summaryrefslogtreecommitdiffstats
path: root/library/entry.tcl
blob: 5392bcd07b74deb49784a688d24647694261873f (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
# entry.tcl --
#
# This file defines the default bindings for Tk entry widgets and provides
# procedures that help in implementing those bindings.
#
# RCS: @(#) $Id: entry.tcl,v 1.15 2001/07/03 01:03:16 hobbs Exp $
#
# Copyright (c) 1992-1994 The Regents of the University of California.
# Copyright (c) 1994-1997 Sun Microsystems, Inc.
#
# See the file "license.terms" for information on usage and redistribution
# of this file, and for a DISCLAIMER OF ALL WARRANTIES.
#

#-------------------------------------------------------------------------
# Elements of tkPriv 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.
# mouseMoved -		Non-zero means the mouse has moved a significant
#			amount since the button went down (so, for example,
#			start dragging out a selection).
# pressX -		X-coordinate at which the mouse button was pressed.
# selectMode -		The style of selection currently underway:
#			char, word, or line.
# x, y -		Last known mouse coordinates for scanning
#			and auto-scanning.
# data -		Used for Cut and Copy
#-------------------------------------------------------------------------

#-------------------------------------------------------------------------
# The code below creates the default class bindings for entries.
#-------------------------------------------------------------------------
bind Entry <<Cut>> {
    if {![catch {tkEntryGetSelection %W} tkPriv(data)]} {
	clipboard clear -displayof %W
	clipboard append -displayof %W $tkPriv(data)
	%W delete sel.first sel.last
	unset tkPriv(data)
    }
}
bind Entry <<Copy>> {
    if {![catch {tkEntryGetSelection %W} tkPriv(data)]} {
	clipboard clear -displayof %W
	clipboard append -displayof %W $tkPriv(data)
	unset tkPriv(data)
    }
}
bind Entry <<Paste>> {
    global tcl_platform
    catch {
	if {[string compare $tcl_platform(platform) "unix"]} {
	    catch {
		%W delete sel.first sel.last
	    }
	}
	%W insert insert [::tk::GetSelection %W CLIPBOARD]
	tkEntrySeeInsert %W
    }
}
bind Entry <<Clear>> {
    %W delete sel.first sel.last
}
bind Entry <<PasteSelection>> {
    if {!$tkPriv(mouseMoved) || $tk_strictMotif} {
	tkEntryPaste %W %x
    }
}

# Standard Motif bindings:

bind Entry <1> {
    tkEntryButton1 %W %x
    %W selection clear
}
bind Entry <B1-Motion> {
    set tkPriv(x) %x
    tkEntryMouseSelect %W %x
}
bind Entry <Double-1> {
    set tkPriv(selectMode) word
    tkEntryMouseSelect %W %x
    catch {%W icursor sel.first}
}
bind Entry <Triple-1> {
    set tkPriv(selectMode) line
    tkEntryMouseSelect %W %x
    %W icursor 0
}
bind Entry <Shift-1> {
    set tkPriv(selectMode) char
    %W selection adjust @%x
}
bind Entry <Double-Shift-1>	{
    set tkPriv(selectMode) word
    tkEntryMouseSelect %W %x
}
bind Entry <Triple-Shift-1>	{
    set tkPriv(selectMode) line
    tkEntryMouseSelect %W %x
}
bind Entry <B1-Leave> {
    set tkPriv(x) %x
    tkEntryAutoScan %W
}
bind Entry <B1-Enter> {
    tkCancelRepeat
}
bind Entry <ButtonRelease-1> {
    tkCancelRepeat
}
bind Entry <Control-1> {
    %W icursor @%x
}

bind Entry <Left> {
    tkEntrySetCursor %W [expr {[%W index insert] - 1}]
}
bind Entry <Right> {
    tkEntrySetCursor %W [expr {[%W index insert] + 1}]
}
bind Entry <Shift-Left> {
    tkEntryKeySelect %W [expr {[%W index insert] - 1}]
    tkEntrySeeInsert %W
}
bind Entry <Shift-Right> {
    tkEntryKeySelect %W [expr {[%W index insert] + 1}]
    tkEntrySeeInsert %W
}
bind Entry <Control-Left> {
    tkEntrySetCursor %W [tkEntryPreviousWord %W insert]
}
bind Entry <Control-Right> {
    tkEntrySetCursor %W [tkEntryNextWord %W insert]
}
bind Entry <Shift-Control-Left> {
    tkEntryKeySelect %W [tkEntryPreviousWord %W insert]
    tkEntrySeeInsert %W
}
bind Entry <Shift-Control-Right> {
    tkEntryKeySelect %W [tkEntryNextWord %W insert]
    tkEntrySeeInsert %W
}
bind Entry <Home> {
    tkEntrySetCursor %W 0
}
bind Entry <Shift-Home> {
    tkEntryKeySelect %W 0
    tkEntrySeeInsert %W
}
bind Entry <End> {
    tkEntrySetCursor %W end
}
bind Entry <Shift-End> {
    tkEntryKeySelect %W end
    tkEntrySeeInsert %W
}

bind Entry <Delete> {
    if {[%W selection present]} {
	%W delete sel.first sel.last
    } else {
	%W delete insert
    }
}
bind Entry <BackSpace> {
    tkEntryBackspace %W
}

bind Entry <Control-space> {
    %W selection from insert
}
bind Entry <Select> {
    %W selection from insert
}
bind Entry <Control-Shift-space> {
    %W selection adjust insert
}
bind Entry <Shift-Select> {
    %W selection adjust insert
}
bind Entry <Control-slash> {
    %W selection range 0 end
}
bind Entry <Control-backslash> {
    %W selection clear
}
bind Entry <KeyPress> {
    tkEntryInsert %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, Return, and Tab.

bind Entry <Alt-KeyPress> {# nothing}
bind Entry <Meta-KeyPress> {# nothing}
bind Entry <Control-KeyPress> {# nothing}
bind Entry <Escape> {# nothing}
bind Entry <Return> {# nothing}
bind Entry <KP_Enter> {# nothing}
bind Entry <Tab> {# nothing}
if {[string equal $tcl_platform(platform) "macintosh"]} {
	bind Entry <Command-KeyPress> {# nothing}
}

# On Windows, paste is done using Shift-Insert.  Shift-Insert already
# generates the <<Paste>> event, so we don't need to do anything here.
if {[string compare $tcl_platform(platform) "windows"]} {
    bind Entry <Insert> {
	catch {tkEntryInsert %W [::tk::GetSelection %W PRIMARY]}
    }
}

# Additional emacs-like bindings:

bind Entry <Control-a> {
    if {!$tk_strictMotif} {
	tkEntrySetCursor %W 0
    }
}
bind Entry <Control-b> {
    if {!$tk_strictMotif} {
	tkEntrySetCursor %W [expr {[%W index insert] - 1}]
    }
}
bind Entry <Control-d> {
    if {!$tk_strictMotif} {
	%W delete insert
    }
}
bind Entry <Control-e> {
    if {!$tk_strictMotif} {
	tkEntrySetCursor %W end
    }
}
bind Entry <Control-f> {
    if {!$tk_strictMotif} {
	tkEntrySetCursor %W [expr {[%W index insert] + 1}]
    }
}
bind Entry <Control-h> {
    if {!$tk_strictMotif} {
	tkEntryBackspace %W
    }
}
bind Entry <Control-k> {
    if {!$tk_strictMotif} {
	%W delete insert end
    }
}
bind Entry <Control-t> {
    if {!$tk_strictMotif} {
	tkEntryTranspose %W
    }
}
bind Entry <Meta-b> {
    if {!$tk_strictMotif} {
	tkEntrySetCursor %W [tkEntryPreviousWord %W insert]
    }
}
bind Entry <Meta-d> {
    if {!$tk_strictMotif} {
	%W delete insert [tkEntryNextWord %W insert]
    }
}
bind Entry <Meta-f> {
    if {!$tk_strictMotif} {
	tkEntrySetCursor %W [tkEntryNextWord %W insert]
    }
}
bind Entry <Meta-BackSpace> {
    if {!$tk_strictMotif} {
	%W delete [tkEntryPreviousWord %W insert] insert
    }
}
bind Entry <Meta-Delete> {
    if {!$tk_strictMotif} {
	%W delete [tkEntryPreviousWord %W insert] insert
    }
}

# A few additional bindings of my own.

bind Entry <2> {
    if {!$tk_strictMotif} {
	%W scan mark %x
	set tkPriv(x) %x
	set tkPriv(y) %y
	set tkPriv(mouseMoved) 0
    }
}
bind Entry <B2-Motion> {
    if {!$tk_strictMotif} {
	if {abs(%x-$tkPriv(x)) > 2} {
	    set tkPriv(mouseMoved) 1
	}
	%W scan dragto %x
    }
}

# tkEntryClosestGap --
# 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 entry window.
# x -		X-coordinate within the window.

proc tkEntryClosestGap {w x} {
    set pos [$w index @$x]
    set bbox [$w bbox $pos]
    if {($x - [lindex $bbox 0]) < ([lindex $bbox 2]/2)} {
	return $pos
    }
    incr pos
}

# tkEntryButton1 --
# This procedure is invoked to handle button-1 presses in entry
# widgets.  It moves the insertion cursor, sets the selection anchor,
# and claims the input focus.
#
# Arguments:
# w -		The entry window in which the button was pressed.
# x -		The x-coordinate of the button press.

proc tkEntryButton1 {w x} {
    global tkPriv

    set tkPriv(selectMode) char
    set tkPriv(mouseMoved) 0
    set tkPriv(pressX) $x
    $w icursor [tkEntryClosestGap $w $x]
    $w selection from insert
    if {[string compare "disabled" [$w cget -state]]} {focus $w}
}

# tkEntryMouseSelect --
# This procedure is invoked when dragging out a selection 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 entry window in which the button was pressed.
# x -		The x-coordinate of the mouse.

proc tkEntryMouseSelect {w x} {
    global tkPriv

    set cur [tkEntryClosestGap $w $x]
    set anchor [$w index anchor]
    if {($cur != $anchor) || (abs($tkPriv(pressX) - $x) >= 3)} {
	set tkPriv(mouseMoved) 1
    }
    switch $tkPriv(selectMode) {
	char {
	    if {$tkPriv(mouseMoved)} {
		if {$cur < $anchor} {
		    $w selection range $cur $anchor
		} elseif {$cur > $anchor} {
		    $w selection range $anchor $cur
		} else {
		    $w selection clear
		}
	    }
	}
	word {
	    if {$cur < [$w index anchor]} {
		set before [tcl_wordBreakBefore [$w get] $cur]
		set after [tcl_wordBreakAfter [$w get] [expr {$anchor-1}]]
	    } else {
		set before [tcl_wordBreakBefore [$w get] $anchor]
		set after [tcl_wordBreakAfter [$w get] [expr {$cur - 1}]]
	    }
	    if {$before < 0} {
		set before 0
	    }
	    if {$after < 0} {
		set after end
	    }
	    $w selection range $before $after
	}
	line {
	    $w selection range 0 end
	}
    }
    if {$tkPriv(mouseMoved)} {
        $w icursor $cur
    }
    update idletasks
}

# tkEntryPaste --
# This procedure sets the insertion cursor to the current mouse position,
# pastes the selection there, and sets the focus to the window.
#
# Arguments:
# w -		The entry window.
# x -		X position of the mouse.

proc tkEntryPaste {w x} {
    global tkPriv

    $w icursor [tkEntryClosestGap $w $x]
    catch {$w insert insert [::tk::GetSelection $w PRIMARY]}
    if {[string compare "disabled" [$w cget -state]]} {focus $w}
}

# tkEntryAutoScan --
# This procedure is invoked when the mouse leaves an entry window
# with button 1 down.  It scrolls the window left or right,
# depending on where the mouse is, 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 entry window.

proc tkEntryAutoScan {w} {
    global tkPriv
    set x $tkPriv(x)
    if {![winfo exists $w]} return
    if {$x >= [winfo width $w]} {
	$w xview scroll 2 units
	tkEntryMouseSelect $w $x
    } elseif {$x < 0} {
	$w xview scroll -2 units
	tkEntryMouseSelect $w $x
    }
    set tkPriv(afterId) [after 50 [list tkEntryAutoScan $w]]
}

# tkEntryKeySelect --
# 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 entry window.
# new -		A new position for the insertion cursor (the cursor hasn't
#		actually been moved to this position yet).

proc tkEntryKeySelect {w new} {
    if {![$w selection present]} {
	$w selection from insert
	$w selection to $new
    } else {
	$w selection adjust $new
    }
    $w icursor $new
}

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

proc tkEntryInsert {w s} {
    if {[string equal $s ""]} {
	return
    }
    catch {
	set insert [$w index insert]
	if {([$w index sel.first] <= $insert)
		&& ([$w index sel.last] >= $insert)} {
	    $w delete sel.first sel.last
	}
    }
    $w insert insert $s
    tkEntrySeeInsert $w
}

# tkEntryBackspace --
# Backspace over the character just before the insertion cursor.
# If backspacing would move the cursor off the left edge of the
# window, reposition the cursor at about the middle of the window.
#
# Arguments:
# w -		The entry window in which to backspace.

proc tkEntryBackspace w {
    if {[$w selection present]} {
	$w delete sel.first sel.last
    } else {
	set x [expr {[$w index insert] - 1}]
	if {$x >= 0} {$w delete $x}
	if {[$w index @0] >= [$w index insert]} {
	    set range [$w xview]
	    set left [lindex $range 0]
	    set right [lindex $range 1]
	    $w xview moveto [expr {$left - ($right - $left)/2.0}]
	}
    }
}

# tkEntrySeeInsert --
# Make sure that the insertion cursor is visible in the entry window.
# If not, adjust the view so that it is.
#
# Arguments:
# w -		The entry window.

proc tkEntrySeeInsert w {
    set c [$w index insert]
    if {($c < [$w index @0]) || ($c > [$w index @[winfo width $w]])} {
	$w xview $c
    }
}

# tkEntrySetCursor -
# Move the insertion cursor to a given position in an entry.  Also
# clears the selection, if there is one in the entry, and makes sure
# that the insertion cursor is visible.
#
# Arguments:
# w -		The entry window.
# pos -		The desired new position for the cursor in the window.

proc tkEntrySetCursor {w pos} {
    $w icursor $pos
    $w selection clear
    tkEntrySeeInsert $w
}

# tkEntryTranspose -
# This procedure implements the "transpose" function for entry 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 -		The entry window.

proc tkEntryTranspose w {
    set i [$w index insert]
    if {$i < [$w index end]} {
	incr i
    }
    set first [expr {$i-2}]
    if {$first < 0} {
	return
    }
    set new [string index [$w get] [expr {$i-1}]][string index [$w get] $first]
    $w delete $first $i
    $w insert insert $new
    tkEntrySeeInsert $w
}

# tkEntryNextWord --
# Returns the index of the next word position after a given position in the
# entry.  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 entry window in which the cursor is to move.
# start -	Position at which to start search.

if {[string equal $tcl_platform(platform) "windows"]}  {
    proc tkEntryNextWord {w start} {
	set pos [tcl_endOfWord [$w get] [$w index $start]]
	if {$pos >= 0} {
	    set pos [tcl_startOfNextWord [$w get] $pos]
	}
	if {$pos < 0} {
	    return end
	}
	return $pos
    }
} else {
    proc tkEntryNextWord {w start} {
	set pos [tcl_endOfWord [$w get] [$w index $start]]
	if {$pos < 0} {
	    return end
	}
	return $pos
    }
}

# tkEntryPreviousWord --
#
# Returns the index of the previous word position before a given
# position in the entry.
#
# Arguments:
# w -		The entry window in which the cursor is to move.
# start -	Position at which to start search.

proc tkEntryPreviousWord {w start} {
    set pos [tcl_startOfPreviousWord [$w get] [$w index $start]]
    if {$pos < 0} {
	return 0
    }
    return $pos
}
# tkEntryGetSelection --
#
# Returns the selected text of the entry with respect to the -show option.
#
# Arguments:
# w -         The entry window from which the text to get

proc tkEntryGetSelection {w} {
    set entryString [string range [$w get] [$w index sel.first] \
	    [expr {[$w index sel.last] - 1}]]
    if {[string compare [$w cget -show] ""]} {
	regsub -all . $entryString [string index [$w cget -show] 0] entryString
    }
    return $entryString
}