1XGRABDEVICE(3)                                                  XGRABDEVICE(3)
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3
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NAME

6       XGrabDevice, XUngrabDevice - grab/release the specified extension
7       device
8

SYNOPSIS

10       #include <X11/extensions/XInput.h>
11
12       int XGrabDevice( Display *display,
13                        XDevice* device,
14                        Window grab_window,
15                        Bool owner_events,
16                        int event_count,
17                        XEventClass *event_list,
18                        int this_device_mode,
19                        int other_devices_mode,
20                        Time time);
21
22       int XUngrabDevice( Display *display,
23                          XDevice *device,
24                          Time time);
25
26       display
27              Specifies the connection to the X server.
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29       device
30              Specifies the device to be grabbed or released.
31
32       grab_window
33              Specifies the id of a window to be associated with the
34              device.
35
36       owner_events
37              Specifies a Boolean value that indicates whether
38              the events from the device are to be reported as usual or
39              reported with respect to the grab window if selected by
40              the event list.
41
42       event_count
43              Specifies the number of elements in the event_list
44              array.
45
46       event_list
47              Specifies a pointer to a list of event classes that
48              indicates which events the client wishes to receive.
49              These event classes must have been obtained specifying
50              the device being grabbed.
51
52       this_device_mode
53              Specifies further processing of events from this
54              device. You can pass GrabModeSync or GrabModeAsync.
55
56       other_devices_mode
57              Specifies further processing of events from other
58              devices. You can pass GrabModeSync or GrabModeAsync.
59
60       time
61              Specifies the time. You can pass either a timestamp or
62              CurrentTime.
63

DESCRIPTION

65           The XGrabDevice request actively grabs control of the device
66           and generates DeviceFocusIn and DeviceFocusOut events. Further
67           device events are reported only to the grabbing
68           client. XGrabDevice overrides any active device grab by this
69           client. event_list is a pointer to a list of event classes.
70           This list indicates which events the client wishes to receive
71           while the grab is active. If owner_events is False, all
72           generated device events are reported with respect to
73           grab_window if selected. If owner_events is True and if a
74           generated device event would normally be reported to this
75           client, it is reported normally; otherwise, the event is
76           reported with respect to the grab_window, and is only reported
77           if specified in the event_list.
78
79           If the this_device_mode argument is GrabModeAsync, device event
80           processing continues as usual. If the device is currently
81           frozen by this client, then processing of device events is
82           resumed. If the this_device_mode argument is GrabModeSync, the
83           state of the device (as seen by client applications) appears to
84           freeze, and the X server generates no further device events
85           until the grabbing client issues a releasing XAllowDeviceEvents
86           call or until the device grab is released. Actual device
87           changes are not lost while the device is frozen; they are
88           simply queued in the server for later processing.
89
90           If other_devices_mode is GrabModeAsync, processing of events
91           from other devices is unaffected by activation of the grab. If
92           other_devices_mode is GrabModeSync, the state of all devices
93           except the grabbed device (as seen by client applications)
94           appears to freeze, and the X server generates no further events
95           from those devices until the grabbing client issues a releasing
96           XAllowDeviceEvents call or until the device grab is released.
97           Actual events are not lost while the devices are frozen; they
98           are simply queued in the server for later processing.
99
100           If the device is actively grabbed by some other client,
101           XGrabDevice fails and returns AlreadyGrabbed. If grab_window is
102           not viewable, it fails and returns GrabNotViewable. If the
103           device is frozen by an active grab of another client, it fails
104           and returns GrabFrozen. If the specified time is earlier than
105           the last-device-grab time or later than the current X server
106           time, it fails and returns GrabInvalidTime. Otherwise, the
107           last-device-grab time is set to the specified time
108           (CurrentTime is replaced by the current X server time).
109
110           If a grabbed device is closed by a client while an active grab
111           by that client is in effect, the active grab is released. If
112           the device is frozen only by an active grab of the requesting
113           client, it is thawed.
114
115           XGrabDevice can generate BadClass, BadDevice, BadValue, and
116           BadWindow errors.
117
118           The XUngrabDevice request releases the device and any queued
119           events if this client has it actively grabbed from either
120           XGrabDevice or XGrabDeviceKey. If other devices are frozen by
121           the grab, XUngrabDevice thaws them. XUngrabDevice does not
122           release the device and any queued events if the specified time
123           is earlier than the last-device-grab time or is later than the
124           current X server time. It also generates DeviceFocusIn and
125           DeviceFocusOut events. The X server automatically performs an
126           UngrabDevice request if the event window for an active device
127           grab becomes not viewable.
128
129           XUngrabDevice can generate a BadDevice error.
130

DIAGNOSTICS

132           BadDevice
133                  An invalid device was specified. The specified device
134                  does not exist or has not been opened by this client via
135                  XOpenInputDevice. This error may also occur if the
136                  specified device is the X keyboard or X pointer device.
137
138           BadValue
139                  Some numeric value falls outside the range of values
140                  accepted by the request. Unless a specific range is
141                  specified for an argument, the full range defined by the
142                  argument's type is accepted. Any argument defined as a
143                  set of alternatives can generate this error.
144
145           BadWindow
146                  A value for a Window argument does not name a defined
147                  Window.
148

SEE ALSO

150           XAllowDeviceEvents(3), XGrabDeviceButton(3), XGrabDeviceKey(3)
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154                                  09/15/2021                    XGRABDEVICE(3)
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