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XGrabDeviceKey(3X11)
X11R6
NAME
XGrabDeviceKey, XUngrabDeviceKey - grab/ungrab extension input device Keys
SYNOPSIS
XGrabDeviceKey(display, device, Key, modifiers, modifier_device,
grab_window, owner_events, event_count, event_list, this_device_mode,
other_devices_mode)
Display *display;
XDevice *device;
unsigned int Key;
unsigned int modifiers;
XDevice *modifier_device;
Window grab_window;
Bool owner_events;
unsigned int event_count;
XEventClass event_list;
int this_device_mode, other_devices_mode;
XUngrabDeviceKey(display, device, Key, modifiers, modifier_device,
grab_window)
Display *display;
XDevice *device;
unsigned int Key;
unsigned int modifiers;
XDevice *modifier_device;
Window grab_window;
ARGUMENTS
display
Specifies the connection to the X server.
device
Specifies the device that is to be grabbed or released
Key Specifies the device Key that is to be grabbed or released or AnyKey.
modifiers
Specifies the set of keymasks or AnyModifier. The mask is the bitwise
inclusive OR of the valid keymask bits. Valid bits are: ShiftMask,
LockMask, ControlMask, Mod1Mask, Mod2Mask, Mod3Mask, Mod4Mask,
Mod5Mask.
modifier_device
Specifies the device whose modifiers are to be used. If a
modifier_device of NULL is specified, the X keyboard will be used as
the modifier_device.
grab_window
Specifies the grab window.
owner_events
Specifies a Boolean value that indicates whether the device events are
to be reported as usual or reported with respect to the grab window if
selected by the event list.
event_count
Specifies the number of event classes in the event list.
event_list
Specifies which device events are reported to the client.
this_device_mode
Specifies further processing of events from this device. You can pass
GrabModeSync or GrabModeAsync.
other_devices_mode
Specifies further processing of events from other devices. You can
pass GrabModeSync or GrabModeAsync.
DESCRIPTION
The XGrabDeviceKey request establishes a passive grab. In the future, the
device is actively grabbed (as for XGrabDevice, the last-device-grab time
is set to the time at which the Key was pressed (as transmitted in the
DeviceKeyPress event), and the DeviceKeyPress event is reported if all of
the following conditions are true:
· The device is not grabbed, and the specified key is logically pressed
when the specified modifier keys are logically down, and no other keys
or modifier keys are logically down.
· The grab_window is an ancestor (or is) the focus window OR the grab
window is a descendant of the focus window and contains the device.
· The confine_to window (if any) is viewable.
· A passive grab on the same key/modifier combination does not exist on
any ancestor of grab_window.
The interpretation of the remaining arguments is as for XGrabDevice. The
active grab is terminated automatically when the logical state of the
device has the specified key released.
Note that the logical state of a device (as seen by means of the X
protocol) may lag the physical state if device event processing is frozen.
If the key is not AnyKey, it must be in the range specified by min_keycode
and max_keycode as returned by the XListInputDevices request. Otherwise, a
BadValue error results.
This request overrides all previous grabs by the same client on the same
Key/modifier combinations on the same window. A modifier of AnyModifier is
equivalent to issuing the grab 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
key of AnyKey is equivalent to issuing the request for all possible keys.
Otherwise, it is not required that the specified key currently be assigned
to a physical Key.
If a modifier_device of NULL is specified, the X keyboard will be used as
the modifier_device.
If some other client has already issued a XGrabDeviceKey with the same
Key/modifier 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. XGrabDeviceKey has no effect on an
active grab.
XGrabDeviceKey can generate BadAccess, BadClass, BadDevice, BadMatch,
BadValue, and BadWindow errors. It returns Success on successful
completion of the request.
The XUngrabDeviceKey request releases the passive grab for a key/modifier
combination on the specified window if it was grabbed by this client. A
modifier of AnyModifier is equivalent to issuing the ungrab request for all
possible modifier combinations, including the combination of no modifiers.
A Key of AnyKey is equivalent to issuing the request for all possible Keys.
XUngrabDeviceKey has no effect on an active grab.
If a modifier_device of NULL is specified, the X keyboard will be used as
the modifier_device.
XUngrabDeviceKey can generate BadDevice, BadMatch, BadValue and BadWindow
errors.
DIAGNOSTICS
BadDevice
An invalid device was specified. The specified device does not
exist or has not been opened by this client via XOpenInputDevice.
This error may also occur if the specified device is the X keyboard
or X pointer device.
BadMatch
This error may occur if an XGrabDeviceKey request was made
specifying a device that has no keys, or a modifier device that has
no keys.
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
XAllowDeviceEvents(3X11), XGrabDevice(3X11), XGrabDeviceButton(3X11)
Programming with Xlib
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Alphabetical
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