summaryrefslogtreecommitdiffstats
path: root/library/ttk/combobox.tcl
blob: 2378643049441fbaa54bac1538e77b78e6f345f5 (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
#
# Combobox bindings.
#
# <<NOTE-WM-TRANSIENT>>:
#
#	Need to set [wm transient] just before mapping the popdown
#	instead of when it's created, in case a containing frame
#	has been reparented [#1818441].
#
#	On Windows: setting [wm transient] prevents the parent
#	toplevel from becoming inactive when the popdown is posted
#	(Tk 8.4.8+)
#
#	On X11: WM_TRANSIENT_FOR on override-redirect windows
#	may be used by compositing managers and by EWMH-aware
#	window managers (even though the older ICCCM spec says
#	it's meaningless).
#
#	On OSX: [wm transient] does utterly the wrong thing.
#	Instead, we use [MacWindowStyle "help" "noActivates hideOnSuspend"].
#	The "noActivates" attribute prevents the parent toplevel
#	from deactivating when the popdown is posted, and is also
#	necessary for "help" windows to receive mouse events.
#	"hideOnSuspend" makes the popdown disappear (resp. reappear)
#	when the parent toplevel is deactivated (resp. reactivated).
#	(see [#1814778]).  Also set [wm resizable 0 0], to prevent
#	TkAqua from shrinking the scrollbar to make room for a grow box
#	that isn't there.
#
#	In order to work around other platform quirks in TkAqua,
#	[grab] and [focus] are set in <Map> bindings instead of
#	immediately after deiconifying the window.
#

namespace eval ttk::combobox {
    variable Values	;# Values($cb) is -listvariable of listbox widget
    variable State
    set State(entryPress) 0
}

### Combobox bindings.
#
# Duplicate the Entry bindings, override if needed:
#

ttk::copyBindings TEntry TCombobox

bind TCombobox <KeyPress-Down> 		{ ttk::combobox::Post %W }
bind TCombobox <KeyPress-Escape> 	{ ttk::combobox::Unpost %W }

bind TCombobox <ButtonPress-1> 		{ ttk::combobox::Press "" %W %x %y }
bind TCombobox <Shift-ButtonPress-1>	{ ttk::combobox::Press "s" %W %x %y }
bind TCombobox <Double-ButtonPress-1> 	{ ttk::combobox::Press "2" %W %x %y }
bind TCombobox <Triple-ButtonPress-1> 	{ ttk::combobox::Press "3" %W %x %y }
bind TCombobox <B1-Motion>		{ ttk::combobox::Drag %W %x }
bind TCombobox <Motion>			{ ttk::combobox::Motion %W %x %y }

ttk::bindMouseWheel TCombobox [list ttk::combobox::Scroll %W]

bind TCombobox <<TraverseIn>> 		{ ttk::combobox::TraverseIn %W }

### Combobox listbox bindings.
#
bind ComboboxListbox <ButtonRelease-1>	{ ttk::combobox::LBSelected %W }
bind ComboboxListbox <KeyPress-Return>	{ ttk::combobox::LBSelected %W }
bind ComboboxListbox <KeyPress-Escape>  { ttk::combobox::LBCancel %W }
bind ComboboxListbox <KeyPress-Tab>	{ ttk::combobox::LBTab %W next }
bind ComboboxListbox <<PrevWindow>>	{ ttk::combobox::LBTab %W prev }
bind ComboboxListbox <Destroy>		{ ttk::combobox::LBCleanup %W }
bind ComboboxListbox <Motion>		{ ttk::combobox::LBHover %W %x %y }
bind ComboboxListbox <Map>		{ focus -force %W }

switch -- [tk windowingsystem] {
    win32 {
	# Dismiss listbox when user switches to a different application.
	# NB: *only* do this on Windows (see #1814778)
	bind ComboboxListbox <FocusOut>		{ ttk::combobox::LBCancel %W }
    }
}

### Combobox popdown window bindings.
#
bind ComboboxPopdown	<Map>		{ ttk::combobox::MapPopdown %W }
bind ComboboxPopdown	<Unmap>		{ ttk::combobox::UnmapPopdown %W }
bind ComboboxPopdown	<ButtonPress> \
			{ ttk::combobox::Unpost [winfo parent %W] }

### Option database settings.
#

option add *TCombobox*Listbox.font TkTextFont widgetDefault
option add *TCombobox*Listbox.relief flat widgetDefault
option add *TCombobox*Listbox.highlightThickness 0 widgetDefault

## Platform-specific settings.
#
switch -- [tk windowingsystem] {
    x11 {
	option add *TCombobox*Listbox.background white widgetDefault
    }
    aqua {
	option add *TCombobox*Listbox.borderWidth 0 widgetDefault
    }
}

### Binding procedures.
#

## Press $mode $x $y -- ButtonPress binding for comboboxes.
#	Either post/unpost the listbox, or perform Entry widget binding,
#	depending on widget state and location of button press.
#
proc ttk::combobox::Press {mode w x y} {
    variable State

    $w instate disabled { return }

    set State(entryPress) [expr {
	   [$w instate !readonly]
	&& [string match *textarea [$w identify element $x $y]]
    }]

    focus $w
    if {$State(entryPress)} {
	switch -- $mode {
	    s 	{ ttk::entry::Shift-Press $w $x 	; # Shift }
	    2	{ ttk::entry::Select $w $x word 	; # Double click}
	    3	{ ttk::entry::Select $w $x line 	; # Triple click }
	    ""	-
	    default { ttk::entry::Press $w $x }
	}
    } else {
	Post $w
    }
}

## Drag -- B1-Motion binding for comboboxes.
#	If the initial ButtonPress event was handled by Entry binding,
#	perform Entry widget drag binding; otherwise nothing.
#
proc ttk::combobox::Drag {w x}  {
    variable State
    if {$State(entryPress)} {
	ttk::entry::Drag $w $x
    }
}

## Motion --
#	Set cursor.
#
proc ttk::combobox::Motion {w x y} {
    variable State
    ttk::saveCursor $w State(userConfCursor) [ttk::cursor text]
    if {   [$w identify $x $y] eq "textarea"
        && [$w instate {!readonly !disabled}]
    } {
	ttk::setCursor $w text
    } else {
	ttk::setCursor $w $State(userConfCursor)
    }
}

## TraverseIn -- receive focus due to keyboard navigation
#	For editable comboboxes, set the selection and insert cursor.
#
proc ttk::combobox::TraverseIn {w} {
    $w instate {!readonly !disabled} {
	$w selection range 0 end
	$w icursor end
    }
}

## SelectEntry $cb $index --
#	Set the combobox selection in response to a user action.
#
proc ttk::combobox::SelectEntry {cb index} {
    $cb current $index
    $cb selection range 0 end
    $cb icursor end
    event generate $cb <<ComboboxSelected>> -when mark
}

## Scroll -- Mousewheel binding
#
proc ttk::combobox::Scroll {cb dir} {
    $cb instate disabled { return }
    set max [llength [$cb cget -values]]
    set current [$cb current]
    incr current $dir
    if {$max != 0 && $current == $current % $max} {
	SelectEntry $cb $current
    }
}

## LBSelected $lb -- Activation binding for listbox
#	Set the combobox value to the currently-selected listbox value
#	and unpost the listbox.
#
proc ttk::combobox::LBSelected {lb} {
    set cb [LBMaster $lb]
    LBSelect $lb
    Unpost $cb
    focus $cb
}

## LBCancel --
#	Unpost the listbox.
#
proc ttk::combobox::LBCancel {lb} {
    Unpost [LBMaster $lb]
}

## LBTab -- Tab key binding for combobox listbox.
#	Set the selection, and navigate to next/prev widget.
#
proc ttk::combobox::LBTab {lb dir} {
    set cb [LBMaster $lb]
    switch -- $dir {
	next	{ set newFocus [tk_focusNext $cb] }
	prev	{ set newFocus [tk_focusPrev $cb] }
    }

    if {$newFocus ne ""} {
	LBSelect $lb
	Unpost $cb
	# The [grab release] call in [Unpost] queues events that later
	# re-set the focus (@@@ NOTE: this might not be true anymore).
	# Set new focus later:
	after 0 [list ttk::traverseTo $newFocus]
    }
}

## LBHover -- <Motion> binding for combobox listbox.
#	Follow selection on mouseover.
#
proc ttk::combobox::LBHover {w x y} {
    $w selection clear 0 end
    $w activate @$x,$y
    $w selection set @$x,$y
}

## MapPopdown -- <Map> binding for ComboboxPopdown
#
proc ttk::combobox::MapPopdown {w} {
    [winfo parent $w] state pressed
    ttk::globalGrab $w
}

## UnmapPopdown -- <Unmap> binding for ComboboxPopdown
#
proc ttk::combobox::UnmapPopdown {w} {
    [winfo parent $w] state !pressed
    ttk::releaseGrab $w
}

## PopdownWindow --
#	Returns the popdown widget associated with a combobox,
#	creating it if necessary.
#
proc ttk::combobox::PopdownWindow {cb} {
    if {![winfo exists $cb.popdown]} {
	set poplevel [PopdownToplevel $cb.popdown]
	set popdown [ttk::frame $poplevel.f -style ComboboxPopdownFrame]

	ttk::scrollbar $popdown.sb \
	    -orient vertical -command [list $popdown.l yview]
	listbox $popdown.l \
	    -listvariable ttk::combobox::Values($cb) \
	    -yscrollcommand [list $popdown.sb set] \
	    -exportselection false \
	    -selectmode browse \
	    -activestyle none \
	    ;

	bindtags $popdown.l \
	    [list $popdown.l ComboboxListbox Listbox $popdown all]

	grid $popdown.l -row 0 -column 0 -padx {1 0} -pady 1 -sticky nsew
        grid $popdown.sb -row 0 -column 1 -padx {0 1} -pady 1 -sticky ns
	grid columnconfigure $popdown 0 -weight 1
	grid rowconfigure $popdown 0 -weight 1

        grid $popdown -sticky news -padx 0 -pady 0
        grid rowconfigure $poplevel 0 -weight 1
        grid columnconfigure $poplevel 0 -weight 1
    }
    return $cb.popdown
}

## PopdownToplevel -- Create toplevel window for the combobox popdown
#
#	See also <<NOTE-WM-TRANSIENT>>
#
proc ttk::combobox::PopdownToplevel {w} {
    toplevel $w -class ComboboxPopdown
    wm withdraw $w
    switch -- [tk windowingsystem] {
	default -
	x11 {
	    $w configure -relief flat -borderwidth 0
	    wm attributes $w -type combo
	    wm overrideredirect $w true
	}
	win32 {
	    $w configure -relief flat -borderwidth 0
	    wm overrideredirect $w true
	    wm attributes $w -topmost 1
	}
	aqua {
	    $w configure -relief solid -borderwidth 0
	    tk::unsupported::MacWindowStyle style $w \
	    	help {noActivates hideOnSuspend}
	    wm resizable $w 0 0
	}
    }
    return $w
}

## ConfigureListbox --
#	Set listbox values, selection, height, and scrollbar visibility
#	from current combobox values.
#
proc ttk::combobox::ConfigureListbox {cb} {
    variable Values

    set popdown [PopdownWindow $cb].f
    set values [$cb cget -values]
    set current [$cb current]
    if {$current < 0} {
	set current 0 		;# no current entry, highlight first one
    }
    set Values($cb) $values
    $popdown.l selection clear 0 end
    $popdown.l selection set $current
    $popdown.l activate $current
    $popdown.l see $current
    set height [llength $values]
    if {$height > [$cb cget -height]} {
	set height [$cb cget -height]
    	grid $popdown.sb
        grid configure $popdown.l -padx {1 0}
    } else {
	grid remove $popdown.sb
        grid configure $popdown.l -padx 1
    }
    $popdown.l configure -height $height
}

## PlacePopdown --
#	Set popdown window geometry.
#
# @@@TODO: factor with menubutton::PostPosition
#
proc ttk::combobox::PlacePopdown {cb popdown} {
    set x [winfo rootx $cb]
    set y [winfo rooty $cb]
    set w [winfo width $cb]
    set h [winfo height $cb]
    set style [$cb cget -style]
    if { $style eq {} } {
      set style TCombobox
    }
    set postoffset [ttk::style lookup $style -postoffset {} {0 0 0 0}]
    foreach var {x y w h} delta $postoffset {
    	incr $var $delta
    }

    set H [winfo reqheight $popdown]
    if {$y + $h + $H > [winfo screenheight $popdown]} {
	set Y [expr {$y - $H}]
    } else {
	set Y [expr {$y + $h}]
    }
    wm geometry $popdown ${w}x${H}+${x}+${Y}
}

## Post $cb --
#	Pop down the associated listbox.
#
proc ttk::combobox::Post {cb} {
    # Don't do anything if disabled:
    #
    $cb instate disabled { return }

    # ASSERT: ![$cb instate pressed]

    # Run -postcommand callback:
    #
    uplevel #0 [$cb cget -postcommand]

    set popdown [PopdownWindow $cb]
    ConfigureListbox $cb
    update idletasks	;# needed for geometry propagation.
    PlacePopdown $cb $popdown
    # See <<NOTE-WM-TRANSIENT>>
    switch -- [tk windowingsystem] {
	x11 - win32 { wm transient $popdown [winfo toplevel $cb] }
    }

    # Post the listbox:
    #
    wm attribute $popdown -topmost 1
    wm deiconify $popdown
    raise $popdown
}

## Unpost $cb --
#	Unpost the listbox.
#
proc ttk::combobox::Unpost {cb} {
    if {[winfo exists $cb.popdown]} {
	wm withdraw $cb.popdown
    }
    grab release $cb.popdown ;# in case of stuck or unexpected grab [#1239190]
}

## LBMaster $lb --
#	Return the combobox main widget that owns the listbox.
#
proc ttk::combobox::LBMaster {lb} {
    winfo parent [winfo parent [winfo parent $lb]]
}

## LBSelect $lb --
#	Transfer listbox selection to combobox value.
#
proc ttk::combobox::LBSelect {lb} {
    set cb [LBMaster $lb]
    set selection [$lb curselection]
    if {[llength $selection] == 1} {
	SelectEntry $cb [lindex $selection 0]
    }
}

## LBCleanup $lb --
#	<Destroy> binding for combobox listboxes.
#	Cleans up by unsetting the linked textvariable.
#
#	Note: we can't just use { unset [%W cget -listvariable] }
#	because the widget command is already gone when this binding fires).
#	[winfo parent] still works, fortunately.
#
proc ttk::combobox::LBCleanup {lb} {
    variable Values
    unset Values([LBMaster $lb])
}

#*EOF*