XGrabDeviceButton, XUngrabDeviceButton - grab/ungrab extension input
   device buttons


   #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);

          Specifies the connection to the X server.

          Specifies the device that is to be grabbed or released

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

          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.

          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.

          Specifies the grab window.

          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

          Specifies the number of event classes in the event list.

          Specifies which events are reported to the client.

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

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


       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.


              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.

              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.

              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.

              A value for a Window argument does not name a defined


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

                              03/09/2013              XGRABDEVICEBUTTON(3)


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