summaryrefslogtreecommitdiffstats
path: root/library/menu.tcl
blob: 381da68bfb8d683a93a6299d81769073473b8f58 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
# menu.tcl --
#
# This file defines the default bindings for Tk menus and menubuttons.
# It also implements keyboard traversal of menus and implements a few
# other utility procedures related to menus.
#
# RCS: @(#) $Id: menu.tcl,v 1.29 2008/08/27 18:49:46 tmh Exp $
#
# Copyright (c) 1992-1994 The Regents of the University of California.
# Copyright (c) 1994-1997 Sun Microsystems, Inc.
# Copyright (c) 1998-1999 by Scriptics Corporation.
# Copyright (c) 2007 Daniel A. Steffen <das@users.sourceforge.net>
#
# See the file "license.terms" for information on usage and redistribution
# of this file, and for a DISCLAIMER OF ALL WARRANTIES.
#

#-------------------------------------------------------------------------
# Elements of tk::Priv that are used in this file:
#
# cursor -		Saves the -cursor option for the posted menubutton.
# focus -		Saves the focus during a menu selection operation.
#			Focus gets restored here when the menu is unposted.
# grabGlobal -		Used in conjunction with tk::Priv(oldGrab):  if
#			tk::Priv(oldGrab) is non-empty, then tk::Priv(grabGlobal)
#			contains either an empty string or "-global" to
#			indicate whether the old grab was a local one or
#			a global one.
# inMenubutton -	The name of the menubutton widget containing
#			the mouse, or an empty string if the mouse is
#			not over any menubutton.
# menuBar -		The name of the menubar that is the root
#			of the cascade hierarchy which is currently
#			posted. This is null when there is no menu currently
#			being pulled down from a menu bar.
# oldGrab -		Window that had the grab before a menu was posted.
#			Used to restore the grab state after the menu
#			is unposted.  Empty string means there was no
#			grab previously set.
# popup -		If a menu has been popped up via tk_popup, this
#			gives the name of the menu.  Otherwise this
#			value is empty.
# postedMb -		Name of the menubutton whose menu is currently
#			posted, or an empty string if nothing is posted
#			A grab is set on this widget.
# relief -		Used to save the original relief of the current
#			menubutton.
# window -		When the mouse is over a menu, this holds the
#			name of the menu;  it's cleared when the mouse
#			leaves the menu.
# tearoff -		Whether the last menu posted was a tearoff or not.
#			This is true always for unix, for tearoffs for Mac
#			and Windows.
# activeMenu -		This is the last active menu for use
#			with the <<MenuSelect>> virtual event.
# activeItem -		This is the last active menu item for
#			use with the <<MenuSelect>> virtual event.
#-------------------------------------------------------------------------

#-------------------------------------------------------------------------
# Overall note:
# This file is tricky because there are five different ways that menus
# can be used:
#
# 1. As a pulldown from a menubutton. In this style, the variable 
#    tk::Priv(postedMb) identifies the posted menubutton.
# 2. As a torn-off menu copied from some other menu.  In this style
#    tk::Priv(postedMb) is empty, and menu's type is "tearoff".
# 3. As an option menu, triggered from an option menubutton.  In this
#    style tk::Priv(postedMb) identifies the posted menubutton.
# 4. As a popup menu.  In this style tk::Priv(postedMb) is empty and
#    the top-level menu's type is "normal".
# 5. As a pulldown from a menubar. The variable tk::Priv(menubar) has
#    the owning menubar, and the menu itself is of type "normal".
#
# The various binding procedures use the  state described above to
# distinguish the various cases and take different actions in each
# case.
#-------------------------------------------------------------------------

#-------------------------------------------------------------------------
# The code below creates the default class bindings for menus
# and menubuttons.
#-------------------------------------------------------------------------

bind Menubutton <FocusIn> {}
bind Menubutton <Enter> {
    tk::MbEnter %W
}
bind Menubutton <Leave> {
    tk::MbLeave %W
}
bind Menubutton <1> {
    if {$tk::Priv(inMenubutton) ne ""} {
	tk::MbPost $tk::Priv(inMenubutton) %X %Y
    }
}
bind Menubutton <Motion> {
    tk::MbMotion %W up %X %Y
}
bind Menubutton <B1-Motion> {
    tk::MbMotion %W down %X %Y
}
bind Menubutton <ButtonRelease-1> {
    tk::MbButtonUp %W
}
bind Menubutton <space> {
    tk::MbPost %W
    tk::MenuFirstEntry [%W cget -menu]
}

# Must set focus when mouse enters a menu, in order to allow
# mixed-mode processing using both the mouse and the keyboard.
# Don't set the focus if the event comes from a grab release,
# though:  such an event can happen after as part of unposting
# a cascaded chain of menus, after the focus has already been
# restored to wherever it was before menu selection started.

bind Menu <FocusIn> {}

bind Menu <Enter> {
    set tk::Priv(window) %W
    if {[%W cget -type] eq "tearoff"} {
	if {"%m" ne "NotifyUngrab"} {
	    if {[tk windowingsystem] eq "x11"} {
		tk_menuSetFocus %W
	    }
	}
    }
    tk::MenuMotion %W %x %y %s
}

bind Menu <Leave> {
    tk::MenuLeave %W %X %Y %s
}
bind Menu <Motion> {
    tk::MenuMotion %W %x %y %s
}
bind Menu <ButtonPress> {
    tk::MenuButtonDown %W
}
bind Menu <ButtonRelease> {
   tk::MenuInvoke %W 1
}
bind Menu <space> {
    tk::MenuInvoke %W 0
}
bind Menu <Return> {
    tk::MenuInvoke %W 0
}
bind Menu <Escape> {
    tk::MenuEscape %W
}
bind Menu <Left> {
    tk::MenuLeftArrow %W
}
bind Menu <Right> {
    tk::MenuRightArrow %W
}
bind Menu <Up> {
    tk::MenuUpArrow %W
}
bind Menu <Down> {
    tk::MenuDownArrow %W
}
bind Menu <KeyPress> {
    tk::TraverseWithinMenu %W %A
}

# The following bindings apply to all windows, and are used to
# implement keyboard menu traversal.

if {[tk windowingsystem] eq "x11"} {
    bind all <Alt-KeyPress> {
	tk::TraverseToMenu %W %A
    }

    bind all <F10> {
	tk::FirstMenu %W
    }
} else {
    bind Menubutton <Alt-KeyPress> {
	tk::TraverseToMenu %W %A
    }

    bind Menubutton <F10> {
	tk::FirstMenu %W
    }
}

# ::tk::MbEnter --
# This procedure is invoked when the mouse enters a menubutton
# widget.  It activates the widget unless it is disabled.  Note:
# this procedure is only invoked when mouse button 1 is *not* down.
# The procedure ::tk::MbB1Enter is invoked if the button is down.
#
# Arguments:
# w -			The  name of the widget.

proc ::tk::MbEnter w {
    variable ::tk::Priv

    if {$Priv(inMenubutton) ne ""} {
	MbLeave $Priv(inMenubutton)
    }
    set Priv(inMenubutton) $w
    if {[$w cget -state] ne "disabled" && [tk windowingsystem] ne "aqua"} {
	$w configure -state active
    }
}

# ::tk::MbLeave --
# This procedure is invoked when the mouse leaves a menubutton widget.
# It de-activates the widget, if the widget still exists.
#
# Arguments:
# w -			The  name of the widget.

proc ::tk::MbLeave w {
    variable ::tk::Priv

    set Priv(inMenubutton) {}
    if {![winfo exists $w]} {
	return
    }
    if {[$w cget -state] eq "active" && [tk windowingsystem] ne "aqua"} {
	$w configure -state normal
    }
}

# ::tk::MbPost --
# Given a menubutton, this procedure does all the work of posting
# its associated menu and unposting any other menu that is currently
# posted.
#
# Arguments:
# w -			The name of the menubutton widget whose menu
#			is to be posted.
# x, y -		Root coordinates of cursor, used for positioning
#			option menus.  If not specified, then the center
#			of the menubutton is used for an option menu.

proc ::tk::MbPost {w {x {}} {y {}}} {
    global errorInfo
    variable ::tk::Priv
    global tcl_platform

    if {[$w cget -state] eq "disabled" || $w eq $Priv(postedMb)} {
	return
    }
    set menu [$w cget -menu]
    if {$menu eq ""} {
	return
    }
    set tearoff [expr {[tk windowingsystem] eq "x11" \
	    || [$menu cget -type] eq "tearoff"}]
    if {[string first $w $menu] != 0} {
	error "can't post $menu:  it isn't a descendant of $w (this is a new requirement in Tk versions 3.0 and later)"
    }
    set cur $Priv(postedMb)
    if {$cur ne ""} {
	MenuUnpost {}
    }
    if {$::tk_strictMotif} {
        set Priv(cursor) [$w cget -cursor]
        $w configure -cursor arrow
    }
    if {[tk windowingsystem] ne "aqua"} {
	set Priv(relief) [$w cget -relief]
	$w configure -relief raised
    } else {
	$w configure -state active
    }

    set Priv(postedMb) $w
    set Priv(focus) [focus]
    $menu activate none
    GenerateMenuSelect $menu

    # If this looks like an option menubutton then post the menu so
    # that the current entry is on top of the mouse.  Otherwise post
    # the menu just below the menubutton, as for a pull-down.

    update idletasks
    if {[catch {
	switch [$w cget -direction] {
    	    above {
    	    	set x [winfo rootx $w]
    	    	set y [expr {[winfo rooty $w] - [winfo reqheight $menu]}]
		# if we go offscreen to the top, show as 'below'
		if {$y < 0} {
		    set y [expr {[winfo rooty $w] + [winfo height $w]}]
		}
		PostOverPoint $menu $x $y
    	    }
    	    below {
    	    	set x [winfo rootx $w]
    	    	set y [expr {[winfo rooty $w] + [winfo height $w]}]
		# if we go offscreen to the bottom, show as 'above'
		set mh [winfo reqheight $menu]
		if {($y + $mh) > [winfo screenheight $w]} {
		    set y [expr {[winfo rooty $w] - $mh}]
		}
		PostOverPoint $menu $x $y
    	    }
    	    left {
    	    	set x [expr {[winfo rootx $w] - [winfo reqwidth $menu]}]
    	    	set y [expr {(2 * [winfo rooty $w] + [winfo height $w]) / 2}]
    	    	set entry [MenuFindName $menu [$w cget -text]]
    	    	if {[$w cget -indicatoron]} {
		    if {$entry == [$menu index last]} {
		    	incr y [expr {-([$menu yposition $entry] \
			    	+ [winfo reqheight $menu])/2}]
		    } else {
		    	incr y [expr {-([$menu yposition $entry] \
			        + [$menu yposition [expr {$entry+1}]])/2}]
		    }
    	    	}
		PostOverPoint $menu $x $y
		if {$entry ne "" \
			&& [$menu entrycget $entry -state] ne "disabled"} {
    	    	    $menu activate $entry
		    GenerateMenuSelect $menu
    	    	}
    	    }
    	    right {
    	    	set x [expr {[winfo rootx $w] + [winfo width $w]}]
    	    	set y [expr {(2 * [winfo rooty $w] + [winfo height $w]) / 2}]
    	    	set entry [MenuFindName $menu [$w cget -text]]
    	    	if {[$w cget -indicatoron]} {
		    if {$entry == [$menu index last]} {
		    	incr y [expr {-([$menu yposition $entry] \
			    	+ [winfo reqheight $menu])/2}]
		    } else {
		    	incr y [expr {-([$menu yposition $entry] \
			        + [$menu yposition [expr {$entry+1}]])/2}]
		    }
    	    	}
		PostOverPoint $menu $x $y
		if {$entry ne "" \
			&& [$menu entrycget $entry -state] ne "disabled"} {
    	    	    $menu activate $entry
		    GenerateMenuSelect $menu
    	    	}
    	    }
    	    default {
    	    	if {[$w cget -indicatoron]} {
		    if {$y eq ""} {
			set x [expr {[winfo rootx $w] + [winfo width $w]/2}]
			set y [expr {[winfo rooty $w] + [winfo height $w]/2}]
	    	    }
	            PostOverPoint $menu $x $y [MenuFindName $menu [$w cget -text]]
		} else {
		    PostOverPoint $menu [winfo rootx $w] [expr {[winfo rooty $w]+[winfo height $w]}]
    	    	}
    	    }
	}
    } msg]} {
	# Error posting menu (e.g. bogus -postcommand). Unpost it and
	# reflect the error.
	
	set savedInfo $errorInfo
	MenuUnpost {}
	error $msg $savedInfo

    }

    set Priv(tearoff) $tearoff
    if {$tearoff != 0} {
    	focus $menu
	if {[winfo viewable $w]} {
	    SaveGrabInfo $w
	    grab -global $w
	}
    }
}

# ::tk::MenuUnpost --
# This procedure unposts a given menu, plus all of its ancestors up
# to (and including) a menubutton, if any.  It also restores various
# values to what they were before the menu was posted, and releases
# a grab if there's a menubutton involved.  Special notes:
# 1. It's important to unpost all menus before releasing the grab, so
#    that any Enter-Leave events (e.g. from menu back to main
#    application) have mode NotifyGrab.
# 2. Be sure to enclose various groups of commands in "catch" so that
#    the procedure will complete even if the menubutton or the menu
#    or the grab window has been deleted.
#
# Arguments:
# menu -		Name of a menu to unpost.  Ignored if there
#			is a posted menubutton.

proc ::tk::MenuUnpost menu {
    global tcl_platform
    variable ::tk::Priv
    set mb $Priv(postedMb)

    # Restore focus right away (otherwise X will take focus away when
    # the menu is unmapped and under some window managers (e.g. olvwm)
    # we'll lose the focus completely).

    catch {focus $Priv(focus)}
    set Priv(focus) ""

    # Unpost menu(s) and restore some stuff that's dependent on
    # what was posted.

    catch {
	if {$mb ne ""} {
	    set menu [$mb cget -menu]
	    $menu unpost
	    set Priv(postedMb) {}
	    if {$::tk_strictMotif} {
	        $mb configure -cursor $Priv(cursor)
	    }
	    if {[tk windowingsystem] ne "aqua"} {
		$mb configure -relief $Priv(relief)
	    } else {
		$mb configure -state normal
	    }
	} elseif {$Priv(popup) ne ""} {
	    $Priv(popup) unpost
	    set Priv(popup) {}
	} elseif {[$menu cget -type] ne "menubar" \
		&& [$menu cget -type] ne "tearoff"} {
	    # We're in a cascaded sub-menu from a torn-off menu or popup.
	    # Unpost all the menus up to the toplevel one (but not
	    # including the top-level torn-off one) and deactivate the
	    # top-level torn off menu if there is one.

	    while {1} {
		set parent [winfo parent $menu]
		if {[winfo class $parent] ne "Menu" \
			|| ![winfo ismapped $parent]} {
		    break
		}
		$parent activate none
		$parent postcascade none
		GenerateMenuSelect $parent
		set type [$parent cget -type]
		if {$type eq "menubar" || $type eq "tearoff"} {
		    break
		}
		set menu $parent
	    }
	    if {[$menu cget -type] ne "menubar"} {
		$menu unpost
	    }
	}
    }

    if {($Priv(tearoff) != 0) || $Priv(menuBar) ne ""} {
    	# Release grab, if any, and restore the previous grab, if there
    	# was one.
	if {$menu ne ""} {
	    set grab [grab current $menu]
	    if {$grab ne ""} {
		grab release $grab
	    }
	}
	RestoreOldGrab
	if {$Priv(menuBar) ne ""} {
	    if {$::tk_strictMotif} {
		$Priv(menuBar) configure -cursor $Priv(cursor)
	    }
	    set Priv(menuBar) {}
	}
	if {[tk windowingsystem] ne "x11"} {
	    set Priv(tearoff) 0
	}
    }
}

# ::tk::MbMotion --
# This procedure handles mouse motion events inside menubuttons, and
# also outside menubuttons when a menubutton has a grab (e.g. when a
# menu selection operation is in progress).
#
# Arguments:
# w -			The name of the menubutton widget.
# upDown - 		"down" means button 1 is pressed, "up" means
#			it isn't.
# rootx, rooty -	Coordinates of mouse, in (virtual?) root window.

proc ::tk::MbMotion {w upDown rootx rooty} {
    variable ::tk::Priv

    if {$Priv(inMenubutton) eq $w} {
	return
    }
    set new [winfo containing $rootx $rooty]
    if {$new ne $Priv(inMenubutton) \
	    && ($new eq "" || [winfo toplevel $new] eq [winfo toplevel $w])} {
	if {$Priv(inMenubutton) ne ""} {
	    MbLeave $Priv(inMenubutton)
	}
	if {$new ne "" \
		&& [winfo class $new] eq "Menubutton" \
		&& ([$new cget -indicatoron] == 0) \
		&& ([$w cget -indicatoron] == 0)} {
	    if {$upDown eq "down"} {
		MbPost $new $rootx $rooty
	    } else {
		MbEnter $new
	    }
	}
    }
}

# ::tk::MbButtonUp --
# This procedure is invoked to handle button 1 releases for menubuttons.
# If the release happens inside the menubutton then leave its menu
# posted with element 0 activated.  Otherwise, unpost the menu.
#
# Arguments:
# w -			The name of the menubutton widget.

proc ::tk::MbButtonUp w {
    variable ::tk::Priv
    global tcl_platform

    set menu [$w cget -menu]
    set tearoff [expr {[tk windowingsystem] eq "x11" || \
	    ($menu ne "" && [$menu cget -type] eq "tearoff")}]
    if {($tearoff != 0) && $Priv(postedMb) eq $w \
	    && $Priv(inMenubutton) eq $w} {
	MenuFirstEntry [$Priv(postedMb) cget -menu]
    } else {
	MenuUnpost {}
    }
}

# ::tk::MenuMotion --
# This procedure is called to handle mouse motion events for menus.
# It does two things.  First, it resets the active element in the
# menu, if the mouse is over the menu.  Second, if a mouse button
# is down, it posts and unposts cascade entries to match the mouse
# position.
#
# Arguments:
# menu -		The menu window.
# x -			The x position of the mouse.
# y -			The y position of the mouse.
# state -		Modifier state (tells whether buttons are down).

proc ::tk::MenuMotion {menu x y state} {
    variable ::tk::Priv
    if {$menu eq $Priv(window)} {
	if {[$menu cget -type] eq "menubar"} {
	    if {[info exists Priv(focus)] && $menu ne $Priv(focus)} {
		$menu activate @$x,$y
		GenerateMenuSelect $menu
	    }
	} else {
	    $menu activate @$x,$y
	    GenerateMenuSelect $menu
	}
    }
    if {($state & 0x1f00) != 0} {
	$menu postcascade active
    }
}

# ::tk::MenuButtonDown --
# Handles button presses in menus.  There are a couple of tricky things
# here:
# 1. Change the posted cascade entry (if any) to match the mouse position.
# 2. If there is a posted menubutton, must grab to the menubutton;  this
#    overrrides the implicit grab on button press, so that the menu
#    button can track mouse motions over other menubuttons and change
#    the posted menu.
# 3. If there's no posted menubutton (e.g. because we're a torn-off menu
#    or one of its descendants) must grab to the top-level menu so that
#    we can track mouse motions across the entire menu hierarchy.
#
# Arguments:
# menu -		The menu window.

proc ::tk::MenuButtonDown menu {
    variable ::tk::Priv
    global tcl_platform

    if {![winfo viewable $menu]} {
        return
    }
    $menu postcascade active
    if {$Priv(postedMb) ne "" && [winfo viewable $Priv(postedMb)]} {
	grab -global $Priv(postedMb)
    } else {
	while {[$menu cget -type] eq "normal" \
		&& [winfo class [winfo parent $menu]] eq "Menu" \
		&& [winfo ismapped [winfo parent $menu]]} {
	    set menu [winfo parent $menu]
	}

	if {$Priv(menuBar) eq {}} {
	    set Priv(menuBar) $menu
	    if {$::tk_strictMotif} {
		set Priv(cursor) [$menu cget -cursor]
		$menu configure -cursor arrow
	    }
        }

	# Don't update grab information if the grab window isn't changing.
	# Otherwise, we'll get an error when we unpost the menus and
	# restore the grab, since the old grab window will not be viewable
	# anymore.

	if {$menu ne [grab current $menu]} {
	    SaveGrabInfo $menu
	}

	# Must re-grab even if the grab window hasn't changed, in order
	# to release the implicit grab from the button press.

	if {[tk windowingsystem] eq "x11"} {
	    grab -global $menu
	}
    }
}

# ::tk::MenuLeave --
# This procedure is invoked to handle Leave events for a menu.  It
# deactivates everything unless the active element is a cascade element
# and the mouse is now over the submenu.
#
# Arguments:
# menu -		The menu window.
# rootx, rooty -	Root coordinates of mouse.
# state -		Modifier state.

proc ::tk::MenuLeave {menu rootx rooty state} {
    variable ::tk::Priv
    set Priv(window) {}
    if {[$menu index active] eq "none"} {
	return
    }
    if {[$menu type active] eq "cascade" \
	    && [winfo containing $rootx $rooty] eq \
		[$menu entrycget active -menu]} {
	return
    }
    $menu activate none
    GenerateMenuSelect $menu
}

# ::tk::MenuInvoke --
# This procedure is invoked when button 1 is released over a menu.
# It invokes the appropriate menu action and unposts the menu if
# it came from a menubutton.
#
# Arguments:
# w -			Name of the menu widget.
# buttonRelease -	1 means this procedure is called because of
#			a button release;  0 means because of keystroke.

proc ::tk::MenuInvoke {w buttonRelease} {
    variable ::tk::Priv

    if {$buttonRelease && $Priv(window) eq ""} {
	# Mouse was pressed over a menu without a menu button, then
	# dragged off the menu (possibly with a cascade posted) and
	# released.  Unpost everything and quit.

	$w postcascade none
	$w activate none
	event generate $w <<MenuSelect>>
	MenuUnpost $w
	return
    }
    if {[$w type active] eq "cascade"} {
	$w postcascade active
	set menu [$w entrycget active -menu]
	MenuFirstEntry $menu
    } elseif {[$w type active] eq "tearoff"} {
	::tk::TearOffMenu $w
	MenuUnpost $w
    } elseif {[$w cget -type] eq "menubar"} {
	$w postcascade none
	set active [$w index active]
	set isCascade [string equal [$w type $active] "cascade"]

	# Only de-activate the active item if it's a cascade; this prevents
	# the annoying "activation flicker" you otherwise get with 
	# checkbuttons/commands/etc. on menubars

	if { $isCascade } {
	    $w activate none
	    event generate $w <<MenuSelect>>
	}

	MenuUnpost $w

	# If the active item is not a cascade, invoke it.  This enables
	# the use of checkbuttons/commands/etc. on menubars (which is legal,
	# but not recommended)

	if { !$isCascade } {
	    uplevel #0 [list $w invoke $active]
	}
    } else {
	set active [$w index active]
	if {$Priv(popup) eq "" || $active ne "none"} {
	    MenuUnpost $w
	}
	uplevel #0 [list $w invoke active]
    }
}

# ::tk::MenuEscape --
# This procedure is invoked for the Cancel (or Escape) key.  It unposts
# the given menu and, if it is the top-level menu for a menu button,
# unposts the menu button as well.
#
# Arguments:
# menu -		Name of the menu window.

proc ::tk::MenuEscape menu {
    set parent [winfo parent $menu]
    if {[winfo class $parent] ne "Menu"} {
	MenuUnpost $menu
    } elseif {[$parent cget -type] eq "menubar"} {
	MenuUnpost $menu
	RestoreOldGrab
    } else {
	MenuNextMenu $menu left
    }
}

# The following routines handle arrow keys. Arrow keys behave
# differently depending on whether the menu is a menu bar or not.

proc ::tk::MenuUpArrow {menu} {
    if {[$menu cget -type] eq "menubar"} {
	MenuNextMenu $menu left
    } else {
	MenuNextEntry $menu -1
    }
}

proc ::tk::MenuDownArrow {menu} {
    if {[$menu cget -type] eq "menubar"} {
	MenuNextMenu $menu right
    } else {
	MenuNextEntry $menu 1
    }
}

proc ::tk::MenuLeftArrow {menu} {
    if {[$menu cget -type] eq "menubar"} {
	MenuNextEntry $menu -1
    } else {
	MenuNextMenu $menu left
    }
}

proc ::tk::MenuRightArrow {menu} {
    if {[$menu cget -type] eq "menubar"} {
	MenuNextEntry $menu 1
    } else {
	MenuNextMenu $menu right
    }
}

# ::tk::MenuNextMenu --
# This procedure is invoked to handle "left" and "right" traversal
# motions in menus.  It traverses to the next menu in a menu bar,
# or into or out of a cascaded menu.
#
# Arguments:
# menu -		The menu that received the keyboard
#			event.
# direction -		Direction in which to move: "left" or "right"

proc ::tk::MenuNextMenu {menu direction} {
    variable ::tk::Priv

    # First handle traversals into and out of cascaded menus.

    if {$direction eq "right"} {
	set count 1
	set parent [winfo parent $menu]
	set class [winfo class $parent]
	if {[$menu type active] eq "cascade"} {
	    $menu postcascade active
	    set m2 [$menu entrycget active -menu]
	    if {$m2 ne ""} {
		MenuFirstEntry $m2
	    }
	    return
	} else {
	    set parent [winfo parent $menu]
	    while {$parent ne "."} {
		if {[winfo class $parent] eq "Menu" \
			&& [$parent cget -type] eq "menubar"} {
		    tk_menuSetFocus $parent
		    MenuNextEntry $parent 1
		    return
		}
		set parent [winfo parent $parent]
	    }
	}
    } else {
	set count -1
	set m2 [winfo parent $menu]
	if {[winfo class $m2] eq "Menu"} {
	    $menu activate none
	    GenerateMenuSelect $menu
	    tk_menuSetFocus $m2

	    $m2 postcascade none

	    if {[$m2 cget -type] ne "menubar"} {
		return
	    }
	}
    }

    # Can't traverse into or out of a cascaded menu. Go to the next
    # or previous menubutton, if that makes sense.

    set m2 [winfo parent $menu]
    if {[winfo class $m2] eq "Menu" && [$m2 cget -type] eq "menubar"} {
	tk_menuSetFocus $m2
	MenuNextEntry $m2 -1
	return
    }

    set w $Priv(postedMb)
    if {$w eq ""} {
	return
    }
    set buttons [winfo children [winfo parent $w]]
    set length [llength $buttons]
    set i [expr {[lsearch -exact $buttons $w] + $count}]
    while {1} {
	while {$i < 0} {
	    incr i $length
	}
	while {$i >= $length} {
	    incr i -$length
	}
	set mb [lindex $buttons $i]
	if {[winfo class $mb] eq "Menubutton" \
		&& [$mb cget -state] ne "disabled" \
		&& [$mb cget -menu] ne "" \
		&& [[$mb cget -menu] index last] ne "none"} {
	    break
	}
	if {$mb eq $w} {
	    return
	}
	incr i $count
    }
    MbPost $mb
    MenuFirstEntry [$mb cget -menu]
}

# ::tk::MenuNextEntry --
# Activate the next higher or lower entry in the posted menu,
# wrapping around at the ends.  Disabled entries are skipped.
#
# Arguments:
# menu -			Menu window that received the keystroke.
# count -			1 means go to the next lower entry,
#				-1 means go to the next higher entry.

proc ::tk::MenuNextEntry {menu count} {
    if {[$menu index last] eq "none"} {
	return
    }
    set length [expr {[$menu index last]+1}]
    set quitAfter $length
    set active [$menu index active]
    if {$active eq "none"} {
	set i 0
    } else {
	set i [expr {$active + $count}]
    }
    while {1} {
	if {$quitAfter <= 0} {
	    # We've tried every entry in the menu.  Either there are
	    # none, or they're all disabled.  Just give up.

	    return
	}
	while {$i < 0} {
	    incr i $length
	}
	while {$i >= $length} {
	    incr i -$length
	}
	if {[catch {$menu entrycget $i -state} state] == 0} {
	    if {$state ne "disabled" && \
		    ($i!=0 || [$menu cget -type] ne "tearoff" \
		    || [$menu type 0] ne "tearoff")} {
		break
	    }
	}
	if {$i == $active} {
	    return
	}
	incr i $count
	incr quitAfter -1
    }
    $menu activate $i
    GenerateMenuSelect $menu

    if {[$menu type $i] eq "cascade" && [$menu cget -type] eq "menubar"} {
	set cascade [$menu entrycget $i -menu]
	if {$cascade ne ""} {
	    # Here we auto-post a cascade.  This is necessary when
	    # we traverse left/right in the menubar, but undesirable when
	    # we traverse up/down in a menu.
	    $menu postcascade $i
	    MenuFirstEntry $cascade
	}
    }
}

# ::tk::MenuFind --
# This procedure searches the entire window hierarchy under w for
# a menubutton that isn't disabled and whose underlined character
# is "char" or an entry in a menubar that isn't disabled and whose
# underlined character is "char".
# It returns the name of that window, if found, or an
# empty string if no matching window was found.  If "char" is an
# empty string then the procedure returns the name of the first
# menubutton found that isn't disabled.
#
# Arguments:
# w -				Name of window where key was typed.
# char -			Underlined character to search for;
#				may be either upper or lower case, and
#				will match either upper or lower case.

proc ::tk::MenuFind {w char} {
    set char [string tolower $char]
    set windowlist [winfo child $w]

    foreach child $windowlist {
	# Don't descend into other toplevels.
        if {[winfo toplevel $w] ne [winfo toplevel $child]} {
	    continue
	}
	if {[winfo class $child] eq "Menu" && \
		[$child cget -type] eq "menubar"} {
	    if {$char eq ""} {
		return $child
	    }
	    set last [$child index last]
	    for {set i [$child cget -tearoff]} {$i <= $last} {incr i} {
		if {[$child type $i] eq "separator"} {
		    continue
		}
		set char2 [string index [$child entrycget $i -label] \
			[$child entrycget $i -underline]]
		if {$char eq [string tolower $char2] || $char eq ""} {
		    if {[$child entrycget $i -state] ne "disabled"} {
			return $child
		    }
		}
	    }
	}
    }

    foreach child $windowlist {
	# Don't descend into other toplevels.
        if {[winfo toplevel $w] ne [winfo toplevel $child]} {
	    continue
	}
	switch -- [winfo class $child] {
	    Menubutton {
		set char2 [string index [$child cget -text] \
			[$child cget -underline]]
		if {$char eq [string tolower $char2] || $char eq ""} {
		    if {[$child cget -state] ne "disabled"} {
			return $child
		    }
		}
	    }

	    default {
		set match [MenuFind $child $char]
		if {$match ne ""} {
		    return $match
		}
	    }
	}
    }
    return {}
}

# ::tk::TraverseToMenu --
# This procedure implements keyboard traversal of menus.  Given an
# ASCII character "char", it looks for a menubutton with that character
# underlined.  If one is found, it posts the menubutton's menu
#
# Arguments:
# w -				Window in which the key was typed (selects
#				a toplevel window).
# char -			Character that selects a menu.  The case
#				is ignored.  If an empty string, nothing
#				happens.

proc ::tk::TraverseToMenu {w char} {
    variable ::tk::Priv
    if {$char eq ""} {
	return
    }
    while {[winfo class $w] eq "Menu"} {
	if {[$w cget -type] ne "menubar" && $Priv(postedMb) eq ""} {
	    return
	}
	if {[$w cget -type] eq "menubar"} {
	    break
	}
	set w [winfo parent $w]
    }
    set w [MenuFind [winfo toplevel $w] $char]
    if {$w ne ""} {
	if {[winfo class $w] eq "Menu"} {
	    tk_menuSetFocus $w
	    set Priv(window) $w
	    SaveGrabInfo $w
	    grab -global $w
	    TraverseWithinMenu $w $char
	} else {
	    MbPost $w
	    MenuFirstEntry [$w cget -menu]
	}
    }
}

# ::tk::FirstMenu --
# This procedure traverses to the first menubutton in the toplevel
# for a given window, and posts that menubutton's menu.
#
# Arguments:
# w -				Name of a window.  Selects which toplevel
#				to search for menubuttons.

proc ::tk::FirstMenu w {
    variable ::tk::Priv
    set w [MenuFind [winfo toplevel $w] ""]
    if {$w ne ""} {
	if {[winfo class $w] eq "Menu"} {
	    tk_menuSetFocus $w
	    set Priv(window) $w
	    SaveGrabInfo $w
	    grab -global $w
	    MenuFirstEntry $w
	} else {
	    MbPost $w
	    MenuFirstEntry [$w cget -menu]
	}
    }
}

# ::tk::TraverseWithinMenu
# This procedure implements keyboard traversal within a menu.  It
# searches for an entry in the menu that has "char" underlined.  If
# such an entry is found, it is invoked and the menu is unposted.
#
# Arguments:
# w -				The name of the menu widget.
# char -			The character to look for;  case is
#				ignored.  If the string is empty then
#				nothing happens.

proc ::tk::TraverseWithinMenu {w char} {
    if {$char eq ""} {
	return
    }
    set char [string tolower $char]
    set last [$w index last]
    if {$last eq "none"} {
	return
    }
    for {set i 0} {$i <= $last} {incr i} {
	if {[catch {set char2 [string index \
		[$w entrycget $i -label] [$w entrycget $i -underline]]}]} {
	    continue
	}
	if {$char eq [string tolower $char2]} {
	    if {[$w type $i] eq "cascade"} {
		$w activate $i
		$w postcascade active
		event generate $w <<MenuSelect>>
		set m2 [$w entrycget $i -menu]
		if {$m2 ne ""} {
		    MenuFirstEntry $m2
		}
	    } else {
		MenuUnpost $w
		uplevel #0 [list $w invoke $i]
	    }
	    return
	}
    }
}

# ::tk::MenuFirstEntry --
# Given a menu, this procedure finds the first entry that isn't
# disabled or a tear-off or separator, and activates that entry.
# However, if there is already an active entry in the menu (e.g.,
# because of a previous call to tk::PostOverPoint) then the active
# entry isn't changed.  This procedure also sets the input focus
# to the menu.
#
# Arguments:
# menu -		Name of the menu window (possibly empty).

proc ::tk::MenuFirstEntry menu {
    if {$menu eq ""} {
	return
    }
    tk_menuSetFocus $menu
    if {[$menu index active] ne "none"} {
	return
    }
    set last [$menu index last]
    if {$last eq "none"} {
	return
    }
    for {set i 0} {$i <= $last} {incr i} {
	if {([catch {set state [$menu entrycget $i -state]}] == 0) \
		&& $state ne "disabled" && [$menu type $i] ne "tearoff"} {
	    $menu activate $i
	    GenerateMenuSelect $menu
	    # Only post the cascade if the current menu is a menubar;
	    # otherwise, if the first entry of the cascade is a cascade,
	    # we can get an annoying cascading effect resulting in a bunch of
	    # menus getting posted (bug 676)
	    if {[$menu type $i] eq "cascade" \
		    && [$menu cget -type] eq "menubar"} {
		set cascade [$menu entrycget $i -menu]
		if {$cascade ne ""} {
		    $menu postcascade $i
		    MenuFirstEntry $cascade
		}
	    }
	    return
	}
    }
}

# ::tk::MenuFindName --
# Given a menu and a text string, return the index of the menu entry
# that displays the string as its label.  If there is no such entry,
# return an empty string.  This procedure is tricky because some names
# like "active" have a special meaning in menu commands, so we can't
# always use the "index" widget command.
#
# Arguments:
# menu -		Name of the menu widget.
# s -			String to look for.

proc ::tk::MenuFindName {menu s} {
    set i ""
    if {![regexp {^active$|^last$|^none$|^[0-9]|^@} $s]} {
	catch {set i [$menu index $s]}
	return $i
    }
    set last [$menu index last]
    if {$last eq "none"} {
	return
    }
    for {set i 0} {$i <= $last} {incr i} {
	if {![catch {$menu entrycget $i -label} label]} {
	    if {$label eq $s} {
		return $i
	    }
	}
    }
    return ""
}

# ::tk::PostOverPoint --
# This procedure posts a given menu such that a given entry in the
# menu is centered over a given point in the root window.  It also
# activates the given entry.
#
# Arguments:
# menu -		Menu to post.
# x, y -		Root coordinates of point.
# entry -		Index of entry within menu to center over (x,y).
#			If omitted or specified as {}, then the menu's
#			upper-left corner goes at (x,y).

proc ::tk::PostOverPoint {menu x y {entry {}}}  {
    global tcl_platform
    
    if {$entry ne ""} {
	if {$entry == [$menu index last]} {
	    incr y [expr {-([$menu yposition $entry] \
		    + [winfo reqheight $menu])/2}]
	} else {
	    incr y [expr {-([$menu yposition $entry] \
		    + [$menu yposition [expr {$entry+1}]])/2}]
	}
	incr x [expr {-[winfo reqwidth $menu]/2}]
    }
    if {$tcl_platform(platform) == "windows"} {
	# We need to fix some problems with menu posting on Windows,
	# where, if the menu would overlap top or bottom of screen,
	# Windows puts it in the wrong place for us.  We must also
	# subtract an extra amount for half the height of the current
	# entry.  To be safe we subtract an extra 10.
	set yoffset [expr {[winfo screenheight $menu] \
		- $y - [winfo reqheight $menu] - 10}]
	if {$yoffset < 0} {
	    # The bottom of the menu is offscreen, so adjust upwards
	    incr y $yoffset
	    if {$y < 0} { set y 0 }
	}
	# If we're off the top of the screen (either because we were
	# originally or because we just adjusted too far upwards),
	# then make the menu popup on the top edge.
	if {$y < 0} {
	    set y 0
	}
    }
    $menu post $x $y
    if {$entry ne "" && [$menu entrycget $entry -state] ne "disabled"} {
	$menu activate $entry
	GenerateMenuSelect $menu
    }
}

# ::tk::SaveGrabInfo --
# Sets the variables tk::Priv(oldGrab) and tk::Priv(grabStatus) to record
# the state of any existing grab on the w's display.
#
# Arguments:
# w -			Name of a window;  used to select the display
#			whose grab information is to be recorded.

proc tk::SaveGrabInfo w {
    variable ::tk::Priv
    set Priv(oldGrab) [grab current $w]
    if {$Priv(oldGrab) ne ""} {
	set Priv(grabStatus) [grab status $Priv(oldGrab)]
    }
}

# ::tk::RestoreOldGrab --
# Restores the grab to what it was before TkSaveGrabInfo was called.
#

proc ::tk::RestoreOldGrab {} {
    variable ::tk::Priv

    if {$Priv(oldGrab) ne ""} {
    	# Be careful restoring the old grab, since it's window may not
	# be visible anymore.

	catch {
	    if {$Priv(grabStatus) eq "global"} {
		grab set -global $Priv(oldGrab)
	    } else {
		grab set $Priv(oldGrab)
	    }
	}
	set Priv(oldGrab) ""
    }
}

proc ::tk_menuSetFocus {menu} {
    variable ::tk::Priv
    if {![info exists Priv(focus)] || $Priv(focus) eq ""} {
	set Priv(focus) [focus]
    }
    focus $menu
}
    
proc ::tk::GenerateMenuSelect {menu} {
    variable ::tk::Priv

    if {$Priv(activeMenu) eq $menu \
	    && $Priv(activeItem) eq [$menu index active]} {
	return
    }

    set Priv(activeMenu) $menu
    set Priv(activeItem) [$menu index active]
    event generate $menu <<MenuSelect>>
}

# ::tk_popup --
# This procedure pops up a menu and sets things up for traversing
# the menu and its submenus.
#
# Arguments:
# menu -		Name of the menu to be popped up.
# x, y -		Root coordinates at which to pop up the
#			menu.
# entry -		Index of a menu entry to center over (x,y).
#			If omitted or specified as {}, then menu's
#			upper-left corner goes at (x,y).

proc ::tk_popup {menu x y {entry {}}} {
    variable ::tk::Priv
    global tcl_platform
    if {$Priv(popup) ne "" || $Priv(postedMb) ne ""} {
	tk::MenuUnpost {}
    }
    tk::PostOverPoint $menu $x $y $entry
    if {[tk windowingsystem] eq "x11" && [winfo viewable $menu]} {
        tk::SaveGrabInfo $menu
	grab -global $menu
	set Priv(popup) $menu
	tk_menuSetFocus $menu
    }
}