XtAddGrab(3Xt)							     MIT X11R4							    XtAddGrab(3Xt)

Name
       XtAddGrab, XtRemoveGrab - redirect user input to a modal widget

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

       void XtRemoveGrab(w)
	  Widget w;

Arguments
       exclusive Specifies whether user events should be dispatched exclusively to this widget or also to previous widgets in the cascade.

       spring_loaded
		 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 cascade.

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

       The modal cascade is used by when it tries to dispatch a user event.  When at least one modal widget is in the widget cascade, first deter-
       mines 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

       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 submenus generally add a submenu widget to the cascade with exclusive
       Modal dialog boxes that need to restrict user input to the most deeply nested dialog box add a subdialog widget to the cascade with exclu-
       sive User events that occur within the active subset are delivered to the appropriate widget, which is usually a child or further descen-
       dant 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 cas-
       cade that has spring_loaded if any such widget exists.

       The function removes widgets from the modal cascade starting 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.

See Also
       X Window System Toolkit: The Complete Programmer's Guide and Specification, Paul J. Asente and Ralph Swick
       X Window System: The Complete Reference, Second Edition, Robert W. Scheifler and James Gettys

																    XtAddGrab(3Xt)