xmtrackingevent(3x) [osf1 man page]

XmTrackingEvent(3X)													       XmTrackingEvent(3X)

NAME

       XmTrackingEvent - A Toolkit function that provides a modal interaction

SYNOPSIS

       #include <Xm/Xm.h>

       Widget XmTrackingEvent (widget, cursor, confine_to, event_return)
	       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 grabs the
       pointer and discards succeeding events until BSelect is released or a key is pressed and then released. The function then returns the  wid-
       get  or	gadget that contains the pointer when BSelect is released or a key is released.  Specifies the widget ID of a widget to use as the
       basis of the modal interaction.	That is, the widget within which the interaction must occur, usually a top  level  shell.   Specifies  the
       cursor  to be used for the pointer during the interaction. This is a standard X cursor name.  Specifies whether or not the cursor should be
       confined to widget.  Returns the ButtonRelease or KeyRelease event that causes the function to return.

RETURN VALUE

       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.

SEE ALSO

       XmTrackingLocate(3X)

															       XmTrackingEvent(3X)

XtAddGrab(3)							   XT FUNCTIONS 						      XtAddGrab(3)

NAME

       XtAddGrab, XtRemoveGrab - redirect user input to a modal widget

SYNTAX

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

       void XtRemoveGrab(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 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 cas-
       cade 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

X Version 11							    libXt 1.1.3 						      XtAddGrab(3)