XGrDvBut(1) X Version 11 XGrDvBut(1)XGrabDeviceButton(3X11) X FUNCTIONS XGrabDeviceButton(3X11)NAME
XGrabDeviceButton, XUngrabDeviceButton - grab/ungrab extension input
device buttons
SYNTAX
XGrabDeviceButton(display, device, button, modifiers, modifier_device, grab_window,
owner_events, event_count, event_list, this_device_mode, other_devices_mode)
Display *display;
XDevice *device;
unsigned int button;
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;
XUngrabDeviceButton(display, device, button, modifiers, modifier_device, grab_window)
Display *display;
XDevice *device;
unsigned int button;
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
button Specifies the device button that is to be grabbed or
released or AnyButton.
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
the modifier_device specified is NULL, 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 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 all other
devices. You can pass GrabModeSync or GrabModeAsync.
DESCRIPTION
The XGrabDeviceButton request establishes a passive grab. In the
future, the device is actively grabbed (as for XGrabDevice, the last-
grab time is set to the time at which the button was pressed (as trans‐
mitted in the DeviceButtonPress event), and the DeviceButtonPress event
is reported if all of the following conditions are true:
· The device is not grabbed, and the specified button is logically
pressed when the specified modifier keys are logically down on the
specified modifier device and no other buttons or modifier keys
are logically down.
· Either the grab window is an ancestor of (or is) the focus window,
OR the grab window is a descendent of the focus window and con‐
tains the device.
· A passive grab on the same button/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 all buttons released (independent of the logical state
of the modifier keys).
Note that the logical state of a device (as seen by client applica‐
tions) may lag the physical state if device event processing is frozen.
This request overrides all previous grabs by the same client on the
same button/modifier combinations on the same window. A modifiers 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 button of AnyButton is equivalent to issuing the request
for all possible buttons. Otherwise, it is not required that the spec‐
ified button currently be assigned to a physical button.
A modifier_device of NULL indicates that the X keyboard is to be used
as the modifier_device.
If some other client has already issued a XGrabDeviceButton with the
same button/modifier combination on the same window, a BadAccess error
results. When using AnyModifier or AnyButton , the request fails com‐
pletely, and a BadAccess error results (no grabs are established) if
there is a conflicting grab for any combination. XGrabDeviceButton has
no effect on an active grab.
XGrabDeviceButton can generate BadClass, BadDevice, BadMatch, BadValue,
and BadWindow errors.
The XUngrabDeviceButton request releases the passive grab for a but‐
ton/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 button of AnyButton is equivalent to
issuing the request for all possible buttons. XUngrabDeviceButton has
no effect on an active grab.
A modifier_device of NULL indicates that the X keyboard should be used
as the modifier_device.
XUngrabDeviceButton can generate BadDevice, BadMatch, BadValue and Bad‐
Window 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 XGrabDeviceButton request was
made specifying a device that has no buttons, or specifying
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),
XGrabDeviceKey(3X),
Programming With Xlib
X Version 11 Release 6 XGrabDeviceButton(3X11)
