XtCreateWidget man page on Ultrix

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XtCreateWidget(3Xt)		     X11R5		   XtCreateWidget(3Xt)

NAME
       XtCreateWidget, XtCreateManagedWidget, XtDestroyWidget - create and
       destroy widgets

SYNTAX
       Widget XtCreateWidget(name, widget_class, parent, args, num_args)
	     String name;
	     WidgetClass widget_class;
	     Widget parent;
	     ArgList args;
	     Cardinal num_args;

       Widget XtCreateManagedWidget(name, widget_class, parent, args,
       num_args)
	     String name;
	     WidgetClass widget_class;
	     Widget parent;
	     ArgList args;
	     Cardinal num_args;

       void XtDestroyWidget(w)
	     Widget w;

ARGUMENTS
       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.

DESCRIPTION
       The function performs much of the boilerplate operations of widget cre‐
       ation:

       ·    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 it allocates memory for the par‐
	    ent'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 super‐
	    classes.

       ·    If the parent is a subclass of 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

       ·    Calls the initialize procedures for the widget by starting at the
	    initialize procedure on down to the widget's initialize procedure.

       ·    If the parent is a subclass of it puts the widget into its par‐
	    ent's children list by calling its parent's insert_child proce‐
	    dure.  For further information, see Section 3.5.

       ·    If the parent is a subclass of it calls the constraint initialize
	    procedures, starting at on down to the parent's constraint ini‐
	    tialize procedure.

       Note that you can determine the number of arguments in an argument list
       by using the macro.  For further information, see Section 11.1.

       The function is a convenience routine that calls and

       The 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, performs the following:

       ·    If the being_destroyed field of the widget is it returns immedi‐
	    ately.

       ·    Recursively descends the widget tree and sets the being_destroyed
	    field to 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 is about to return or immediately if not in

       In phase two, 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 and if the parent is not
	    being destroyed, it calls on the widget and then calls the wid‐
	    get's parent's delete_child procedure (see Section 3.4).

       ·    If the widget's parent is a subclass of it calls the constraint
	    destroy procedure for the parent, then the parent's superclass,
	    until finally it calls the constraint destroy procedure for

       ·    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 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 sub‐
	    class of children.

SEE ALSO
       XtAppCreateShell(3Xt), XtCreatePopupShell(3Xt)
       X Toolkit Intrinsics - C Language Interface
       Xlib - C Language X Interface

							   XtCreateWidget(3Xt)
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