summaryrefslogtreecommitdiffstats
path: root/library/text.tcl
blob: 3b2a5ab3fa9f05772cf32aa6ada90ffdfa1f8bfd (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
# text.tcl --
#
# This file defines the default bindings for Tk text widgets and provides
# procedures that help in implementing the bindings.
#
# RCS: @(#) $Id: text.tcl,v 1.24.2.6 2005/05/13 13:48:21 vincentdarley Exp $
#
# Copyright (c) 1992-1994 The Regents of the University of California.
# Copyright (c) 1994-1997 Sun Microsystems, Inc.
# Copyright (c) 1998 by Scriptics Corporation.
#
# 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:
#
# afterId -		If non-null, it means that auto-scanning is underway
#			and it gives the "after" id for the next auto-scan
#			command to be executed.
# char -		Character position on the line;  kept in order
#			to allow moving up or down past short lines while
#			still remembering the desired position.
# mouseMoved -		Non-zero means the mouse has moved a significant
#			amount since the button went down (so, for example,
#			start dragging out a selection).
# prevPos -		Used when moving up or down lines via the keyboard.
#			Keeps track of the previous insert position, so
#			we can distinguish a series of ups and downs, all
#			in a row, from a new up or down.
# selectMode -		The style of selection currently underway:
#			char, word, or line.
# x, y -		Last known mouse coordinates for scanning
#			and auto-scanning.
#-------------------------------------------------------------------------

#-------------------------------------------------------------------------
# The code below creates the default class bindings for text widgets.
#-------------------------------------------------------------------------

# Standard Motif bindings:

bind Text <1> {
    tk::TextButton1 %W %x %y
    %W tag remove sel 0.0 end
}
bind Text <B1-Motion> {
    set tk::Priv(x) %x
    set tk::Priv(y) %y
    tk::TextSelectTo %W %x %y
}
bind Text <Double-1> {
    set tk::Priv(selectMode) word
    tk::TextSelectTo %W %x %y
    catch {%W mark set insert sel.last}
}
bind Text <Triple-1> {
    set tk::Priv(selectMode) line
    tk::TextSelectTo %W %x %y
    catch {%W mark set insert sel.last}
}
bind Text <Shift-1> {
    tk::TextResetAnchor %W @%x,%y
    set tk::Priv(selectMode) char
    tk::TextSelectTo %W %x %y
}
bind Text <Double-Shift-1>	{
    set tk::Priv(selectMode) word
    tk::TextSelectTo %W %x %y 1
}
bind Text <Triple-Shift-1>	{
    set tk::Priv(selectMode) line
    tk::TextSelectTo %W %x %y
}
bind Text <B1-Leave> {
    set tk::Priv(x) %x
    set tk::Priv(y) %y
    tk::TextAutoScan %W
}
bind Text <B1-Enter> {
    tk::CancelRepeat
}
bind Text <ButtonRelease-1> {
    tk::CancelRepeat
}
bind Text <Control-1> {
    %W mark set insert @%x,%y
}
bind Text <Left> {
    tk::TextSetCursor %W insert-1c
}
bind Text <Right> {
    tk::TextSetCursor %W insert+1c
}
bind Text <Up> {
    tk::TextSetCursor %W [tk::TextUpDownLine %W -1]
}
bind Text <Down> {
    tk::TextSetCursor %W [tk::TextUpDownLine %W 1]
}
bind Text <Shift-Left> {
    tk::TextKeySelect %W [%W index {insert - 1c}]
}
bind Text <Shift-Right> {
    tk::TextKeySelect %W [%W index {insert + 1c}]
}
bind Text <Shift-Up> {
    tk::TextKeySelect %W [tk::TextUpDownLine %W -1]
}
bind Text <Shift-Down> {
    tk::TextKeySelect %W [tk::TextUpDownLine %W 1]
}
bind Text <Control-Left> {
    tk::TextSetCursor %W [tk::TextPrevPos %W insert tcl_startOfPreviousWord]
}
bind Text <Control-Right> {
    tk::TextSetCursor %W [tk::TextNextWord %W insert]
}
bind Text <Control-Up> {
    tk::TextSetCursor %W [tk::TextPrevPara %W insert]
}
bind Text <Control-Down> {
    tk::TextSetCursor %W [tk::TextNextPara %W insert]
}
bind Text <Shift-Control-Left> {
    tk::TextKeySelect %W [tk::TextPrevPos %W insert tcl_startOfPreviousWord]
}
bind Text <Shift-Control-Right> {
    tk::TextKeySelect %W [tk::TextNextWord %W insert]
}
bind Text <Shift-Control-Up> {
    tk::TextKeySelect %W [tk::TextPrevPara %W insert]
}
bind Text <Shift-Control-Down> {
    tk::TextKeySelect %W [tk::TextNextPara %W insert]
}
bind Text <Prior> {
    tk::TextSetCursor %W [tk::TextScrollPages %W -1]
}
bind Text <Shift-Prior> {
    tk::TextKeySelect %W [tk::TextScrollPages %W -1]
}
bind Text <Next> {
    tk::TextSetCursor %W [tk::TextScrollPages %W 1]
}
bind Text <Shift-Next> {
    tk::TextKeySelect %W [tk::TextScrollPages %W 1]
}
bind Text <Control-Prior> {
    %W xview scroll -1 page
}
bind Text <Control-Next> {
    %W xview scroll 1 page
}

bind Text <Home> {
    tk::TextSetCursor %W {insert linestart}
}
bind Text <Shift-Home> {
    tk::TextKeySelect %W {insert linestart}
}
bind Text <End> {
    tk::TextSetCursor %W {insert lineend}
}
bind Text <Shift-End> {
    tk::TextKeySelect %W {insert lineend}
}
bind Text <Control-Home> {
    tk::TextSetCursor %W 1.0
}
bind Text <Control-Shift-Home> {
    tk::TextKeySelect %W 1.0
}
bind Text <Control-End> {
    tk::TextSetCursor %W {end - 1 char}
}
bind Text <Control-Shift-End> {
    tk::TextKeySelect %W {end - 1 char}
}

bind Text <Tab> {
    if { [string equal [%W cget -state] "normal"] } {
	tk::TextInsert %W \t
	focus %W
	break
    }
}
bind Text <Shift-Tab> {
    # Needed only to keep <Tab> binding from triggering;  doesn't
    # have to actually do anything.
    break
}
bind Text <Control-Tab> {
    focus [tk_focusNext %W]
}
bind Text <Control-Shift-Tab> {
    focus [tk_focusPrev %W]
}
bind Text <Control-i> {
    tk::TextInsert %W \t
}
bind Text <Return> {
    tk::TextInsert %W \n
    if {[%W cget -autoseparators]} {%W edit separator}
}
bind Text <Delete> {
    if {[%W tag nextrange sel 1.0 end] ne ""} {
	%W delete sel.first sel.last
    } else {
	%W delete insert
	%W see insert
    }
}
bind Text <BackSpace> {
    if {[%W tag nextrange sel 1.0 end] ne ""} {
	%W delete sel.first sel.last
    } elseif {[%W compare insert != 1.0]} {
	%W delete insert-1c
	%W see insert
    }
}

bind Text <Control-space> {
    %W mark set anchor insert
}
bind Text <Select> {
    %W mark set anchor insert
}
bind Text <Control-Shift-space> {
    set tk::Priv(selectMode) char
    tk::TextKeyExtend %W insert
}
bind Text <Shift-Select> {
    set tk::Priv(selectMode) char
    tk::TextKeyExtend %W insert
}
bind Text <Control-slash> {
    %W tag add sel 1.0 end
}
bind Text <Control-backslash> {
    %W tag remove sel 1.0 end
}
bind Text <<Cut>> {
    tk_textCut %W
}
bind Text <<Copy>> {
    tk_textCopy %W
}
bind Text <<Paste>> {
    tk_textPaste %W
}
bind Text <<Clear>> {
    catch {%W delete sel.first sel.last}
}
bind Text <<PasteSelection>> {
    if {$tk_strictMotif || ![info exists tk::Priv(mouseMoved)]
	|| !$tk::Priv(mouseMoved)} {
	tk::TextPasteSelection %W %x %y
    }
}
bind Text <Insert> {
    catch {tk::TextInsert %W [::tk::GetSelection %W PRIMARY]}
}
bind Text <KeyPress> {
    tk::TextInsert %W %A
}

# Ignore all Alt, Meta, and Control keypresses unless explicitly bound.
# Otherwise, if a widget binding for one of these is defined, the
# <KeyPress> class binding will also fire and insert the character,
# which is wrong.  Ditto for <Escape>.

bind Text <Alt-KeyPress> {# nothing }
bind Text <Meta-KeyPress> {# nothing}
bind Text <Control-KeyPress> {# nothing}
bind Text <Escape> {# nothing}
bind Text <KP_Enter> {# nothing}
if {[string equal [tk windowingsystem] "classic"]
	|| [string equal [tk windowingsystem] "aqua"]} {
    bind Text <Command-KeyPress> {# nothing}
}

# Additional emacs-like bindings:

bind Text <Control-a> {
    if {!$tk_strictMotif} {
	tk::TextSetCursor %W {insert linestart}
    }
}
bind Text <Control-b> {
    if {!$tk_strictMotif} {
	tk::TextSetCursor %W insert-1c
    }
}
bind Text <Control-d> {
    if {!$tk_strictMotif} {
	%W delete insert
    }
}
bind Text <Control-e> {
    if {!$tk_strictMotif} {
	tk::TextSetCursor %W {insert lineend}
    }
}
bind Text <Control-f> {
    if {!$tk_strictMotif} {
	tk::TextSetCursor %W insert+1c
    }
}
bind Text <Control-k> {
    if {!$tk_strictMotif} {
	if {[%W compare insert == {insert lineend}]} {
	    %W delete insert
	} else {
	    %W delete insert {insert lineend}
	}
    }
}
bind Text <Control-n> {
    if {!$tk_strictMotif} {
	tk::TextSetCursor %W [tk::TextUpDownLine %W 1]
    }
}
bind Text <Control-o> {
    if {!$tk_strictMotif} {
	%W insert insert \n
	%W mark set insert insert-1c
    }
}
bind Text <Control-p> {
    if {!$tk_strictMotif} {
	tk::TextSetCursor %W [tk::TextUpDownLine %W -1]
    }
}
bind Text <Control-t> {
    if {!$tk_strictMotif} {
	tk::TextTranspose %W
    }
}

bind Text <<Undo>> {
    catch { %W edit undo }
}

bind Text <<Redo>> {
    catch { %W edit redo }
}

if {$tcl_platform(platform) ne "windows"} {
bind Text <Control-v> {
    if {!$tk_strictMotif} {
	tk::TextScrollPages %W 1
    }
}
}

bind Text <Meta-b> {
    if {!$tk_strictMotif} {
	tk::TextSetCursor %W [tk::TextPrevPos %W insert tcl_startOfPreviousWord]
    }
}
bind Text <Meta-d> {
    if {!$tk_strictMotif} {
	%W delete insert [tk::TextNextWord %W insert]
    }
}
bind Text <Meta-f> {
    if {!$tk_strictMotif} {
	tk::TextSetCursor %W [tk::TextNextWord %W insert]
    }
}
bind Text <Meta-less> {
    if {!$tk_strictMotif} {
	tk::TextSetCursor %W 1.0
    }
}
bind Text <Meta-greater> {
    if {!$tk_strictMotif} {
	tk::TextSetCursor %W end-1c
    }
}
bind Text <Meta-BackSpace> {
    if {!$tk_strictMotif} {
	%W delete [tk::TextPrevPos %W insert tcl_startOfPreviousWord] insert
    }
}
bind Text <Meta-Delete> {
    if {!$tk_strictMotif} {
	%W delete [tk::TextPrevPos %W insert tcl_startOfPreviousWord] insert
    }
}

# Macintosh only bindings:

# if text black & highlight black -> text white, other text the same
if {[string equal [tk windowingsystem] "classic"]
	|| [string equal [tk windowingsystem] "aqua"]} {
bind Text <FocusIn> {
    %W tag configure sel -borderwidth 0
    %W configure -selectbackground systemHighlight -selectforeground systemHighlightText
}
bind Text <FocusOut> {
    %W tag configure sel -borderwidth 1
    %W configure -selectbackground white -selectforeground black
}
bind Text <Option-Left> {
    tk::TextSetCursor %W [tk::TextPrevPos %W insert tcl_startOfPreviousWord]
}
bind Text <Option-Right> {
    tk::TextSetCursor %W [tk::TextNextWord %W insert]
}
bind Text <Option-Up> {
    tk::TextSetCursor %W [tk::TextPrevPara %W insert]
}
bind Text <Option-Down> {
    tk::TextSetCursor %W [tk::TextNextPara %W insert]
}
bind Text <Shift-Option-Left> {
    tk::TextKeySelect %W [tk::TextPrevPos %W insert tcl_startOfPreviousWord]
}
bind Text <Shift-Option-Right> {
    tk::TextKeySelect %W [tk::TextNextWord %W insert]
}
bind Text <Shift-Option-Up> {
    tk::TextKeySelect %W [tk::TextPrevPara %W insert]
}
bind Text <Shift-Option-Down> {
    tk::TextKeySelect %W [tk::TextNextPara %W insert]
}

# End of Mac only bindings
}

# A few additional bindings of my own.

bind Text <Control-h> {
    if {!$tk_strictMotif} {
	if {[%W compare insert != 1.0]} {
	    %W delete insert-1c
	    %W see insert
	}
    }
}
bind Text <2> {
    if {!$tk_strictMotif} {
	tk::TextScanMark %W %x %y
    }
}
bind Text <B2-Motion> {
    if {!$tk_strictMotif} {
	tk::TextScanDrag %W %x %y
    }
}
set ::tk::Priv(prevPos) {}

# The MouseWheel will typically only fire on Windows.  However,
# someone could use the "event generate" command to produce one
# on other platforms.

if {[string equal [tk windowingsystem] "classic"]
	|| [string equal [tk windowingsystem] "aqua"]} {
    bind Text <MouseWheel> {
        %W yview scroll [expr {- (%D)}] units
    }
    bind Text <Option-MouseWheel> {
        %W yview scroll [expr {-10 * (%D)}] units
    }
    bind Text <Shift-MouseWheel> {
        %W xview scroll [expr {- (%D)}] units
    }
    bind Text <Shift-Option-MouseWheel> {
        %W xview scroll [expr {-10 * (%D)}] units
    }
} else {
    bind Text <MouseWheel> {
        %W yview scroll [expr {- (%D / 120) * 4}] units
    }
}

if {[string equal "x11" [tk windowingsystem]]} {
    # Support for mousewheels on Linux/Unix commonly comes through mapping
    # the wheel to the extended buttons.  If you have a mousewheel, find
    # Linux configuration info at:
    #	http://www.inria.fr/koala/colas/mouse-wheel-scroll/
    bind Text <4> {
	if {!$tk_strictMotif} {
	    %W yview scroll -5 units
	}
    }
    bind Text <5> {
	if {!$tk_strictMotif} {
	    %W yview scroll 5 units
	}
    }
}

# ::tk::TextClosestGap --
# Given x and y coordinates, this procedure finds the closest boundary
# between characters to the given coordinates and returns the index
# of the character just after the boundary.
#
# Arguments:
# w -		The text window.
# x -		X-coordinate within the window.
# y -		Y-coordinate within the window.

proc ::tk::TextClosestGap {w x y} {
    set pos [$w index @$x,$y]
    set bbox [$w bbox $pos]
    if {[string equal $bbox ""]} {
	return $pos
    }
    if {($x - [lindex $bbox 0]) < ([lindex $bbox 2]/2)} {
	return $pos
    }
    $w index "$pos + 1 char"
}

# ::tk::TextButton1 --
# This procedure is invoked to handle button-1 presses in text
# widgets.  It moves the insertion cursor, sets the selection anchor,
# and claims the input focus.
#
# Arguments:
# w -		The text window in which the button was pressed.
# x -		The x-coordinate of the button press.
# y -		The x-coordinate of the button press.

proc ::tk::TextButton1 {w x y} {
    variable ::tk::Priv

    set Priv(selectMode) char
    set Priv(mouseMoved) 0
    set Priv(pressX) $x
    $w mark set insert [TextClosestGap $w $x $y]
    $w mark set anchor insert
    # Allow focus in any case on Windows, because that will let the
    # selection be displayed even for state disabled text widgets.
    if {[string equal $::tcl_platform(platform) "windows"] \
	    || [string equal [$w cget -state] "normal"]} {focus $w}
    if {[$w cget -autoseparators]} {$w edit separator}
}

# ::tk::TextSelectTo --
# This procedure is invoked to extend the selection, typically when
# dragging it with the mouse.  Depending on the selection mode (character,
# word, line) it selects in different-sized units.  This procedure
# ignores mouse motions initially until the mouse has moved from
# one character to another or until there have been multiple clicks.
#
# Arguments:
# w -		The text window in which the button was pressed.
# x -		Mouse x position.
# y - 		Mouse y position.

proc ::tk::TextSelectTo {w x y {extend 0}} {
    global tcl_platform
    variable ::tk::Priv

    set cur [TextClosestGap $w $x $y]
    if {[catch {$w index anchor}]} {
	$w mark set anchor $cur
    }
    set anchor [$w index anchor]
    if {[$w compare $cur != $anchor] || (abs($Priv(pressX) - $x) >= 3)} {
	set Priv(mouseMoved) 1
    }
    switch $Priv(selectMode) {
	char {
	    if {[$w compare $cur < anchor]} {
		set first $cur
		set last anchor
	    } else {
		set first anchor
		set last $cur
	    }
	}
	word {
	    if {[$w compare $cur < anchor]} {
		set first [TextPrevPos $w "$cur + 1c" tcl_wordBreakBefore]
		if { !$extend } {
		    set last [TextNextPos $w "anchor" tcl_wordBreakAfter]
		} else {
		    set last anchor
		}
	    } else {
		set last [TextNextPos $w "$cur - 1c" tcl_wordBreakAfter]
		if { !$extend } {
		    set first [TextPrevPos $w anchor tcl_wordBreakBefore]
		} else {
		    set first anchor
		}
	    }
	}
	line {
	    if {[$w compare $cur < anchor]} {
		set first [$w index "$cur linestart"]
		set last [$w index "anchor - 1c lineend + 1c"]
	    } else {
		set first [$w index "anchor linestart"]
		set last [$w index "$cur lineend + 1c"]
	    }
	}
    }
    if {$Priv(mouseMoved) || $Priv(selectMode) ne "char"} {
	$w tag remove sel 0.0 end
	$w mark set insert $cur
	$w tag add sel $first $last
	$w tag remove sel $last end
	update idletasks
    }
}

# ::tk::TextKeyExtend --
# This procedure handles extending the selection from the keyboard,
# where the point to extend to is really the boundary between two
# characters rather than a particular character.
#
# Arguments:
# w -		The text window.
# index -	The point to which the selection is to be extended.

proc ::tk::TextKeyExtend {w index} {

    set cur [$w index $index]
    if {[catch {$w index anchor}]} {
	$w mark set anchor $cur
    }
    set anchor [$w index anchor]
    if {[$w compare $cur < anchor]} {
	set first $cur
	set last anchor
    } else {
	set first anchor
	set last $cur
    }
    $w tag remove sel 0.0 $first
    $w tag add sel $first $last
    $w tag remove sel $last end
}

# ::tk::TextPasteSelection --
# This procedure sets the insertion cursor to the mouse position,
# inserts the selection, and sets the focus to the window.
#
# Arguments:
# w -		The text window.
# x, y - 	Position of the mouse.

proc ::tk::TextPasteSelection {w x y} {
    $w mark set insert [TextClosestGap $w $x $y]
    if {![catch {::tk::GetSelection $w PRIMARY} sel]} {
	set oldSeparator [$w cget -autoseparators]
	if {$oldSeparator} {
	    $w configure -autoseparators 0
	    $w edit separator
	}
	$w insert insert $sel
	if {$oldSeparator} {
	    $w edit separator
	    $w configure -autoseparators 1
	}
    }
    if {[string equal [$w cget -state] "normal"]} {focus $w}
}

# ::tk::TextAutoScan --
# This procedure is invoked when the mouse leaves a text window
# with button 1 down.  It scrolls the window up, down, left, or right,
# depending on where the mouse is (this information was saved in
# ::tk::Priv(x) and ::tk::Priv(y)), and reschedules itself as an "after"
# command so that the window continues to scroll until the mouse
# moves back into the window or the mouse button is released.
#
# Arguments:
# w -		The text window.

proc ::tk::TextAutoScan {w} {
    variable ::tk::Priv
    if {![winfo exists $w]} return
    if {$Priv(y) >= [winfo height $w]} {
	$w yview scroll 2 units
    } elseif {$Priv(y) < 0} {
	$w yview scroll -2 units
    } elseif {$Priv(x) >= [winfo width $w]} {
	$w xview scroll 2 units
    } elseif {$Priv(x) < 0} {
	$w xview scroll -2 units
    } else {
	return
    }
    TextSelectTo $w $Priv(x) $Priv(y)
    set Priv(afterId) [after 50 [list tk::TextAutoScan $w]]
}

# ::tk::TextSetCursor
# Move the insertion cursor to a given position in a text.  Also
# clears the selection, if there is one in the text, and makes sure
# that the insertion cursor is visible.  Also, don't let the insertion
# cursor appear on the dummy last line of the text.
#
# Arguments:
# w -		The text window.
# pos -		The desired new position for the cursor in the window.

proc ::tk::TextSetCursor {w pos} {

    if {[$w compare $pos == end]} {
	set pos {end - 1 chars}
    }
    $w mark set insert $pos
    $w tag remove sel 1.0 end
    $w see insert
    if {[$w cget -autoseparators]} {$w edit separator}
}

# ::tk::TextKeySelect
# This procedure is invoked when stroking out selections using the
# keyboard.  It moves the cursor to a new position, then extends
# the selection to that position.
#
# Arguments:
# w -		The text window.
# new -		A new position for the insertion cursor (the cursor hasn't
#		actually been moved to this position yet).

proc ::tk::TextKeySelect {w new} {

    if {[string equal [$w tag nextrange sel 1.0 end] ""]} {
	if {[$w compare $new < insert]} {
	    $w tag add sel $new insert
	} else {
	    $w tag add sel insert $new
	}
	$w mark set anchor insert
    } else {
	if {[$w compare $new < anchor]} {
	    set first $new
	    set last anchor
	} else {
	    set first anchor
	    set last $new
	}
	$w tag remove sel 1.0 $first
	$w tag add sel $first $last
	$w tag remove sel $last end
    }
    $w mark set insert $new
    $w see insert
    update idletasks
}

# ::tk::TextResetAnchor --
# Set the selection anchor to whichever end is farthest from the
# index argument.  One special trick: if the selection has two or
# fewer characters, just leave the anchor where it is.  In this
# case it doesn't matter which point gets chosen for the anchor,
# and for the things like Shift-Left and Shift-Right this produces
# better behavior when the cursor moves back and forth across the
# anchor.
#
# Arguments:
# w -		The text widget.
# index -	Position at which mouse button was pressed, which determines
#		which end of selection should be used as anchor point.

proc ::tk::TextResetAnchor {w index} {

    if {[string equal [$w tag ranges sel] ""]} {
	# Don't move the anchor if there is no selection now; this makes
	# the widget behave "correctly" when the user clicks once, then
	# shift-clicks somewhere -- ie, the area between the two clicks will be
	# selected. [Bug: 5929].
	return
    }
    set a [$w index $index]
    set b [$w index sel.first]
    set c [$w index sel.last]
    if {[$w compare $a < $b]} {
	$w mark set anchor sel.last
	return
    }
    if {[$w compare $a > $c]} {
	$w mark set anchor sel.first
	return
    }
    scan $a "%d.%d" lineA chA
    scan $b "%d.%d" lineB chB
    scan $c "%d.%d" lineC chC
    if {$lineB < $lineC+2} {
	set total [string length [$w get $b $c]]
	if {$total <= 2} {
	    return
	}
	if {[string length [$w get $b $a]] < ($total/2)} {
	    $w mark set anchor sel.last
	} else {
	    $w mark set anchor sel.first
	}
	return
    }
    if {($lineA-$lineB) < ($lineC-$lineA)} {
	$w mark set anchor sel.last
    } else {
	$w mark set anchor sel.first
    }
}

# ::tk::TextInsert --
# Insert a string into a text at the point of the insertion cursor.
# If there is a selection in the text, and it covers the point of the
# insertion cursor, then delete the selection before inserting.
#
# Arguments:
# w -		The text window in which to insert the string
# s -		The string to insert (usually just a single character)

proc ::tk::TextInsert {w s} {
    if {[string equal $s ""] || [string equal [$w cget -state] "disabled"]} {
	return
    }
    set compound 0
    catch {
	if {[$w compare sel.first <= insert] \
		&& [$w compare sel.last >= insert]} {
            set oldSeparator [$w cget -autoseparators]
            if { $oldSeparator } {
                $w configure -autoseparators 0
                $w edit separator
                set compound 1
            }
	    $w delete sel.first sel.last
	}
    }
    $w insert insert $s
    $w see insert
    if { $compound && $oldSeparator } {
        $w edit separator
        $w configure -autoseparators 1
    }
}

# ::tk::TextUpDownLine --
# Returns the index of the character one line above or below the
# insertion cursor.  There are two tricky things here.  First,
# we want to maintain the original column across repeated operations,
# even though some lines that will get passed through don't have
# enough characters to cover the original column.  Second, don't
# try to scroll past the beginning or end of the text.
#
# Arguments:
# w -		The text window in which the cursor is to move.
# n -		The number of lines to move: -1 for up one line,
#		+1 for down one line.

proc ::tk::TextUpDownLine {w n} {
    variable ::tk::Priv

    set i [$w index insert]
    scan $i "%d.%d" line char
    if {$Priv(prevPos) ne $i} {
	set Priv(char) $char
    }
    set new [$w index [expr {$line + $n}].$Priv(char)]
    if {[$w compare $new == end] || [$w compare $new == "insert linestart"]} {
	set new $i
    }
    set Priv(prevPos) $new
    return $new
}

# ::tk::TextPrevPara --
# Returns the index of the beginning of the paragraph just before a given
# position in the text (the beginning of a paragraph is the first non-blank
# character after a blank line).
#
# Arguments:
# w -		The text window in which the cursor is to move.
# pos -		Position at which to start search.

proc ::tk::TextPrevPara {w pos} {
    set pos [$w index "$pos linestart"]
    while {1} {
	if {([string equal [$w get "$pos - 1 line"] "\n"] \
		 && [$w get $pos] ne "\n") || [string equal $pos 1.0]} {
	    if {[regexp -indices {^[ 	]+(.)} [$w get $pos "$pos lineend"] \
		    dummy index]} {
		set pos [$w index "$pos + [lindex $index 0] chars"]
	    }
	    if {[$w compare $pos != insert] || [lindex [split $pos .] 0] == 1} {
		return $pos
	    }
	}
	set pos [$w index "$pos - 1 line"]
    }
}

# ::tk::TextNextPara --
# Returns the index of the beginning of the paragraph just after a given
# position in the text (the beginning of a paragraph is the first non-blank
# character after a blank line).
#
# Arguments:
# w -		The text window in which the cursor is to move.
# start -	Position at which to start search.

proc ::tk::TextNextPara {w start} {
    set pos [$w index "$start linestart + 1 line"]
    while {[$w get $pos] ne "\n"} {
	if {[$w compare $pos == end]} {
	    return [$w index "end - 1c"]
	}
	set pos [$w index "$pos + 1 line"]
    }
    while {[$w get $pos] eq "\n"} {
	set pos [$w index "$pos + 1 line"]
	if {[$w compare $pos == end]} {
	    return [$w index "end - 1c"]
	}
    }
    if {[regexp -indices {^[ 	]+(.)} [$w get $pos "$pos lineend"] \
	    dummy index]} {
	return [$w index "$pos + [lindex $index 0] chars"]
    }
    return $pos
}

# ::tk::TextScrollPages --
# This is a utility procedure used in bindings for moving up and down
# pages and possibly extending the selection along the way.  It scrolls
# the view in the widget by the number of pages, and it returns the
# index of the character that is at the same position in the new view
# as the insertion cursor used to be in the old view.
#
# Arguments:
# w -		The text window in which the cursor is to move.
# count -	Number of pages forward to scroll;  may be negative
#		to scroll backwards.

proc ::tk::TextScrollPages {w count} {
    set bbox [$w bbox insert]
    $w yview scroll $count pages
    if {[string equal $bbox ""]} {
	return [$w index @[expr {[winfo height $w]/2}],0]
    }
    return [$w index @[lindex $bbox 0],[lindex $bbox 1]]
}

# ::tk::TextTranspose --
# This procedure implements the "transpose" function for text widgets.
# It tranposes the characters on either side of the insertion cursor,
# unless the cursor is at the end of the line.  In this case it
# transposes the two characters to the left of the cursor.  In either
# case, the cursor ends up to the right of the transposed characters.
#
# Arguments:
# w -		Text window in which to transpose.

proc ::tk::TextTranspose w {
    set pos insert
    if {[$w compare $pos != "$pos lineend"]} {
	set pos [$w index "$pos + 1 char"]
    }
    set new [$w get "$pos - 1 char"][$w get  "$pos - 2 char"]
    if {[$w compare "$pos - 1 char" == 1.0]} {
	return
    }
    # ensure this is seen as an atomic op to undo
    set autosep [$w cget -autoseparators]
    if {$autosep} {
	$w configure -autoseparators 0
	$w edit separator
    }
    $w delete "$pos - 2 char" $pos
    $w insert insert $new
    $w see insert
    if {$autosep} {
	$w edit separator
	$w configure -autoseparators $autosep
    }
}

# ::tk_textCopy --
# This procedure copies the selection from a text widget into the
# clipboard.
#
# Arguments:
# w -		Name of a text widget.

proc ::tk_textCopy w {
    if {![catch {set data [$w get sel.first sel.last]}]} {
	clipboard clear -displayof $w
	clipboard append -displayof $w $data
    }
}

# ::tk_textCut --
# This procedure copies the selection from a text widget into the
# clipboard, then deletes the selection (if it exists in the given
# widget).
#
# Arguments:
# w -		Name of a text widget.

proc ::tk_textCut w {
    if {![catch {set data [$w get sel.first sel.last]}]} {
	clipboard clear -displayof $w
	clipboard append -displayof $w $data
	$w delete sel.first sel.last
    }
}

# ::tk_textPaste --
# This procedure pastes the contents of the clipboard to the insertion
# point in a text widget.
#
# Arguments:
# w -		Name of a text widget.

proc ::tk_textPaste w {
    global tcl_platform
    if {![catch {::tk::GetSelection $w CLIPBOARD} sel]} {
	# ensure this is seen as an atomic op to undo
	set oldSeparator [$w cget -autoseparators]
	if { $oldSeparator } {
	    $w configure -autoseparators 0
	    $w edit separator
	}
	if {[tk windowingsystem] ne "x11"} {
	    catch { $w delete sel.first sel.last }
	}
	$w insert insert $sel
	if { $oldSeparator } {
	    $w edit separator
	    $w configure -autoseparators 1
	}
    }
}

# ::tk::TextNextWord --
# Returns the index of the next word position after a given position in the
# text.  The next word is platform dependent and may be either the next
# end-of-word position or the next start-of-word position after the next
# end-of-word position.
#
# Arguments:
# w -		The text window in which the cursor is to move.
# start -	Position at which to start search.

if {[string equal $tcl_platform(platform) "windows"]}  {
    proc ::tk::TextNextWord {w start} {
	TextNextPos $w [TextNextPos $w $start tcl_endOfWord] \
	    tcl_startOfNextWord
    }
} else {
    proc ::tk::TextNextWord {w start} {
	TextNextPos $w $start tcl_endOfWord
    }
}

# ::tk::TextNextPos --
# Returns the index of the next position after the given starting
# position in the text as computed by a specified function.
#
# Arguments:
# w -		The text window in which the cursor is to move.
# start -	Position at which to start search.
# op -		Function to use to find next position.

proc ::tk::TextNextPos {w start op} {
    set text ""
    set cur $start
    while {[$w compare $cur < end]} {
	set text $text[$w get $cur "$cur lineend + 1c"]
	set pos [$op $text 0]
	if {$pos >= 0} {
	    ## Adjust for embedded windows and images
	    ## dump gives us 3 items per window/image
	    set dump [$w dump -image -window $start "$start + $pos c"]
	    if {[llength $dump]} {
		set pos [expr {$pos + ([llength $dump]/3)}]
	    }
	    return [$w index "$start + $pos c"]
	}
	set cur [$w index "$cur lineend +1c"]
    }
    return end
}

# ::tk::TextPrevPos --
# Returns the index of the previous position before the given starting
# position in the text as computed by a specified function.
#
# Arguments:
# w -		The text window in which the cursor is to move.
# start -	Position at which to start search.
# op -		Function to use to find next position.

proc ::tk::TextPrevPos {w start op} {
    set text ""
    set cur $start
    while {[$w compare $cur > 0.0]} {
	set text [$w get "$cur linestart - 1c" $cur]$text
	set pos [$op $text end]
	if {$pos >= 0} {
	    ## Adjust for embedded windows and images
	    ## dump gives us 3 items per window/image
	    set dump [$w dump -image -window "$cur linestart" "$start - 1c"]
	    if {[llength $dump]} {
		## This is a hokey extra hack for control-arrow movement
		## that should be in a while loop to be correct (hobbs)
		if {[$w compare [lindex $dump 2] > \
			"$cur linestart - 1c + $pos c"]} {
		    incr pos -1
		}
		set pos [expr {$pos + ([llength $dump]/3)}]
	    }
	    return [$w index "$cur linestart - 1c + $pos c"]
	}
	set cur [$w index "$cur linestart - 1c"]
    }
    return 0.0
}

# ::tk::TextScanMark --
#
# Marks the start of a possible scan drag operation
#
# Arguments:
# w -	The text window from which the text to get
# x -	x location on screen
# y -	y location on screen

proc ::tk::TextScanMark {w x y} {
    $w scan mark $x $y
    set ::tk::Priv(x) $x
    set ::tk::Priv(y) $y
    set ::tk::Priv(mouseMoved) 0
}

# ::tk::TextScanDrag --
#
# Marks the start of a possible scan drag operation
#
# Arguments:
# w -	The text window from which the text to get
# x -	x location on screen
# y -	y location on screen

proc ::tk::TextScanDrag {w x y} {
    # Make sure these exist, as some weird situations can trigger the
    # motion binding without the initial press.  [Bug #220269]
    if {![info exists ::tk::Priv(x)]} { set ::tk::Priv(x) $x }
    if {![info exists ::tk::Priv(y)]} { set ::tk::Priv(y) $y }
    if {($x != $::tk::Priv(x)) || ($y != $::tk::Priv(y))} {
	set ::tk::Priv(mouseMoved) 1
    }
    if {[info exists ::tk::Priv(mouseMoved)] && $::tk::Priv(mouseMoved)} {
	$w scan dragto $x $y
    }
}