "QX11EmbedWidget::QX11EmbedWidget: constructed client"
             << (void *)this << "with winId" << winId();
#endif
}

/*!
    Destructs the QX11EmbedWidget object. If the widget is embedded
    when deleted, it is hidden and then detached from its container,
    so that the container is free to embed a new widget.
*/
QX11EmbedWidget::~QX11EmbedWidget()
{
    Q_D(QX11EmbedWidget);
    if (d->container) {
#ifdef QX11EMBED_DEBUG
        qDebug() << "QX11EmbedWidget::~QX11EmbedWidget: unmapping"
                 << (void *)this << "with winId" << winId()
                 << "from container with winId" << d->container;
#endif
        XUnmapWindow(x11Info().display(), internalWinId());
        XReparentWindow(x11Info().display(), internalWinId(), x11Info().appRootWindow(), 0, 0);
    }

#ifdef QX11EMBED_DEBUG
    qDebug() << "QX11EmbedWidget::~QX11EmbedWidget: destructed client"
             << (void *)this << "with winId" << winId();
#endif
}

/*!
    Returns the type of error that occurred last. This is the same error code
    that is emitted by the error() signal.

    \sa Error
*/
QX11EmbedWidget::Error QX11EmbedWidget::error() const
{
    return d_func()->lastError;
}

/*!
    When this function is called, the widget embeds itself into the
    container whose window ID is \a id.

    If \a id is \e not the window ID of a container this function will
    behave unpredictably.
*/
void QX11EmbedWidget::embedInto(WId id)
{
    Q_D(QX11EmbedWidget);
#ifdef QX11EMBED_DEBUG
    qDebug() << "QX11EmbedWidget::embedInto: embedding client"
             << (void *)this << "with winId" << winId() << "into container"
             << id;
#endif

    d->container = id;
    switch (XReparentWindow(x11Info().display(), internalWinId(), d->container, 0, 0)) {
    case BadWindow:
        d->emitError(InvalidWindowID);
        break;
    case BadMatch:
        d->emitError(Internal);
        break;
    case Success:
    default:
        break;
    }
    QTLWExtra* x = d->extra ? d->extra->topextra : 0;
    if (x)
        x->frameStrut.setCoords(0, 0, 0, 0);
    d->data.fstrut_dirty = false;
}

/*! \internal

    Gets the first or last child widget that can get focus.
*/
QWidget *QX11EmbedWidgetPrivate::getFocusWidget(FocusWidgets fw)
{
    Q_Q(QX11EmbedWidget);
    QWidget *tlw = q;
    QWidget *w = tlw->nextInFocusChain();

    QWidget *last = tlw;

    extern bool qt_tab_all_widgets;
    uint focus_flag = qt_tab_all_widgets ? Qt::TabFocus : Qt::StrongFocus;

    while (w != tlw)
    {
        if (((w->focusPolicy() & focus_flag) == focus_flag)
            && w->isVisibleTo(q) && w->isEnabled())
        {
            last = w;
            if (fw == FirstFocusWidget)
                break;
        }
        w = w->nextInFocusChain();
    }

    return last;
}

/*! \internal

    Returns the xembed widget that the widget is a child of
*/
QX11EmbedWidget *QX11EmbedWidgetPrivate::xEmbedWidget(QObject *o) const
{
    QX11EmbedWidget *xec = 0;

    // Check the widget itself, then its parents, and find the first
    // QX11EmbedWidget.
    do {
        if ((xec = qobject_cast<QX11EmbedWidget *>(o)))
            return xec;
    } while ((o = o->parent()));
    return 0;
}

/*! \internal

    Checks the active window.
*/
void QX11EmbedWidgetPrivate::checkActivateWindow(QObject *o)
{
    Q_Q(QX11EmbedWidget);
    QX11EmbedWidget *xec = xEmbedWidget(o);

    // check if we are in the right xembed client
    if (q != xec)
        return;

    QWidget *w = qobject_cast<QWidget *>(o);

    // if it is no active window, then don't do the change
    if (!(w && qApp->activeWindow()))
        return;

    // if it already is the active window, don't do anything
    if (w->window() != qApp->activeWindow())
    {
        qApp->setActiveWindow(w->window());
        currentFocus = w;

        sendXEmbedMessage(xec->containerWinId(), q->x11Info().display(), XEMBED_REQUEST_FOCUS);
    }
}

/*! \internal

    Clears the focus
*/
void QX11EmbedWidgetPrivate::clearFocus()
{
    Q_Q(QX11EmbedWidget);
    // Setting focus on the client itself removes Qt's
    // logical focus rectangle. We can't just do a
    // clearFocus here, because when we send the synthetic
    // FocusIn to ourselves on activation, Qt will set
    // focus on focusWidget() again. This way, we "hide"
    // focus rather than clearing it.

    if (!q->window()->hasFocus())
        q->window()->setFocus(Qt::OtherFocusReason);

    currentFocus = 0;
}

/*! \internal

    Sets the embedded flag on the client.
*/
void QX11EmbedWidgetPrivate::setEmbedded()
{
    Q_Q(QX11EmbedWidget);
    ((QHackWidget *)q->window())->topData()->embedded = 1;
}

/*! \internal

    Handles WindowActivate and FocusIn events for the client.
*/
bool QX11EmbedWidget::eventFilter(QObject *o, QEvent *event)
{
    Q_D(QX11EmbedWidget);
    switch (event->type()) {
    case QEvent::FocusIn:
        switch (((QFocusEvent *)event)->reason()) {
        case Qt::MouseFocusReason:
            // If the user clicks into one of the client widget's
            // children and we didn't have focus already, we request
            // focus from our container.
            if (d->xEmbedWidget(o) == this) {
                if (d->currentFocus.isNull())
                    sendXEmbedMessage(d->container, x11Info().display(), XEMBED_REQUEST_FOCUS);

                d->currentFocus = qobject_cast<QWidget *>(o);
            }
            break;
        case Qt::TabFocusReason:
            // If the xembed client receives a focus event because of
            // a Tab, then we are at the end of our focus chain and we
            // ask the container to move to its next focus widget.
            if (o == this) {
                d->clearFocus();
                sendXEmbedMessage(d->container, x11Info().display(), XEMBED_FOCUS_NEXT);
                return true;
            } else {
                // We're listening on events from qApp, so in order
                // for us to know who to set focus on if we receive an
                // activation event, we note the widget that got the
                // focusin last.
                if (d->xEmbedWidget(o) == this)
                    d->currentFocus = qobject_cast<QWidget *>(o);
            }
            break;
        case Qt::BacktabFocusReason:
            // If the window receives a focus event because of
            // a Backtab, then we are at the start of our focus chain
            // and we ask the container to move to its previous focus
            // widget.
            if (o == this) {
                // See comment for Tab.
                // If we receive a XEMBED_FOCUS_IN
                // XEMBED_FOCUS_CURRENT, we will set focus in
                // currentFocus. To avoid that in this case, we reset
                // currentFocus.
                d->clearFocus();
                sendXEmbedMessage(d->container, x11Info().display(), XEMBED_FOCUS_PREV);
                return true;
            } else {
                if (d->xEmbedWidget(o) == this)
                    d->currentFocus = qobject_cast<QWidget *>(o);
            }
            break;
        case Qt::ActiveWindowFocusReason:
            if (isActiveWindow()) {
                if (!d->currentFocus.isNull()) {
                    if (!d->currentFocus->hasFocus())
                        d->currentFocus->setFocus(Qt::OtherFocusReason);
                } else {
                    d->clearFocus();
                    return true;
                }
            }

            break;
        case Qt::PopupFocusReason:
        case Qt::ShortcutFocusReason:
        case Qt::OtherFocusReason:
            // If focus is received to any child widget because of any
            // other reason, remember the widget so that we can give
            // it focus again if we're activated.
            if (d->xEmbedWidget(o) == this) {
               d->currentFocus = qobject_cast<QWidget *>(o);
            }
            break;
        default:
            break;
        }
        break;
    case QEvent::MouseButtonPress:
        // If we get a mouse button press event inside a embedded widget
        // make sure this is the active window in qapp.
        d->checkActivateWindow(o);
        break;
    default:
        break;
    }

    return QWidget::eventFilter(o, event);
}

/*! \internal

    Handles some notification events and client messages. Client side
    XEmbed message receiving is also handled here.
*/
bool QX11EmbedWidget::x11Event(XEvent *event)
{
    Q_D(QX11EmbedWidget);
    switch (event->type) {
    case DestroyNotify:
#ifdef QX11EMBED_DEBUG
        qDebug() << "QX11EmbedWidget::x11Event: client"
                 << (void *)this << "with winId" << winId()
                 << "received a DestroyNotify";
#endif
        // If the container window is destroyed, we signal this to the user.
        d->container = 0;
        emit containerClosed();
        break;
    case ReparentNotify:
#ifdef QX11EMBED_DEBUG
        qDebug() << "QX11EmbedWidget::x11Event: client"
                 << (void *)this << "with winId" << winId()
                 << "received a ReparentNotify to"
                 << ((event->xreparent.parent == x11Info().appRootWindow())
                     ? QString::fromLatin1("root") : QString::number(event->xreparent.parent));
#endif
        // If the container shuts down, we will be reparented to the
        // root window. We must also consider the case that we may be
        // reparented from one container to another.
        if (event->xreparent.parent == x11Info().appRootWindow()) {
            if (((QHackWidget *)this)->topData()->embedded) {
                d->container = 0;
                emit containerClosed();
            }
            return true;
        } else {
            d->container = event->xreparent.parent;
        }
        break;
    case UnmapNotify:
        // Mapping and unmapping are handled by changes to the
        // _XEMBED_INFO property. Any default map/unmap requests are
        // ignored.
        return true;
    case PropertyNotify:
        // The container sends us map/unmap messages through the
        // _XEMBED_INFO property. We adhere to the XEMBED_MAPPED bit in
        // data2.
        if (event->xproperty.atom == ATOM(_XEMBED_INFO)) {
            Atom actual_type_return;
            int actual_format_return;
            unsigned long nitems_return;
            unsigned long bytes_after_return;
            unsigned char *prop_return = 0;
            if (XGetWindowProperty(x11Info().display(), internalWinId(), ATOM(_XEMBED_INFO), 0, 2,
                                   false, ATOM(_XEMBED_INFO), &actual_type_return,
                                   &actual_format_return, &nitems_return,
                                   &bytes_after_return, &prop_return) == Success) {
                if (nitems_return > 1) {
                    if (((int * )prop_return)[1] & XEMBED_MAPPED) {
                        XMapWindow(x11Info().display(), internalWinId());
                    } else {
                        XUnmapWindow(x11Info().display(), internalWinId());
                    }
                }
            }
        }

        break;
    case ClientMessage:
        // XEMBED messages have message_type _XEMBED
        if (event->xclient.message_type == ATOM(_XEMBED)) {
            // Discard XEMBED messages not to ourselves. (### dead code?)
            if (event->xclient.window != internalWinId())
                break;

            // Update qt_x_time if necessary
            Time msgtime = (Time) event->xclient.data.l[0];
            if (msgtime > X11->time)
                X11->time = msgtime;

            switch (event->xclient.data.l[1]) {
            case XEMBED_WINDOW_ACTIVATE: {
                // When we receive an XEMBED_WINDOW_ACTIVATE, we simply send
                // ourselves a WindowActivate event. Real activation happens
                // when receive XEMBED_FOCUS_IN.
                if (!isActiveWindow()) {
                    QEvent ev(QEvent::WindowActivate);
                    QApplication::sendEvent(this, &ev);
                }
            }
                break;
            case XEMBED_WINDOW_DEACTIVATE: {
                // When we receive an XEMBED_WINDOW_DEACTIVATE, we simply send
                // ourselves a WindowDeactivate event. Real activation happens
                // when receive XEMBED_FOCUS_IN.
                if (isActiveWindow()) {
                    if (!qApp->activePopupWidget())
                        QApplication::setActiveWindow(0);
                } else {
                    QEvent ev(QEvent::WindowDeactivate);
                    QApplication::sendEvent(this, &ev);
                }
            }
                break;
            case XEMBED_EMBEDDED_NOTIFY: {
#ifdef QX11EMBED_DEBUG
                qDebug() << "QX11EmbedWidget::x11Event: client"
                         << (void *)this << "with winId" << winId()
                         << "received an XEMBED EMBEDDED NOTIFY message";
#endif
                // In this message's l[2] we have the max version
                // supported by both the client and the
                // container. QX11EmbedWidget does not use this field.

                // We have been embedded, so we set our
                // client's embedded flag.
                d->setEmbedded();
                emit embedded();
            }
                break;
            case XEMBED_FOCUS_IN:
                // don't set the focus if a modal dialog is open
                if (qApp->activeModalWidget())
                    break;

                // in case we embed more than one topLevel window inside the same
                // host window.
                if (window() != qApp->activeWindow())
                    qApp->setActiveWindow(this);

                switch (event->xclient.data.l[2]) {
                case XEMBED_FOCUS_CURRENT:
                    // The container sends us this message if it wants
                    // us to focus on the widget that last had focus.
                    // This is the reply when XEMBED_REQUEST_FOCUS is
                    // sent to the container.
                    if (!d->currentFocus.isNull()) {
                        if (!d->currentFocus->hasFocus())
                            d->currentFocus->setFocus(Qt::OtherFocusReason);
                    } else {
                        // No widget currently has focus. We set focus
                        // on the first widget next to the
                        // client widget. Since the setFocus will not work
                        // if the window is disabled, set the currentFocus
                        // directly so that it's set on window activate.
                        d->currentFocus = d->getFocusWidget(QX11EmbedWidgetPrivate::FirstFocusWidget);
                        d->currentFocus->setFocus(Qt::OtherFocusReason);
                    }
                    break;
                case XEMBED_FOCUS_FIRST:
                    // The container sends this message when it wants
                    // us to focus on the first widget in our focus
                    // chain (typically because of a tab).
                    d->currentFocus = d->getFocusWidget(QX11EmbedWidgetPrivate::FirstFocusWidget);
                    d->currentFocus->setFocus(Qt::TabFocusReason);
                    break;
                case XEMBED_FOCUS_LAST:
                    // The container sends this message when it wants
                    // us to focus on the last widget in our focus
                    // chain (typically because of a backtab).
                    d->currentFocus = d->getFocusWidget(QX11EmbedWidgetPrivate::LastFocusWidget);
                    d->currentFocus->setFocus(Qt::BacktabFocusReason);
                    break;
                default:
                    // Ignore any other XEMBED_FOCUS_IN details.
                    break;
                }
                break;
            case XEMBED_FOCUS_OUT:
                // The container sends us this message when it wants us
                // to lose focus and forget about the widget that last
                // had focus. Typically sent by the container when it
                // loses focus because of mouse or tab activity. We do
                // then not want to set focus on anything if we're
                // activated.
                if (isActiveWindow())
                    d->clearFocus();

                break;
            default:
                // Ignore any other XEMBED messages.
                break;
            };
        } else {
            // Non-XEMBED client messages are not interesting.
        }

        break;
    default:
        // Ignore all other x11 events.
        break;
    }

    // Allow default handling.
    return QWidget::x11Event(event);
}

/*!
    \reimp
*/
bool QX11EmbedWidget::event(QEvent *event)
{
    if (event->type() == QEvent::ParentChange) {
        XSelectInput(x11Info().display(), internalWinId(),
                     KeyPressMask | KeyReleaseMask | ButtonPressMask
                     | ButtonReleaseMask
                     | KeymapStateMask | ButtonMotionMask | PointerMotionMask
                     | FocusChangeMask
                     | ExposureMask | StructureNotifyMask
                     | SubstructureNotifyMask | PropertyChangeMask);
    }
    return QWidget::event(event);
}

/*!
    \reimp
*/
void QX11EmbedWidget::resizeEvent(QResizeEvent *event)
{
    if (layout())
        layout()->update();
    QWidget::resizeEvent(event);
}

/*!
    If the widget is embedded, returns the window ID of the
    container; otherwize returns 0.
*/
WId QX11EmbedWidget::containerWinId() const
{
    Q_D(const QX11EmbedWidget);
    return d->container;
}

class QX11EmbedContainerPrivate : public QWidgetPrivate
{
    Q_DECLARE_PUBLIC(QX11EmbedContainer)
public:
    inline QX11EmbedContainerPrivate()
    {
        lastError = QX11EmbedContainer::Unknown;
        client = 0;
        focusProxy = 0;
        clientIsXEmbed = false;
        xgrab = false;
    }

    bool isEmbedded() const;
    void moveInputToProxy();

    void acceptClient(WId window);
    void rejectClient(WId window);

    void checkGrab();

    WId topLevelParentWinId() const;

    void emitError(QX11EmbedContainer::Error error) {
        Q_Q(QX11EmbedContainer);
        lastError = error;
        emit q->error(error);
    }

    WId client;
    QWidget *focusProxy;
    bool clientIsXEmbed;
    bool xgrab;
    QRect clientOriginalRect;
    QSize wmMinimumSizeHint;

    QX11EmbedContainer::Error lastError;

    static QX11EmbedContainer *activeContainer;
};

QX11EmbedContainer *QX11EmbedContainerPrivate::activeContainer = 0;

/*!
    Creates a QX11EmbedContainer object with the given \a parent.
*/
QX11EmbedContainer::QX11EmbedContainer(QWidget *parent)
    : QWidget(*new QX11EmbedContainerPrivate, parent, 0)
{
    Q_D(QX11EmbedContainer);
    XSetErrorHandler(x11ErrorHandler);

    setAttribute(Qt::WA_NativeWindow);
    setAttribute(Qt::WA_DontCreateNativeAncestors);
    createWinId();

    setFocusPolicy(Qt::StrongFocus);
    setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
    // ### PORT setKeyCompression(false);
    setAcceptDrops(true);
    setEnabled(false);

    // Everybody gets a focus proxy, but only one toplevel container's
    // focus proxy is actually in use.
    d->focusProxy = new QWidget(this);
    d->focusProxy->setAttribute(Qt::WA_NativeWindow);
    d->focusProxy->setAttribute(Qt::WA_DontCreateNativeAncestors);
    d->focusProxy->setGeometry(-1, -1, 1, 1);

    // We need events from the window (activation status) and
    // from qApp (keypress/release).
    qApp->installEventFilter(this);

    // Install X11 event filter.
    if (!oldX11EventFilter)
        oldX11EventFilter = QCoreApplication::instance()->setEventFilter(x11EventFilter);

    XSelectInput(x11Info().display(), internalWinId(),
                 KeyPressMask | KeyReleaseMask
                 | ButtonPressMask | ButtonReleaseMask | ButtonMotionMask
                 | KeymapStateMask
                 | PointerMotionMask
                 | EnterWindowMask | LeaveWindowMask
                 | FocusChangeMask
                 | ExposureMask
                 | StructureNotifyMask
                 | SubstructureNotifyMask);

    // Make sure our new event mask takes effect as soon as possible.
    XFlush(x11Info().display());

    // Move input to our focusProxy if this widget is active, and not
    // shaded by a modal dialog (in which case isActiveWindow() would
    // still return true, but where we must not move input focus).
    if (qApp->activeWindow() == window() && !d->isEmbedded())
        d->moveInputToProxy();

#ifdef QX11EMBED_DEBUG
    qDebug() << "QX11EmbedContainer::QX11EmbedContainer: constructed container"
             << (void *)this << "with winId" << winId();
#endif
}

/*!
    Destructs a QX11EmbedContainer.
*/
QX11EmbedContainer::~QX11EmbedContainer()
{
    Q_D(QX11EmbedContainer);
    if (d->client) {
	XUnmapWindow(x11Info().display(), d->client);
	XReparentWindow(x11Info().display(), d->client, x11Info().appRootWindow(), 0, 0);
    }

    if (d->xgrab)
	XUngrabButton(x11Info().display(), AnyButton, AnyModifier, internalWinId());
}


QX11EmbedContainer::Error QX11EmbedContainer::error() const {
    return d_func()->lastError;
}


/*! \reimp
*/
void QX11EmbedContainer::paintEvent(QPaintEvent *)
{
}

/*! \internal

    Returns wether or not the windows' embedded flag is set.
*/
bool QX11EmbedContainerPrivate::isEmbedded() const
{
    Q_Q(const QX11EmbedContainer);
    return ((QHackWidget *)q->window())->topData()->embedded == 1;
}

/*! \internal

    Returns the parentWinId of the window.
*/
WId QX11EmbedContainerPrivate::topLevelParentWinId() const
{
    Q_Q(const QX11EmbedContainer);
    return ((QHackWidget *)q->window())->topData()->parentWinId;
}

/*!
    If the container has an embedded widget, this function returns
    the X11 window ID of the client; otherwise it returns 0.
*/
WId QX11EmbedContainer::clientWinId() const
{
    Q_D(const QX11EmbedContainer);
    return d->client;
}

/*!
    Instructs the container to embed the X11 window with window ID \a
    id. The client widget will then move on top of the container
    window and be resized to fit into the container.

    The \a id should be the ID of a window controlled by an XEmbed
    enabled application, but this is not mandatory. If \a id does not
    belong to an XEmbed client widget, then focus handling,
    activation, accelerators and other features will not work
    properly.
*/
void QX11EmbedContainer::embedClient(WId id)
{
    Q_D(QX11EmbedContainer);

    if (id == 0) {
	d->emitError(InvalidWindowID);
	return;
    }

    // Walk up the tree of parent windows to prevent embedding of ancestors.
    WId thisId = internalWinId();
    Window rootReturn;
    Window parentReturn;
    Window *childrenReturn = 0;
    unsigned int nchildrenReturn;
    do {
        if (XQueryTree(x11Info().display(), thisId, &rootReturn,
                       &parentReturn, &childrenReturn, &nchildrenReturn) == 0) {
	    d->emitError(InvalidWindowID);
	    return;
        }
        if (childrenReturn) {
            XFree(childrenReturn);
            childrenReturn = 0;
        }

        thisId = parentReturn;
        if (id == thisId) {
	    d->emitError(InvalidWindowID);
	    return;
        }
    } while (thisId != rootReturn);

    // watch for property notify events (see below)
    XGrabServer(x11Info().display());
    XWindowAttributes attrib;
    if (!XGetWindowAttributes(x11Info().display(), id, &attrib)) {
        XUngrabServer(x11Info().display());
	d->emitError(InvalidWindowID);
	return;
    }
    XSelectInput(x11Info().display(), id, attrib.your_event_mask | PropertyChangeMask | StructureNotifyMask);
    XUngrabServer(x11Info().display());

    // Put the window into WithdrawnState
    XUnmapWindow(x11Info().display(), id);
    XSync(x11Info().display(), False); // make sure the window is hidden

    /*
      Wait for notification from the window manager that the window is
      in withdrawn state.  According to the ICCCM section 4.1.3.1,
      we should wait for the WM_STATE property to either be deleted or
      set to WithdrawnState.

      For safety, we will not wait more than 500 ms, so that we can
      preemptively workaround buggy window managers.
    */
    QTime t;
    t.start();

    functorData data;
    data.id = id;
    data.rootWindow = attrib.root;
    data.clearedWmState = false;
    data.reparentedToRoot = false;

    do {
	if (t.elapsed() > 500) // time-out after 500 ms
	    break;

	XEvent event;
	if (!XCheckIfEvent(x11Info().display(), &event, functor, (XPointer) &data)) {
	    XSync(x11Info().display(), False);
            usleep(50000);
	    continue;
	}

        qApp->x11ProcessEvent(&event);
    } while (!data.clearedWmState || !data.reparentedToRoot);

    // restore the event mask
    XSelectInput(x11Info().display(), id, attrib.your_event_mask);

    switch (XReparentWindow(x11Info().display(), id, internalWinId(), 0, 0)) {
    case BadWindow:
    case BadMatch:
	d->emitError(InvalidWindowID);
	break;
    default:
	break;
    }
}

/*! \internal

    Handles key, activation and focus events for the container.
*/
bool QX11EmbedContainer::eventFilter(QObject *o, QEvent *event)
{
    Q_D(QX11EmbedContainer);
    switch (event->type()) {
    case QEvent::KeyPress:
        // Forward any keypresses to our client.
	if (o == this && d->client) {
	    lastKeyEvent.window = d->client;
	    XSendEvent(x11Info().display(), d->client, false, KeyPressMask, (XEvent *) &lastKeyEvent);
	    return true;
	}
	break;
    case QEvent::KeyRelease:
	// Forward any keyreleases to our client.
	if (o == this && d->client) {
	    lastKeyEvent.window = d->client;
	    XSendEvent(x11Info().display(), d->client, false, KeyReleaseMask, (XEvent *) &lastKeyEvent);
	    return true;
	}
	break;

    case QEvent::WindowActivate:
	// When our container window is activated, we pass the
	// activation message on to our client. Note that X input
	// focus is set to our focus proxy. We want to intercept all
	// keypresses.
	if (o == window() && d->client) {
            if (!d->isEmbedded() && d->activeContainer == this)
                d->moveInputToProxy();

            if (d->clientIsXEmbed) {
                sendXEmbedMessage(d->client, x11Info().display(), XEMBED_WINDOW_ACTIVATE);
            } else {
                d->checkGrab();
                if (hasFocus())
                    XSetInputFocus(x11Info().display(), d->client, XRevertToParent, x11Time());
            }
	}
	break;
    case QEvent::WindowDeactivate:
	// When our container window is deactivated, we pass the
	// deactivation message to our client.
	if (o == window() && d->client) {
	    if (d->clientIsXEmbed)
		sendXEmbedMessage(d->client, x11Info().display(), XEMBED_WINDOW_DEACTIVATE);
	    else
		d->checkGrab();
	}
	break;
    case QEvent::FocusIn:
        // When receiving FocusIn events generated by Tab or Backtab,
	// we pass focus on to our client. Any mouse activity is sent
	// directly to the client, and it will ask us for focus with
	// XEMBED_REQUEST_FOCUS.
	if (o == this && d->client) {
            if (!d->isEmbedded())
                d->activeContainer = this;

            if (d->clientIsXEmbed) {
                if (!d->isEmbedded())
                    d->moveInputToProxy();

		QFocusEvent *fe = (QFocusEvent *)event;
		switch (fe->reason()) {
		case Qt::TabFocusReason:
		    sendXEmbedMessage(d->client, x11Info().display(), XEMBED_FOCUS_IN, XEMBED_FOCUS_FIRST);
		    break;
		case Qt::BacktabFocusReason:
		    sendXEmbedMessage(d->client, x11Info().display(), XEMBED_FOCUS_IN, XEMBED_FOCUS_LAST);
		    break;
		default:
		    sendXEmbedMessage(d->client, x11Info().display(), XEMBED_FOCUS_IN, XEMBED_FOCUS_CURRENT);
		    break;
		}
	    } else {
		d->checkGrab();
                XSetInputFocus(x11Info().display(), d->client, XRevertToParent, x11Time());
	    }
	}

	break;
    case QEvent::FocusOut: {
	// When receiving a FocusOut, we ask our client to remove its
	// focus.
	if (o == this && d->client) {
            if (!d->isEmbedded()) {
                d->activeContainer = 0;
                if (isActiveWindow())
                    d->moveInputToProxy();
            }

	    if (d->clientIsXEmbed) {
		QFocusEvent *fe = (QFocusEvent *)event;
		if (o == this && d->client && fe->reason() != Qt::ActiveWindowFocusReason)
		    sendXEmbedMessage(d->client, x11Info().display(), XEMBED_FOCUS_OUT);
	    } else {
		d->checkGrab();
	    }
	}
    }
	break;

    case QEvent::Close: {
	if (o == this && d->client) {
	    // Unmap the client and reparent it to the root window.
	    // Wait until the messages have been processed. Then ask
	    // the window manager to delete the window.
	    XUnmapWindow(x11Info().display(), d->client);
	    XReparentWindow(x11Info().display(), d->client, x11Info().appRootWindow(), 0, 0);
	    XSync(x11Info().display(), false);

	    XEvent ev;
	    memset(&ev, 0, sizeof(ev));
	    ev.xclient.type = ClientMessage;
	    ev.xclient.window = d->client;
	    ev.xclient.message_type = ATOM(WM_PROTOCOLS);
	    ev.xclient.format = 32;
	    ev.xclient.data.s[0] = ATOM(WM_DELETE_WINDOW);
	    XSendEvent(x11Info().display(), d->client, false, NoEventMask, &ev);

	    XFlush(x11Info().display());
	    d->client = 0;
	    d->clientIsXEmbed = false;
            d->wmMinimumSizeHint = QSize();
            updateGeometry();
            setEnabled(false);
	    update();

	    emit clientClosed();
	}
    }
    default:
	break;
    }

    return QWidget::eventFilter(o, event);
}

/*! \internal

    Handles X11 events for the container.
*/
bool QX11EmbedContainer::x11Event(XEvent *event)
{
    Q_D(QX11EmbedContainer);

    switch (event->type) {
    case CreateNotify:
	// The client created an embedded window.
	if (d->client)
	    d->rejectClient(event->xcreatewindow.window);
	else
	    d->acceptClient(event->xcreatewindow.window);
      break;
    case DestroyNotify:
	if (event->xdestroywindow.window == d->client) {
	    // The client died.
	    d->client = 0;
	    d->clientIsXEmbed = false;
            d->wmMinimumSizeHint = QSize();
            updateGeometry();
	    update();
            setEnabled(false);
	    emit clientClosed();
	}
        break;
    case ReparentNotify:
	// The client sends us this if it reparents itself out of our
	// widget.
	if (event->xreparent.window == d->client && event->xreparent.parent != internalWinId()) {
	    d->client = 0;
	    d->clientIsXEmbed = false;
            d->wmMinimumSizeHint = QSize();
            updateGeometry();
	    update();
            setEnabled(false);
	    emit clientClosed();
	} else if (event->xreparent.parent == internalWinId()) {
	    // The client reparented itself into this window.
	    if (d->client)
		d->rejectClient(event->xreparent.window);
	    else
		d->acceptClient(event->xreparent.window);
	}
	break;
    case ClientMessage: {
	if (event->xclient.message_type == ATOM(_XEMBED)) {
	    // Ignore XEMBED messages not to ourselves
	    if (event->xclient.window != internalWinId())
		break;

	    // Receiving an XEmbed message means the client
	    // is an XEmbed client.
	    d->clientIsXEmbed = true;

	    Time msgtime = (Time) event->xclient.data.l[0];
	    if (msgtime > X11->time)
		X11->time = msgtime;

	    switch (event->xclient.data.l[1]) {
	    case XEMBED_REQUEST_FOCUS: {
		// This typically happens when the client gets focus
		// because of a mouse click.
		if (!hasFocus())
		    setFocus(Qt::OtherFocusReason);

		// The message is passed along to the topmost container
		// that eventually responds with a XEMBED_FOCUS_IN
		// message. The focus in message is passed all the way
		// back until it reaches the original focus
		// requestor. In the end, not only the original client
		// has focus, but also all its ancestor containers.
		if (d->isEmbedded()) {
                    // If our window's embedded flag is set, then
		    // that suggests that we are part of a client. The
		    // parentWinId will then point to an container to whom
		    // we must pass this message.
		    sendXEmbedMessage(d->topLevelParentWinId(), x11Info().display(), XEMBED_REQUEST_FOCUS);
		} else {
                    // Our window's embedded flag is not set,
		    // so we are the topmost container. We respond to
		    // the focus request message with a focus in
		    // message. This message will pass on from client
		    // to container to client until it reaches the
		    // originator of the XEMBED_REQUEST_FOCUS message.
		    sendXEmbedMessage(d->client, x11Info().display(), XEMBED_FOCUS_IN, XEMBED_FOCUS_CURRENT);
		}

		break;
	    }
	    case XEMBED_FOCUS_NEXT:
		// Client sends this event when it received a tab
		// forward and was at the end of its focus chain. If
		// we are the only widget in the focus chain, we send
		// ourselves a FocusIn event.
                if (d->focus_next != this) {
		    focusNextPrevChild(true);
                } else {
                    QFocusEvent event(QEvent::FocusIn, Qt::TabFocusReason);
                    qApp->sendEvent(this, &event);
                }

		break;
	    case XEMBED_FOCUS_PREV:
		// Client sends this event when it received a backtab
		// and was at the start of its focus chain. If we are
		// the only widget in the focus chain, we send
		// ourselves a FocusIn event.
                if (d->focus_next != this) {
		    focusNextPrevChild(false);
                } else {
                    QFocusEvent event(QEvent::FocusIn, Qt::BacktabFocusReason);
                    qApp->sendEvent(this, &event);
                }

		break;
	    default:
		break;
	    }
	}
    }
	break;
    case XButtonPress:
	if (!d->clientIsXEmbed) {
            setFocus(Qt::MouseFocusReason);
            XAllowEvents(x11Info().display(), ReplayPointer, CurrentTime);
            return true;
	}
	break;
    case XButtonRelease:
	if (!d->clientIsXEmbed)
            XAllowEvents(x11Info().display(), SyncPointer, CurrentTime);
	break;
    default:
	break;
    }

    return QWidget::x11Event(event);
}

/*! \internal

    Whenever the container is resized, we need to resize our client.
*/
void QX11EmbedContainer::resizeEvent(QResizeEvent *)
{
    Q_D(QX11EmbedContainer);
    if (d->client)
	XResizeWindow(x11Info().display(), d->client, width(), height());
}

/*! \internal

    We use the QShowEvent to signal to our client that we want it to
    map itself. We do this by changing its window property
    XEMBED_INFO. The client will get an X11 PropertyNotify.
*/
void QX11EmbedContainer::showEvent(QShowEvent *)
{
    Q_D(QX11EmbedContainer);
    if (d->client) {
        long data[] = {XEMBED_VERSION, XEMBED_MAPPED};
	XChangeProperty(x11Info().display(), d->client, ATOM(_XEMBED_INFO), ATOM(_XEMBED_INFO), 32,
			PropModeReplace, (unsigned char *) data, 2);
    }
}

/*! \internal

    We use the QHideEvent to signal to our client that we want it to
    unmap itself. We do this by changing its window property
    XEMBED_INFO. The client will get an X11 PropertyNotify.
*/
void QX11EmbedContainer::hideEvent(QHideEvent *)
{
    Q_D(QX11EmbedContainer);
    if (d->client) {
        long data[] = {XEMBED_VERSION, XEMBED_MAPPED};
	XChangeProperty(x11Info().display(), d->client, ATOM(_XEMBED_INFO), ATOM(_XEMBED_INFO), 32,
			PropModeReplace, (unsigned char *) data, 2);
    }
}

/*!
    \reimp
*/
bool QX11EmbedContainer::event(QEvent *event)
{
    if (event->type() == QEvent::ParentChange) {
        XSelectInput(x11Info().display(), internalWinId(),
                     KeyPressMask | KeyReleaseMask
                     | ButtonPressMask | ButtonReleaseMask | ButtonMotionMask
                     | KeymapStateMask
                     | PointerMotionMask
                     | EnterWindowMask | LeaveWindowMask
                     | FocusChangeMask
                     | ExposureMask
                     | StructureNotifyMask
                     | SubstructureNotifyMask);
    }
    return QWidget::event(event);
}

/*! \internal

    Rejects a client window by reparenting it to the root window.  The
    client will receive a reparentnotify, and will most likely assume
    that the container has shut down. The XEmbed protocol does not
    define any way to reject a client window, but this is a clean way
    to do it.
*/
void QX11EmbedContainerPrivate::rejectClient(WId window)
{
    Q_Q(QX11EmbedContainer);
    q->setEnabled(false);
    XRemoveFromSaveSet(q->x11Info().display(), client);
    XReparentWindow(q->x11Info().display(), window, q->x11Info().appRootWindow(), 0, 0);
}

/*! \internal

    Accepts a client by mapping it, resizing it and optionally
    activating and giving it logical focusing through XEMBED messages.
*/
void QX11EmbedContainerPrivate::acceptClient(WId window)
{
    Q_Q(QX11EmbedContainer);
    client = window;
    q->setEnabled(true);

    // This tells Qt that we wish to forward DnD messages to
    // our client.
    if (!extra)
        createExtra();
    extraData()->xDndProxy = client;

    unsigned int version = XEmbedVersion();

    Atom actual_type_return;
    int actual_format_return;
    unsigned long nitems_return = 0;
    unsigned long bytes_after_return;
    unsigned char *prop_return = 0;
    unsigned int clientversion = 0;

    // Add this client to our saveset, so if we crash, the client window
    // doesn't get destroyed. This is useful for containers that restart
    // automatically after a crash, because it can simply reembed its clients
    // without having to restart them (KDE panel).
    XAddToSaveSet(q->x11Info().display(), client);

    // XEmbed clients have an _XEMBED_INFO property in which we can
    // fetch the version
    if (XGetWindowProperty(q->x11Info().display(), client, ATOM(_XEMBED_INFO), 0, 2, false,
                           ATOM(_XEMBED_INFO), &actual_type_return, &actual_format_return,
                           &nitems_return, &bytes_after_return, &prop_return) == Success) {

	if (actual_type_return != None && actual_format_return != 0) {
	    // Clients with the _XEMBED_INFO property are XEMBED clients.
	    clientIsXEmbed = true;

	    unsigned int *p = (unsigned int *)prop_return;
	    if (nitems_return >= 2)
		clientversion = p[0];
	}

	XFree(prop_return);
    }

    // Store client window's original size and placement.
    Window root;
    int x_return, y_return;
    unsigned int width_return, height_return, border_width_return, depth_return;
    XGetGeometry(q->x11Info().display(), client, &root, &x_return, &y_return,
		 &width_return, &height_return, &border_width_return, &depth_return);
    clientOriginalRect.setCoords(x_return, y_return,
				 x_return + width_return - 1,
				 y_return + height_return - 1);

    // Ask the client for its minimum size.
    XSizeHints size;
    long msize;
    if (XGetWMNormalHints(q->x11Info().display(), client, &size, &msize) && (size.flags & PMinSize)) {
	wmMinimumSizeHint = QSize(size.min_width, size.min_height);
        q->updateGeometry();
    }

    // The container should set the data2 field to the lowest of its
    // supported version number and that of the client (from
    // _XEMBED_INFO property).
    unsigned int minversion = version > clientversion ? clientversion : version;
    sendXEmbedMessage(client, q->x11Info().display(), XEMBED_EMBEDDED_NOTIFY, q->internalWinId(), minversion);
    XMapWindow(q->x11Info().display(), client);

    // Resize it, but no smaller than its minimum size hint.
    XResizeWindow(q->x11Info().display(),
                  client,
                  qMax(q->width(), wmMinimumSizeHint.width()),
                  qMax(q->height(), wmMinimumSizeHint.height()));
    q->update();

    // Not mentioned in the protocol is that if the container
    // is already active, the client must be activated to work
    // properly.
    if (q->window()->isActiveWindow())
	sendXEmbedMessage(client, q->x11Info().display(), XEMBED_WINDOW_ACTIVATE);

    // Also, if the container already has focus, then it must
    // send a focus in message to its new client; otherwise we ask
    // it to remove focus.
    if (q->focusWidget() == q && q->hasFocus())
	sendXEmbedMessage(client, q->x11Info().display(), XEMBED_FOCUS_IN, XEMBED_FOCUS_FIRST);
    else
	sendXEmbedMessage(client, q->x11Info().display(), XEMBED_FOCUS_OUT);

    if (!clientIsXEmbed) {
        checkGrab();
        if (q->hasFocus()) {
            XSetInputFocus(q->x11Info().display(), client, XRevertToParent, x11Time());
        } else {
            if (!isEmbedded())
                moveInputToProxy();
        }
    }

    emit q->clientIsEmbedded();
}

/*! \internal

    Moves X11 keyboard input focus to the focusProxy, unless the focus
    is there already. When X11 keyboard input focus is on the
    focusProxy, which is a child of the container and a sibling of the
    client, X11 keypresses and keyreleases will always go to the proxy
    and not to the client.
*/
void QX11EmbedContainerPrivate::moveInputToProxy()
{
    Q_Q(QX11EmbedContainer);
    WId focus;
    int revert_to;
    XGetInputFocus(q->x11Info().display(), &focus, &revert_to);
    if (focus != focusProxy->internalWinId())
        XSetInputFocus(q->x11Info().display(), focusProxy->internalWinId(), XRevertToParent, x11Time());
}

/*! \internal

    Ask the window manager to give us a default minimum size.
*/
QSize QX11EmbedContainer::minimumSizeHint() const
{
    Q_D(const QX11EmbedContainer);
    if (!d->client || !d->wmMinimumSizeHint.isValid())
	return QWidget::minimumSizeHint();
    return d->wmMinimumSizeHint;
}

/*! \internal

*/
void QX11EmbedContainerPrivate::checkGrab()
{
    Q_Q(QX11EmbedContainer);
    if (!clientIsXEmbed && q->isActiveWindow() && !q->hasFocus()) {
        if (!xgrab) {
            XGrabButton(q->x11Info().display(), AnyButton, AnyModifier, q->internalWinId(),
                        true, ButtonPressMask, GrabModeSync, GrabModeAsync,
                        None, None);
        }
        xgrab = true;
    } else {
	if (xgrab)
	    XUngrabButton(q->x11Info().display(), AnyButton, AnyModifier, q->internalWinId());
        xgrab = false;
    }
}

/*!
    Detaches the client from the embedder. The client will appear as a
    standalone window on the desktop.
*/
void QX11EmbedContainer::discardClient()
{
    Q_D(QX11EmbedContainer);
    if (d->client) {
	XResizeWindow(x11Info().display(), d->client, d->clientOriginalRect.width(),
		      d->clientOriginalRect.height());

	d->rejectClient(d->client);
    }
}

QT_END_NAMESPACE