xmtrackingevent(3) [hpux man page]
XmTrackingEvent(library call) XmTrackingEvent(library call) NAME
XmTrackingEvent -- A Toolkit function that provides a modal interaction SYNOPSIS
#include <Xm/Xm.h> Widget XmTrackingEvent( Widget widget, Cursor cursor, Boolean confine_to, XEvent *event_return); DESCRIPTION
XmTrackingEvent provides a modal interface for selection of a component. It is intended to support context help. The function calls the XmUpdateDisplay function. XmTrackingEvent then grabs the pointer and discards succeeding events until BSelect is released or a key is pressed and then released. The function then returns the widget or gadget that contains the pointer when BSelect is released or a key is released, and ungrabs the pointer. widget Specifies the widget ID of a widget to use as the basis of the modal interaction. That is, the widget within which the interac- tion must occur, usually a top-level shell. cursor Specifies the cursor to be used for the pointer during the interaction. This is a standard X cursor name. confine_to Specifies whether or not the cursor should be confined to widget. event_return Returns the ButtonRelease or KeyRelease event that causes the function to return. RETURN
Returns the widget or gadget that contains the pointer when BSelect is released or a key is released. If no widget or gadget contains the pointer, the function returns NULL. RELATED
XmTrackingLocate(3). XmTrackingEvent(library call)
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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)