XtAddGrab(3Xt)															    XtAddGrab(3Xt)

NAME

       XtAddGrab, XtRemoveGrab - redirect user input to a modal widget

SYNOPSIS

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

       void XtRemoveGrab(w)
	       Widget w;

ARGUMENTS

       Specifies  whether  user  events  should  be  dispatched  exclusively to this widget or also to previous widgets in the cascade.  Specifies
       whether this widget was popped up because the user pressed a pointer button.  Specifies the widget to add to or remove from the modal  cas-
       cade.

DESCRIPTION

       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  cas-
       cade, 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 submenus 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
       exclusive  True.  User events that occur within the active subset are delivered to the appropriate widget, which is usually a child or fur-
       ther 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  cas-
       cade that has spring_loaded True, if any such widget exists.

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

SEE ALSO

       X Toolkit Intrinsics -- C Language Interface

       Xlib -- C Language X Interface

																    XtAddGrab(3Xt)