X Version 11 (Release 6.1)
XGrabKey(X3xlib)
XGrabKey --
grab keyboard keys
Synopsis
XGrabKey(display, keycode, modifiers, grab_window, owner_events,
pointer_mode, keyboard_mode)
Display *display;
int keycode;
unsigned int modifiers;
Window grab_window;
Bool owner_events;
int pointer_mode, keyboard_mode;
XUngrabKey(display, keycode, modifiers, grab_window)
Display *display;
int keycode;
unsigned int modifiers;
Window grab_window;
Arguments
display-
Specifies the connection to the X server.
grab_window-
Specifies the grab window.
keyboard_mode-
Specifies further processing of keyboard events.
You can pass GrabModeSync or GrabModeAsync.
keycode-
Specifies the KeyCode or AnyKey.
modifiers-
Specifies the set of keymasks or AnyModifier.
The mask is the bitwise inclusive OR of the valid keymask bits.
owner_events-
Specifies a Boolean value that indicates whether the keyboard events
are to be reported as usual.
pointer_mode-
Specifies further processing of pointer events.
You can pass GrabModeSync or GrabModeAsync.
Description
The XGrabKey
function establishes a passive grab on the keyboard.
In the future, the keyboard is actively grabbed (as for
XGrabKeyboard),
the last-keyboard-grab time is set to the time at which the
key was pressed (as transmitted in the KeyPress
event), and the KeyPress event is reported if all
of the following conditions are true:
-
The keyboard is not grabbed and the specified key
(which can itself be a modifier key) is logically pressed
when the specified modifier keys are logically down,
and no other modifier keys are logically down.
-
Either the grab_window is an ancestor of (or is)
the focus window, or the grab_window is a descendant
of the focus window and contains the pointer.
-
A passive grab on the same key combination does not exist
on any ancestor of grab_window.
The interpretation of the remaining arguments is as for
XGrabKeyboard.
The active grab is terminated automatically when the logical
state of the keyboard has the specified key released
(independent of the logical state of the modifier keys).
Note that the logical state of a device (as seen by client applications)
may lag the physical state if device event processing is frozen.
A modifiers argument of AnyModifier is equivalent
to issuing the request for all possible modifier combinations
(including the combination of no modifiers).
It is not required that all modifiers specified have
currently assigned KeyCodes.
A keycode argument of AnyKey is equivalent to
issuing the request for all possible KeyCodes.
Otherwise, the specified keycode must be in the range specified
by min_keycode and max_keycode
in the connection setup, or a ``BadValue'' error results.
If some other client has issued a XGrabKey
with the same key combination on the same window,
a ``BadAccess'' error results.
When using AnyModifier or AnyKey,
the request fails completely, and a ``BadAccess''
error results (no grabs are established)
if there is a conflicting grab for any combination.
XGrabKey can generate ``BadAccess'',
``BadValue'', and ``BadWindow'' errors.
The XUngrabKey function releases the key combination
on the specified window if it was grabbed by this client.
It has no effect on an active grab.
A modifiers of AnyModifier is equivalent to issuing
the request for all possible modifier combinations
(including the combination of no modifiers).
A keycode argument of AnyKey is equivalent
to issuing the request for all possible key codes.
XUngrabKey can generate ``BadValue''
and ``BadWindow'' error.
Diagnostics
``BadAccess''-
A client attempted
to grab a key/button combination already grabbed by another client.
``BadValue''-
Some numeric value falls outside the range of values accepted by the request.
Unless a specific range is specified for an argument, the full range defined
by the argument's type is accepted. Any argument defined as a set of
alternatives can generate this error.
``BadWindow''-
A value for a Window argument does not name a defined Window.
References
XGrabButton(X3xlib),
XGrabKeyboard(X3xlib),
XGrabPointer(X3xlib)
Xlib - C Language X Interface
© 2004 The SCO Group, Inc. All rights reserved.
UnixWare 7 Release 7.1.4 - 25 April 2004