XGrabKey(XS)

Syntax

   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 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.

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.

See also