summaryrefslogtreecommitdiffstats
path: root/win/tkWinX.c
blob: 1f9ad89cbcb42c7f742c6f3c61adacc4e3b40c12 (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
/*
 * tkWinX.c --
 *
 *	This file contains Windows emulation procedures for X routines.
 *
 * Copyright (c) 1995-1996 Sun Microsystems, Inc.
 * Copyright (c) 1994 Software Research Associates, Inc.
 * Copyright (c) 1998-2000 by Scriptics Corporation.
 *
 * See the file "license.terms" for information on usage and redistribution of
 * this file, and for a DISCLAIMER OF ALL WARRANTIES.
 */

#include "tkWinInt.h"

/*
 * The w32api 1.1 package (included in Mingw 1.1) does not define _WIN32_IE by
 * default. Define it here to gain access to the InitCommonControlsEx API in
 * commctrl.h.
 */

#ifndef _WIN32_IE
#define _WIN32_IE 0x0550 /* IE 5.5 */
#endif

#include <commctrl.h>
#ifdef _MSC_VER
#   pragma comment (lib, "comctl32.lib")
#   pragma comment (lib, "advapi32.lib")
#endif

/*
 * The zmouse.h file includes the definition for WM_MOUSEWHEEL.
 */

#include <zmouse.h>

/*
 * imm.h is needed by HandleIMEComposition
 */

#include <imm.h>
#ifdef _MSC_VER
#   pragma comment (lib, "imm32.lib")
#endif

/*
 * WM_UNICHAR is a message for Unicode input on all windows systems.
 * Perhaps this definition should be moved in another file.
 */
#ifndef WM_UNICHAR
#define WM_UNICHAR     0x0109
#define UNICODE_NOCHAR 0xFFFF
#endif

/*
 * Declarations of static variables used in this file.
 */

static const char winScreenName[] = ":0"; /* Default name of windows display. */
static HINSTANCE tkInstance = NULL;	/* Application instance handle. */
static int childClassInitialized;	/* Registered child class? */
static WNDCLASS childClass;		/* Window class for child windows. */
static int tkPlatformId = 0;		/* version of Windows platform */
static int tkWinTheme = 0;		/* See TkWinGetPlatformTheme */
static Tcl_Encoding keyInputEncoding = NULL;
					/* The current character encoding for
					 * keyboard input */
static int keyInputCharset = -1;	/* The Win32 CHARSET for the keyboard
					 * encoding */
static Tcl_Encoding unicodeEncoding = NULL;
					/* The UNICODE encoding */

/*
 * Thread local storage. Notice that now each thread must have its own
 * TkDisplay structure, since this structure contains most of the thread-
 * specific date for threads.
 */

typedef struct ThreadSpecificData {
    TkDisplay *winDisplay;	/* TkDisplay structure that represents Windows
				 * screen. */
    int updatingClipboard;	/* If 1, we are updating the clipboard. */
} ThreadSpecificData;
static Tcl_ThreadDataKey dataKey;

/*
 * Forward declarations of functions used in this file.
 */

static void		GenerateXEvent(HWND hwnd, UINT message,
			    WPARAM wParam, LPARAM lParam);
static unsigned int	GetState(UINT message, WPARAM wParam, LPARAM lParam);
static void 		GetTranslatedKey(XKeyEvent *xkey);
static void		UpdateInputLanguage(int charset);
static int		HandleIMEComposition(HWND hwnd, LPARAM lParam);

/*
 *----------------------------------------------------------------------
 *
 * TkGetServerInfo --
 *
 *	Given a window, this function returns information about the window
 *	server for that window. This function provides the guts of the "winfo
 *	server" command.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

void
TkGetServerInfo(
    Tcl_Interp *interp,		/* The server information is returned in this
				 * interpreter's result. */
    Tk_Window tkwin)		/* Token for window; this selects a particular
				 * display and server. */
{
    static char buffer[32]; /* Empty string means not initialized yet. */
    OSVERSIONINFOW os;

    if (!buffer[0]) {
	HANDLE handle = LoadLibraryW(L"NTDLL");
	int(__stdcall *getversion)(void *) =
		(int(__stdcall *)(void *))GetProcAddress(handle, "RtlGetVersion");
	os.dwOSVersionInfoSize = sizeof(OSVERSIONINFOW);
	if (!getversion || getversion(&os)) {
	    GetVersionExW(&os);
	}
	if (handle) {
	    FreeLibrary(handle);
	}
	/* Write the first character last, preventing multi-thread issues. */
	sprintf(buffer+1, "indows %d.%d %d %s", (int)os.dwMajorVersion,
		(int)os.dwMinorVersion, (int)os.dwBuildNumber,
#ifdef _WIN64
		"Win64"
#else
		"Win32"
#endif
	);
	buffer[0] = 'W';
    }
    Tcl_AppendResult(interp, buffer, NULL);
}

/*
 *----------------------------------------------------------------------
 *
 * Tk_GetHINSTANCE --
 *
 *	Retrieves the global instance handle used by the Tk library.
 *
 * Results:
 *	Returns the global instance handle.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

HINSTANCE
Tk_GetHINSTANCE(void)
{
    if (tkInstance == NULL) {
	tkInstance = GetModuleHandle(NULL);
    }
    return tkInstance;
}

/*
 *----------------------------------------------------------------------
 *
 * TkWinSetHINSTANCE --
 *
 *	Sets the global instance handle used by the Tk library. This should be
 *	called by DllMain.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

void
TkWinSetHINSTANCE(
    HINSTANCE hInstance)
{
    tkInstance = hInstance;
}

/*
 *----------------------------------------------------------------------
 *
 * TkWinXInit --
 *
 *	Initialize Xlib emulation layer.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Sets up various data structures.
 *
 *----------------------------------------------------------------------
 */

void
TkWinXInit(
    HINSTANCE hInstance)
{
    INITCOMMONCONTROLSEX comctl;
    CHARSETINFO lpCs;
    DWORD lpCP;

    if (childClassInitialized != 0) {
	return;
    }
    childClassInitialized = 1;

    comctl.dwSize = sizeof(INITCOMMONCONTROLSEX);
    comctl.dwICC = ICC_WIN95_CLASSES;
    if (!InitCommonControlsEx(&comctl)) {
	Tcl_Panic("Unable to load common controls?!");
    }

    childClass.style = CS_HREDRAW | CS_VREDRAW;
    childClass.cbClsExtra = 0;
    childClass.cbWndExtra = 0;
    childClass.hInstance = hInstance;
    childClass.hbrBackground = NULL;
    childClass.lpszMenuName = NULL;

    /*
     * Register the Child window class.
     */

    childClass.lpszClassName = TK_WIN_CHILD_CLASS_NAME;
    childClass.lpfnWndProc = TkWinChildProc;
    childClass.hIcon = NULL;
    childClass.hCursor = NULL;

    if (!RegisterClass(&childClass)) {
	Tcl_Panic("Unable to register TkChild class");
    }

    /*
     * Initialize input language info
     */

    if (GetLocaleInfo(LANGIDFROMLCID(PTR2INT(GetKeyboardLayout(0))),
	       LOCALE_IDEFAULTANSICODEPAGE | LOCALE_RETURN_NUMBER,
	       (LPTSTR) &lpCP, sizeof(lpCP)/sizeof(TCHAR))
	    && TranslateCharsetInfo(INT2PTR(lpCP), &lpCs, TCI_SRCCODEPAGE)) {
	UpdateInputLanguage((int) lpCs.ciCharset);
    }

    /*
     * Make sure we cleanup on finalize.
     */

    TkCreateExitHandler(TkWinXCleanup, (ClientData) hInstance);
}

/*
 *----------------------------------------------------------------------
 *
 * TkWinXCleanup --
 *
 *	Removes the registered classes for Tk.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Removes window classes from the system.
 *
 *----------------------------------------------------------------------
 */

void
TkWinXCleanup(
    ClientData clientData)
{
    HINSTANCE hInstance = (HINSTANCE) clientData;

    /*
     * Clean up our own class.
     */

    if (childClassInitialized) {
	childClassInitialized = 0;
	UnregisterClass(TK_WIN_CHILD_CLASS_NAME, hInstance);
    }

    if (unicodeEncoding != NULL) {
	Tcl_FreeEncoding(unicodeEncoding);
	unicodeEncoding = NULL;
    }

    /*
     * And let the window manager clean up its own class(es).
     */

    TkWinWmCleanup(hInstance);
    TkWinCleanupContainerList();
}

/*
 *----------------------------------------------------------------------
 *
 * TkWinGetPlatformId --
 *
 *	Determines whether running under NT, 95, or Win32s, to allow runtime
 *	conditional code. Win32s is no longer supported.
 *
 * Results:
 *	The return value is one of:
 *		VER_PLATFORM_WIN32s	   Win32s on Windows 3.1 (not supported)
 *		VER_PLATFORM_WIN32_WINDOWS Win32 on Windows 95, 98, ME (not supported)
 *		VER_PLATFORM_WIN32_NT	Win32 on Windows XP, Vista, Windows 7, Windows 8
 *		VER_PLATFORM_WIN32_CE	Win32 on Windows CE
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

int
TkWinGetPlatformId(void)
{
    if (tkPlatformId == 0) {
	OSVERSIONINFOW os;

	os.dwOSVersionInfoSize = sizeof(OSVERSIONINFOW);
	GetVersionExW(&os);
	tkPlatformId = os.dwPlatformId;

	/*
	 * Set tkWinTheme to be TK_THEME_WIN_XP or TK_THEME_WIN_CLASSIC. The
	 * TK_THEME_WIN_CLASSIC could be set even when running under XP if the
	 * windows classic theme was selected.
	 */

	if ((os.dwPlatformId == VER_PLATFORM_WIN32_NT) &&
		(os.dwMajorVersion == 5 && os.dwMinorVersion == 1)) {
	    HKEY hKey;
	    LPCTSTR szSubKey = TEXT("Control Panel\\Appearance");
	    LPCTSTR szCurrent = TEXT("Current");
	    DWORD dwSize = 200;
	    char pBuffer[200];

	    memset(pBuffer, 0, dwSize);
	    if (RegOpenKeyEx(HKEY_CURRENT_USER, szSubKey, 0L,
		    KEY_READ, &hKey) != ERROR_SUCCESS) {
		tkWinTheme = TK_THEME_WIN_XP;
	    } else {
		RegQueryValueEx(hKey, szCurrent, NULL, NULL, (LPBYTE) pBuffer, &dwSize);
		RegCloseKey(hKey);
		if (strcmp(pBuffer, "Windows Standard") == 0) {
		    tkWinTheme = TK_THEME_WIN_CLASSIC;
		} else {
		    tkWinTheme = TK_THEME_WIN_XP;
		}
	    }
	} else {
	    tkWinTheme = TK_THEME_WIN_CLASSIC;
	}
    }
    return tkPlatformId;
}

/*
 *----------------------------------------------------------------------
 *
 * TkWinGetPlatformTheme --
 *
 *	Return the Windows drawing style we should be using.
 *
 * Results:
 *	The return value is one of:
 *	    TK_THEME_WIN_CLASSIC	95/98/NT or XP in classic mode
 *	    TK_THEME_WIN_XP		XP not in classic mode
 *
 * Side effects:
 *	Could invoke TkWinGetPlatformId.
 *
 *----------------------------------------------------------------------
 */

int
TkWinGetPlatformTheme(void)
{
    if (tkPlatformId == 0) {
	TkWinGetPlatformId();
    }
    return tkWinTheme;
}

/*
 *----------------------------------------------------------------------
 *
 * TkGetDefaultScreenName --
 *
 *	Returns the name of the screen that Tk should use during
 *	initialization.
 *
 * Results:
 *	Returns a statically allocated string.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

const char *
TkGetDefaultScreenName(
    Tcl_Interp *interp,		/* Not used. */
    const char *screenName)	/* If NULL, use default string. */
{
    if ((screenName == NULL) || (screenName[0] == '\0')) {
	screenName = winScreenName;
    }
    return screenName;
}

/*
 *----------------------------------------------------------------------
 *
 * TkWinDisplayChanged --
 *
 *	Called to set up initial screen info or when an event indicated
 *	display (screen) change.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	May change info regarding the screen.
 *
 *----------------------------------------------------------------------
 */

void
TkWinDisplayChanged(
    Display *display)
{
    HDC dc;
    Screen *screen;

    if (display == NULL || display->screens == NULL) {
	return;
    }
    screen = display->screens;

    dc = GetDC(NULL);
    screen->width = GetDeviceCaps(dc, HORZRES);
    screen->height = GetDeviceCaps(dc, VERTRES);
    screen->mwidth = MulDiv(screen->width, 254,
	    GetDeviceCaps(dc, LOGPIXELSX) * 10);
    screen->mheight = MulDiv(screen->height, 254,
	    GetDeviceCaps(dc, LOGPIXELSY) * 10);

    /*
     * On windows, when creating a color bitmap, need two pieces of
     * information: the number of color planes and the number of pixels per
     * plane. Need to remember both quantities so that when constructing an
     * HBITMAP for offscreen rendering, we can specify the correct value for
     * the number of planes. Otherwise the HBITMAP won't be compatible with
     * the HWND and we'll just get blank spots copied onto the screen.
     */

    screen->ext_data = INT2PTR(GetDeviceCaps(dc, PLANES));
    screen->root_depth = GetDeviceCaps(dc, BITSPIXEL) * PTR2INT(screen->ext_data);

    if (screen->root_visual != NULL) {
	ckfree(screen->root_visual);
    }
    screen->root_visual = ckalloc(sizeof(Visual));
    screen->root_visual->visualid = 0;
    if (GetDeviceCaps(dc, RASTERCAPS) & RC_PALETTE) {
	screen->root_visual->map_entries = GetDeviceCaps(dc, SIZEPALETTE);
	screen->root_visual->class = PseudoColor;
	screen->root_visual->red_mask = 0x0;
	screen->root_visual->green_mask = 0x0;
	screen->root_visual->blue_mask = 0x0;
    } else if (screen->root_depth == 4) {
	screen->root_visual->class = StaticColor;
	screen->root_visual->map_entries = 16;
    } else if (screen->root_depth == 8) {
	screen->root_visual->class = StaticColor;
	screen->root_visual->map_entries = 256;
    } else if (screen->root_depth == 12) {
	screen->root_visual->class = TrueColor;
	screen->root_visual->map_entries = 32;
	screen->root_visual->red_mask = 0xf0;
	screen->root_visual->green_mask = 0xf000;
	screen->root_visual->blue_mask = 0xf00000;
    } else if (screen->root_depth == 16) {
	screen->root_visual->class = TrueColor;
	screen->root_visual->map_entries = 64;
	screen->root_visual->red_mask = 0xf8;
	screen->root_visual->green_mask = 0xfc00;
	screen->root_visual->blue_mask = 0xf80000;
    } else if (screen->root_depth >= 24) {
	screen->root_visual->class = TrueColor;
	screen->root_visual->map_entries = 256;
	screen->root_visual->red_mask = 0xff;
	screen->root_visual->green_mask = 0xff00;
	screen->root_visual->blue_mask = 0xff0000;
    }
    screen->root_visual->bits_per_rgb = screen->root_depth;
    ReleaseDC(NULL, dc);

    if (screen->cmap != None) {
	XFreeColormap(display, screen->cmap);
    }
    screen->cmap = XCreateColormap(display, None, screen->root_visual,
	    AllocNone);
}

/*
 *----------------------------------------------------------------------
 *
 * TkpOpenDisplay --
 *
 *	Create the Display structure and fill it with device specific
 *	information.
 *
 * Results:
 *	Returns a TkDisplay structure on success or NULL on failure.
 *
 * Side effects:
 *	Allocates a new TkDisplay structure.
 *
 *----------------------------------------------------------------------
 */

TkDisplay *
TkpOpenDisplay(
    const char *display_name)
{
    Screen *screen;
    TkWinDrawable *twdPtr;
    Display *display;
    ThreadSpecificData *tsdPtr =
	    Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));

    if (tsdPtr->winDisplay != NULL) {
	if (!strcmp(tsdPtr->winDisplay->display->display_name, display_name)) {
	    return tsdPtr->winDisplay;
	} else {
	    return NULL;
	}
    }

    display = ckalloc(sizeof(Display));
    ZeroMemory(display, sizeof(Display));

    display->display_name = ckalloc(strlen(display_name) + 1);
    strcpy(display->display_name, display_name);

    display->cursor_font = 1;
    display->nscreens = 1;
    display->request = 1;
    display->qlen = 0;

    screen = ckalloc(sizeof(Screen));
    ZeroMemory(screen, sizeof(Screen));
    screen->display = display;

    /*
     * Set up the root window.
     */

    twdPtr = ckalloc(sizeof(TkWinDrawable));
    if (twdPtr == NULL) {
	return None;
    }
    twdPtr->type = TWD_WINDOW;
    twdPtr->window.winPtr = NULL;
    twdPtr->window.handle = NULL;
    screen->root = (Window)twdPtr;

    /*
     * Note that these pixel values are not palette relative.
     */

    screen->white_pixel = RGB(255, 255, 255);
    screen->black_pixel = RGB(0, 0, 0);
    screen->cmap = None;

    display->screens		= screen;
    display->nscreens		= 1;
    display->default_screen	= 0;

    TkWinDisplayChanged(display);

    tsdPtr->winDisplay = ckalloc(sizeof(TkDisplay));
    ZeroMemory(tsdPtr->winDisplay, sizeof(TkDisplay));
    tsdPtr->winDisplay->display = display;
    tsdPtr->updatingClipboard = FALSE;

    return tsdPtr->winDisplay;
}

/*
 *----------------------------------------------------------------------
 *
 * TkpCloseDisplay --
 *
 *	Closes and deallocates a Display structure created with the
 *	TkpOpenDisplay function.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Frees up memory.
 *
 *----------------------------------------------------------------------
 */

void
TkpCloseDisplay(
    TkDisplay *dispPtr)
{
    Display *display = dispPtr->display;
    ThreadSpecificData *tsdPtr = (ThreadSpecificData *)
	    Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));

    if (dispPtr != tsdPtr->winDisplay) {
	Tcl_Panic("TkpCloseDisplay: tried to call TkpCloseDisplay on another display");
	return; /* not reached */
    }

    tsdPtr->winDisplay = NULL;

    if (display->display_name != NULL) {
	ckfree(display->display_name);
    }
    if (display->screens != NULL) {
	if (display->screens->root_visual != NULL) {
	    ckfree(display->screens->root_visual);
	}
	if (display->screens->root != None) {
	    ckfree(display->screens->root);
	}
	if (display->screens->cmap != None) {
	    XFreeColormap(display, display->screens->cmap);
	}
	ckfree(display->screens);
    }
    ckfree(display);
}

/*
 *----------------------------------------------------------------------
 *
 * TkClipCleanup --
 *
 *	This function is called to cleanup resources associated with claiming
 *	clipboard ownership and for receiving selection get results. This
 *	function is called in tkWindow.c. This has to be called by the display
 *	cleanup function because we still need the access display elements.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Resources are freed - the clipboard may no longer be used.
 *
 *----------------------------------------------------------------------
 */

void
TkClipCleanup(
    TkDisplay *dispPtr)		/* Display associated with clipboard. */
{
    if (dispPtr->clipWindow != NULL) {
	/*
	 * Force the clipboard to be rendered if we are the clipboard owner.
	 */

	HWND hwnd = Tk_GetHWND(Tk_WindowId(dispPtr->clipWindow));

	if (GetClipboardOwner() == hwnd) {
	    OpenClipboard(hwnd);
	    EmptyClipboard();
	    TkWinClipboardRender(dispPtr, CF_TEXT);
	    CloseClipboard();
	}

	Tk_DeleteSelHandler(dispPtr->clipWindow, dispPtr->clipboardAtom,
		dispPtr->applicationAtom);
	Tk_DeleteSelHandler(dispPtr->clipWindow, dispPtr->clipboardAtom,
		dispPtr->windowAtom);

	Tk_DestroyWindow(dispPtr->clipWindow);
	Tcl_Release((ClientData) dispPtr->clipWindow);
	dispPtr->clipWindow = NULL;
    }
}

/*
 *----------------------------------------------------------------------
 *
 * XBell --
 *
 *	Generate a beep.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Plays a sounds out the system speakers.
 *
 *----------------------------------------------------------------------
 */

int
XBell(
    Display *display,
    int percent)
{
    MessageBeep(MB_OK);
    return Success;
}

/*
 *----------------------------------------------------------------------
 *
 * TkWinChildProc --
 *
 *	Callback from Windows whenever an event occurs on a child window.
 *
 * Results:
 *	Standard Windows return value.
 *
 * Side effects:
 *	May process events off the Tk event queue.
 *
 *----------------------------------------------------------------------
 */

LRESULT CALLBACK
TkWinChildProc(
    HWND hwnd,
    UINT message,
    WPARAM wParam,
    LPARAM lParam)
{
    LRESULT result;

    switch (message) {
    case WM_INPUTLANGCHANGE:
	UpdateInputLanguage((int) wParam);
	result = 1;
	break;

    case WM_IME_COMPOSITION:
	result = 0;
	if (HandleIMEComposition(hwnd, lParam) == 0) {
	    result = DefWindowProc(hwnd, message, wParam, lParam);
	}
	break;

    case WM_SETCURSOR:
	/*
	 * Short circuit the WM_SETCURSOR message since we set the cursor
	 * elsewhere.
	 */

	result = TRUE;
	break;

    case WM_CREATE:
    case WM_ERASEBKGND:
	result = 0;
	break;

    case WM_PAINT:
	GenerateXEvent(hwnd, message, wParam, lParam);
	result = DefWindowProc(hwnd, message, wParam, lParam);
	break;

    case TK_CLAIMFOCUS:
    case TK_GEOMETRYREQ:
    case TK_ATTACHWINDOW:
    case TK_DETACHWINDOW:
    case TK_ICONIFY:
    case TK_DEICONIFY:
    case TK_MOVEWINDOW:
    case TK_WITHDRAW:
    case TK_RAISEWINDOW:
    case TK_GETFRAMEWID:
    case TK_OVERRIDEREDIRECT:
    case TK_SETMENU:
    case TK_STATE:
    case TK_INFO:
	result = TkWinEmbeddedEventProc(hwnd, message, wParam, lParam);
	break;

    case WM_UNICHAR:
        if (wParam == UNICODE_NOCHAR) {
	    /* If wParam is UNICODE_NOCHAR and the application processes
	     * this message, then return TRUE. */
	    result = 1;
	} else {
	    /* If the event was translated, we must return 0 */
            if (Tk_TranslateWinEvent(hwnd, message, wParam, lParam, &result)) {
                result = 0;
	    } else {
	        result = 1;
	    }
	}
	break;

    default:
	if (!Tk_TranslateWinEvent(hwnd, message, wParam, lParam, &result)) {
	    result = DefWindowProc(hwnd, message, wParam, lParam);
	}
	break;
    }

    /*
     * Handle any newly queued events before returning control to Windows.
     */

    Tcl_ServiceAll();
    return result;
}

/*
 *----------------------------------------------------------------------
 *
 * Tk_TranslateWinEvent --
 *
 *	This function is called by widget window functions to handle the
 *	translation from Win32 events to Tk events.
 *
 * Results:
 *	Returns 1 if the event was handled, else 0.
 *
 * Side effects:
 *	Depends on the event.
 *
 *----------------------------------------------------------------------
 */

int
Tk_TranslateWinEvent(
    HWND hwnd,
    UINT message,
    WPARAM wParam,
    LPARAM lParam,
    LRESULT *resultPtr)
{
    *resultPtr = 0;
    switch (message) {
    case WM_RENDERFORMAT: {
	TkWindow *winPtr = (TkWindow *) Tk_HWNDToWindow(hwnd);

	if (winPtr) {
	    TkWinClipboardRender(winPtr->dispPtr, wParam);
	}
	return 1;
    }

    case WM_COMMAND:
    case WM_NOTIFY:
    case WM_VSCROLL:
    case WM_HSCROLL: {
	/*
	 * Reflect these messages back to the sender so that they can be
	 * handled by the window proc for the control. Note that we need to be
	 * careful not to reflect a message that is targeted to this window,
	 * or we will loop.
	 */

	HWND target = (message == WM_NOTIFY)
		? ((NMHDR*)lParam)->hwndFrom : (HWND) lParam;

	if (target && target != hwnd) {
	    *resultPtr = SendMessage(target, message, wParam, lParam);
	    return 1;
	}
	break;
    }

    case WM_LBUTTONDOWN:
    case WM_LBUTTONDBLCLK:
    case WM_MBUTTONDOWN:
    case WM_MBUTTONDBLCLK:
    case WM_RBUTTONDOWN:
    case WM_RBUTTONDBLCLK:
    case WM_LBUTTONUP:
    case WM_MBUTTONUP:
    case WM_RBUTTONUP:
    case WM_MOUSEMOVE:
	Tk_PointerEvent(hwnd, (short) LOWORD(lParam), (short) HIWORD(lParam));
	return 1;

    case WM_CLOSE:
    case WM_SETFOCUS:
    case WM_KILLFOCUS:
    case WM_DESTROYCLIPBOARD:
    case WM_UNICHAR:
    case WM_CHAR:
    case WM_SYSKEYDOWN:
    case WM_SYSKEYUP:
    case WM_KEYDOWN:
    case WM_KEYUP:
    case WM_MOUSEWHEEL:
	GenerateXEvent(hwnd, message, wParam, lParam);
	return 1;
    case WM_MENUCHAR:
	GenerateXEvent(hwnd, message, wParam, lParam);

	/*
	 * MNC_CLOSE is the only one that looks right. This is a hack.
	 */

	*resultPtr = MAKELONG (0, MNC_CLOSE);
	return 1;
    }
    return 0;
}

/*
 *----------------------------------------------------------------------
 *
 * GenerateXEvent --
 *
 *	This routine generates an X event from the corresponding Windows
 *	event.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Queues one or more X events.
 *
 *----------------------------------------------------------------------
 */

static void
GenerateXEvent(
    HWND hwnd,
    UINT message,
    WPARAM wParam,
    LPARAM lParam)
{
    XEvent event;
    TkWindow *winPtr;
    ThreadSpecificData *tsdPtr = (ThreadSpecificData *)
	    Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));

    if (message == WM_MOUSEWHEEL) {
	union {LPARAM lParam; POINTS point;} root;
	POINT pos;
	root.lParam = lParam;

	/*
	 * Redirect mousewheel events to the window containing the cursor.
	 * That feels much less strange to users, and is how all the other
	 * platforms work.
	 */

	pos.x = root.point.x;
	pos.y = root.point.y;
	hwnd = WindowFromPoint(pos);
    }

    winPtr = (TkWindow *) Tk_HWNDToWindow(hwnd);
    if (!winPtr || winPtr->window == None) {
	return;
    }

    memset(&event, 0, sizeof(XEvent));
    event.xany.serial = winPtr->display->request++;
    event.xany.send_event = False;
    event.xany.display = winPtr->display;
    event.xany.window = winPtr->window;

    switch (message) {
    case WM_PAINT: {
	PAINTSTRUCT ps;

	event.type = Expose;
	BeginPaint(hwnd, &ps);
	event.xexpose.x = ps.rcPaint.left;
	event.xexpose.y = ps.rcPaint.top;
	event.xexpose.width = ps.rcPaint.right - ps.rcPaint.left;
	event.xexpose.height = ps.rcPaint.bottom - ps.rcPaint.top;
	EndPaint(hwnd, &ps);
	event.xexpose.count = 0;
	break;
    }

    case WM_CLOSE:
	event.type = ClientMessage;
	event.xclient.message_type =
		Tk_InternAtom((Tk_Window) winPtr, "WM_PROTOCOLS");
	event.xclient.format = 32;
	event.xclient.data.l[0] =
		Tk_InternAtom((Tk_Window) winPtr, "WM_DELETE_WINDOW");
	break;

    case WM_SETFOCUS:
    case WM_KILLFOCUS: {
	TkWindow *otherWinPtr = (TkWindow *) Tk_HWNDToWindow((HWND) wParam);

	/*
	 * Compare toplevel windows to avoid reporting focus changes within
	 * the same toplevel.
	 */

	while (!(winPtr->flags & TK_TOP_LEVEL)) {
	    winPtr = winPtr->parentPtr;
	    if (winPtr == NULL) {
		return;
	    }
	}
	while (otherWinPtr && !(otherWinPtr->flags & TK_TOP_LEVEL)) {
	    otherWinPtr = otherWinPtr->parentPtr;
	}

	/*
	 * Do a catch-all Tk_SetCaretPos here to make sure that the window
	 * receiving focus sets the caret at least once.
	 */

	if (message == WM_SETFOCUS) {
	    Tk_SetCaretPos((Tk_Window) winPtr, 0, 0, 0);
	}

	if (otherWinPtr == winPtr) {
	    return;
	}

	event.xany.window = winPtr->window;
	event.type = (message == WM_SETFOCUS) ? FocusIn : FocusOut;
	event.xfocus.mode = NotifyNormal;
	event.xfocus.detail = NotifyNonlinear;

	/*
	 * Destroy the caret if we own it. If we are moving to another Tk
	 * window, it will reclaim and reposition it with Tk_SetCaretPos.
	 */

	if (message == WM_KILLFOCUS) {
	    DestroyCaret();
	}
	break;
    }

    case WM_DESTROYCLIPBOARD:
	if (tsdPtr->updatingClipboard == TRUE) {
	    /*
	     * We want to avoid this event if we are the ones that caused this
	     * event.
	     */

	    return;
	}
	event.type = SelectionClear;
	event.xselectionclear.selection =
		Tk_InternAtom((Tk_Window)winPtr, "CLIPBOARD");
	event.xselectionclear.time = TkpGetMS();
	break;

    case WM_MOUSEWHEEL:
    case WM_CHAR:
    case WM_UNICHAR:
    case WM_SYSKEYDOWN:
    case WM_SYSKEYUP:
    case WM_KEYDOWN:
    case WM_KEYUP: {
	unsigned int state = GetState(message, wParam, lParam);
	Time time = TkpGetMS();
	POINT clientPoint;
	union {DWORD msgpos; POINTS point;} root;	/* Note: POINT and POINTS are different */

	/*
	 * Compute the screen and window coordinates of the event.
	 */

	root.msgpos = GetMessagePos();
	clientPoint.x = root.point.x;
	clientPoint.y = root.point.y;
	ScreenToClient(hwnd, &clientPoint);

	/*
	 * Set up the common event fields.
	 */

	event.xbutton.root = RootWindow(winPtr->display, winPtr->screenNum);
	event.xbutton.subwindow = None;
	event.xbutton.x = clientPoint.x;
	event.xbutton.y = clientPoint.y;
	event.xbutton.x_root = root.point.x;
	event.xbutton.y_root = root.point.y;
	event.xbutton.state = state;
	event.xbutton.time = time;
	event.xbutton.same_screen = True;

	/*
	 * Now set up event specific fields.
	 */

	switch (message) {
	case WM_MOUSEWHEEL:
	    /*
	     * We have invented a new X event type to handle this event. It
	     * still uses the KeyPress struct. However, the keycode field has
	     * been overloaded to hold the zDelta of the wheel. Set nbytes to
	     * 0 to prevent conversion of the keycode to a keysym in
	     * TkpGetString. [Bug 1118340].
	     */

	    event.type = MouseWheelEvent;
	    event.xany.send_event = -1;
	    event.xkey.nbytes = 0;
	    event.xkey.keycode = (short) HIWORD(wParam);
	    break;
	case WM_SYSKEYDOWN:
	case WM_KEYDOWN:
	    /*
	     * Check for translated characters in the event queue. Setting
	     * xany.send_event to -1 indicates to the Windows implementation
	     * of TkpGetString() that this event was generated by windows and
	     * that the Windows extension xkey.trans_chars is filled with the
	     * MBCS characters that came from the TranslateMessage call.
	     */

	    event.type = KeyPress;
	    event.xany.send_event = -1;
	    event.xkey.keycode = wParam;
	    GetTranslatedKey(&event.xkey);
	    break;

	case WM_SYSKEYUP:
	case WM_KEYUP:
	    /*
	     * We don't check for translated characters on keyup because Tk
	     * won't know what to do with them. Instead, we wait for the
	     * WM_CHAR messages which will follow.
	     */

	    event.type = KeyRelease;
	    event.xkey.keycode = wParam;
	    event.xkey.nbytes = 0;
	    break;

	case WM_CHAR:
	    /*
	     * Synthesize both a KeyPress and a KeyRelease. Strings generated
	     * by Input Method Editor are handled in the following manner:
	     * 1. A series of WM_KEYDOWN & WM_KEYUP messages that cause
	     *    GetTranslatedKey() to be called and return immediately
	     *    because the WM_KEYDOWNs have no associated WM_CHAR messages
	     *    -- the IME window is accumulating the characters and
	     *    translating them itself. In the "bind" command, you get an
	     *    event with a mystery keysym and %A == "" for each WM_KEYDOWN
	     *    that actually was meant for the IME.
	     * 2. A WM_KEYDOWN corresponding to the "confirm typing"
	     *    character. This causes GetTranslatedKey() to be called.
	     * 3. A WM_IME_NOTIFY message saying that the IME is done. A side
	     *	  effect of this message is that GetTranslatedKey() thinks
	     *	  this means that there are no WM_CHAR messages and returns
	     *	  immediately. In the "bind" command, you get an another event
	     *	  with a mystery keysym and %A == "".
	     * 4. A sequence of WM_CHAR messages that correspond to the
	     *	  characters in the IME window. A bunch of simulated
	     *	  KeyPress/KeyRelease events will be generated, one for each
	     *	  character. Adjacent WM_CHAR messages may actually specify
	     *	  the high and low bytes of a multi-byte character -- in that
	     *	  case the two WM_CHAR messages will be combined into one
	     *	  event. It is the event-consumer's responsibility to convert
	     *	  the string returned from XLookupString from system encoding
	     *	  to UTF-8.
	     * 5. And finally we get the WM_KEYUP for the "confirm typing"
	     *    character.
	     */

	    event.type = KeyPress;
	    event.xany.send_event = -1;
	    event.xkey.keycode = 0;
	    event.xkey.nbytes = 1;
	    event.xkey.trans_chars[0] = (char) wParam;

	    if (IsDBCSLeadByte((BYTE) wParam)) {
		MSG msg;

		if ((PeekMessage(&msg, NULL, 0, 0, PM_NOREMOVE) != 0)
			&& (msg.message == WM_CHAR)) {
		    GetMessage(&msg, NULL, 0, 0);
		    event.xkey.nbytes = 2;
		    event.xkey.trans_chars[1] = (char) msg.wParam;
		}
	    }
	    Tk_QueueWindowEvent(&event, TCL_QUEUE_TAIL);
	    event.type = KeyRelease;
	    break;

	case WM_UNICHAR: {
	    char buffer[XMaxTransChars];
	    int i;
	    event.type = KeyPress;
	    event.xany.send_event = -3;
	    event.xkey.keycode = wParam;
	    event.xkey.nbytes = Tcl_UniCharToUtf((int)wParam, buffer);
	    for (i=0; i<event.xkey.nbytes && i<XMaxTransChars; ++i) {
		event.xkey.trans_chars[i] = buffer[i];
	    }
	    Tk_QueueWindowEvent(&event, TCL_QUEUE_TAIL);
	    event.type = KeyRelease;
	    break;
	}

	}
	break;
    }

    default:
	/*
	 * Don't know how to translate this event, so ignore it. (It probably
	 * should not have got here, but ignoring it should be harmless.)
	 */

	return;
    }

    /*
     * Post the translated event to the main Tk event queue.
     */

    Tk_QueueWindowEvent(&event, TCL_QUEUE_TAIL);
}

/*
 *----------------------------------------------------------------------
 *
 * GetState --
 *
 *	This function constructs a state mask for the mouse buttons and
 *	modifier keys as they were before the event occured.
 *
 * Results:
 *	Returns a composite value of all the modifier and button state flags
 *	that were set at the time the event occurred.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

static unsigned int
GetState(
    UINT message,		/* Win32 message type */
    WPARAM wParam,		/* wParam of message, used if key message */
    LPARAM lParam)		/* lParam of message, used if key message */
{
    int mask;
    int prevState;		/* 1 if key was previously down */
    unsigned int state = TkWinGetModifierState();

    /*
     * If the event is a key press or release, we check for modifier keys so
     * we can report the state of the world before the event.
     */

    if (message == WM_SYSKEYDOWN || message == WM_KEYDOWN
	    || message == WM_SYSKEYUP || message == WM_KEYUP) {
	mask = 0;
	prevState = HIWORD(lParam) & KF_REPEAT;
	switch(wParam) {
	case VK_SHIFT:
	    mask = ShiftMask;
	    break;
	case VK_CONTROL:
	    mask = ControlMask;
	    break;
	case VK_MENU:
	    mask = ALT_MASK;
	    break;
	case VK_CAPITAL:
	    if (message == WM_SYSKEYDOWN || message == WM_KEYDOWN) {
		mask = LockMask;
		prevState = ((state & mask) ^ prevState) ? 0 : 1;
	    }
	    break;
	case VK_NUMLOCK:
	    if (message == WM_SYSKEYDOWN || message == WM_KEYDOWN) {
		mask = Mod1Mask;
		prevState = ((state & mask) ^ prevState) ? 0 : 1;
	    }
	    break;
	case VK_SCROLL:
	    if (message == WM_SYSKEYDOWN || message == WM_KEYDOWN) {
		mask = Mod3Mask;
		prevState = ((state & mask) ^ prevState) ? 0 : 1;
	    }
	    break;
	}
	if (prevState) {
	    state |= mask;
	} else {
	    state &= ~mask;
	}
	if (HIWORD(lParam) & KF_EXTENDED) {
	    state |= EXTENDED_MASK;
	}
    }
    return state;
}

/*
 *----------------------------------------------------------------------
 *
 * GetTranslatedKey --
 *
 *	Retrieves WM_CHAR messages that are placed on the system queue by the
 *	TranslateMessage system call and places them in the given KeyPress
 *	event.
 *
 * Results:
 *	Sets the trans_chars and nbytes member of the key event.
 *
 * Side effects:
 *	Removes any WM_CHAR messages waiting on the top of the system event
 *	queue.
 *
 *----------------------------------------------------------------------
 */

static void
GetTranslatedKey(
    XKeyEvent *xkey)
{
    MSG msg;

    xkey->nbytes = 0;

    while ((xkey->nbytes < XMaxTransChars)
	    && PeekMessageA(&msg, NULL, 0, 0, PM_NOREMOVE)) {
	if ((msg.message != WM_CHAR) && (msg.message != WM_SYSCHAR)) {
	    break;
	}

	GetMessageA(&msg, NULL, 0, 0);

	/*
	 * If this is a normal character message, we may need to strip off the
	 * Alt modifier (e.g. Alt-digits). Note that we don't want to do this
	 * for system messages, because those were presumably generated as an
	 * Alt-char sequence (e.g. accelerator keys).
	 */

	if ((msg.message == WM_CHAR) && (msg.lParam & 0x20000000)) {
	    xkey->state = 0;
	}
	xkey->trans_chars[xkey->nbytes] = (char) msg.wParam;
	xkey->nbytes++;

	if (((unsigned short) msg.wParam) > ((unsigned short) 0xff)) {
	    /*
	     * Some "addon" input devices, such as the popular PenPower
	     * Chinese writing pad, generate 16 bit values in WM_CHAR messages
	     * (instead of passing them in two separate WM_CHAR messages
	     * containing two 8-bit values.
	     */

	    xkey->trans_chars[xkey->nbytes] = (char) (msg.wParam >> 8);
	    xkey->nbytes ++;
	}
    }
}

/*
 *----------------------------------------------------------------------
 *
 * UpdateInputLanguage --
 *
 *	Gets called when a WM_INPUTLANGCHANGE message is received by the Tk
 *	child window function. This message is sent by the Input Method Editor
 *	system when the user chooses a different input method. All subsequent
 *	WM_CHAR messages will contain characters in the new encoding. We
 *	record the new encoding so that TkpGetString() knows how to correctly
 *	translate the WM_CHAR into unicode.
 *
 * Results:
 *	Records the new encoding in keyInputEncoding.
 *
 * Side effects:
 *	Old value of keyInputEncoding is freed.
 *
 *----------------------------------------------------------------------
 */

static void
UpdateInputLanguage(
    int charset)
{
    CHARSETINFO charsetInfo;
    Tcl_Encoding encoding;
    char codepage[4 + TCL_INTEGER_SPACE];

    if (keyInputCharset == charset) {
	return;
    }
    if (TranslateCharsetInfo(INT2PTR(charset), &charsetInfo,
	    TCI_SRCCHARSET) == 0) {
	/*
	 * Some mysterious failure.
	 */

	return;
    }

    wsprintfA(codepage, "cp%d", charsetInfo.ciACP);

    if ((encoding = Tcl_GetEncoding(NULL, codepage)) == NULL) {
	/*
	 * The encoding is not supported by Tcl.
	 */

	return;
    }

    if (keyInputEncoding != NULL) {
	Tcl_FreeEncoding(keyInputEncoding);
    }

    keyInputEncoding = encoding;
    keyInputCharset = charset;
}

/*
 *----------------------------------------------------------------------
 *
 * TkWinGetKeyInputEncoding --
 *
 *	Returns the current keyboard input encoding selected by the user (with
 *	WM_INPUTLANGCHANGE events).
 *
 * Results:
 *	The current keyboard input encoding.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

Tcl_Encoding
TkWinGetKeyInputEncoding(void)
{
    return keyInputEncoding;
}

/*
 *----------------------------------------------------------------------
 *
 * TkWinGetUnicodeEncoding --
 *
 *	Returns the cached unicode encoding.
 *
 * Results:
 *	The unicode encoding.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

Tcl_Encoding
TkWinGetUnicodeEncoding(void)
{
    if (unicodeEncoding == NULL) {
	unicodeEncoding = Tcl_GetEncoding(NULL, "unicode");
    }
    return unicodeEncoding;
}

/*
 *----------------------------------------------------------------------
 *
 * HandleIMEComposition --
 *
 *	This function works around a definciency in some versions of Windows
 *	2000 to make it possible to entry multi-lingual characters under all
 *	versions of Windows 2000.
 *
 *	When an Input Method Editor (IME) is ready to send input characters to
 *	an application, it sends a WM_IME_COMPOSITION message with the
 *	GCS_RESULTSTR. However, The DefWindowProc() on English Windows 2000
 *	arbitrarily converts all non-Latin-1 characters in the composition to
 *	"?".
 *
 *	This function correctly processes the composition data and sends the
 *	UNICODE values of the composed characters to TK's event queue.
 *
 * Results:
 *	If this function has processed the composition data, returns 1.
 *	Otherwise returns 0.
 *
 * Side effects:
 *	Key events are put into the TK event queue.
 *
 *----------------------------------------------------------------------
 */

static int
HandleIMEComposition(
    HWND hwnd,			/* Window receiving the message. */
    LPARAM lParam)		/* Flags for the WM_IME_COMPOSITION message */
{
    HIMC hIMC;
    int n;

    if ((lParam & GCS_RESULTSTR) == 0) {
	/*
	 * Composition is not finished yet.
	 */

	return 0;
    }

    hIMC = ImmGetContext(hwnd);
    if (!hIMC) {
	return 0;
    }

    n = ImmGetCompositionString(hIMC, GCS_RESULTSTR, NULL, 0);

    if (n > 0) {
	char *buff = ckalloc(n);
	TkWindow *winPtr;
	XEvent event;
	int i;

	n = ImmGetCompositionString(hIMC, GCS_RESULTSTR, buff, (unsigned) n);

	/*
	 * Set up the fields pertinent to key event.
	 *
	 * We set send_event to the special value of -2, so that TkpGetString
	 * in tkWinKey.c knows that trans_chars[] already contains a UNICODE
	 * char and there's no need to do encoding conversion.
	 *
	 * Note that the event *must* be zeroed out first; Tk plays cunning
	 * games with the overalls structure. [Bug 2992129]
	 */

	winPtr = (TkWindow *) Tk_HWNDToWindow(hwnd);

	memset(&event, 0, sizeof(XEvent));
	event.xkey.serial = winPtr->display->request++;
	event.xkey.send_event = -2;
	event.xkey.display = winPtr->display;
	event.xkey.window = winPtr->window;
	event.xkey.root = RootWindow(winPtr->display, winPtr->screenNum);
	event.xkey.subwindow = None;
	event.xkey.state = TkWinGetModifierState();
	event.xkey.time = TkpGetMS();
	event.xkey.same_screen = True;
	event.xkey.keycode = 0;
	event.xkey.nbytes = 2;

	for (i=0; i<n; ) {
	    /*
	     * Simulate a pair of KeyPress and KeyRelease events for each
	     * UNICODE character in the composition.
	     */

	    event.xkey.trans_chars[0] = (char) buff[i++];
	    event.xkey.trans_chars[1] = (char) buff[i++];

	    event.type = KeyPress;
	    Tk_QueueWindowEvent(&event, TCL_QUEUE_TAIL);

	    event.type = KeyRelease;
	    Tk_QueueWindowEvent(&event, TCL_QUEUE_TAIL);
	}

	ckfree(buff);
    }
    ImmReleaseContext(hwnd, hIMC);
    return 1;
}

/*
 *----------------------------------------------------------------------
 *
 * TkWinResendEvent --
 *
 *	This function converts an X event into a Windows event and invokes the
 *	specified windo function.
 *
 * Results:
 *	A standard Windows result.
 *
 * Side effects:
 *	Invokes the window function
 *
 *----------------------------------------------------------------------
 */

LRESULT
TkWinResendEvent(
    WNDPROC wndproc,
    HWND hwnd,
    XEvent *eventPtr)
{
    UINT msg;
    WPARAM wparam;
    LPARAM lparam;

    if (eventPtr->type != ButtonPress) {
	return 0;
    }

    switch (eventPtr->xbutton.button) {
    case Button1:
	msg = WM_LBUTTONDOWN;
	wparam = MK_LBUTTON;
	break;
    case Button2:
	msg = WM_MBUTTONDOWN;
	wparam = MK_MBUTTON;
	break;
    case Button3:
	msg = WM_RBUTTONDOWN;
	wparam = MK_RBUTTON;
	break;
    default:
	return 0;
    }

    if (eventPtr->xbutton.state & Button1Mask) {
	wparam |= MK_LBUTTON;
    }
    if (eventPtr->xbutton.state & Button2Mask) {
	wparam |= MK_MBUTTON;
    }
    if (eventPtr->xbutton.state & Button3Mask) {
	wparam |= MK_RBUTTON;
    }
    if (eventPtr->xbutton.state & ShiftMask) {
	wparam |= MK_SHIFT;
    }
    if (eventPtr->xbutton.state & ControlMask) {
	wparam |= MK_CONTROL;
    }
    lparam = MAKELPARAM((short) eventPtr->xbutton.x,
	    (short) eventPtr->xbutton.y);
    return CallWindowProc(wndproc, hwnd, msg, wparam, lparam);
}

/*
 *----------------------------------------------------------------------
 *
 * TkpGetMS --
 *
 *	Return a relative time in milliseconds. It doesn't matter when the
 *	epoch was.
 *
 * Results:
 *	Number of milliseconds.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

unsigned long
TkpGetMS(void)
{
    return GetTickCount();
}

/*
 *----------------------------------------------------------------------
 *
 * TkWinUpdatingClipboard --
 *
 *
 * Results:
 *	Number of milliseconds.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

void
TkWinUpdatingClipboard(
    int mode)
{
    ThreadSpecificData *tsdPtr = (ThreadSpecificData *)
	    Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));

    tsdPtr->updatingClipboard = mode;
}

/*
 *----------------------------------------------------------------------
 *
 * Tk_SetCaretPos --
 *
 *	This enables correct movement of focus in the MS Magnifier, as well as
 *	allowing us to correctly position the IME Window. The following Win32
 *	APIs are used to work with MS caret:
 *
 *	CreateCaret	DestroyCaret	SetCaretPos	GetCaretPos
 *
 *	Only one instance of caret can be active at any time (e.g.
 *	DestroyCaret API does not take any argument such as handle). Since
 *	do-it-right approach requires to track the create/destroy caret status
 *	all the time in a global scope among windows (or widgets), we just
 *	implement this minimal setup to get the job done.
 *
 * Results:
 *	None
 *
 * Side effects:
 *	Sets the global Windows caret position.
 *
 *----------------------------------------------------------------------
 */

void
Tk_SetCaretPos(
    Tk_Window tkwin,
    int x, int y,
    int height)
{
    static HWND caretHWND = NULL;
    TkCaret *caretPtr = &(((TkWindow *) tkwin)->dispPtr->caret);
    Window win;

    /*
     * Prevent processing anything if the values haven't changed. Windows only
     * has one display, so we can do this with statics.
     */

    if ((caretPtr->winPtr == ((TkWindow *) tkwin))
	    && (caretPtr->x == x) && (caretPtr->y == y)) {
	return;
    }

    caretPtr->winPtr = ((TkWindow *) tkwin);
    caretPtr->x = x;
    caretPtr->y = y;
    caretPtr->height = height;

    /*
     * We adjust to the toplevel to get the coords right, as setting the IME
     * composition window is based on the toplevel hwnd, so ignore height.
     */

    while (!Tk_IsTopLevel(tkwin)) {
	x += Tk_X(tkwin);
	y += Tk_Y(tkwin);
	tkwin = Tk_Parent(tkwin);
	if (tkwin == NULL) {
	    return;
	}
    }

    win = Tk_WindowId(tkwin);
    if (win) {
	HIMC hIMC;
	HWND hwnd = Tk_GetHWND(win);

	if (hwnd != caretHWND) {
	    DestroyCaret();
	    if (CreateCaret(hwnd, NULL, 0, 0)) {
		caretHWND = hwnd;
	    }
	}

	if (!SetCaretPos(x, y) && CreateCaret(hwnd, NULL, 0, 0)) {
	    caretHWND = hwnd;
	    SetCaretPos(x, y);
	}

	/*
	 * The IME composition window should be updated whenever the caret
	 * position is changed because a clause of the composition string may
	 * be converted to the final characters and the other clauses still
	 * stay on the composition window. -- yamamoto
	 */

	hIMC = ImmGetContext(hwnd);
	if (hIMC) {
	    COMPOSITIONFORM cform;

	    cform.dwStyle = CFS_POINT;
	    cform.ptCurrentPos.x = x;
	    cform.ptCurrentPos.y = y;
	    ImmSetCompositionWindow(hIMC, &cform);
	    ImmReleaseContext(hwnd, hIMC);
	}
    }
}

/*
 *----------------------------------------------------------------------
 *
 * Tk_GetUserInactiveTime --
 *
 *	Return the number of milliseconds the user was inactive.
 *
 * Results:
 *	Milliseconds of user inactive time or -1 if the user32.dll doesn't
 *	have the symbol GetLastInputInfo or GetLastInputInfo returns an error.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

long
Tk_GetUserInactiveTime(
     Display *dpy)		/* Ignored on Windows */
{
    LASTINPUTINFO li;

    li.cbSize = sizeof(li);
    if (!(BOOL)GetLastInputInfo(&li)) {
	return -1;
    }

    /*
     * Last input info is in milliseconds, since restart time.
     */

    return (GetTickCount()-li.dwTime);
}

/*
 *----------------------------------------------------------------------
 *
 * Tk_ResetUserInactiveTime --
 *
 *	Reset the user inactivity timer
 *
 * Results:
 *	none
 *
 * Side effects:
 *	The user inactivity timer of the underlaying windowing system is reset
 *	to zero.
 *
 *----------------------------------------------------------------------
 */

void
Tk_ResetUserInactiveTime(
    Display *dpy)
{
    INPUT inp;

    inp.type = INPUT_MOUSE;
    inp.mi.dx = 0;
    inp.mi.dy = 0;
    inp.mi.mouseData = 0;
    inp.mi.dwFlags = MOUSEEVENTF_MOVE;
    inp.mi.time = 0;
    inp.mi.dwExtraInfo = (DWORD) 0;

    SendInput(1, &inp, sizeof(inp));
}

/*
 * Local Variables:
 * mode: c
 * c-basic-offset: 4
 * fill-column: 78
 * End:
 */