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XGRABDEVICEBUTTON(3)							     XGRABDEVICEBUTTON(3)

NAME
       XGrabDeviceButton, XUngrabDeviceButton - grab/ungrab extension input device buttons

SYNOPSIS
       #include <X11/extensions/XInput.h>

       int XGrabDeviceButton( Display *display,
			      XDevice *device,
			      unsigned int button,
			      unsigned int modifiers,
			      XDevice* modifier_device,
			      Window grab_window,
			      Bool owner_events,
			      unsigned int event_count,
			      XEventClass *event_list,
			      int this_device_mode,
			      int other_devices_mode);

       int XUngrabDeviceButton( Display *display,
				XDevice *device,
				unsigned int button,
				unsigned int modifiers,
				XDevice* modifier_device,
				Window grab_window);

       display
	      Specifies the connection to the X server.

       device
	      Specifies the device that is to be grabbed or released

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

       modifiers
	      Specifies the set of keymasks or AnyModifier.The mask is
	      the bitwise inclusive OR of the valid keymask bits.
	      Valid bits are: Shiftmask, LockMask, ControlMask,
	      Mod1Mask, Mod2Mask,Mod3Mask, Mod4Mask, Mod5Mask.

       modifier_device
	      specifies the device whose modifiers are to be used. If
	      the modifier_devicespecified is NULL, the X keyboard
	      will be used as the modifier_device.

       grab_window
	      Specifies the grab window.

       owner_events
	      Specifies a Boolean value that indicates whether the
	      deviceevents are to be reported as usual or reported
	      with respect to the grab windowif selected by the event
	      list.

       event_count
	      Specifies the number of event classes in the event list.

       event_list
	      Specifies which events are reported to the client.

       this_device_mode
	      Specifies further processing of events from this
	      device.You can pass GrabModeSync or GrabModeAsync.

       other_devices_mode
	      Specifies further processing of events from all other
	      devices.You can pass GrabModeSync or GrabModeAsync.

DESCRIPTION
	   The XGrabDeviceButton request establishes a passive grab. In
	   the future, the device is actively grabbed (as for XGrabDevice,
	   the last-grab time is set to the time at which the button was
	   pressed (as transmitted in the DeviceButtonPress event), and
	   the DeviceButtonPress event is reported if all of the following
	   conditions are true:
	     * The device is not grabbed, and the specified button is
	       logically pressed when the specified modifier keys are
	       logically down on the specified modifier device and no
	       other buttons or modifier keys are logically down.
	     * Either the grab window is an ancestor of (or is) the focus
	       window, OR the grab window is a descendent of the focus
	       window and contains the device.
	     * A passive grab on the same button/modifier combination does
	       not exist on any ancestor of grab_window.

	   The interpretation of the remaining arguments is as for
	   XGrabDevice. The active grab is terminated automatically when
	   the logical state of the device has all buttons released
	   (independent of the logical state of the 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/modifier 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.

	   A modifier_device of NULL indicates that the X keyboard is to
	   be used as the modifier_device.

	   If some other client has already issued a XGrabDeviceButton
	   with the same button/modifier 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. XGrabDeviceButton has no effect on an active grab.

	   XGrabDeviceButton can generate BadClass, BadDevice, BadMatch,
	   BadValue, and BadWindow errors..P The XUngrabDeviceButton
	   request releases the passive grab for a button/modifier
	   combination on the specified window if it was grabbed by this
	   client. A modifier 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. XUngrabDeviceButton has no effect on an active grab.

	   A modifier_device of NULL indicates that the X keyboard should
	   be used as the modifier_device.

	   XUngrabDeviceButton can generate BadDevice, BadMatch, BadValue
	   and BadWindow errors.

DIAGNOSTICS
	   BadDevice
		  An invalid device was specified. The specified device
		  does not exist or has not been opened by this client via
		  XOpenInputDevice. This error may also occur if the
		  specified device is the X keyboard or X pointer device.

	   BadMatch
		  This error may occur if an XGrabDeviceButton request was
		  made specifying a device that has no buttons, or
		  specifying a modifier device that has no keys.

	   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
	   XAllowDeviceEvents(3), XGrabDevice(3), XGrabDeviceKey(3)

					    03/09/2013			     XGRABDEVICEBUTTON(3)
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