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NAME

       XIGrabDevice, XIUngrabDevice - grab or ungrab the device.

SYNOPSIS

       #include <X11/extensions/XInput2.h>

       Status XIGrabDevice( Display *display,
                            int deviceid,
                            Window grab_window,
                            Time time,
                            Cursor cursor,
                            int grab_mode,
                            int paired_device_mode,
                            Bool owner_events,
                            XIEventMask *mask);

       Status XIUngrabDevice( Display *display,
                              int deviceid,
                              Time time);

       cursor
              Specifies the cursor image to display for the duration
              of the grab.

       display
              Specifies the connection to the X server.

       deviceid
              Specifies the device that should be grabbed or
              ungrabbed.

       grab_mode, paired_device_mode
              The grab mode for this device and (if applicable) the
              paired device.

       grab_window
              The grab window.

       mask
              Event mask.

       owner_events
              True if events are to be reported normally.

       time
              A valid timestamp or CurrentTime.

DESCRIPTION

           XIGrabDevice actively grabs control of the device. Further
           device events are reported only to the grabbing client.
           XIGrabDevice overrides any active device grab by this client.

           If the device is an attached slave device, the device is
           automatically detached from the master device and reattached to
           the same master device when client ungrabs the device. If the
           master device is removed while the device is floating as a
           result of a grab, the device remains floating once the grab
           deactivates.

           If owner_events is False, all generated device events are
           reported with respect to grab_window if selected. If
           owner_events is True and if a generated device event would
           normally be reported to this client, it is reported normally;
           otherwise, the event is reported with respect to the
           grab_window, and is only reported if specified in the event
           mask.

           If the grab_mode argument is XIGrabModeAsync, device event
           processing continues as usual. If the device is currently
           frozen by this client, then processing of device events is
           resumed. If the grab_mode argument is XIGrabModeSync, the state
           of the device (as seen by client applications) appears to
           freeze, and the X server generates no further device events
           until the grabbing client issues a releasing XIAllowEvents call
           or until the device grab is released. Actual device changes are
           not lost while the device is frozen; they are simply queued in
           the server for later processing.

           If paired_device_mode is XIGrabModeAsync, processing of events
           from the paired master device is unaffected by activation of
           the grab. If paired_device_mode is XIGrabModeSync, the state of
           the paired master device (as seen by client applications)
           appears to freeze, and the X server generates no further events
           from this device until the grabbing client issues a releasing
           XIAllowEvents call or until the device grab is released. Actual
           events are not lost while the devices are frozen; they are
           simply queued in the server for later processing. If the device
           is a slave device paired_device_mode is ignored.

           If the device is actively grabbed by some other client,
           XIGrabDevice fails and returns AlreadyGrabbed. If grab_window
           is not viewable, it fails and returns GrabNotViewable. If the
           device is frozen by an active grab of another client, it fails
           and returns GrabFrozen. If the specified time is earlier than
           the last-device-grab time or later than the current X server
           time, it fails and returns GrabInvalidTime. Otherwise, the
           last-device-grab time is set to the specified time. CurrentTime
           is replaced by the current X server time.

           If cursor is not None this cursor is displayed until the client
           calls XIUngrabDevice.

           XIGrabDevice can generate BadDevice, BadValue, and BadWindow
           errors.

           The XIUngrabDevice request releases the device and any queued
           events if this client has it actively grabbed from either
           XIGrabDevice or XIGrabKey or XIGrabButton. If other devices are
           frozen by the grab, XUngrabDevice thaws them. XUngrabDevice
           does not release the device and any queued events if the
           specified time is earlier than the last-device-grab time or is
           later than the current X server time. The X server
           automatically performs an XIUngrabDevice request if the event
           window for an active device grab becomes not viewable.

           XIUngrabDevice can generate a BadDevice error.

DIAGNOSTICS

           BadValue
                  A value is outside of the permitted range.

           BadDevice
                  An invalid device was specified. The device does not
                  exist or is not a appropriate for the type of change.

           BadMatch
                  The window is not viewable.

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

BUGS

           The protocol headers for XI 2.0 did not provide
           XIGrabModeAsync or XIGrabModeSync. Use GrabModeSync and
           GrabModeAsync instead, respectively.

SEE ALSO

           XIAllowEvents(3)

                                  03/09/2013                   XIGRABDEVICE(3)



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