aboutsummaryrefslogtreecommitdiff
path: root/libXt/man/XtCreateWidget.man
blob: 32d33eda7f52898fc76c0fb13a5267827ba64f74 (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
.\" Copyright 1993 X Consortium
.\"
.\" Permission is hereby granted, free of charge, to any person obtaining
.\" a copy of this software and associated documentation files (the
.\" "Software"), to deal in the Software without restriction, including
.\" without limitation the rights to use, copy, modify, merge, publish,
.\" distribute, sublicense, and/or sell copies of the Software, and to
.\" permit persons to whom the Software is furnished to do so, subject to
.\" the following conditions:
.\"
.\" The above copyright notice and this permission notice shall be
.\" included in all copies or substantial portions of the Software.
.\"
.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
.\" EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
.\" IN NO EVENT SHALL THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR
.\" OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
.\" ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
.\" OTHER DEALINGS IN THE SOFTWARE.
.\"
.\" Except as contained in this notice, the name of the X Consortium shall
.\" not be used in advertising or otherwise to promote the sale, use or
.\" other dealings in this Software without prior written authorization
.\" from the X Consortium.
.\"
.ds tk X Toolkit
.ds xT X Toolkit Intrinsics \- C Language Interface
.ds xI Intrinsics
.ds xW X Toolkit Athena Widgets \- C Language Interface
.ds xL Xlib \- C Language X Interface
.ds xC Inter-Client Communication Conventions Manual
.ds Rn 3
.ds Vn 2.2
.hw XtCreate-Widget XtCreate-Managed-Widget XtDestroy-Widget XtVa-Create-Widget XtVa-Create-Managed-Widget wid-get
.na
.de Ds
.nf
.\\$1D \\$2 \\$1
.ft 1
.ps \\n(PS
.\".if \\n(VS>=40 .vs \\n(VSu
.\".if \\n(VS<=39 .vs \\n(VSp
..
.de De
.ce 0
.if \\n(BD .DF
.nr BD 0
.in \\n(OIu
.if \\n(TM .ls 2
.sp \\n(DDu
.fi
..
.de FD
.LP
.KS
.TA .5i 3i
.ta .5i 3i
.nf
..
.de FN
.fi
.KE
.LP
..
.de IN		\" send an index entry to the stderr
..
.de C{
.KS
.nf
.D
.\"
.\"	choose appropriate monospace font
.\"	the imagen conditional, 480,
.\"	may be changed to L if LB is too
.\"	heavy for your eyes...
.\"
.ie "\\*(.T"480" .ft L
.el .ie "\\*(.T"300" .ft L
.el .ie "\\*(.T"202" .ft PO
.el .ie "\\*(.T"aps" .ft CW
.el .ft R
.ps \\n(PS
.ie \\n(VS>40 .vs \\n(VSu
.el .vs \\n(VSp
..
.de C}
.DE
.R
..
.de Pn
.ie t \\$1\fB\^\\$2\^\fR\\$3
.el \\$1\fI\^\\$2\^\fP\\$3
..
.de ZN
.ie t \fB\^\\$1\^\fR\\$2
.el \fI\^\\$1\^\fP\\$2
..
.de NT
.ne 7
.ds NO Note
.if \\n(.$>$1 .if !'\\$2'C' .ds NO \\$2
.if \\n(.$ .if !'\\$1'C' .ds NO \\$1
.ie n .sp
.el .sp 10p
.TB
.ce
\\*(NO
.ie n .sp
.el .sp 5p
.if '\\$1'C' .ce 99
.if '\\$2'C' .ce 99
.in +5n
.ll -5n
.R
..
.		\" Note End -- doug kraft 3/85
.de NE
.ce 0
.in -5n
.ll +5n
.ie n .sp
.el .sp 10p
..
.ny0
.TH XtCreateWidget __libmansuffix__ __xorgversion__ "XT FUNCTIONS"
.SH NAME
XtCreateWidget, XtVaCreateWidget, XtCreateManagedWidget, XtVaCreateManagedWidget, XtDestroyWidget \- create and destroy widgets
.SH SYNTAX
.HP
Widget XtCreateWidget(String \fIname\fP, WidgetClass \fIwidget_class\fP,
Widget \fIparent\fP, ArgList \fIargs\fP, Cardinal \fInum_args\fP); 
.HP
Widget XtVaCreateWidget(String \fIname\fP, WidgetClass \fIwidget_class\fP,
Widget \fIparent\fP, ...\^);
.HP
Widget XtCreateManagedWidget(String \fIname\fP, WidgetClass
\fIwidget_class\fP, Widget \fIparent\fP, ArgList \fIargs\fP, Cardinal
\fInum_args\fP); 
.HP
Widget XtVaCreateManagedWidget(String \fIname\fP, WidgetClass
\fIwidget_class\fP, Widget \fIparent\fP, ...\^);
.HP
void XtDestroyWidget(Widget \fIw\fP); 
.SH ARGUMENTS
.ds Al to override the resource defaults
.IP \fIargs\fP 1i
Specifies the argument list \*(Al.
.IP \fIname\fP 1i
Specifies the resource name for the created widget,
which is used for retrieving resources
and, for that reason, should not be the same as any other widget
that is a child of same parent.
.IP \fInum_args\fP 1i
Specifies the number of arguments in the argument list.
.IP \fIparent\fP 1i
Specifies the parent widget.
.IP \fIw\fP 1i
Specifies the widget.
.ds Wc \ pointer for the created widget
.IP \fIwidget_class\fP 1i
Specifies the widget class\*(Wc.
.IP \fI...\fP
Specifies the variable argument list \*(Al.
.SH DESCRIPTION
The
.ZN XtCreateWidget
function performs much of the boilerplate operations of widget creation:
.IP \(bu 5
Checks to see if the class_initialize procedure has been called for this class
and for all superclasses and, if not, calls those necessary in a
superclass-to-subclass order.
.IP \(bu 5
Allocates memory for the widget instance.
.IP \(bu 5
If the parent is a subclass of
.ZN constraintWidgetClass ,
it allocates memory for the parent's constraints
and stores the address of this memory into the constraints field.
.IP \(bu 5
Initializes the core nonresource data fields
(for example, parent and visible).
.IP \(bu 5
Initializes the resource fields (for example, background_pixel)
by using the resource lists specified for this class and all superclasses.
.IP \(bu 5
If the parent is a subclass of
.ZN constraintWidgetClass ,
it initializes the resource fields of the constraints record
by using the constraint resource list specified for the parent's class
and all superclasses up to
.ZN constraintWidgetClass .
.IP \(bu 5
Calls the initialize procedures for the widget by starting at the 
.ZN Core
initialize procedure on down to the widget's initialize procedure.
.IP \(bu 5
If the parent is a subclass of
.ZN compositeWidgetClass ,
it puts the widget into its parent's children list by calling its parent's
insert_child procedure.
For further information,
see Section 3.5.
.IP \(bu 5
If the parent is a subclass of
.ZN constraintWidgetClass ,
it calls the constraint initialize procedures,
starting at
.ZN constraintWidgetClass
on down to the parent's constraint initialize procedure.
.LP
Note that you can determine the number of arguments in an argument list 
by using the
.ZN  XtNumber
macro.
For further information, see Section 11.1.
.LP
The
.ZN XtCreateManagedWidget
function is a convenience routine that calls
.ZN XtCreateWidget
and
.ZN XtManageChild .
.LP
The
.ZN XtDestroyWidget
function provides the only method of destroying a widget,
including widgets that need to destroy themselves.
It can be called at any time,
including from an application callback routine of the widget being destroyed.
This requires a two-phase destroy process in order to avoid dangling
references to destroyed widgets.
.LP
In phase one,
.ZN XtDestroyWidget
performs the following:
.IP \(bu 5
If the being_destroyed field of the widget is 
.ZN True ,
it returns immediately.
.IP \(bu 5
Recursively descends the widget tree and
sets the being_destroyed field to 
.ZN True 
for the widget and all children.
.IP \(bu 5
Adds the widget to a list of widgets (the destroy list) that should be
destroyed when it is safe to do so.
.LP
Entries on the destroy list satisfy the invariant that
if w2 occurs after w1 on the destroy list then w2 is not a descendent of w1.
(A descendant refers to both normal and pop-up children.)
.LP
Phase two occurs when all procedures that should execute as a result of
the current event have been called (including all procedures registered with
the event and translation managers),
that is, when the current invocation of
.ZN XtDispatchEvent
is about to return or immediately if not in
.ZN XtDispatchEvent .
.LP
In phase two,
.ZN XtDestroyWidget
performs the following on each entry in the destroy list:
.IP \(bu 5
Calls the destroy callback procedures registered on the widget 
(and all descendants) in post-order (it calls children callbacks 
before parent callbacks).
.IP \(bu 5
If the widget's parent is a subclass of 
.ZN compositeWidgetClass 
and if the parent is not being destroyed, 
it calls 
.ZN XtUnmanageChild 
on the widget and then calls the widget's parent's delete_child procedure
(see Section 3.4).
.IP \(bu 5
If the widget's parent is a subclass of
.ZN constraintWidgetClass ,
it calls the constraint destroy procedure for the parent,
then the parent's superclass,
until finally it calls the constraint destroy procedure for
.ZN constraintWidgetClass .
.IP \(bu 5
Calls the destroy methods for the widget (and all descendants)
in post-order.
For each such widget,
it calls the destroy procedure declared in the widget class,
then the destroy procedure declared in its superclass,
until finally it calls the destroy procedure declared in the Core
class record.
.IP \(bu 5
Calls
.ZN XDestroyWindow
if the widget is realized (that is, has an X window).
The server recursively destroys all descendant windows.
.IP \(bu 5
Recursively descends the tree and deallocates all pop-up widgets, constraint
records, callback lists and, if the widget is a subclass of 
.ZN compositeWidgetClass , 
children.
.SH "SEE ALSO"
XtAppCreateShell(__libmansuffix__),
XtCreatePopupShell(__libmansuffix__)
.br
\fI\*(xT\fP
.br
\fI\*(xL\fP