unofficial mirror of emacs-devel@gnu.org 
 help / color / mirror / code / Atom feed
blob d43360ec4ea72fd168374db587cc8604eef63598 45356 bytes (raw)
name: src/menu.c 	 # note: path name is non-authoritative(*)

   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
 
/* Platform-independent code for terminal communications.

Copyright (C) 1986, 1988, 1993-1994, 1996, 1999-2021 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 <https://www.gnu.org/licenses/>.  */

#include <config.h>
#include <limits.h> /* for INT_MAX */

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

#ifdef USE_X_TOOLKIT
#include "../lwlib/lwlib.h"
#endif

#ifdef HAVE_WINDOW_SYSTEM
#include TERM_HEADER
#endif /* HAVE_WINDOW_SYSTEM */

#ifdef HAVE_NTGUI
extern AppendMenuW_Proc unicode_append_menu;
#endif /* HAVE_NTGUI  */

#include "menu.h"

/* Return non-zero if menus can handle radio and toggle buttons.  */
static bool
have_boxes (void)
{
#if defined (USE_X_TOOLKIT) || defined (USE_GTK) || defined (HAVE_NTGUI) || defined(HAVE_NS)
  if (FRAME_WINDOW_P (XFRAME (Vmenu_updating_frame)))
    return 1;
#endif
  return 0;
}

Lisp_Object menu_items;

/* Whether the global vars defined here are already in use.
   Used to detect cases where we try to re-enter this non-reentrant code.  */
bool menu_items_inuse;

/* Number of slots currently allocated in menu_items.  */
int menu_items_allocated;

/* This is the index in menu_items of the first empty slot.  */
int menu_items_used;

/* The number of panes currently recorded in menu_items,
   excluding those within submenus.  */
int menu_items_n_panes;

/* Current depth within submenus.  */
static int menu_items_submenu_depth;

void
init_menu_items (void)
{
  if (menu_items_inuse)
    error ("Trying to use a menu from within a menu-entry");

  if (NILP (menu_items))
    {
      menu_items_allocated = 60;
      menu_items = make_nil_vector (menu_items_allocated);
    }

  menu_items_inuse = true;
  menu_items_used = 0;
  menu_items_n_panes = 0;
  menu_items_submenu_depth = 0;
}

/* Call at the end of generating the data in menu_items.  */

void
finish_menu_items (void)
{
}

void
unuse_menu_items (void)
{
  menu_items_inuse = false;
}

/* Call when finished using the data for the current menu
   in menu_items.  */

void
discard_menu_items (void)
{
  /* Free the structure if it is especially large.
     Otherwise, hold on to it, to save time.  */
  if (menu_items_allocated > 200)
    {
      menu_items = Qnil;
      menu_items_allocated = 0;
    }
  eassert (!menu_items_inuse);
}

/* This undoes save_menu_items, and it is called by the specpdl unwind
   mechanism.  */

static void
restore_menu_items (Lisp_Object saved)
{
  menu_items = XCAR (saved);
  menu_items_inuse = ! NILP (menu_items);
  menu_items_allocated = (VECTORP (menu_items) ? ASIZE (menu_items) : 0);
  saved = XCDR (saved);
  menu_items_used = XFIXNUM (XCAR (saved));
  saved = XCDR (saved);
  menu_items_n_panes = XFIXNUM (XCAR (saved));
  saved = XCDR (saved);
  menu_items_submenu_depth = XFIXNUM (XCAR (saved));
}

/* Push the whole state of menu_items processing onto the specpdl.
   It will be restored when the specpdl is unwound.  */

void
save_menu_items (void)
{
  Lisp_Object saved = list4 (menu_items_inuse ? menu_items : Qnil,
			     make_fixnum (menu_items_used),
			     make_fixnum (menu_items_n_panes),
			     make_fixnum (menu_items_submenu_depth));
  record_unwind_protect (restore_menu_items, saved);
  menu_items_inuse = false;
  menu_items = Qnil;
}

\f
/* Ensure that there is room for ITEMS items in the menu_items vector.  */

static void
ensure_menu_items (int items)
{
  int incr = items - (menu_items_allocated - menu_items_used);
  if (incr > 0)
    {
      menu_items = larger_vector (menu_items, incr, INT_MAX);
      menu_items_allocated = ASIZE (menu_items);
    }
}

#ifdef HAVE_EXT_MENU_BAR

/* Begin a submenu.  */

static void
push_submenu_start (void)
{
  ensure_menu_items (1);
  ASET (menu_items, menu_items_used, Qnil);
  menu_items_used++;
  menu_items_submenu_depth++;
}

/* End a submenu.  */

static void
push_submenu_end (void)
{
  ensure_menu_items (1);
  ASET (menu_items, menu_items_used, Qlambda);
  menu_items_used++;
  menu_items_submenu_depth--;
}

#endif /* HAVE_EXT_MENU_BAR */

/* Indicate boundary between left and right.  */

static void
push_left_right_boundary (void)
{
  ensure_menu_items (1);
  ASET (menu_items, menu_items_used, Qquote);
  menu_items_used++;
}

/* Start a new menu pane in menu_items.
   NAME is the pane name.  PREFIX_VEC is a prefix key for this pane.  */

static void
push_menu_pane (Lisp_Object name, Lisp_Object prefix_vec)
{
  ensure_menu_items (MENU_ITEMS_PANE_LENGTH);
  if (menu_items_submenu_depth == 0)
    menu_items_n_panes++;
  ASET (menu_items, menu_items_used, Qt);
  menu_items_used++;
  ASET (menu_items, menu_items_used, name);
  menu_items_used++;
  ASET (menu_items, menu_items_used, prefix_vec);
  menu_items_used++;
}

/* Push one menu item into the current pane.  NAME is the string to
   display.  ENABLE if non-nil means this item can be selected.  KEY
   is the key generated by choosing this item, or nil if this item
   doesn't really have a definition.  DEF is the definition of this
   item.  EQUIV is the textual description of the keyboard equivalent
   for this item (or nil if none).  TYPE is the type of this menu
   item, one of nil, `toggle' or `radio'. */

static void
push_menu_item (Lisp_Object name, Lisp_Object enable, Lisp_Object key, Lisp_Object def, Lisp_Object equiv, Lisp_Object type, Lisp_Object selected, Lisp_Object help)
{
  ensure_menu_items (MENU_ITEMS_ITEM_LENGTH);

  ASET (menu_items, menu_items_used + MENU_ITEMS_ITEM_NAME,	name);
  ASET (menu_items, menu_items_used + MENU_ITEMS_ITEM_ENABLE,	enable);
  ASET (menu_items, menu_items_used + MENU_ITEMS_ITEM_VALUE,	key);
  ASET (menu_items, menu_items_used + MENU_ITEMS_ITEM_EQUIV_KEY, equiv);
  ASET (menu_items, menu_items_used + MENU_ITEMS_ITEM_DEFINITION, def);
  ASET (menu_items, menu_items_used + MENU_ITEMS_ITEM_TYPE,	type);
  ASET (menu_items, menu_items_used + MENU_ITEMS_ITEM_SELECTED,	selected);
  ASET (menu_items, menu_items_used + MENU_ITEMS_ITEM_HELP,	help);

  menu_items_used += MENU_ITEMS_ITEM_LENGTH;
}

/* Args passed between single_keymap_panes and single_menu_item.  */
struct skp
  {
     Lisp_Object pending_maps;
     int maxdepth;
     int notbuttons;
  };

static void single_menu_item (Lisp_Object, Lisp_Object, Lisp_Object,
                              void *);

/* This is a recursive subroutine of keymap_panes.
   It handles one keymap, KEYMAP.
   The other arguments are passed along
   or point to local variables of the previous function.

   If we encounter submenus deeper than MAXDEPTH levels, ignore them.  */

static void
single_keymap_panes (Lisp_Object keymap, Lisp_Object pane_name,
		     Lisp_Object prefix, int maxdepth)
{
  struct skp skp;

  skp.pending_maps = Qnil;
  skp.maxdepth = maxdepth;
  skp.notbuttons = 0;

  if (maxdepth <= 0)
    return;

  push_menu_pane (pane_name, prefix);

  if (!have_boxes ())
    {
      /* Remember index for first item in this pane so we can go back
	 and add a prefix when (if) we see the first button.  After
	 that, notbuttons is set to 0, to mark that we have seen a
	 button and all non button items need a prefix.  */
      skp.notbuttons = menu_items_used;
    }

  map_keymap_canonical (keymap, single_menu_item, Qnil, &skp);

  /* Process now any submenus which want to be panes at this level.  */
  while (CONSP (skp.pending_maps))
    {
      Lisp_Object elt, eltcdr, string;
      elt = XCAR (skp.pending_maps);
      eltcdr = XCDR (elt);
      string = XCAR (eltcdr);
      /* We no longer discard the @ from the beginning of the string here.
	 Instead, we do this in *menu_show.  */
      single_keymap_panes (Fcar (elt), string, XCDR (eltcdr), maxdepth - 1);
      skp.pending_maps = XCDR (skp.pending_maps);
    }
}

/* This is a subroutine of single_keymap_panes that handles one
   keymap entry.
   KEY is a key in a keymap and ITEM is its binding.
   SKP->PENDING_MAPS_PTR is a list of keymaps waiting to be made into
   separate panes.
   If we encounter submenus deeper than SKP->MAXDEPTH levels, ignore them.  */

static void
single_menu_item (Lisp_Object key, Lisp_Object item, Lisp_Object dummy, void *skp_v)
{
  Lisp_Object map, item_string, enabled;
  bool res;
  struct skp *skp = skp_v;

  /* Parse the menu item and leave the result in item_properties.  */
  res = parse_menu_item (item, 0);
  if (!res)
    return;			/* Not a menu item.  */

  map = AREF (item_properties, ITEM_PROPERTY_MAP);

  enabled = AREF (item_properties, ITEM_PROPERTY_ENABLE);
  item_string = AREF (item_properties, ITEM_PROPERTY_NAME);

  if (!NILP (map) && SREF (item_string, 0) == '@')
    {
      if (!NILP (enabled))
	/* An enabled separate pane. Remember this to handle it later.  */
	skp->pending_maps = Fcons (Fcons (map, Fcons (item_string, key)),
				   skp->pending_maps);
      return;
    }

  /* Simulate radio buttons and toggle boxes by putting a prefix in
     front of them.  */
  if (!have_boxes ())
    {
      char const *prefix = 0;
      Lisp_Object type = AREF (item_properties, ITEM_PROPERTY_TYPE);
      if (!NILP (type))
	{
	  Lisp_Object selected
	    = AREF (item_properties, ITEM_PROPERTY_SELECTED);

	  if (skp->notbuttons)
	    /* The first button. Line up previous items in this menu.  */
	    {
	      int idx = skp->notbuttons; /* Index for first item this menu.  */
	      int submenu = 0;
	      Lisp_Object tem;
	      while (idx < menu_items_used)
		{
		  tem
		    = AREF (menu_items, idx + MENU_ITEMS_ITEM_NAME);
		  if (NILP (tem))
		    {
		      idx++;
		      submenu++;		/* Skip sub menu.  */
		    }
		  else if (EQ (tem, Qlambda))
		    {
		      idx++;
		      submenu--;		/* End sub menu.  */
		    }
		  else if (EQ (tem, Qt))
		    idx += 3;		/* Skip new pane marker. */
		  else if (EQ (tem, Qquote))
		    idx++;		/* Skip a left, right divider. */
		  else
		    {
		      if (!submenu && SREF (tem, 0) != '\0'
			  && SREF (tem, 0) != '-')
			{
			  AUTO_STRING (spaces, "    ");
			  ASET (menu_items, idx + MENU_ITEMS_ITEM_NAME,
				concat2 (spaces, tem));
			}
		      idx += MENU_ITEMS_ITEM_LENGTH;
		    }
		}
	      skp->notbuttons = 0;
	    }

	  /* Calculate prefix, if any, for this item.  */
	  if (EQ (type, QCtoggle))
	    prefix = NILP (selected) ? "[ ] " : "[X] ";
	  else if (EQ (type, QCradio))
	    prefix = NILP (selected) ? "( ) " : "(*) ";
	}
      /* Not a button. If we have earlier buttons, then we need a prefix.  */
      else if (!skp->notbuttons && SREF (item_string, 0) != '\0'
	       && SREF (item_string, 0) != '-')
	prefix = "    ";

      if (prefix)
	{
	  AUTO_STRING_WITH_LEN (prefix_obj, prefix, 4);
	  item_string = concat2 (prefix_obj, item_string);
	}
  }

  if ((FRAME_TERMCAP_P (XFRAME (Vmenu_updating_frame))
       || FRAME_MSDOS_P (XFRAME (Vmenu_updating_frame)))
      && !NILP (map))
    /* Indicate visually that this is a submenu.  */
    {
      AUTO_STRING (space_gt, " >");
      item_string = concat2 (item_string, space_gt);
    }

  push_menu_item (item_string, enabled, key,
		  AREF (item_properties, ITEM_PROPERTY_DEF),
		  AREF (item_properties, ITEM_PROPERTY_KEYEQ),
		  AREF (item_properties, ITEM_PROPERTY_TYPE),
		  AREF (item_properties, ITEM_PROPERTY_SELECTED),
		  AREF (item_properties, ITEM_PROPERTY_HELP));

#if defined (USE_X_TOOLKIT) || defined (USE_GTK) || defined (HAVE_NS) || defined (HAVE_NTGUI)
  /* Display a submenu using the toolkit.  */
  if (FRAME_WINDOW_P (XFRAME (Vmenu_updating_frame))
      && ! (NILP (map) || NILP (enabled)))
    {
      push_submenu_start ();
      single_keymap_panes (map, Qnil, key, skp->maxdepth - 1);
      push_submenu_end ();
    }
#endif
}

/* Look through KEYMAPS, a vector of keymaps that is NMAPS long,
   and generate menu panes for them in menu_items.  */

static void
keymap_panes (Lisp_Object *keymaps, ptrdiff_t nmaps)
{
  ptrdiff_t mapno;

  init_menu_items ();

  /* Loop over the given keymaps, making a pane for each map.
     But don't make a pane that is empty--ignore that map instead.
     P is the number of panes we have made so far.  */
  for (mapno = 0; mapno < nmaps; mapno++)
    single_keymap_panes (keymaps[mapno],
			 Fkeymap_prompt (keymaps[mapno]), Qnil, 10);

  finish_menu_items ();
}

/* Encode a menu string as appropriate for menu-updating-frame's type.  */
static Lisp_Object
encode_menu_string (Lisp_Object str)
{
  /* TTY menu strings are encoded by write_glyphs, when they are
     delivered to the glass, so no need to encode them here.  */
  if (FRAME_TERMCAP_P (XFRAME (Vmenu_updating_frame)))
    return str;
  return ENCODE_MENU_STRING (str);
}

/* Push the items in a single pane defined by the alist PANE.  */
static void
list_of_items (Lisp_Object pane)
{
  Lisp_Object tail, item, item1;

  for (tail = pane; CONSP (tail); tail = XCDR (tail))
    {
      item = XCAR (tail);
      if (STRINGP (item))
	push_menu_item (encode_menu_string (item), Qnil, Qnil, Qt,
			Qnil, Qnil, Qnil, Qnil);
      else if (CONSP (item))
	{
	  item1 = XCAR (item);
	  CHECK_STRING (item1);
	  push_menu_item (encode_menu_string (item1), Qt, XCDR (item),
			  Qt, Qnil, Qnil, Qnil, Qnil);
	}
      else
	push_left_right_boundary ();

    }
}

/* Push all the panes and items of a menu described by the
   alist-of-alists MENU.
   This handles old-fashioned calls to x-popup-menu.  */
void
list_of_panes (Lisp_Object menu)
{
  Lisp_Object tail;

  init_menu_items ();

  for (tail = menu; CONSP (tail); tail = XCDR (tail))
    {
      Lisp_Object elt, pane_name, pane_data;
      elt = XCAR (tail);
      pane_name = Fcar (elt);
      CHECK_STRING (pane_name);
      push_menu_pane (encode_menu_string (pane_name), Qnil);
      pane_data = Fcdr (elt);
      CHECK_CONS (pane_data);
      list_of_items (pane_data);
    }

  finish_menu_items ();
}

/* Set up data in menu_items for a menu bar item
   whose event type is ITEM_KEY (with string ITEM_NAME)
   and whose contents come from the list of keymaps MAPS.  */
bool
parse_single_submenu (Lisp_Object item_key, Lisp_Object item_name,
		      Lisp_Object maps)
{
  Lisp_Object *mapvec;
  bool top_level_items = 0;
  USE_SAFE_ALLOCA;

  ptrdiff_t len = list_length (maps);

  /* Convert the list MAPS into a vector MAPVEC.  */
  SAFE_ALLOCA_LISP (mapvec, len);
  for (ptrdiff_t i = 0; i < len; i++)
    {
      mapvec[i] = Fcar (maps);
      maps = Fcdr (maps);
    }

  /* Loop over the given keymaps, making a pane for each map.
     But don't make a pane that is empty--ignore that map instead.  */
  for (ptrdiff_t i = 0; i < len; i++)
    {
      if (!KEYMAPP (mapvec[i]))
	{
	  /* Here we have a command at top level in the menu bar
	     as opposed to a submenu.  */
	  top_level_items = 1;
	  push_menu_pane (Qnil, Qnil);
	  push_menu_item (item_name, Qt, item_key, mapvec[i],
			  Qnil, Qnil, Qnil, Qnil);
	}
      else
	{
	  Lisp_Object prompt;
	  prompt = Fkeymap_prompt (mapvec[i]);
	  single_keymap_panes (mapvec[i],
			       !NILP (prompt) ? prompt : item_name,
			       item_key, 10);
	}
    }

  SAFE_FREE ();
  return top_level_items;
}

\f
#if defined (USE_X_TOOLKIT) || defined (USE_GTK) || defined (HAVE_NS) || defined (HAVE_NTGUI)

/* Allocate and basically initialize widget_value, blocking input.  */

widget_value *
make_widget_value (const char *name, char *value,
		   bool enabled, Lisp_Object help)
{
  widget_value *wv;

  block_input ();
  wv = xzalloc (sizeof (widget_value));
  unblock_input ();

  wv->name = (char *) name;
  wv->value = value;
  wv->enabled = enabled;
  wv->help = help;
  return wv;
}

/* This recursively calls xfree on the tree of widgets.
   It must free all data that was malloc'ed for these widget_values.
   In Emacs, many slots are pointers into the data of Lisp_Strings, and
   must be left alone.  */

void
free_menubar_widget_value_tree (widget_value *wv)
{
  if (! wv) return;

  wv->name = wv->value = wv->key = (char *) 0xDEADBEEF;

  if (wv->contents && (wv->contents != (widget_value *) 1))
    {
      free_menubar_widget_value_tree (wv->contents);
      wv->contents = (widget_value *) 0xDEADBEEF;
    }
  if (wv->next)
    {
      free_menubar_widget_value_tree (wv->next);
      wv->next = (widget_value *) 0xDEADBEEF;
    }
  block_input ();
  xfree (wv);
  unblock_input ();
}

/* Create a tree of widget_value objects
   representing the panes and items
   in menu_items starting at index START, up to index END.  */

widget_value *
digest_single_submenu (int start, int end, bool top_level_items)
{
  widget_value *wv, *prev_wv, *save_wv, *first_wv;
  int i;
  int submenu_depth = 0;
  widget_value **submenu_stack;
  bool panes_seen = 0;
  struct frame *f = XFRAME (Vmenu_updating_frame);
  USE_SAFE_ALLOCA;

  SAFE_NALLOCA (submenu_stack, 1, menu_items_used);
  wv = make_widget_value ("menu", NULL, true, Qnil);
  wv->button_type = BUTTON_TYPE_NONE;
  first_wv = wv;
  save_wv = 0;
  prev_wv = 0;

  /* Loop over all panes and items made by the preceding call
     to parse_single_submenu and construct a tree of widget_value objects.
     Ignore the panes and items used by previous calls to
     digest_single_submenu, even though those are also in menu_items.  */
  i = start;
  while (i < end)
    {
      if (NILP (AREF (menu_items, i)))
	{
	  submenu_stack[submenu_depth++] = save_wv;
	  save_wv = prev_wv;
	  prev_wv = 0;
	  i++;
	}
      else if (EQ (AREF (menu_items, i), Qlambda))
	{
	  prev_wv = save_wv;
	  save_wv = submenu_stack[--submenu_depth];
	  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;
	  const char *pane_string;

	  panes_seen = 1;

	  pane_name = AREF (menu_items, i + MENU_ITEMS_PANE_NAME);

	  /* TTY menus display menu items via tty_write_glyphs, which
	     will encode the strings as appropriate.  */
	  if (!FRAME_TERMCAP_P (f))
	    {
#ifdef HAVE_NTGUI
	      if (STRINGP (pane_name))
		{
		  if (unicode_append_menu)
		    /* Encode as UTF-8 for now.  */
		    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);
		}
#elif defined (USE_LUCID) && (defined USE_CAIRO || defined HAVE_XFT)
	      if (STRINGP (pane_name))
		{
		  pane_name = ENCODE_UTF_8 (pane_name);
		  ASET (menu_items, i + MENU_ITEMS_PANE_NAME, pane_name);
		}
#elif !defined (HAVE_MULTILINGUAL_MENU)
	      if (STRINGP (pane_name) && STRING_MULTIBYTE (pane_name))
		{
		  pane_name = ENCODE_MENU_STRING (pane_name);
		  ASET (menu_items, i + MENU_ITEMS_PANE_NAME, pane_name);
		}
#endif
	    }

	  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 (strcmp (pane_string, ""))
	    {
	      /* Set value to 1 so update_submenu_strings can handle '@'.  */
	      wv = make_widget_value (NULL, (char *) 1, true, Qnil);
	      if (save_wv)
		save_wv->next = wv;
	      else
		first_wv->contents = wv;
	      wv->lname = pane_name;
	      wv->button_type = BUTTON_TYPE_NONE;
	      save_wv = wv;
	    }
	  else
	    save_wv = first_wv;

	  prev_wv = 0;
	  i += MENU_ITEMS_PANE_LENGTH;
	}
      else
	{
	  /* Create a new item within current pane.  */
	  Lisp_Object item_name, enable, descrip, def, type, selected;
	  Lisp_Object help;

	  /* All items should be contained in panes.  */
	  if (! panes_seen)
	    emacs_abort ();

	  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);

	  /* TTY menu items and their descriptions will be encoded by
	     tty_write_glyphs.  */
	  if (!FRAME_TERMCAP_P (f))
	    {
#ifdef HAVE_NTGUI
	      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);
		}
#elif USE_LUCID
	      if (STRINGP (item_name))
		{
		  item_name = ENCODE_UTF_8 (item_name);
		  ASET (menu_items, i + MENU_ITEMS_ITEM_NAME, item_name);
		}

	      if (STRINGP (descrip))
		{
		  descrip = ENCODE_UTF_8 (descrip);
		  ASET (menu_items, i + MENU_ITEMS_ITEM_EQUIV_KEY, descrip);
		}
#elif !defined (HAVE_MULTILINGUAL_MENU)
	      if (STRING_MULTIBYTE (item_name))
		{
		  item_name = ENCODE_MENU_STRING (item_name);
		  ASET (menu_items, i + MENU_ITEMS_ITEM_NAME, item_name);
		}

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

	  wv = make_widget_value (NULL, NULL, !NILP (enable),
				  STRINGP (help) ? help : Qnil);
	  if (prev_wv)
	    prev_wv->next = wv;
	  else
	    save_wv->contents = wv;

	  wv->lname = item_name;
	  if (!NILP (descrip))
	    wv->lkey = descrip;
	  /* The intptr_t cast avoids a warning.  There's no problem
	     as long as pointers have enough bits to hold small integers.  */
	  wv->call_data = (!NILP (def) ? (void *) (intptr_t) i : 0);

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

	  wv->selected = !NILP (selected);

	  prev_wv = wv;

	  i += MENU_ITEMS_ITEM_LENGTH;
	}
    }

  /* If we have just one "menu item"
     that was originally a button, return it by itself.  */
  if (top_level_items && first_wv->contents && first_wv->contents->next == 0)
    {
      wv = first_wv;
      first_wv = first_wv->contents;
      xfree (wv);
    }

  SAFE_FREE ();
  return first_wv;
}

/* Walk through the widget_value tree starting at FIRST_WV and update
   the char * pointers from the corresponding lisp values.
   We do this after building the whole tree, since GC may happen while the
   tree is constructed, and small strings are relocated.  So we must wait
   until no GC can happen before storing pointers into lisp values.  */
void
update_submenu_strings (widget_value *first_wv)
{
  widget_value *wv;

  for (wv = first_wv; wv; wv = wv->next)
    {
      if (STRINGP (wv->lname))
        {
          wv->name = SSDATA (wv->lname);

          /* Ignore the @ that means "separate pane".
             This is a kludge, but this isn't worth more time.  */
          if (wv->value == (char *)1)
            {
              if (wv->name[0] == '@')
		wv->name++;
              wv->value = 0;
            }
        }

      if (STRINGP (wv->lkey))
        wv->key = SSDATA (wv->lkey);

      if (wv->contents)
        update_submenu_strings (wv->contents);
    }
}

/* Find the menu selection and store it in the keyboard buffer.
   F is the frame the menu is on.
   MENU_BAR_ITEMS_USED is the length of VECTOR.
   VECTOR is an array of menu events for the whole menu.  */

void
find_and_call_menu_selection (struct frame *f, int menu_bar_items_used,
			      Lisp_Object vector, void *client_data)
{
  Lisp_Object prefix, entry;
  Lisp_Object *subprefix_stack;
  int submenu_depth = 0;
  int i;
  USE_SAFE_ALLOCA;

  entry = Qnil;
  SAFE_NALLOCA (subprefix_stack, 1, menu_bar_items_used);
  prefix = Qnil;
  i = 0;

  while (i < menu_bar_items_used)
    {
      if (NILP (AREF (vector, i)))
	{
	  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);
	  /* Treat the pointer as an integer.  There's no problem
	     as long as pointers have enough bits to hold small integers.  */
	  if ((intptr_t) 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;
	      kbd_buffer_store_event (&buf);

	      break;
	    }
	  i += MENU_ITEMS_ITEM_LENGTH;
	}
    }

  SAFE_FREE ();
}

#endif /* USE_X_TOOLKIT || USE_GTK || HAVE_NS || HAVE_NTGUI */

#ifdef HAVE_NS
/* As above, but return the menu selection instead of storing in kb buffer.
   If KEYMAPS, return full prefixes to selection. */
Lisp_Object
find_and_return_menu_selection (struct frame *f, bool keymaps, void *client_data)
{
  Lisp_Object prefix, entry;
  int i;
  Lisp_Object *subprefix_stack;
  int submenu_depth = 0;
  USE_SAFE_ALLOCA;

  prefix = entry = Qnil;
  i = 0;
  SAFE_ALLOCA_LISP (subprefix_stack, menu_items_used);

  while (i < menu_items_used)
    {
      if (NILP (AREF (menu_items, i)))
        {
          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 (aref_addr (menu_items, i) == client_data)
            {
              if (keymaps)
                {
                  int j;

                  entry = list1 (entry);
                  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);
                }
	      SAFE_FREE ();
              return entry;
            }
          i += MENU_ITEMS_ITEM_LENGTH;
        }
    }
  SAFE_FREE ();
  return Qnil;
}
#endif  /* HAVE_NS */

ptrdiff_t
menu_item_width (const unsigned char *str)
{
  ptrdiff_t len;
  const unsigned char *p;

  for (len = 0, p = str; *p; )
    {
      int ch_len, ch = string_char_and_length (p, &ch_len);
      len += CHARACTER_WIDTH (ch);
      p += ch_len;
    }
  return len;
}

DEFUN ("menu-bar-menu-at-x-y", Fmenu_bar_menu_at_x_y, Smenu_bar_menu_at_x_y,
       2, 3, 0,
       doc: /* Return the menu-bar menu on FRAME at pixel coordinates X, Y.
X and Y are frame-relative pixel coordinates, assumed to define
a location within the menu bar.
If FRAME is nil or omitted, it defaults to the selected frame.

Value is the symbol of the menu at X/Y, or nil if the specified
coordinates are not within the FRAME's menu bar.  The symbol can
be used to look up the menu like this:

     (lookup-key MAP [menu-bar SYMBOL])

where MAP is either the current global map or the current local map,
since menu-bar items come from both.

This function can return non-nil only on a text-terminal frame
or on an X frame that doesn't use any GUI toolkit.  Otherwise,
Emacs does not manage the menu bar and cannot convert coordinates
into menu items.  */)
  (Lisp_Object x, Lisp_Object y, Lisp_Object frame)
{
  int row, col;
  struct frame *f = decode_any_frame (frame);

  if (!FRAME_LIVE_P (f))
    return Qnil;

  pixel_to_glyph_coords (f, XFIXNUM (x), XFIXNUM (y), &col, &row, NULL, 1);
  if (0 <= row && row < FRAME_MENU_BAR_LINES (f))
    {
      Lisp_Object items, item;
      int i;

      /* Find the menu bar item under `col'.  */
      item = Qnil;
      items = FRAME_MENU_BAR_ITEMS (f);
      /* This loop assumes a single menu-bar line, and will fail to
	 find an item if it is not in the first line.  Note that
	 make_lispy_event in keyboard.c makes the same assumption.  */
      for (i = 0; i < ASIZE (items); i += 4)
	{
	  Lisp_Object pos, str;

	  str = AREF (items, i + 1);
	  pos = AREF (items, i + 3);
	  if (NILP (str))
	    return item;
	  if (XFIXNUM (pos) <= col
	      /* We use <= so the blank between 2 items on a TTY is
		 considered part of the previous item.  */
	      && col <= XFIXNUM (pos) + menu_item_width (SDATA (str)))
	    {
	      item = AREF (items, i);
	      return item;
	    }
	}
    }
  return Qnil;
}

Lisp_Object
x_popup_menu_1 (Lisp_Object position, Lisp_Object menu)
{
  Lisp_Object keymap, tem, tem2;
  int xpos = 0, ypos = 0;
  Lisp_Object title;
  const char *error_name = NULL;
  Lisp_Object selection = Qnil;
  struct frame *f = NULL;
  Lisp_Object x, y, window;
  int menuflags = 0;
  ptrdiff_t specpdl_count = SPECPDL_INDEX ();

  if (NILP (position))
    /* This is an obsolete call, which wants us to precompute the
       keybinding equivalents, but we don't do that any more anyway.  */
    return Qnil;

  {
    bool get_current_pos_p = 0;

    /* Decode the first argument: find the window and the coordinates.  */
    if (EQ (position, Qt)
	|| (CONSP (position) && (EQ (XCAR (position), Qmenu_bar)
				 || EQ (XCAR (position), Qtab_bar)
				 || EQ (XCAR (position), Qtool_bar))))
      {
	get_current_pos_p = 1;
      }
    else
      {
	tem = Fcar (position);
	if (CONSP (tem))
	  {
	    window = Fcar (Fcdr (position));
	    x = XCAR (tem);
	    y = Fcar (XCDR (tem));
	  }
	else
	  {
	    menuflags |= MENU_FOR_CLICK;
	    tem = Fcar (XCDR (position));    /* EVENT_START (position) */
	    window = Fcar (tem);	     /* POSN_WINDOW (tem) */
	    tem2 = Fcar (Fcdr (tem));	     /* POSN_POSN (tem) */
	    /* The MENU_KBD_NAVIGATION field is set when the menu
	       was invoked by F10, which probably means they have no
	       mouse.  In that case, we let them switch between
	       top-level menu-bar menus by using C-f/C-b and
	       horizontal arrow keys, since they cannot click the
	       mouse to open a different submenu.  This flag is only
	       supported by tty_menu_show.  We set it when POSITION
	       and last_nonmenu_event are different, which means we
	       constructed POSITION by hand (in popup-menu, see
	       menu-bar.el) to look like a mouse click on the menu bar
	       event.  */
	    if (!EQ (POSN_POSN (last_nonmenu_event),
		     POSN_POSN (position))
		&& CONSP (tem2) && EQ (XCAR (tem2), Qmenu_bar))
	      menuflags |= MENU_KBD_NAVIGATION;
	    tem = Fcar (Fcdr (Fcdr (tem))); /* POSN_WINDOW_POSN (tem) */
	    x = Fcar (tem);
	    y = Fcdr (tem);
	  }

	/* If a click happens in an external tool bar or a detached
	   tool bar, x and y is NIL.  In that case, use the current
	   mouse position.  This happens for the help button in the
	   tool bar.  Ideally popup-menu should pass NIL to
	   this function, but it doesn't.  */
	if (NILP (x) && NILP (y))
	  get_current_pos_p = 1;
      }

    if (get_current_pos_p)
      {
	/* Use the mouse's current position.  */
	struct frame *new_f = SELECTED_FRAME ();

	XSETFASTINT (x, 0);
	XSETFASTINT (y, 0);
#ifdef HAVE_X_WINDOWS
	if (FRAME_X_P (new_f))
	  {
	    /* Can't use mouse_position_hook for X since it returns
	       coordinates relative to the window the mouse is in,
	       we need coordinates relative to the edit widget always.  */
	    if (new_f != 0)
	      {
		int cur_x, cur_y;

		x_relative_mouse_position (new_f, &cur_x, &cur_y);
		/* cur_x/y may be negative, so use make_fixnum.  */
		x = make_fixnum (cur_x);
		y = make_fixnum (cur_y);
	      }
	  }
	else
#endif /* HAVE_X_WINDOWS */
	  {
	    Lisp_Object bar_window;
	    enum scroll_bar_part part;
	    Time time;
	    void (*mouse_position_hook) (struct frame **, int,
					 Lisp_Object *,
					 enum scroll_bar_part *,
					 Lisp_Object *,
					 Lisp_Object *,
					 Time *) =
	      FRAME_TERMINAL (new_f)->mouse_position_hook;

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

	if (new_f != 0)
	  XSETFRAME (window, new_f);
	else
	  {
	    window = selected_window;
	    XSETFASTINT (x, 0);
	    XSETFASTINT (y, 0);
	  }
      }

    /* Decode where to put the menu.  */

    if (FRAMEP (window))
      {
	f = XFRAME (window);
	xpos = 0;
	ypos = 0;
      }
    else if (WINDOWP (window))
      {
	struct window *win = XWINDOW (window);
	CHECK_LIVE_WINDOW (window);
	f = XFRAME (WINDOW_FRAME (win));

	xpos = WINDOW_LEFT_EDGE_X (win);
	ypos = WINDOW_TOP_EDGE_Y (win);
      }
    else
      /* ??? Not really clean; should be CHECK_WINDOW_OR_FRAME,
	 but I don't want to make one now.  */
      CHECK_WINDOW (window);

    xpos += check_integer_range (x,
				 (xpos < INT_MIN - MOST_NEGATIVE_FIXNUM
				  ? (EMACS_INT) INT_MIN - xpos
				  : MOST_NEGATIVE_FIXNUM),
				 INT_MAX - xpos);
    ypos += check_integer_range (y,
				 (ypos < INT_MIN - MOST_NEGATIVE_FIXNUM
				  ? (EMACS_INT) INT_MIN - ypos
				  : MOST_NEGATIVE_FIXNUM),
				 INT_MAX - ypos);

    XSETFRAME (Vmenu_updating_frame, f);
  }

  /* Now parse the lisp menus.  */
  record_unwind_protect_void (unuse_menu_items);

  title = Qnil;

  /* Decode the menu items from what was specified.  */

  keymap = get_keymap (menu, 0, 0);
  if (CONSP (keymap))
    {
      /* We were given a keymap.  Extract menu info from the keymap.  */
      Lisp_Object prompt;

      /* Extract the detailed info to make one pane.  */
      keymap_panes (&menu, 1);

      /* Search for a string appearing directly as an element of the keymap.
	 That string is the title of the menu.  */
      prompt = Fkeymap_prompt (keymap);

#if defined (USE_GTK) || defined (HAVE_NS)
      if (STRINGP (prompt)
	  && SCHARS (prompt) > 0
	  && !NILP (Fget_text_property (make_fixnum (0), Qhide, prompt)))
	title = Qnil;
      else
#endif
      if (!NILP (prompt))
	title = prompt;

      /* Make that be the pane title of the first pane.  */
      if (!NILP (prompt) && menu_items_n_panes >= 0)
	ASET (menu_items, MENU_ITEMS_PANE_NAME, prompt);

      menuflags |= MENU_KEYMAPS;
    }
  else if (CONSP (menu) && KEYMAPP (XCAR (menu)))
    {
      /* We were given a list of keymaps.  */
      ptrdiff_t nmaps = list_length (menu);
      Lisp_Object *maps;
      ptrdiff_t i;
      USE_SAFE_ALLOCA;

      SAFE_ALLOCA_LISP (maps, nmaps);
      title = Qnil;

      /* The first keymap that has a prompt string
	 supplies the menu title.  */
      for (tem = menu, i = 0; CONSP (tem); tem = XCDR (tem))
	{
	  Lisp_Object prompt;

	  maps[i++] = keymap = get_keymap (XCAR (tem), 1, 0);

	  prompt = Fkeymap_prompt (keymap);
	  if (NILP (title) && !NILP (prompt))
	    title = prompt;
	}

      /* Extract the detailed info to make one pane.  */
      keymap_panes (maps, nmaps);

      /* Make the title be the pane title of the first pane.  */
      if (!NILP (title) && menu_items_n_panes >= 0)
	ASET (menu_items, MENU_ITEMS_PANE_NAME, title);

      menuflags |= MENU_KEYMAPS;

      SAFE_FREE ();
    }
  else
    {
      /* We were given an old-fashioned menu.  */
      title = Fcar (menu);
      CHECK_STRING (title);

      list_of_panes (Fcdr (menu));

      menuflags &= ~MENU_KEYMAPS;
    }

  unbind_to (specpdl_count, Qnil);

#ifdef HAVE_WINDOW_SYSTEM
  /* Hide a previous tip, if any.  */
  if (!FRAME_TERMCAP_P (f))
    Fx_hide_tip ();
#endif

#ifdef HAVE_NTGUI     /* FIXME: Is it really w32-specific?  --Stef  */
  /* If resources from a previous popup menu still exist, does nothing
     until the `menu_free_timer' has freed them (see w32fns.c). This
     can occur if you press ESC or click outside a menu without selecting
     a menu item.
  */
  if (current_popup_menu && FRAME_W32_P (f))
    {
      discard_menu_items ();
      FRAME_DISPLAY_INFO (f)->grabbed = 0;
      return Qnil;
    }
#endif

#ifdef HAVE_NS			/* FIXME: ns-specific, why? --Stef  */
  record_unwind_protect_void (discard_menu_items);
#endif

  /* Display them in a menu, but not if F is the initial frame that
     doesn't have its hooks set (e.g., in a batch session), because
     such a frame cannot display menus.  */
  if (!FRAME_INITIAL_P (f))
    selection = FRAME_TERMINAL (f)->menu_show_hook (f, xpos, ypos, menuflags,
						    title, &error_name);

#ifdef HAVE_NS
  unbind_to (specpdl_count, Qnil);
#else
  discard_menu_items ();
#endif

#ifdef HAVE_NTGUI     /* FIXME: Is it really w32-specific?  --Stef  */
  if (FRAME_W32_P (f))
    FRAME_DISPLAY_INFO (f)->grabbed = 0;
#endif

  if (error_name) error ("%s", error_name);
  return selection;
}

DEFUN ("x-popup-menu", Fx_popup_menu, Sx_popup_menu, 2, 2, 0,
       doc: /* Pop up a deck-of-cards menu and return user's selection.
POSITION is a position specification.  This is either a mouse button event
or a list ((XOFFSET YOFFSET) WINDOW)
where XOFFSET and YOFFSET are positions in pixels from the top left
corner of WINDOW.  (WINDOW may be a window or a frame object.)
This controls the position of the top left of the menu as a whole.
If POSITION is t, it means to use the current mouse position.

MENU is a specifier for a menu.  For the simplest case, MENU is a keymap.
The menu items come from key bindings that have a menu string as well as
a definition; actually, the "definition" in such a key binding looks like
\(STRING . REAL-DEFINITION).  To give the menu a title, put a string into
the keymap as a top-level element.

If REAL-DEFINITION is nil, that puts a nonselectable string in the menu.
Otherwise, REAL-DEFINITION should be a valid key binding definition.

You can also use a list of keymaps as MENU.
  Then each keymap makes a separate pane.

When MENU is a keymap or a list of keymaps, the return value is the
list of events corresponding to the user's choice. Note that
`x-popup-menu' does not actually execute the command bound to that
sequence of events.

Alternatively, you can specify a menu of multiple panes
  with a list of the form (TITLE PANE1 PANE2...),
where each pane is a list of form (TITLE ITEM1 ITEM2...).
Each ITEM is normally a cons cell (STRING . VALUE);
but a string can appear as an item--that makes a nonselectable line
in the menu.
With this form of menu, the return value is VALUE from the chosen item.

If POSITION is nil, don't display the menu at all, just precalculate the
cached information about equivalent key sequences.

If the user gets rid of the menu without making a valid choice, for
instance by clicking the mouse away from a valid choice or by typing
keyboard input, then this normally results in a quit and
`x-popup-menu' does not return.  But if POSITION is a mouse button
event (indicating that the user invoked the menu with the mouse) then
no quit occurs and `x-popup-menu' returns nil.  */)
  (Lisp_Object position, Lisp_Object menu)
{
  init_raw_keybuf_count ();
  return x_popup_menu_1 (position, menu);
}

/* If F's terminal is not capable of displaying a popup dialog,
   emulate it with a menu.  */

static Lisp_Object
emulate_dialog_with_menu (struct frame *f, Lisp_Object contents)
{
  Lisp_Object x, y, frame, newpos, prompt = Fcar (contents);
  int x_coord, y_coord;

  if (FRAME_WINDOW_P (f))
    {
      x_coord = FRAME_PIXEL_WIDTH (f);
      y_coord = FRAME_PIXEL_HEIGHT (f);
    }
  else
    {
      x_coord = FRAME_COLS (f);
      /* Center the title at frame middle.  (TTY menus have
	 their upper-left corner at the given position.)  */
      if (STRINGP (prompt))
	x_coord -= SCHARS (prompt);
      y_coord = FRAME_TOTAL_LINES (f);
    }

  XSETFRAME (frame, f);
  XSETINT (x, x_coord / 2);
  XSETINT (y, y_coord / 2);
  newpos = list2 (list2 (x, y), frame);

  return Fx_popup_menu (newpos, list2 (prompt, contents));
}

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 (DIALOG 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".

If the user gets rid of the dialog box without making a valid choice,
for instance using the window manager, then this produces a quit and
`x-popup-dialog' does not return.  */)
  (Lisp_Object position, Lisp_Object contents, Lisp_Object header)
{
  struct frame *f = NULL;
  Lisp_Object window;

  /* 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), Qtab_bar)
			       || EQ (XCAR (position), Qtool_bar))))
    window = selected_window;
  else if (CONSP (position))
    {
      Lisp_Object tem = XCAR (position);
      if (CONSP (tem))
	window = Fcar (XCDR (position));
      else
	{
	  tem = Fcar (XCDR (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);

  /* Note that xw_popup_dialog can call menu code, so
     Vmenu_updating_frame should be set (Bug#17891).  */
  eassume (f && FRAME_LIVE_P (f));
  XSETFRAME (Vmenu_updating_frame, f);

  /* Force a redisplay before showing the dialog.  If a frame is created
     just before showing the dialog, its contents may not have been fully
     drawn, as this depends on timing of events from the X server.  Redisplay
     is not done when a dialog is shown.  If redisplay could be done in the
     X event loop (i.e. the X event loop does not run in a signal handler)
     this would not be needed.

     Do this before creating the widget value that points to Lisp
     string contents, because Fredisplay may GC and relocate them.  */
  Fredisplay (Qt);

  /* Display the popup dialog by a terminal-specific hook ... */
  if (FRAME_TERMINAL (f)->popup_dialog_hook)
    {
      Lisp_Object selection
	= FRAME_TERMINAL (f)->popup_dialog_hook (f, header, contents);
#ifdef HAVE_NTGUI
      /* NTGUI supports only simple dialogs with Yes/No choices.  For
	 other dialogs, it returns the symbol 'unsupported--w32-dialog',
	 as a signal for the caller to fall back to the emulation code.  */
      if (!EQ (selection, Qunsupported__w32_dialog))
#endif
	return selection;
    }
  /* ... or emulate it with a menu.  */
  return emulate_dialog_with_menu (f, contents);
}

void
syms_of_menu (void)
{
  menu_items = Qnil;
  staticpro (&menu_items);

  DEFSYM (Qhide, "hide");

  defsubr (&Sx_popup_menu);
  defsubr (&Sx_popup_dialog);
  defsubr (&Smenu_bar_menu_at_x_y);
}

debug log:

solving d43360ec4e ...
found d43360ec4e in https://git.savannah.gnu.org/cgit/emacs.git

(*) Git path names are given by the tree(s) the blob belongs to.
    Blobs themselves have no identifier aside from the hash of its contents.^

Code repositories for project(s) associated with this public inbox

	https://git.savannah.gnu.org/cgit/emacs.git

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).