Source

emacs / src / w32menu.c

Full commit
   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
/* Menu support for GNU Emacs on the Microsoft W32 API.
   Copyright (C) 1986, 1988, 1993-1994, 1996, 1998-1999, 2001-2011
                 Free Software Foundation, Inc.

This file is part of GNU Emacs.

GNU Emacs is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */

#include <config.h>

#include <signal.h>
#include <stdio.h>
#include <mbstring.h>
#include <setjmp.h>

#include "lisp.h"
#include "keyboard.h"
#include "keymap.h"
#include "frame.h"
#include "termhooks.h"
#include "window.h"
#include "blockinput.h"
#include "buffer.h"
#include "charset.h"
#include "coding.h"
#include "menu.h"

/* This may include sys/types.h, and that somehow loses
   if this is not done before the other system files.  */
#include "w32term.h"

/* Load sys/types.h if not already loaded.
   In some systems loading it twice is suicidal.  */
#ifndef makedev
#include <sys/types.h>
#endif

#include "dispextern.h"

#undef HAVE_DIALOGS /* TODO: Implement native dialogs.  */

#ifndef TRUE
#define TRUE 1
#define FALSE 0
#endif /* no TRUE */

HMENU current_popup_menu;

void syms_of_w32menu (void);
void globals_of_w32menu (void);

typedef BOOL (WINAPI * GetMenuItemInfoA_Proc) (
    IN HMENU,
    IN UINT,
    IN BOOL,
    IN OUT LPMENUITEMINFOA);
typedef BOOL (WINAPI * SetMenuItemInfoA_Proc) (
    IN HMENU,
    IN UINT,
    IN BOOL,
    IN LPCMENUITEMINFOA);
typedef int (WINAPI * MessageBoxW_Proc) (
    IN HWND window,
    IN WCHAR *text,
    IN WCHAR *caption,
    IN UINT type);

GetMenuItemInfoA_Proc get_menu_item_info = NULL;
SetMenuItemInfoA_Proc set_menu_item_info = NULL;
AppendMenuW_Proc unicode_append_menu = NULL;
MessageBoxW_Proc unicode_message_box = NULL;

Lisp_Object Qdebug_on_next_call;

void set_frame_menubar (FRAME_PTR, int, int);

#ifdef HAVE_DIALOGS
static Lisp_Object w32_dialog_show (FRAME_PTR, int, Lisp_Object, char**);
#else
static int is_simple_dialog (Lisp_Object);
static Lisp_Object simple_dialog_show (FRAME_PTR, Lisp_Object, Lisp_Object);
#endif

static void utf8to16 (unsigned char *, int, WCHAR *);
static int fill_in_menu (HMENU, widget_value *);

void w32_free_menu_strings (HWND);


/* This is set nonzero after the user activates the menu bar, and set
   to zero again after the menu bars are redisplayed by prepare_menu_bar.
   While it is nonzero, all calls to set_frame_menubar go deep.

   I don't understand why this is needed, but it does seem to be
   needed on Motif, according to Marcus Daniels <marcus@sysc.pdx.edu>.  */

int pending_menu_activation;

#ifdef HAVE_MENUS

DEFUN ("x-popup-dialog", Fx_popup_dialog, Sx_popup_dialog, 2, 3, 0,
       doc: /* Pop up a dialog box and return user's selection.
POSITION specifies which frame to use.
This is normally a mouse button event or a window or frame.
If POSITION is t, it means to use the frame the mouse is on.
The dialog box appears in the middle of the specified frame.

CONTENTS specifies the alternatives to display in the dialog box.
It is a list of the form (TITLE ITEM1 ITEM2...).
Each ITEM is a cons cell (STRING . VALUE).
The return value is VALUE from the chosen item.

An ITEM may also be just a string--that makes a nonselectable item.
An ITEM may also be nil--that means to put all preceding items
on the left of the dialog box and all following items on the right.
\(By default, approximately half appear on each side.)

If HEADER is non-nil, the frame title for the box is "Information",
otherwise it is "Question". */)
  (Lisp_Object position, Lisp_Object contents, Lisp_Object header)
{
  FRAME_PTR f = NULL;
  Lisp_Object window;

  check_w32 ();

  /* Decode the first argument: find the window or frame to use.  */
  if (EQ (position, Qt)
      || (CONSP (position) && (EQ (XCAR (position), Qmenu_bar)
                               || EQ (XCAR (position), Qtool_bar))))
    {
#if 0 /* Using the frame the mouse is on may not be right.  */
      /* Use the mouse's current position.  */
      FRAME_PTR new_f = SELECTED_FRAME ();
      Lisp_Object bar_window;
      enum scroll_bar_part part;
      Time time;
      Lisp_Object x, y;

      (*mouse_position_hook) (&new_f, 1, &bar_window, &part, &x, &y, &time);

      if (new_f != 0)
	XSETFRAME (window, new_f);
      else
	window = selected_window;
#endif
      window = selected_window;
    }
  else if (CONSP (position))
    {
      Lisp_Object tem;
      tem = Fcar (position);
      if (CONSP (tem))
	window = Fcar (Fcdr (position));
      else
	{
	  tem = Fcar (Fcdr (position));  /* EVENT_START (position) */
	  window = Fcar (tem);	     /* POSN_WINDOW (tem) */
	}
    }
  else if (WINDOWP (position) || FRAMEP (position))
    window = position;
  else
    window = Qnil;

  /* Decode where to put the menu.  */

  if (FRAMEP (window))
    f = XFRAME (window);
  else if (WINDOWP (window))
    {
      CHECK_LIVE_WINDOW (window);
      f = XFRAME (WINDOW_FRAME (XWINDOW (window)));
    }
  else
    /* ??? Not really clean; should be CHECK_WINDOW_OR_FRAME,
       but I don't want to make one now.  */
    CHECK_WINDOW (window);

#ifndef HAVE_DIALOGS

  {
    /* Handle simple Yes/No choices as MessageBox popups.  */
    if (is_simple_dialog (contents))
      return simple_dialog_show (f, contents, header);
    else
      {
	/* Display a menu with these alternatives
	   in the middle of frame F.  */
	Lisp_Object x, y, frame, newpos;
	XSETFRAME (frame, f);
	XSETINT (x, x_pixel_width (f) / 2);
	XSETINT (y, x_pixel_height (f) / 2);
	newpos = Fcons (Fcons (x, Fcons (y, Qnil)), Fcons (frame, Qnil));
	return Fx_popup_menu (newpos,
			      Fcons (Fcar (contents), Fcons (contents, Qnil)));
      }
  }
#else /* HAVE_DIALOGS */
  {
    Lisp_Object title;
    char *error_name;
    Lisp_Object selection;

    /* Decode the dialog items from what was specified.  */
    title = Fcar (contents);
    CHECK_STRING (title);

    list_of_panes (Fcons (contents, Qnil));

    /* Display them in a dialog box.  */
    BLOCK_INPUT;
    selection = w32_dialog_show (f, 0, title, header, &error_name);
    UNBLOCK_INPUT;

    discard_menu_items ();
    FRAME_X_DISPLAY_INFO (f)->grabbed = 0;

    if (error_name) error (error_name);
    return selection;
  }
#endif /* HAVE_DIALOGS */
}

/* Activate the menu bar of frame F.
   This is called from keyboard.c when it gets the
   MENU_BAR_ACTIVATE_EVENT out of the Emacs event queue.

   To activate the menu bar, we signal to the input thread that it can
   return from the WM_INITMENU message, allowing the normal Windows
   processing of the menus.

   But first we recompute the menu bar contents (the whole tree).

   This way we can safely execute Lisp code.  */

void
x_activate_menubar (FRAME_PTR f)
{
  set_frame_menubar (f, 0, 1);

  /* Lock out further menubar changes while active.  */
  f->output_data.w32->menubar_active = 1;

  /* Signal input thread to return from WM_INITMENU.  */
  complete_deferred_msg (FRAME_W32_WINDOW (f), WM_INITMENU, 0);
}

/* This callback is called from the menu bar pulldown menu
   when the user makes a selection.
   Figure out what the user chose
   and put the appropriate events into the keyboard buffer.  */

void
menubar_selection_callback (FRAME_PTR f, void * client_data)
{
  Lisp_Object prefix, entry;
  Lisp_Object vector;
  Lisp_Object *subprefix_stack;
  int submenu_depth = 0;
  int i;

  if (!f)
    return;
  entry = Qnil;
  subprefix_stack = (Lisp_Object *) alloca (f->menu_bar_items_used * sizeof (Lisp_Object));
  vector = f->menu_bar_vector;
  prefix = Qnil;
  i = 0;
  while (i < f->menu_bar_items_used)
    {
      if (EQ (AREF (vector, i), Qnil))
	{
	  subprefix_stack[submenu_depth++] = prefix;
	  prefix = entry;
	  i++;
	}
      else if (EQ (AREF (vector, i), Qlambda))
	{
	  prefix = subprefix_stack[--submenu_depth];
	  i++;
	}
      else if (EQ (AREF (vector, i), Qt))
	{
	  prefix = AREF (vector, i + MENU_ITEMS_PANE_PREFIX);
	  i += MENU_ITEMS_PANE_LENGTH;
	}
      else
	{
	  entry = AREF (vector, i + MENU_ITEMS_ITEM_VALUE);
	  /* The EMACS_INT cast avoids a warning.  There's no problem
	     as long as pointers have enough bits to hold small integers.  */
	  if ((int) (EMACS_INT) client_data == i)
	    {
	      int j;
	      struct input_event buf;
	      Lisp_Object frame;
	      EVENT_INIT (buf);

	      XSETFRAME (frame, f);
	      buf.kind = MENU_BAR_EVENT;
	      buf.frame_or_window = frame;
	      buf.arg = frame;
	      kbd_buffer_store_event (&buf);

	      for (j = 0; j < submenu_depth; j++)
		if (!NILP (subprefix_stack[j]))
		  {
		    buf.kind = MENU_BAR_EVENT;
		    buf.frame_or_window = frame;
		    buf.arg = subprefix_stack[j];
		    kbd_buffer_store_event (&buf);
		  }

	      if (!NILP (prefix))
		{
		  buf.kind = MENU_BAR_EVENT;
		  buf.frame_or_window = frame;
		  buf.arg = prefix;
		  kbd_buffer_store_event (&buf);
		}

	      buf.kind = MENU_BAR_EVENT;
	      buf.frame_or_window = frame;
	      buf.arg = entry;
	      /* Free memory used by owner-drawn and help-echo strings.  */
	      w32_free_menu_strings (FRAME_W32_WINDOW (f));
	      kbd_buffer_store_event (&buf);

	      f->output_data.w32->menubar_active = 0;
	      return;
	    }
	  i += MENU_ITEMS_ITEM_LENGTH;
	}
    }
  /* Free memory used by owner-drawn and help-echo strings.  */
  w32_free_menu_strings (FRAME_W32_WINDOW (f));
  f->output_data.w32->menubar_active = 0;
}


/* Set the contents of the menubar widgets of frame F.
   The argument FIRST_TIME is currently ignored;
   it is set the first time this is called, from initialize_frame_menubar.  */

void
set_frame_menubar (FRAME_PTR f, int first_time, int deep_p)
{
  HMENU menubar_widget = f->output_data.w32->menubar_widget;
  Lisp_Object items;
  widget_value *wv, *first_wv, *prev_wv = 0;
  int i, last_i;
  int *submenu_start, *submenu_end;
  int *submenu_top_level_items, *submenu_n_panes;

  /* We must not change the menubar when actually in use.  */
  if (f->output_data.w32->menubar_active)
    return;

  XSETFRAME (Vmenu_updating_frame, f);

  if (! menubar_widget)
    deep_p = 1;
  else if (pending_menu_activation && !deep_p)
    deep_p = 1;

  if (deep_p)
    {
      /* Make a widget-value tree representing the entire menu trees.  */

      struct buffer *prev = current_buffer;
      Lisp_Object buffer;
      int specpdl_count = SPECPDL_INDEX ();
      int previous_menu_items_used = f->menu_bar_items_used;
      Lisp_Object *previous_items
	= (Lisp_Object *) alloca (previous_menu_items_used
				  * sizeof (Lisp_Object));

      /* If we are making a new widget, its contents are empty,
	 do always reinitialize them.  */
      if (! menubar_widget)
	previous_menu_items_used = 0;

      buffer = XWINDOW (FRAME_SELECTED_WINDOW (f))->buffer;
      specbind (Qinhibit_quit, Qt);
      /* Don't let the debugger step into this code
	 because it is not reentrant.  */
      specbind (Qdebug_on_next_call, Qnil);

      record_unwind_save_match_data ();

      if (NILP (Voverriding_local_map_menu_flag))
	{
	  specbind (Qoverriding_terminal_local_map, Qnil);
	  specbind (Qoverriding_local_map, Qnil);
	}

      set_buffer_internal_1 (XBUFFER (buffer));

      /* Run the hooks.  */
      safe_run_hooks (Qactivate_menubar_hook);
      safe_run_hooks (Qmenu_bar_update_hook);
      FRAME_MENU_BAR_ITEMS (f) = menu_bar_items (FRAME_MENU_BAR_ITEMS (f));

      items = FRAME_MENU_BAR_ITEMS (f);

      /* Save the frame's previous menu bar contents data.  */
      if (previous_menu_items_used)
	memcpy (previous_items, XVECTOR (f->menu_bar_vector)->contents,
		previous_menu_items_used * sizeof (Lisp_Object));

      /* Fill in menu_items with the current menu bar contents.
	 This can evaluate Lisp code.  */
      save_menu_items ();

      menu_items = f->menu_bar_vector;
      menu_items_allocated = VECTORP (menu_items) ? ASIZE (menu_items) : 0;
      submenu_start = (int *) alloca (ASIZE (items) * sizeof (int));
      submenu_end = (int *) alloca (ASIZE (items) * sizeof (int));
      submenu_n_panes = (int *) alloca (ASIZE (items) * sizeof (int));
      submenu_top_level_items = (int *) alloca (ASIZE (items) * sizeof (int));
      init_menu_items ();
      for (i = 0; i < ASIZE (items); i += 4)
	{
	  Lisp_Object key, string, maps;

	  last_i = i;

	  key = AREF (items, i);
	  string = AREF (items, i + 1);
	  maps = AREF (items, i + 2);
	  if (NILP (string))
	    break;

	  submenu_start[i] = menu_items_used;

	  menu_items_n_panes = 0;
	  submenu_top_level_items[i]
	    = parse_single_submenu (key, string, maps);
	  submenu_n_panes[i] = menu_items_n_panes;

	  submenu_end[i] = menu_items_used;
	}

      finish_menu_items ();

      /* Convert menu_items into widget_value trees
	 to display the menu.  This cannot evaluate Lisp code.  */

      wv = xmalloc_widget_value ();
      wv->name = "menubar";
      wv->value = 0;
      wv->enabled = 1;
      wv->button_type = BUTTON_TYPE_NONE;
      wv->help = Qnil;
      first_wv = wv;

      for (i = 0; i < last_i; i += 4)
	{
	  menu_items_n_panes = submenu_n_panes[i];
	  wv = digest_single_submenu (submenu_start[i], submenu_end[i],
				      submenu_top_level_items[i]);
	  if (prev_wv)
	    prev_wv->next = wv;
	  else
	    first_wv->contents = wv;
	  /* Don't set wv->name here; GC during the loop might relocate it.  */
	  wv->enabled = 1;
	  wv->button_type = BUTTON_TYPE_NONE;
	  prev_wv = wv;
	}

      set_buffer_internal_1 (prev);

      /* If there has been no change in the Lisp-level contents
	 of the menu bar, skip redisplaying it.  Just exit.  */

      for (i = 0; i < previous_menu_items_used; i++)
	if (menu_items_used == i
	    || (!EQ (previous_items[i], AREF (menu_items, i))))
	  break;
      if (i == menu_items_used && i == previous_menu_items_used && i != 0)
	{
	  free_menubar_widget_value_tree (first_wv);
	  discard_menu_items ();
          unbind_to (specpdl_count, Qnil);
	  return;
	}

      f->menu_bar_vector = menu_items;
      f->menu_bar_items_used = menu_items_used;

      /* This undoes save_menu_items.  */
      unbind_to (specpdl_count, Qnil);

      /* Now GC cannot happen during the lifetime of the widget_value,
	 so it's safe to store data from a Lisp_String, as long as
	 local copies are made when the actual menu is created.
	 Windows takes care of this for normal string items, but
	 not for owner-drawn items or additional item-info.  */
      wv = first_wv->contents;
      for (i = 0; i < ASIZE (items); i += 4)
	{
	  Lisp_Object string;
	  string = AREF (items, i + 1);
	  if (NILP (string))
	    break;
	  wv->name = SSDATA (string);
	  update_submenu_strings (wv->contents);
	  wv = wv->next;
	}
    }
  else
    {
      /* Make a widget-value tree containing
	 just the top level menu bar strings.  */

      wv = xmalloc_widget_value ();
      wv->name = "menubar";
      wv->value = 0;
      wv->enabled = 1;
      wv->button_type = BUTTON_TYPE_NONE;
      wv->help = Qnil;
      first_wv = wv;

      items = FRAME_MENU_BAR_ITEMS (f);
      for (i = 0; i < ASIZE (items); i += 4)
	{
	  Lisp_Object string;

	  string = AREF (items, i + 1);
	  if (NILP (string))
	    break;

	  wv = xmalloc_widget_value ();
	  wv->name = SSDATA (string);
	  wv->value = 0;
	  wv->enabled = 1;
	  wv->button_type = BUTTON_TYPE_NONE;
	  wv->help = Qnil;
	  /* This prevents lwlib from assuming this
	     menu item is really supposed to be empty.  */
	  /* The EMACS_INT cast avoids a warning.
	     This value just has to be different from small integers.  */
	  wv->call_data = (void *) (EMACS_INT) (-1);

	  if (prev_wv)
	    prev_wv->next = wv;
	  else
	    first_wv->contents = wv;
	  prev_wv = wv;
	}

      /* Forget what we thought we knew about what is in the
	 detailed contents of the menu bar menus.
	 Changing the top level always destroys the contents.  */
      f->menu_bar_items_used = 0;
    }

  /* Create or update the menu bar widget.  */

  BLOCK_INPUT;

  if (menubar_widget)
    {
      /* Empty current menubar, rather than creating a fresh one.  */
      while (DeleteMenu (menubar_widget, 0, MF_BYPOSITION))
	;
    }
  else
    {
      menubar_widget = CreateMenu ();
    }
  fill_in_menu (menubar_widget, first_wv->contents);

  free_menubar_widget_value_tree (first_wv);

  {
    HMENU old_widget = f->output_data.w32->menubar_widget;

    f->output_data.w32->menubar_widget = menubar_widget;
    SetMenu (FRAME_W32_WINDOW (f), f->output_data.w32->menubar_widget);
    /* Causes flicker when menu bar is updated
    DrawMenuBar (FRAME_W32_WINDOW (f)); */

    /* Force the window size to be recomputed so that the frame's text
       area remains the same, if menubar has just been created.  */
    if (old_widget == NULL)
      x_set_window_size (f, 0, FRAME_COLS (f), FRAME_LINES (f));
  }

  UNBLOCK_INPUT;
}

/* Called from Fx_create_frame to create the initial menubar of a frame
   before it is mapped, so that the window is mapped with the menubar already
   there instead of us tacking it on later and thrashing the window after it
   is visible.  */

void
initialize_frame_menubar (FRAME_PTR f)
{
  /* This function is called before the first chance to redisplay
     the frame.  It has to be, so the frame will have the right size.  */
  FRAME_MENU_BAR_ITEMS (f) = menu_bar_items (FRAME_MENU_BAR_ITEMS (f));
  set_frame_menubar (f, 1, 1);
}

/* Get rid of the menu bar of frame F, and free its storage.
   This is used when deleting a frame, and when turning off the menu bar.  */

void
free_frame_menubar (FRAME_PTR f)
{
  BLOCK_INPUT;

  {
    HMENU old = GetMenu (FRAME_W32_WINDOW (f));
    SetMenu (FRAME_W32_WINDOW (f), NULL);
    f->output_data.w32->menubar_widget = NULL;
    DestroyMenu (old);
  }

  UNBLOCK_INPUT;
}


/* w32_menu_show actually displays a menu using the panes and items in
   menu_items and returns the value selected from it; we assume input
   is blocked by the caller.  */

/* F is the frame the menu is for.
   X and Y are the frame-relative specified position,
   relative to the inside upper left corner of the frame F.
   FOR_CLICK is nonzero if this menu was invoked for a mouse click.
   KEYMAPS is 1 if this menu was specified with keymaps;
    in that case, we return a list containing the chosen item's value
    and perhaps also the pane's prefix.
   TITLE is the specified menu title.
   ERROR is a place to store an error message string in case of failure.
   (We return nil on failure, but the value doesn't actually matter.)  */

Lisp_Object
w32_menu_show (FRAME_PTR f, int x, int y, int for_click, int keymaps,
	       Lisp_Object title, const char **error)
{
  int i;
  int menu_item_selection;
  HMENU menu;
  POINT pos;
  widget_value *wv, *save_wv = 0, *first_wv = 0, *prev_wv = 0;
  widget_value **submenu_stack
    = (widget_value **) alloca (menu_items_used * sizeof (widget_value *));
  Lisp_Object *subprefix_stack
    = (Lisp_Object *) alloca (menu_items_used * sizeof (Lisp_Object));
  int submenu_depth = 0;
  int first_pane;

  *error = NULL;

  if (menu_items_n_panes == 0)
    return Qnil;

  if (menu_items_used <= MENU_ITEMS_PANE_LENGTH)
    {
      *error = "Empty menu";
      return Qnil;
    }

  /* Create a tree of widget_value objects
     representing the panes and their items.  */
  wv = xmalloc_widget_value ();
  wv->name = "menu";
  wv->value = 0;
  wv->enabled = 1;
  wv->button_type = BUTTON_TYPE_NONE;
  wv->help = Qnil;
  first_wv = wv;
  first_pane = 1;

  /* Loop over all panes and items, filling in the tree.  */
  i = 0;
  while (i < menu_items_used)
    {
      if (EQ (AREF (menu_items, i), Qnil))
	{
	  submenu_stack[submenu_depth++] = save_wv;
	  save_wv = prev_wv;
	  prev_wv = 0;
	  first_pane = 1;
	  i++;
	}
      else if (EQ (AREF (menu_items, i), Qlambda))
	{
	  prev_wv = save_wv;
	  save_wv = submenu_stack[--submenu_depth];
	  first_pane = 0;
	  i++;
	}
      else if (EQ (AREF (menu_items, i), Qt)
	       && submenu_depth != 0)
	i += MENU_ITEMS_PANE_LENGTH;
      /* Ignore a nil in the item list.
	 It's meaningful only for dialog boxes.  */
      else if (EQ (AREF (menu_items, i), Qquote))
	i += 1;
      else if (EQ (AREF (menu_items, i), Qt))
	{
	  /* Create a new pane.  */
	  Lisp_Object pane_name, prefix;
	  char *pane_string;
	  pane_name = AREF (menu_items, i + MENU_ITEMS_PANE_NAME);
	  prefix = AREF (menu_items, i + MENU_ITEMS_PANE_PREFIX);

	  if (STRINGP (pane_name))
	    {
	      if (unicode_append_menu)
		pane_name = ENCODE_UTF_8 (pane_name);
	      else if (STRING_MULTIBYTE (pane_name))
		pane_name = ENCODE_SYSTEM (pane_name);

	      ASET (menu_items, i + MENU_ITEMS_PANE_NAME, pane_name);
	    }

	  pane_string = (NILP (pane_name)
			 ? "" : SSDATA (pane_name));
	  /* If there is just one top-level pane, put all its items directly
	     under the top-level menu.  */
	  if (menu_items_n_panes == 1)
	    pane_string = "";

	  /* If the pane has a meaningful name,
	     make the pane a top-level menu item
	     with its items as a submenu beneath it.  */
	  if (!keymaps && strcmp (pane_string, ""))
	    {
	      wv = xmalloc_widget_value ();
	      if (save_wv)
		save_wv->next = wv;
	      else
		first_wv->contents = wv;
	      wv->name = pane_string;
	      if (keymaps && !NILP (prefix))
		wv->name++;
	      wv->value = 0;
	      wv->enabled = 1;
	      wv->button_type = BUTTON_TYPE_NONE;
	      wv->help = Qnil;
	      save_wv = wv;
	      prev_wv = 0;
	    }
	  else if (first_pane)
	    {
	      save_wv = wv;
	      prev_wv = 0;
	    }
	  first_pane = 0;
	  i += MENU_ITEMS_PANE_LENGTH;
	}
      else
	{
	  /* Create a new item within current pane.  */
	  Lisp_Object item_name, enable, descrip, def, type, selected, help;

	  item_name = AREF (menu_items, i + MENU_ITEMS_ITEM_NAME);
	  enable = AREF (menu_items, i + MENU_ITEMS_ITEM_ENABLE);
	  descrip = AREF (menu_items, i + MENU_ITEMS_ITEM_EQUIV_KEY);
	  def = AREF (menu_items, i + MENU_ITEMS_ITEM_DEFINITION);
	  type = AREF (menu_items, i + MENU_ITEMS_ITEM_TYPE);
	  selected = AREF (menu_items, i + MENU_ITEMS_ITEM_SELECTED);
          help = AREF (menu_items, i + MENU_ITEMS_ITEM_HELP);

          if (STRINGP (item_name))
	    {
	      if (unicode_append_menu)
		item_name = ENCODE_UTF_8 (item_name);
	      else if (STRING_MULTIBYTE (item_name))
		item_name = ENCODE_SYSTEM (item_name);

	      ASET (menu_items, i + MENU_ITEMS_ITEM_NAME, item_name);
	    }

	  if (STRINGP (descrip) && STRING_MULTIBYTE (descrip))
            {
	      descrip = ENCODE_SYSTEM (descrip);
	      ASET (menu_items, i + MENU_ITEMS_ITEM_EQUIV_KEY, descrip);
	    }

	  wv = xmalloc_widget_value ();
	  if (prev_wv)
	    prev_wv->next = wv;
	  else
	    save_wv->contents = wv;
	  wv->name = SSDATA (item_name);
	  if (!NILP (descrip))
	    wv->key = SSDATA (descrip);
	  wv->value = 0;
	  /* Use the contents index as call_data, since we are
             restricted to 16-bits.  */
	  wv->call_data = !NILP (def) ? (void *) (EMACS_INT) i : 0;
	  wv->enabled = !NILP (enable);

	  if (NILP (type))
	    wv->button_type = BUTTON_TYPE_NONE;
	  else if (EQ (type, QCtoggle))
	    wv->button_type = BUTTON_TYPE_TOGGLE;
	  else if (EQ (type, QCradio))
	    wv->button_type = BUTTON_TYPE_RADIO;
	  else
	    abort ();

	  wv->selected = !NILP (selected);

          if (!STRINGP (help))
	    help = Qnil;

	  wv->help = help;

	  prev_wv = wv;

	  i += MENU_ITEMS_ITEM_LENGTH;
	}
    }

  /* Deal with the title, if it is non-nil.  */
  if (!NILP (title))
    {
      widget_value *wv_title = xmalloc_widget_value ();
      widget_value *wv_sep = xmalloc_widget_value ();

      /* Maybe replace this separator with a bitmap or owner-draw item
	 so that it looks better.  Having two separators looks odd.  */
      wv_sep->name = "--";
      wv_sep->next = first_wv->contents;
      wv_sep->help = Qnil;

      if (unicode_append_menu)
	title = ENCODE_UTF_8 (title);
      else if (STRING_MULTIBYTE (title))
	title = ENCODE_SYSTEM (title);

      wv_title->name = SSDATA (title);
      wv_title->enabled = TRUE;
      wv_title->title = TRUE;
      wv_title->button_type = BUTTON_TYPE_NONE;
      wv_title->help = Qnil;
      wv_title->next = wv_sep;
      first_wv->contents = wv_title;
    }

  /* No selection has been chosen yet.  */
  menu_item_selection = 0;

  /* Actually create the menu.  */
  current_popup_menu = menu = CreatePopupMenu ();
  fill_in_menu (menu, first_wv->contents);

  /* Adjust coordinates to be root-window-relative.  */
  pos.x = x;
  pos.y = y;
  ClientToScreen (FRAME_W32_WINDOW (f), &pos);

  /* Display the menu.  */
  menu_item_selection = SendMessage (FRAME_W32_WINDOW (f),
				     WM_EMACS_TRACKPOPUPMENU,
				     (WPARAM)menu, (LPARAM)&pos);

  /* Clean up extraneous mouse events which might have been generated
     during the call. */
  discard_mouse_events ();
  FRAME_X_DISPLAY_INFO (f)->grabbed = 0;

  /* Free the widget_value objects we used to specify the contents.  */
  free_menubar_widget_value_tree (first_wv);

  DestroyMenu (menu);

  /* Free the owner-drawn and help-echo menu strings.  */
  w32_free_menu_strings (FRAME_W32_WINDOW (f));
  f->output_data.w32->menubar_active = 0;

  /* Find the selected item, and its pane, to return
     the proper value.  */
  if (menu_item_selection != 0)
    {
      Lisp_Object prefix, entry;

      prefix = entry = Qnil;
      i = 0;
      while (i < menu_items_used)
	{
	  if (EQ (AREF (menu_items, i), Qnil))
	    {
	      subprefix_stack[submenu_depth++] = prefix;
	      prefix = entry;
	      i++;
	    }
	  else if (EQ (AREF (menu_items, i), Qlambda))
	    {
	      prefix = subprefix_stack[--submenu_depth];
	      i++;
	    }
	  else if (EQ (AREF (menu_items, i), Qt))
	    {
	      prefix = AREF (menu_items, i + MENU_ITEMS_PANE_PREFIX);
	      i += MENU_ITEMS_PANE_LENGTH;
	    }
	  /* Ignore a nil in the item list.
	     It's meaningful only for dialog boxes.  */
	  else if (EQ (AREF (menu_items, i), Qquote))
	    i += 1;
	  else
	    {
	      entry	= AREF (menu_items, i + MENU_ITEMS_ITEM_VALUE);
	      if (menu_item_selection == i)
		{
		  if (keymaps != 0)
		    {
		      int j;

		      entry = Fcons (entry, Qnil);
		      if (!NILP (prefix))
			entry = Fcons (prefix, entry);
		      for (j = submenu_depth - 1; j >= 0; j--)
			if (!NILP (subprefix_stack[j]))
			  entry = Fcons (subprefix_stack[j], entry);
		    }
		  return entry;
		}
	      i += MENU_ITEMS_ITEM_LENGTH;
	    }
	}
    }
  else if (!for_click)
    /* Make "Cancel" equivalent to C-g.  */
    Fsignal (Qquit, Qnil);

  return Qnil;
}


#ifdef HAVE_DIALOGS
/* TODO: On Windows, there are two ways of defining a dialog.

   1. Create a predefined dialog resource and include it in nt/emacs.rc.
      Using this method, we could then set the titles and make unneeded
      buttons invisible before displaying the dialog.  Everything would
      be a fixed size though, so there is a risk that text does not
      fit on a button.
   2. Create the dialog template in memory on the fly.  This allows us
      to size the dialog and buttons dynamically, probably giving more
      natural looking results for dialogs with few buttons, and eliminating
      the problem of text overflowing the buttons.  But the API for this is
      quite complex - structures have to be allocated in particular ways,
      text content is tacked onto the end of structures in variable length
      arrays with further structures tacked on after these, there are
      certain alignment requirements for all this, and we have to
      measure all the text and convert to "dialog coordinates" to figure
      out how big to make everything.

      For now, we'll just stick with menus for dialogs that are more
      complicated than simple yes/no type questions for which we can use
      the MessageBox function.
*/

static char * button_names [] = {
  "button1", "button2", "button3", "button4", "button5",
  "button6", "button7", "button8", "button9", "button10" };

static Lisp_Object
w32_dialog_show (FRAME_PTR f, int keymaps,
		 Lisp_Object title, Lisp_Object header,
		 char **error)
{
  int i, nb_buttons = 0;
  char dialog_name[6];
  int menu_item_selection;

  widget_value *wv, *first_wv = 0, *prev_wv = 0;

  /* Number of elements seen so far, before boundary.  */
  int left_count = 0;
  /* 1 means we've seen the boundary between left-hand elts and right-hand.  */
  int boundary_seen = 0;

  *error = NULL;

  if (menu_items_n_panes > 1)
    {
      *error = "Multiple panes in dialog box";
      return Qnil;
    }

  /* Create a tree of widget_value objects
     representing the text label and buttons.  */
  {
    Lisp_Object pane_name, prefix;
    char *pane_string;
    pane_name = AREF (menu_items, MENU_ITEMS_PANE_NAME);
    prefix = AREF (menu_items, MENU_ITEMS_PANE_PREFIX);
    pane_string = (NILP (pane_name)
		   ? "" : SSDATA (pane_name));
    prev_wv = xmalloc_widget_value ();
    prev_wv->value = pane_string;
    if (keymaps && !NILP (prefix))
      prev_wv->name++;
    prev_wv->enabled = 1;
    prev_wv->name = "message";
    prev_wv->help = Qnil;
    first_wv = prev_wv;

    /* Loop over all panes and items, filling in the tree.  */
    i = MENU_ITEMS_PANE_LENGTH;
    while (i < menu_items_used)
      {

	/* Create a new item within current pane.  */
	Lisp_Object item_name, enable, descrip, help;

	item_name = AREF (menu_items, i + MENU_ITEMS_ITEM_NAME);
	enable = AREF (menu_items, i + MENU_ITEMS_ITEM_ENABLE);
	descrip = AREF (menu_items, i + MENU_ITEMS_ITEM_EQUIV_KEY);
        help = AREF (menu_items, i + MENU_ITEMS_ITEM_HELP);

	if (NILP (item_name))
	  {
	    free_menubar_widget_value_tree (first_wv);
	    *error = "Submenu in dialog items";
	    return Qnil;
	  }
	if (EQ (item_name, Qquote))
	  {
	    /* This is the boundary between left-side elts
	       and right-side elts.  Stop incrementing right_count.  */
	    boundary_seen = 1;
	    i++;
	    continue;
	  }
	if (nb_buttons >= 9)
	  {
	    free_menubar_widget_value_tree (first_wv);
	    *error = "Too many dialog items";
	    return Qnil;
	  }

	wv = xmalloc_widget_value ();
	prev_wv->next = wv;
	wv->name = (char *) button_names[nb_buttons];
	if (!NILP (descrip))
	  wv->key = SSDATA (descrip);
	wv->value = SSDATA (item_name);
	wv->call_data = (void *) &AREF (menu_items, i);
	wv->enabled = !NILP (enable);
	wv->help = Qnil;
	prev_wv = wv;

	if (! boundary_seen)
	  left_count++;

	nb_buttons++;
	i += MENU_ITEMS_ITEM_LENGTH;
      }

    /* If the boundary was not specified,
       by default put half on the left and half on the right.  */
    if (! boundary_seen)
      left_count = nb_buttons - nb_buttons / 2;

    wv = xmalloc_widget_value ();
    wv->name = dialog_name;
    wv->help = Qnil;

    /*  Frame title: 'Q' = Question, 'I' = Information.
        Can also have 'E' = Error if, one day, we want
        a popup for errors. */
    if (NILP (header))
      dialog_name[0] = 'Q';
    else
      dialog_name[0] = 'I';

    /* Dialog boxes use a really stupid name encoding
       which specifies how many buttons to use
       and how many buttons are on the right. */
    dialog_name[1] = '0' + nb_buttons;
    dialog_name[2] = 'B';
    dialog_name[3] = 'R';
    /* Number of buttons to put on the right.  */
    dialog_name[4] = '0' + nb_buttons - left_count;
    dialog_name[5] = 0;
    wv->contents = first_wv;
    first_wv = wv;
  }

  /* Actually create the dialog.  */
  dialog_id = widget_id_tick++;
  menu = lw_create_widget (first_wv->name, "dialog", dialog_id, first_wv,
			   f->output_data.w32->widget, 1, 0,
			   dialog_selection_callback, 0);
  lw_modify_all_widgets (dialog_id, first_wv->contents, TRUE);

  /* Free the widget_value objects we used to specify the contents.  */
  free_menubar_widget_value_tree (first_wv);

  /* No selection has been chosen yet.  */
  menu_item_selection = 0;

  /* Display the menu.  */
  lw_pop_up_all_widgets (dialog_id);

  /* Process events that apply to the menu.  */
  popup_get_selection ((XEvent *) 0, FRAME_X_DISPLAY_INFO (f), dialog_id);

  lw_destroy_all_widgets (dialog_id);

  /* Find the selected item, and its pane, to return
     the proper value.  */
  if (menu_item_selection != 0)
    {
      Lisp_Object prefix;

      prefix = Qnil;
      i = 0;
      while (i < menu_items_used)
	{
	  Lisp_Object entry;

	  if (EQ (AREF (menu_items, i), Qt))
	    {
	      prefix = AREF (menu_items, i + MENU_ITEMS_PANE_PREFIX);
	      i += MENU_ITEMS_PANE_LENGTH;
	    }
	  else
	    {
	      entry	= AREF (menu_items, i + MENU_ITEMS_ITEM_VALUE);
	      if (menu_item_selection == i)
		{
		  if (keymaps != 0)
		    {
		      entry = Fcons (entry, Qnil);
		      if (!NILP (prefix))
			entry = Fcons (prefix, entry);
		    }
		  return entry;
		}
	      i += MENU_ITEMS_ITEM_LENGTH;
	    }
	}
    }
  else
    /* Make "Cancel" equivalent to C-g.  */
    Fsignal (Qquit, Qnil);

  return Qnil;
}
#else /* !HAVE_DIALOGS  */

/* Currently we only handle Yes No dialogs (y-or-n-p and yes-or-no-p) as
   simple dialogs.  We could handle a few more, but I'm not aware of
   anywhere in Emacs that uses the other specific dialog choices that
   MessageBox provides.  */

static int
is_simple_dialog (Lisp_Object contents)
{
  Lisp_Object options = XCDR (contents);
  Lisp_Object name, yes, no, other;

  yes = build_string ("Yes");
  no = build_string ("No");

  if (!CONSP (options))
    return 0;

  name = XCAR (XCAR (options));
  if (!CONSP (options))
    return 0;

  if (!NILP (Fstring_equal (name, yes)))
    other = no;
  else if (!NILP (Fstring_equal (name, no)))
    other = yes;
  else
    return 0;

  options = XCDR (options);
  if (!CONSP (options))
    return 0;

  name = XCAR (XCAR (options));
  if (NILP (Fstring_equal (name, other)))
    return 0;

  /* Check there are no more options.  */
  options = XCDR (options);
  return !(CONSP (options));
}

static Lisp_Object
simple_dialog_show (FRAME_PTR f, Lisp_Object contents, Lisp_Object header)
{
  int answer;
  UINT type;
  Lisp_Object lispy_answer = Qnil, temp = XCAR (contents);

  type = MB_YESNO;

  /* Since we only handle Yes/No dialogs, and we already checked
     is_simple_dialog, we don't need to worry about checking contents
     to see what type of dialog to use.  */

  /* Use Unicode if possible, so any language can be displayed.  */
  if (unicode_message_box)
    {
      WCHAR *text, *title;

      if (STRINGP (temp))
	{
	  char *utf8_text = SDATA (ENCODE_UTF_8 (temp));
	  /* Be pessimistic about the number of characters needed.
	     Remember characters outside the BMP will take more than
	     one utf16 word, so we cannot simply use the character
	     length of temp.  */
	  int utf8_len = strlen (utf8_text);
	  text = alloca ((utf8_len + 1) * sizeof (WCHAR));
	  utf8to16 (utf8_text, utf8_len, text);
	}
      else
	{
	  text = L"";
	}

      if (NILP (header))
	{
	  title = L"Question";
	  type |= MB_ICONQUESTION;
	}
      else
	{
	  title = L"Information";
	  type |= MB_ICONINFORMATION;
	}

      answer = unicode_message_box (FRAME_W32_WINDOW (f), text, title, type);
    }
  else
    {
      char *text, *title;

      /* Fall back on ANSI message box, but at least use system
	 encoding so questions representable by the system codepage
	 are encoded properly.  */
      if (STRINGP (temp))
	text = SDATA (ENCODE_SYSTEM (temp));
      else
	text = "";

      if (NILP (header))
	{
	  title = "Question";
	  type |= MB_ICONQUESTION;
	}
      else
	{
	  title = "Information";
	  type |= MB_ICONINFORMATION;
	}

      answer = MessageBox (FRAME_W32_WINDOW (f), text, title, type);
    }

  if (answer == IDYES)
    lispy_answer = build_string ("Yes");
  else if (answer == IDNO)
    lispy_answer = build_string ("No");
  else
    Fsignal (Qquit, Qnil);

  for (temp = XCDR (contents); CONSP (temp); temp = XCDR (temp))
    {
      Lisp_Object item, name, value;
      item = XCAR (temp);
      if (CONSP (item))
	{
	  name = XCAR (item);
	  value = XCDR (item);
	}
      else
	{
	  name = item;
	  value = Qnil;
	}

      if (!NILP (Fstring_equal (name, lispy_answer)))
	{
	  return value;
	}
    }
  Fsignal (Qquit, Qnil);
  return Qnil;
}
#endif  /* !HAVE_DIALOGS  */


/* UTF8: 0xxxxxxx, 110xxxxx 10xxxxxx, 1110xxxx, 10xxxxxx, 10xxxxxx */
static void
utf8to16 (unsigned char * src, int len, WCHAR * dest)
{
  while (len > 0)
    {
      if (*src < 0x80)
	{
	  *dest = (WCHAR) *src;
	  dest++; src++; len--;
	}
      /* Since we might get >3 byte sequences which we don't handle, ignore the extra parts.  */
      else if (*src < 0xC0)
	{
	  src++; len--;
	}
      /* 2 char UTF-8 sequence.  */
      else if (*src <  0xE0)
	{
	  *dest = (WCHAR) (((*src & 0x1f) << 6)
			   | (*(src + 1) & 0x3f));
	  src += 2; len -= 2; dest++;
	}
      else if (*src < 0xF0)
	{
	  *dest = (WCHAR) (((*src & 0x0f) << 12)
			   | ((*(src + 1) & 0x3f) << 6)
			   | (*(src + 2) & 0x3f));
	  src += 3; len -= 3; dest++;
	}
      else /* Not encodable. Insert Unicode Substitution char.  */
	{
	  *dest = (WCHAR) 0xfffd;
	  src++; len--; dest++;
	}
    }
  *dest = 0;
}

static int
add_menu_item (HMENU menu, widget_value *wv, HMENU item)
{
  UINT fuFlags;
  char *out_string, *p, *q;
  int return_value;
  size_t nlen, orig_len;

  if (menu_separator_name_p (wv->name))
    {
      fuFlags = MF_SEPARATOR;
      out_string = NULL;
    }
  else
    {
      if (wv->enabled)
	fuFlags = MF_STRING;
      else
	fuFlags = MF_STRING | MF_GRAYED;

      if (wv->key != NULL)
	{
	  out_string = alloca (strlen (wv->name) + strlen (wv->key) + 2);
	  strcpy (out_string, wv->name);
	  strcat (out_string, "\t");
	  strcat (out_string, wv->key);
	}
      else
	out_string = (char *)wv->name;

      /* Quote any special characters within the menu item's text and
	 key binding.  */
      nlen = orig_len = strlen (out_string);
      if (unicode_append_menu)
        {
          /* With UTF-8, & cannot be part of a multibyte character.  */
          for (p = out_string; *p; p++)
            {
              if (*p == '&')
                nlen++;
            }
        }
      else
        {
          /* If encoded with the system codepage, use multibyte string
             functions in case of multibyte characters that contain '&'.  */
          for (p = out_string; *p; p = _mbsinc (p))
            {
              if (_mbsnextc (p) == '&')
                nlen++;
            }
        }

      if (nlen > orig_len)
        {
          p = out_string;
          out_string = alloca (nlen + 1);
          q = out_string;
          while (*p)
            {
              if (unicode_append_menu)
                {
                  if (*p == '&')
                    *q++ = *p;
                  *q++ = *p++;
                }
              else
                {
                  if (_mbsnextc (p) == '&')
                    {
                      _mbsncpy (q, p, 1);
                      q = _mbsinc (q);
                    }
                  _mbsncpy (q, p, 1);
                  p = _mbsinc (p);
                  q = _mbsinc (q);
                }
            }
          *q = '\0';
        }

      if (item != NULL)
	fuFlags = MF_POPUP;
      else if (wv->title || wv->call_data == 0)
	{
	  /* Only use MF_OWNERDRAW if GetMenuItemInfo is usable, since
	     we can't deallocate the memory otherwise.  */
	  if (get_menu_item_info)
	    {
              out_string = (char *) local_alloc (strlen (wv->name) + 1);
              strcpy (out_string, wv->name);
#ifdef MENU_DEBUG
	      DebPrint ("Menu: allocating %ld for owner-draw", out_string);
#endif
	      fuFlags = MF_OWNERDRAW | MF_DISABLED;
	    }
	  else
	    fuFlags = MF_DISABLED;
	}

      /* Draw radio buttons and tickboxes. */
      else if (wv->selected && (wv->button_type == BUTTON_TYPE_TOGGLE ||
				wv->button_type == BUTTON_TYPE_RADIO))
	fuFlags |= MF_CHECKED;
      else
	fuFlags |= MF_UNCHECKED;
    }

  if (unicode_append_menu && out_string)
    {
      /* Convert out_string from UTF-8 to UTF-16-LE.  */
      int utf8_len = strlen (out_string);
      WCHAR * utf16_string;
      if (fuFlags & MF_OWNERDRAW)
	utf16_string = local_alloc ((utf8_len + 1) * sizeof (WCHAR));
      else
	utf16_string = alloca ((utf8_len + 1) * sizeof (WCHAR));

      utf8to16 (out_string, utf8_len, utf16_string);
      return_value = unicode_append_menu (menu, fuFlags,
					  item != NULL ? (UINT) item
					    : (UINT) wv->call_data,
					  utf16_string);
      if (!return_value)
	{
	  /* On W9x/ME, Unicode menus are not supported, though AppendMenuW
	     apparently does exist at least in some cases and appears to be
	     stubbed out to do nothing.  out_string is UTF-8, but since
	     our standard menus are in English and this is only going to
	     happen the first time a menu is used, the encoding is
	     of minor importance compared with menus not working at all.  */
	  return_value =
	    AppendMenu (menu, fuFlags,
			item != NULL ? (UINT) item: (UINT) wv->call_data,
			out_string);
	  /* Don't use Unicode menus in future.  */
	  unicode_append_menu = NULL;
	}

      if (unicode_append_menu && (fuFlags & MF_OWNERDRAW))
	local_free (out_string);
    }
  else
    {
      return_value =
	AppendMenu (menu,
		    fuFlags,
		    item != NULL ? (UINT) item : (UINT) wv->call_data,
		    out_string );
    }

  /* This must be done after the menu item is created.  */
  if (!wv->title && wv->call_data != 0)
    {
      if (set_menu_item_info)
	{
	  MENUITEMINFO info;
	  memset (&info, 0, sizeof (info));
	  info.cbSize = sizeof (info);
	  info.fMask = MIIM_DATA;

	  /* Set help string for menu item.  Leave it as a Lisp_Object
	     until it is ready to be displayed, since GC can happen while
	     menus are active.  */
	  if (!NILP (wv->help))
#ifdef USE_LISP_UNION_TYPE
	    info.dwItemData = (DWORD) (wv->help).i;
#else
	    info.dwItemData = (DWORD) (wv->help);
#endif
	  if (wv->button_type == BUTTON_TYPE_RADIO)
	    {
	      /* CheckMenuRadioItem allows us to differentiate TOGGLE and
		 RADIO items, but is not available on NT 3.51 and earlier.  */
	      info.fMask |= MIIM_TYPE | MIIM_STATE;
	      info.fType = MFT_RADIOCHECK | MFT_STRING;
	      info.dwTypeData = out_string;
	      info.fState = wv->selected ? MFS_CHECKED : MFS_UNCHECKED;
	    }

	  set_menu_item_info (menu,
			      item != NULL ? (UINT) item : (UINT) wv->call_data,
			      FALSE, &info);
	}
    }
  return return_value;
}

/* Construct native Windows menu(bar) based on widget_value tree.  */
static int
fill_in_menu (HMENU menu, widget_value *wv)
{
  for ( ; wv != NULL; wv = wv->next)
    {
      if (wv->contents)
	{
	  HMENU sub_menu = CreatePopupMenu ();

	  if (sub_menu == NULL)
	    return 0;

	  if (!fill_in_menu (sub_menu, wv->contents) ||
	      !add_menu_item (menu, wv, sub_menu))
	    {
	      DestroyMenu (sub_menu);
	      return 0;
	    }
	}
      else
	{
	  if (!add_menu_item (menu, wv, NULL))
	    return 0;
	}
    }
  return 1;
}

/* Display help string for currently pointed to menu item. Not
   supported on NT 3.51 and earlier, as GetMenuItemInfo is not
   available. */
void
w32_menu_display_help (HWND owner, HMENU menu, UINT item, UINT flags)
{
  if (get_menu_item_info)
    {
      struct frame *f = x_window_to_frame (&one_w32_display_info, owner);
      Lisp_Object frame, help;

      /* No help echo on owner-draw menu items, or when the keyboard is used
	 to navigate the menus, since tooltips are distracting if they pop
	 up elsewhere.  */
      if (flags & MF_OWNERDRAW || flags & MF_POPUP
	  || !(flags & MF_MOUSESELECT))
	help = Qnil;
      else
	{
	  MENUITEMINFO info;

	  memset (&info, 0, sizeof (info));
	  info.cbSize = sizeof (info);
	  info.fMask = MIIM_DATA;
	  get_menu_item_info (menu, item, FALSE, &info);

#ifdef USE_LISP_UNION_TYPE
	  help = info.dwItemData ? (Lisp_Object) ((EMACS_INT) info.dwItemData)
	                         : Qnil;
#else
	  help = info.dwItemData ? (Lisp_Object) info.dwItemData : Qnil;
#endif
	}

      /* Store the help echo in the keyboard buffer as the X toolkit
	 version does, rather than directly showing it. This seems to
	 solve the GC problems that were present when we based the
	 Windows code on the non-toolkit version.  */
      if (f)
	{
	  XSETFRAME (frame, f);
	  kbd_buffer_store_help_event (frame, help);
	}
      else
	/* X version has a loop through frames here, which doesn't
	   appear to do anything, unless it has some side effect.  */
	show_help_echo (help, Qnil, Qnil, Qnil);
    }
}

/* Free memory used by owner-drawn strings.  */
static void
w32_free_submenu_strings (HMENU menu)
{
  int i, num = GetMenuItemCount (menu);
  for (i = 0; i < num; i++)
    {
      MENUITEMINFO info;
      memset (&info, 0, sizeof (info));
      info.cbSize = sizeof (info);
      info.fMask = MIIM_DATA | MIIM_TYPE | MIIM_SUBMENU;

      get_menu_item_info (menu, i, TRUE, &info);

      /* Owner-drawn names are held in dwItemData.  */
      if ((info.fType & MF_OWNERDRAW) && info.dwItemData)
	{
#ifdef MENU_DEBUG
	  DebPrint ("Menu: freeing %ld for owner-draw", info.dwItemData);
#endif
	  local_free (info.dwItemData);
	}

      /* Recurse down submenus.  */
      if (info.hSubMenu)
	w32_free_submenu_strings (info.hSubMenu);
    }
}

void
w32_free_menu_strings (HWND hwnd)
{
  HMENU menu = current_popup_menu;

  if (get_menu_item_info)
    {
      /* If there is no popup menu active, free the strings from the frame's
	 menubar.  */
      if (!menu)
	menu = GetMenu (hwnd);

      if (menu)
	w32_free_submenu_strings (menu);
    }

  current_popup_menu = NULL;
}

#endif /* HAVE_MENUS */

/* The following is used by delayed window autoselection.  */

DEFUN ("menu-or-popup-active-p", Fmenu_or_popup_active_p, Smenu_or_popup_active_p, 0, 0, 0,
       doc: /* Return t if a menu or popup dialog is active on selected frame.  */)
  (void)
{
#ifdef HAVE_MENUS
  FRAME_PTR f;
  f = SELECTED_FRAME ();
  return (f->output_data.w32->menubar_active > 0) ? Qt : Qnil;
#else
  return Qnil;
#endif /* HAVE_MENUS */
}

void
syms_of_w32menu (void)
{
  globals_of_w32menu ();

  current_popup_menu = NULL;

  DEFSYM (Qdebug_on_next_call, "debug-on-next-call");

  defsubr (&Smenu_or_popup_active_p);
#ifdef HAVE_MENUS
  defsubr (&Sx_popup_dialog);
#endif
}

/*
	globals_of_w32menu is used to initialize those global variables that
	must always be initialized on startup even when the global variable
	initialized is non zero (see the function main in emacs.c).
	globals_of_w32menu is called from syms_of_w32menu when the global
	variable initialized is 0 and directly from main when initialized
	is non zero.
 */
void
globals_of_w32menu (void)
{
  /* See if Get/SetMenuItemInfo functions are available.  */
  HMODULE user32 = GetModuleHandle ("user32.dll");
  get_menu_item_info = (GetMenuItemInfoA_Proc) GetProcAddress (user32, "GetMenuItemInfoA");
  set_menu_item_info = (SetMenuItemInfoA_Proc) GetProcAddress (user32, "SetMenuItemInfoA");
  unicode_append_menu = (AppendMenuW_Proc) GetProcAddress (user32, "AppendMenuW");
  unicode_message_box = (MessageBoxW_Proc) GetProcAddress (user32, "MessageBoxW");
}