1XGrabKeyboard(3) XLIB FUNCTIONS XGrabKeyboard(3)
2
6 XGrabKeyboard, XUngrabKeyboard - grab the keyboard
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9 int XGrabKeyboard(Display *display, Window grab_window, Bool
10 owner_events, int pointer_mode, int keyboard_mode, Time time);
11 int XUngrabKeyboard(Display *display, Time time);
13
15 display Specifies the connection to the X server.
16 grab_window
18 Specifies the grab window.
19 keyboard_mode
21 Specifies further processing of keyboard events. You can
22 pass GrabModeSync or GrabModeAsync.
23 owner_events
25 Specifies a Boolean value that indicates whether the keyboard
26 events are to be reported as usual.
27 pointer_mode
29 Specifies further processing of pointer events. You can pass
30 GrabModeSync or GrabModeAsync.
31 time Specifies the time. You can pass either a timestamp or Cur‐
33 rentTime.
34
36 The XGrabKeyboard function actively grabs control of the keyboard and
37 generates FocusIn and FocusOut events. Further key events are reported
38 only to the grabbing client. XGrabKeyboard overrides any active key‐
39 board grab by this client. If owner_events is False, all generated key
40 events are reported with respect to grab_window. If owner_events is
41 True and if a generated key event would normally be reported to this
42 client, it is reported normally; otherwise, the event is reported with
43 respect to the grab_window. Both KeyPress and KeyRelease events are
44 always reported, independent of any event selection made by the client.
45 If the keyboard_mode argument is GrabModeAsync, keyboard event process‐
47 ing continues as usual. If the keyboard is currently frozen by this
48 client, then processing of keyboard events is resumed. If the key‐
49 board_mode argument is GrabModeSync, the state of the keyboard (as
50 seen by client applications) appears to freeze, and the X server gener‐
51 ates no further keyboard events until the grabbing client issues a re‐
52 leasing XAllowEvents call or until the keyboard grab is released. Ac‐
53 tual keyboard changes are not lost while the keyboard is frozen; they
54 are simply queued in the server for later processing.
55 If pointer_mode is GrabModeAsync, pointer event processing is unaf‐
57 fected by activation of the grab. If pointer_mode is GrabModeSync, the
58 state of the pointer (as seen by client applications) appears to
59 freeze, and the X server generates no further pointer events until the
60 grabbing client issues a releasing XAllowEvents call or until the key‐
61 board grab is released. Actual pointer changes are not lost while the
62 pointer is frozen; they are simply queued in the server for later pro‐
63 cessing.
64 If the keyboard is actively grabbed by some other client, XGrabKeyboard
66 fails and returns AlreadyGrabbed. If grab_window is not viewable, it
67 fails and returns GrabNotViewable. If the keyboard is frozen by an ac‐
68 tive grab of another client, it fails and returns GrabFrozen. If the
69 specified time is earlier than the last-keyboard-grab time or later
70 than the current X server time, it fails and returns GrabInvalidTime.
71 Otherwise, the last-keyboard-grab time is set to the specified time is
72 replaced by the current X server time).
73 XGrabKeyboard can generate BadValue and BadWindow errors.
75 The XUngrabKeyboard function releases the keyboard and any queued
77 events if this client has it actively grabbed from either XGrabKeyboard
78 or XGrabKey. XUngrabKeyboard does not release the keyboard and any
79 queued events if the specified time is earlier than the last-keyboard-
80 grab time or is later than the current X server time. It also gener‐
81 ates FocusIn and FocusOut events. The X server automatically performs
82 an UngrabKeyboard request if the event window for an active keyboard
83 grab becomes not viewable.
84
86 BadValue Some numeric value falls outside the range of values accepted
87 by the request. Unless a specific range is specified for an
88 argument, the full range defined by the argument's type is
89 accepted. Any argument defined as a set of alternatives can
90 generate this error.
91 BadWindow A value for a Window argument does not name a defined Window.
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95 XAllowEvents(3), XGrabButton(3), XGrabKey(3), XGrabPointer(3)
96 Xlib - C Language X Interface
97X Version 11 libX11 1.7.0 XGrabKeyboard(3)