XGrabKey(3X11) XGrabKey(3X11)
NAME
XGrabKey, XUngrabKey - 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
Specifies the connection to the X server. Specifies the grab window. Specifies further processing of keyboard events. You can pass Grab-
ModeSync or GrabModeAsync. Specifies the KeyCode or AnyKey. Specifies the set of keymasks or AnyModifier. The mask is the bitwise inclu-
sive OR of the valid keymask bits. Specifies a Boolean value that indicates whether the keyboard events are to be reported as usual.
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 equiva-
lent 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 AnyModi-
fier 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 combina-
tion 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
A client attempted to grab a key/button combination already grabbed by another client. Some numeric value falls outside the range of val-
ues 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. A value for a Window argument does not name a defined
Window.
SEE ALSO
XAllowEvents(3X11), XGrabButton(3X11), XGrabKeyboard(3X11), XGrabPointer(3X11)
Xlib -- C Language X Interface
XGrabKey(3X11)