1XIGRABDEVICE(3)                                                XIGRABDEVICE(3)
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3
4

NAME

6       XIGrabDevice, XIUngrabDevice - grab or ungrab the device.
7

SYNOPSIS

9       #include <X11/extensions/XInput2.h>
10
11       Status XIGrabDevice( Display *display,
12                            int deviceid,
13                            Window grab_window,
14                            Time time,
15                            Cursor cursor,
16                            int grab_mode,
17                            int paired_device_mode,
18                            Bool owner_events,
19                            XIEventMask *mask);
20
21       Status XIUngrabDevice( Display *display,
22                              int deviceid,
23                              Time time);
24
25       cursor
26              Specifies the cursor image to display for the duration
27              of the grab.
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29       display
30              Specifies the connection to the X server.
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32       deviceid
33              Specifies the device that should be grabbed or
34              ungrabbed.
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36       grab_mode, paired_device_mode
37              The grab mode for this device and (if applicable) the
38              paired device.
39
40       grab_window
41              The grab window.
42
43       mask
44              Event mask.
45
46       owner_events
47              True if events are to be reported normally.
48
49       time
50              A valid timestamp or CurrentTime.
51

DESCRIPTION

53           XIGrabDevice actively grabs control of the device. Further
54           device events are reported only to the grabbing client.
55           XIGrabDevice overrides any active device grab by this client.
56
57           If the device is an attached slave device, the device is
58           automatically detached from the master device and reattached to
59           the same master device when client ungrabs the device. If the
60           master device is removed while the device is floating as a
61           result of a grab, the device remains floating once the grab
62           deactivates.
63
64           If owner_events is False, all generated device events are
65           reported with respect to grab_window if selected. If
66           owner_events is True and if a generated device event would
67           normally be reported to this client, it is reported normally;
68           otherwise, the event is reported with respect to the
69           grab_window, and is only reported if specified in the event
70           mask.
71
72           If the grab_mode argument is XIGrabModeAsync, device event
73           processing continues as usual. If the device is currently
74           frozen by this client, then processing of device events is
75           resumed. If the grab_mode argument is XIGrabModeSync, the state
76           of the device (as seen by client applications) appears to
77           freeze, and the X server generates no further device events
78           until the grabbing client issues a releasing XIAllowEvents call
79           or until the device grab is released. Actual device changes are
80           not lost while the device is frozen; they are simply queued in
81           the server for later processing.
82
83           If paired_device_mode is XIGrabModeAsync, processing of events
84           from the paired master device is unaffected by activation of
85           the grab. If paired_device_mode is XIGrabModeSync, the state of
86           the paired master device (as seen by client applications)
87           appears to freeze, and the X server generates no further events
88           from this device until the grabbing client issues a releasing
89           XIAllowEvents call or until the device grab is released. Actual
90           events are not lost while the devices are frozen; they are
91           simply queued in the server for later processing. If the device
92           is a slave device paired_device_mode is ignored.
93
94           If the device is actively grabbed by some other client,
95           XIGrabDevice fails and returns AlreadyGrabbed. If grab_window
96           is not viewable, it fails and returns GrabNotViewable. If the
97           device is frozen by an active grab of another client, it fails
98           and returns GrabFrozen. If the specified time is earlier than
99           the last-device-grab time or later than the current X server
100           time, it fails and returns GrabInvalidTime. Otherwise, the
101           last-device-grab time is set to the specified time. CurrentTime
102           is replaced by the current X server time.
103
104           If cursor is not None this cursor is displayed until the client
105           calls XIUngrabDevice.
106
107           XIGrabDevice can generate BadDevice, BadValue, and BadWindow
108           errors.
109
110           The XIUngrabDevice request releases the device and any queued
111           events if this client has it actively grabbed from either
112           XIGrabDevice or XIGrabKey or XIGrabButton. If other devices are
113           frozen by the grab, XUngrabDevice thaws them. XUngrabDevice
114           does not release the device and any queued events if the
115           specified time is earlier than the last-device-grab time or is
116           later than the current X server time. The X server
117           automatically performs an XIUngrabDevice request if the event
118           window for an active device grab becomes not viewable.
119
120           XIUngrabDevice can generate a BadDevice error.
121

DIAGNOSTICS

123           BadValue
124                  A value is outside of the permitted range.
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126           BadDevice
127                  An invalid device was specified. The device does not
128                  exist or is not a appropriate for the type of change.
129
130           BadMatch
131                  The window is not viewable.
132
133           BadWindow
134                  A value for a Window argument does not name a defined
135                  Window.
136

BUGS

138           The protocol headers for XI 2.0 did not provide
139           XIGrabModeAsync or XIGrabModeSync. Use GrabModeSync and
140           GrabModeAsync instead, respectively.
141

SEE ALSO

143           XIAllowEvents(3)
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147                                  06/19/2019                   XIGRABDEVICE(3)
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