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XtAddGrab(3)			 XT FUNCTIONS			  XtAddGrab(3)

       XtAddGrab, XtRemoveGrab - redirect user input to	a modal	widget

       #include	<X11/Intrinsic.h>

       void XtAddGrab(Widget w,	Boolean	exclusive, Boolean spring_loaded);

       void XtRemoveGrab(Widget	w);

       exclusive Specifies whether user	events should be dispatched exclu-
		 sively	to this	widget or also to previous widgets in the cas-

		 Specifies whether this	widget was popped up because the user
		 pressed a pointer button.

       w	 Specifies the widget to add to	or remove from the modal cas-

       The XtAddGrab function appends the widget (and associated parameters)
       to the modal cascade and	checks that exclusive is True if spring_loaded
       is True.	 If these are not True,	XtAddGrab generates an error.

       The modal cascade is used by XtDispatchEvent when it tries to dispatch
       a user event.  When at least one	modal widget is	in the widget cascade,
       XtDispatchEvent first determines	if the event should be delivered.  It
       starts at the most recent cascade entry and follows the cascade up to
       and including the most recent cascade entry added with the exclusive
       parameter True.

       This subset of the modal	cascade	along with all descendants of these
       widgets comprise	the active subset.  User events	that occur outside the
       widgets in this subset are ignored or remapped.	Modal menus with sub-
       menus generally add a submenu widget to the cascade with	exclusive
       False.  Modal dialog boxes that need to restrict	user input to the most
       deeply nested dialog box	add a subdialog	widget to the cascade with ex-
       clusive True.  User events that occur within the	active subset are de-
       livered to the appropriate widget, which	is usually a child or further
       descendant of the modal widget.

       Regardless of where on the screen they occur, remap events are always
       delivered to the	most recent widget in the active subset	of the cascade
       that has	spring_loaded True, if any such	widget exists.

       The XtRemoveGrab	function removes widgets from the modal	cascade	start-
       ing at the most recent widget up	to and including the specified widget.
       It issues an error if the specified widget is not on the	modal cascade.

       X Toolkit Intrinsics - C	Language Interface
       Xlib - C	Language X Interface

X Version 11			  libXt	1.2.0			  XtAddGrab(3)


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