XGrabButton(3X11)                    SysV                    XGrabButton(3X11)



NAME
     XGrabButton, XUngrabButton - grab pointer buttons

SYNTAX
     XGrabButton(display, button, modifiers, grab_window, owner_events,
     event_mask,
                     pointer_mode, keyboard_mode, confine_to, cursor)
           Display *display;
           unsigned int button;
           unsigned int modifiers;
           Window grab_window;
           Bool owner_events;
           unsigned int event_mask;
           int pointer_mode, keyboard_mode;
           Window confine_to;
           Cursor cursor;

     XUngrabButton(display, button, modifiers, grab_window)
           Display *display;
           unsigned int button;
           unsigned int modifiers;
           Window grab_window;

ARGUMENTS
     button    Specifies the pointer button that is to be grabbed or released
               or AnyButton.

     confine_to
               Specifies the window to confine the pointer in or None.

     cursor    Specifies the cursor that is to be displayed or None.

     display   Specifies the connection to the X server.

     event_mask
               Specifies which pointer events are reported to the client.  The
               mask is the bitwise inclusive OR of the valid pointer event
               mask bits.

     grab_window
               Specifies the grab window.

     keyboard_mode
               Specifies further processing of keyboard events.  You can pass
               GrabModeSync or GrabModeAsync.

     modifiers Specifies the set of keymasks or AnyModifier.  The mask is the
               bitwise inclusive OR of the valid keymask bits.

     owner_events
               Specifies a Boolean value that indicates whether the pointer
               events are to be reported as usual or reported with respect to
               the grab window if selected by the event mask.

     pointer_mode
               Specifies further processing of pointer events.  You can pass
               GrabModeSync or GrabModeAsync.

DESCRIPTION
     The XGrabButton function establishes a passive grab.  In the future, the
     pointer is actively grabbed (as for XGrabPointer), the last-pointer-grab

     time is set to the time at which the button was pressed (as transmitted
     in the ButtonPress event), and the ButtonPress event is reported if all
     of the following conditions are true:

     ⊕    The pointer is not grabbed, and the specified button is logically
          pressed when the specified modifier keys are logically down, and no
          other buttons or modifier keys are logically down.

     ⊕    The grab_window contains the pointer.

     ⊕    The confine_to window (if any) is viewable.

     ⊕    A passive grab on the same button/key combination does not exist on
          any ancestor of grab_window.

     The interpretation of the remaining arguments is as for XGrabPointer.
     The active grab is terminated automatically when the logical state of the
     pointer has all buttons released (independent of the state of the logical
     modifier keys).

     Note that the logical state of a device (as seen by client applications)
     may lag the physical state if device event processing is frozen.

     This request overrides all previous grabs by the same client on the same
     button/key combinations on the same window.  A modifiers of AnyModifier
     is equivalent to issuing the grab request for all possible modifier
     combinations (including the combination of no modifiers). It is not
     required that all modifiers specified have currently assigned KeyCodes.
     A button of AnyButton is equivalent to issuing the request for all
     possible buttons.  Otherwise, it is not required that the specified
     button currently be assigned to a physical button.

     If some other client has already issued a XGrabButton with the same
     button/key combination on the same window, a BadAccess error results.
     When using AnyModifier or AnyButton, the request fails completely, and a
     BadAccess error results (no grabs are established) if there is a
     conflicting grab for any combination.  XGrabButton has no effect on an
     active grab.

     XGrabButton can generate BadCursor, BadValue, and BadWindow errors.

     The XUngrabButton function releases the passive button/key combination on
     the specified window if it was grabbed by this client.  A modifiers of
     AnyModifier is equivalent to issuing the ungrab request for all possible
     modifier combinations, including the combination of no modifiers.  A
     button of AnyButton is equivalent to issuing the request for all possible
     buttons.  XUngrabButton has no effect on an active grab.

     XUngrabButton can generate BadValue and BadWindow errors.

DIAGNOSTICS
     BadCursor A value for a Cursor argument does not name a defined Cursor.

     BadValue  Some numeric value falls outside the range of values accepted
               by the request.  Unless a specific range is specified for an
               argument, the full range defined by the argument's type is
               accepted.  Any argument defined as a set of alternatives can
               generate this error.

     BadWindow A value for a Window argument does not name a defined Window.

SEE ALSO
     XAllowEvents(3X11), XGrabPointer(3X11), XGrabKey(3X11),
     XGrabKeyboard(3X11),
     Xlib - C Language X Interface