1XGrabKey(3)                     XLIB FUNCTIONS                     XGrabKey(3)
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NAME

6       XGrabKey, XUngrabKey - grab keyboard keys
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SYNTAX

9       int  XGrabKey(Display  *display,  int  keycode, unsigned int modifiers,
10              Window grab_window, Bool  owner_events,  int  pointer_mode,  int
11              keyboard_mode);
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13       int  XUngrabKey(Display  *display, int keycode, unsigned int modifiers,
14              Window grab_window);
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ARGUMENTS

17       display   Specifies the connection to the X server.
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19       grab_window
20                 Specifies the grab window.
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22       keyboard_mode
23                 Specifies further processing of  keyboard  events.   You  can
24                 pass GrabModeSync or GrabModeAsync.
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26       keycode   Specifies the KeyCode or AnyKey.
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28       modifiers Specifies  the  set  of keymasks or AnyModifier.  The mask is
29                 the bitwise inclusive OR of the valid keymask bits.
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31       owner_events
32                 Specifies a Boolean value that indicates whether the keyboard
33                 events are to be reported as usual.
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35       pointer_mode
36                 Specifies further processing of pointer events.  You can pass
37                 GrabModeSync or GrabModeAsync.
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DESCRIPTION

40       The XGrabKey function establishes a passive grab on the  keyboard.   In
41       the  future,  the  keyboard is actively grabbed (as for XGrabKeyboard),
42       the last-keyboard-grab time is set to the time at  which  the  key  was
43       pressed  (as transmitted in the KeyPress event), and the KeyPress event
44       is reported if all of the following conditions are true:
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46       ·    The keyboard is not grabbed  and  the  specified  key  (which  can
47            itself  be a modifier key) is logically pressed when the specified
48            modifier keys are logically down, and no other modifier  keys  are
49            logically down.
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51       ·    Either the grab_window is an ancestor of (or is) the focus window,
52            or the grab_window is a descendant of the focus  window  and  con‐
53            tains the pointer.
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55       ·    A  passive  grab on the same key combination does not exist on any
56            ancestor of grab_window.
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58       The interpretation of the remaining arguments is as for  XGrabKeyboard.
59       The  active  grab is terminated automatically when the logical state of
60       the keyboard has the specified key released (independent of the logical
61       state  of  the  modifier  keys),  at  which point a KeyRelease event is
62       reported to the grabbing window.
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64       Note that the logical state of a device (as  seen  by  client  applica‐
65       tions) may lag the physical state if device event processing is frozen.
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67       A  modifiers  argument  of  AnyModifier  is  equivalent  to issuing the
68       request for all possible modifier combinations (including the  combina‐
69       tion of no modifiers).  It is not required that all modifiers specified
70       have currently assigned KeyCodes.  A  keycode  argument  of  AnyKey  is
71       equivalent  to  issuing  the request for all possible KeyCodes.  Other‐
72       wise, the specified keycode must be in the range specified by  min_key‐
73       code  and  max_keycode  in  the  connection  setup, or a BadValue error
74       results.
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76       If some other client has issued a XGrabKey with the same  key  combina‐
77       tion on the same window, a BadAccess error results.  When using AnyMod‐
78       ifier or AnyKey, the request fails completely, and  a  BadAccess  error
79       results  (no  grabs are established) if there is a conflicting grab for
80       any combination.
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82       XGrabKey can generate BadAccess, BadValue, and BadWindow errors.
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84       The XUngrabKey function releases the key combination on  the  specified
85       window if it was grabbed by this client.  It has no effect on an active
86       grab.  A modifiers of AnyModifier is equivalent to issuing the  request
87       for all possible modifier combinations (including the combination of no
88       modifiers).  A keycode argument of AnyKey is equivalent to issuing  the
89       request for all possible key codes.
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91       XUngrabKey can generate BadValue and BadWindow error.
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DIAGNOSTICS

94       BadAccess A  client  attempted to grab a key/button combination already
95                 grabbed by another client.
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97       BadValue  Some numeric value falls outside the range of values accepted
98                 by  the request.  Unless a specific range is specified for an
99                 argument, the full range defined by the  argument's  type  is
100                 accepted.   Any argument defined as a set of alternatives can
101                 generate this error.
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103       BadWindow A value for a Window argument does not name a defined Window.
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SEE ALSO

106       XAllowEvents(3), XGrabButton(3), XGrabKeyboard(3), XGrabPointer(3)
107       Xlib - C Language X Interface
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111X Version 11                     libX11 1.6.12                     XGrabKey(3)
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