X11R7.4 - man page for xtaddgrab (x11r4 section 3)
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XtAddGrab(3) XT FUNCTIONS XtAddGrab(3)
XtAddGrab, XtRemoveGrab - redirect user input to a modal widget
void XtAddGrab(Widget w, Boolean exclusive, Boolean spring_loaded);
void XtRemoveGrab(Widget w);
exclusive 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
w Specifies the widget to add to or remove from the modal cascade.
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, XtAdd-
Grab 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 parame-
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 usu-
ally 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 starting at the most
recent widget up to and including the specified widget. It issues an error if the speci-
fied widget is not on the modal cascade.
X Toolkit Intrinsics - C Language Interface
Xlib - C Language X Interface
X Version 11 libXt 1.0.5 XtAddGrab(3)
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