309 lines
8.7 KiB
Groff
309 lines
8.7 KiB
Groff
.\" 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
|