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XtCreateWidget(3Xt) manual page
Table of Contents
XtCreateWidget, XtVaCreateWidget, XtCreateManagedWidget,
XtVaCreateManagedWidget, XtDestroyWidget - create and destroy widgets
Widget
XtCreateWidget(name, widget_class, parent, XtDestroyWidget - create and
destroy widgets args, num_args)
String name;
WidgetClass widget_class;
Widget parent;
ArgList args;
Cardinal num_args;
Widget XtVaCreateWidget(name, widget_class, parent, ...)
String name;
WidgetClass widget_class;
Widget parent;
Widget XtCreateManagedWidget(name, widget_class, parent, XtDestroyWidget
- create and destroy widgets args, num_args)
String name;
WidgetClass widget_class;
Widget parent;
ArgList args;
Cardinal num_args;
Widget XtVaCreateManagedWidget(name, widget_class, parent, ...)
String name;
WidgetClass widget_class;
Widget parent;
void XtDestroyWidget(w)
Widget w;
- args
- Specifies the argument list to override the resource defaults.
- name
- 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.
- num_args
- Specifies the number
of arguments in the argument list.
- parent
- Specifies the parent widget.
- w
- Specifies
the widget.
- widget_class
- Specifies the widget class pointer for the created
widget.
- ...
- Specifies the variable argument list to override the resource defaults.
The XtCreateWidget function performs much of the boilerplate
operations of widget creation:
·- 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.
·- Allocates memory for the
widget instance.
·- If the parent is a subclass of constraintWidgetClass,
it allocates memory for the parent's constraints and stores the address
of this memory into the constraints field.
·- Initializes the core nonresource
data fields (for example, parent and visible).
·- Initializes the resource
fields (for example, background_pixel) by using the resource lists specified
for this class and all superclasses.
·- If the parent is a subclass of 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 constraintWidgetClass.
·- Calls the initialize procedures for the widget
by starting at the Core initialize procedure on down to the widget's
initialize procedure.
·- If the parent is a subclass of 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.
·- If the parent
is a subclass of constraintWidgetClass, it calls the constraint initialize
procedures, starting at constraintWidgetClass on down to the parent's
constraint initialize procedure.
Note that you can determine the number
of arguments in an argument list by using the XtNumber macro. For further
information, see Section 11.1.
The XtCreateManagedWidget function is a
convenience routine that calls XtCreateWidget and XtManageChild.
The
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.
In phase one, XtDestroyWidget performs
the following:
·- If the being_destroyed field of the widget is True, it
returns immediately.
·- Recursively descends the widget tree and sets the being_destroyed
field to True for the widget and all children.
·- Adds the widget to a list
of widgets (the destroy list) that should be destroyed when it is safe
to do so.
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.)
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 XtDispatchEvent is about to return
or immediately if not in XtDispatchEvent.
In phase two, XtDestroyWidget
performs the following on each entry in the destroy list:
·- Calls the destroy
callback procedures registered on the widget (and all descendants) in
post-order (it calls children callbacks before parent callbacks).
·- If the
widget's parent is a subclass of compositeWidgetClass and if the parent
is not being destroyed, it calls XtUnmanageChild on the widget and
then calls the widget's parent's delete_child procedure (see Section 3.4).
·- If the widget's parent is a subclass of constraintWidgetClass, it calls
the constraint destroy procedure for the parent, then the parent's superclass,
until finally it calls the constraint destroy procedure for constraintWidgetClass.
·- 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.
·- Calls
XDestroyWindow if the widget is realized (that is, has an X window). The
server recursively destroys all descendant windows.
·- Recursively descends
the tree and deallocates all pop-up widgets, constraint records, callback
lists and, if the widget is a subclass of compositeWidgetClass, children.
XtAppCreateShell(3Xt)
, XtCreatePopupShell(3Xt)
X Toolkit Intrinsics - C Language Interface
Xlib - C Language X Interface
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- an
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- arc
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- az
- ba
- bar
- bat_smg
- bcl
- be
- be_x_old
- bg
- bh
- bi
- bm
- bn
- bo
- bpy
- br
- bs
- bug
- bxr
- ca
- cbk_zam
- cdo
- ce
- ceb
- ch
- cho
- chr
- chy
- co
- cr
- crh
- cs
- csb
- cu
- cv
- cy
- da
- de
- diq
- dsb
- dv
- dz
- ee
- el
- eml
- en
- eo
- es
- et
- eu
- ext
- fa
- ff
- fi
- fiu_vro
- fj
- fo
- fr
- frp
- fur
- fy
- ga
- gan
- gd
- gl
- glk
- gn
- got
- gu
- gv
- ha
- hak
- haw
- he
- hi
- hif
- ho
- hr
- hsb
- ht
- hu
- hy
- hz
- ia
- id
- ie
- ig
- ii
- ik
- ilo
- io
- is
- it
- iu
- ja
- jbo
- jv
- ka
- kaa
- kab
- kg
- ki
- kj
- kk
- kl
- km
- kn
- ko
- kr
- ks
- ksh
- ku
- kv
- kw
- ky
- la
- lad
- lb
- lbe
- lg
- li
- lij
- lmo
- ln
- lo
- lt
- lv
- map_bms
- mdf
- mg
- mh
- mi
- mk
- ml
- mn
- mo
- mr
- mt
- mus
- my
- myv
- mzn
- na
- nah
- nap
- nds
- nds_nl
- ne
- new
- ng
- nl
- nn
- no
- nov
- nrm
- nv
- ny
- oc
- om
- or
- os
- pa
- pag
- pam
- pap
- pdc
- pi
- pih
- pl
- pms
- ps
- pt
- qu
- quality
- rm
- rmy
- rn
- ro
- roa_rup
- roa_tara
- ru
- rw
- sa
- sah
- sc
- scn
- sco
- sd
- se
- sg
- sh
- si
- simple
- sk
- sl
- sm
- sn
- so
- sr
- srn
- ss
- st
- stq
- su
- sv
- sw
- szl
- ta
- te
- tet
- tg
- th
- ti
- tk
- tl
- tlh
- tn
- to
- tpi
- tr
- ts
- tt
- tum
- tw
- ty
- udm
- ug
- uk
- ur
- uz
- ve
- vec
- vi
- vls
- vo
- wa
- war
- wo
- wuu
- xal
- xh
- yi
- yo
- za
- zea
- zh
- zh_classical
- zh_min_nan
- zh_yue
- zu
-
Static
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- ab
- af
- ak
- als
- am
- an
- ang
- ar
- arc
- as
- ast
- av
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- az
- ba
- bar
- bat_smg
- bcl
- be
- be_x_old
- bg
- bh
- bi
- bm
- bn
- bo
- bpy
- br
- bs
- bug
- bxr
- ca
- cbk_zam
- cdo
- ce
- ceb
- ch
- cho
- chr
- chy
- co
- cr
- crh
- cs
- csb
- cu
- cv
- cy
- da
- de
- diq
- dsb
- dv
- dz
- ee
- el
- eml
- eo
- es
- et
- eu
- ext
- fa
- ff
- fi
- fiu_vro
- fj
- fo
- fr
- frp
- fur
- fy
- ga
- gan
- gd
- gl
- glk
- gn
- got
- gu
- gv
- ha
- hak
- haw
- he
- hi
- hif
- ho
- hr
- hsb
- ht
- hu
- hy
- hz
- ia
- id
- ie
- ig
- ii
- ik
- ilo
- io
- is
- it
- iu
- ja
- jbo
- jv
- ka
- kaa
- kab
- kg
- ki
- kj
- kk
- kl
- km
- kn
- ko
- kr
- ks
- ksh
- ku
- kv
- kw
- ky
- la
- lad
- lb
- lbe
- lg
- li
- lij
- lmo
- ln
- lo
- lt
- lv
- map_bms
- mdf
- mg
- mh
- mi
- mk
- ml
- mn
- mo
- mr
- mt
- mus
- my
- myv
- mzn
- na
- nah
- nap
- nds
- nds_nl
- ne
- new
- ng
- nl
- nn
- no
- nov
- nrm
- nv
- ny
- oc
- om
- or
- os
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- pag
- pam
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- pdc
- pi
- pih
- pl
- pms
- ps
- pt
- qu
- quality
- rm
- rmy
- rn
- ro
- roa_rup
- roa_tara
- ru
- rw
- sa
- sah
- sc
- scn
- sco
- sd
- se
- sg
- sh
- si
- simple
- sk
- sl
- sm
- sn
- so
- sr
- srn
- ss
- st
- stq
- su
- sv
- sw
- szl
- ta
- te
- tet
- tg
- th
- ti
- tk
- tl
- tlh
- tn
- to
- tpi
- tr
- ts
- tt
- tum
- tw
- ty
- udm
- ug
- uk
- ur
- uz
- ve
- vec
- vi
- vls
- vo
- wa
- war
- wo
- wuu
- xal
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