XGrDvKey(1) X Version 11 XGrDvKey(1)XGrabDeviceKey(3X11) X FUNCTIONS XGrabDeviceKey(3X11)NAME
XGrabDeviceKey, XUngrabDeviceKey - grab/ungrab extension input device
Keys
SYNTAX
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 transmit‐
ted 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 pro‐
tocol ) 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_key‐
code 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 Any‐
Modifier 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 con‐
flicting 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 com‐
pletion of the request.
The XUngrabDeviceKey request releases the passive grab for a key/modi‐
fier 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 combina‐
tion 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 BadWin‐
dow errors.
DIAGNOSTICS
BadDevice An invalid device was specified. The specified device does
not exist or has not been opened by this client via XOpen‐
InputDevice. 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 speci‐
fied for an argument, the full range defined by the argu‐
ment'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 Win‐
dow.
SEE ALSOXAllowDeviceEvents(3X),
XGrabDevice(3X),
XGrabDeviceButton(3X),
Programming with Xlib
X Version 11 Release 6 XGrabDeviceKey(3X11)
