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Constraint initialize()				       Constraint initialize()

  Constraint initialize	 -  Constraint class method to initialize a child
  object or widget's constraint record.

  typedef void (*XtInitProc)(Widget, Widget, ArgList, Cardinal *);
	 Widget request;
	 Widget init;
	 ArgList args;
	 Cardinal *num_args;

  request   Specifies the newly created child widget or	 object	 instance
	    with  its  constraint record resource values set as requested
	    by the argument list, the resource	database,  and	the  con‐
	    straint defaults.

  init	    Specifies  the  same  widget  or  object  with its constraint
	    record fields as modified by any superclass	 Constraint  ini‐
	    tialize() methods.

  args	    Specifies  the  argument list that was passed to XtCreateWid‐

  num_args  Specifies the number of entries in the argument list.

  The Constraint initialize() method  is  registered  on  the  initialize
  field	 of  the Constraint class part structure, and is called by XtCre‐
  ateWidget() when a child of the constraint widget is created.	 The Con‐
  straint  initialize()	 method performs the same sort of initializations
  on the constraint record of a widget that the normal (Object,	 RectObj,
  or Core) initialize() method performs on the widget instance structure.

  The  request	and init arguments specify the child widget that is being
  created.  The constraints field of the request widget points to a  copy
  of  the  constraint  record  as  it  was  after  all	of the constraint
  resources were initialized from the argument list, the  resource  data‐
  base, or the resource list defaults.	The constraints field of the init
  widget points to the actual constraints record of the widget,	 and  has
  been	further	 initialized by the Constraint initialize() method of any
  Constraint superclasses of the parent widget.	 All modifications should
  be  made to the init constraints record; the request argument exists so
  that the widget class can determine  which  field  of	 the  constraints
  record  have	been modified by superclass Constraint initialize() meth‐

  The Constraint initialize() method is chained in superclass-to-subclass
  order, and cannot be inherited.  If nothing in the constraint structure
  needs initialization, the Constraint class part initialize field should
  be NULL.

  The args and num_args arguments were added to this method in Release 4.

  See  initialize(4)  for an explanation of the things that an initialize
  procedure should do.	See XtCreateWidget(1) for  full	 details  of  the
  widget creation process.

  The following procedure is the Constraint initialize() method, slightly
  modified, of the Athena Form widget class.  Note  how	 it  obtains  the
  constraint  record  and  the parent form widget from the supplied child
  widget.  Note also that it provides "dynamic defaults" for two  of  its
  constraint resources: if dx or dy is equal to some default value (i.e.,
  if it was not explicitly specified), then it will be	replaced  by  the
  value of the XtNdefaultSpacing resource from the Form widget itself.

  Note	that  this  procedure  (and most other initialize() procedures in
  existence) has named its init argument new.  "new" is a  reserved  word
  in  C++,  and your programs will be more portable if you avoid using it
  in your C code.

     /* ARGSUSED */
     static void ConstraintInitialize(request, new, args, num_args)
	 Widget request, new;
	 ArgList args;
	 Cardinal *num_args;
	 FormConstraints form = (FormConstraints)new->core.constraints;
	 FormWidget fw = (FormWidget)new->core.parent;

	 form->form.virtual_width = (int) new->core.width;
	 form->form.virtual_height = (int) new->core.height;

	 if (form->form.dx == default_value)
	     form->form.dx = fw->form.default_spacing;

	 if (form->form.dy == default_value)
	     form->form.dy = fw->form.default_spacing;

	 form->form.deferred_resize = False;

See Also
  Constraint(3), Core(3),
  Constraint destroy(4), initialize(4), Constraint set_values(4).

Xt - Intrinsics Methods				       Constraint initialize()

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