XIGRABENTER - Online Linux Manual PageSection : 3
Updated : 09/15/2021
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NAMEXIGrabEnter, XIUngrabEnter, XIGrabFocusIn, XIUngrabFocusIn − grab/ungrab enter or focus in events.
SYNOPSIS#include <X11/extensions/XInput.h>int XIGrabEnter( Display *display,
int deviceid,
Window grab_window,
Cursor cursor,
int grab_mode,
int paired_device_mode,
Bool owner_events,
XIEventMask *mask,
int num_modifiers,
XIGrabModifiers *modifiers_inout);int XIUngrabEnter( Display *display,
int deviceid,
Window grab_window
int num_modifiers,
XIGrabModifiers *modifiers);int XIGrabFocusIn ( Display *display,
int deviceid,
Window grab_window
int grab_mode,
int paired_device_mode,
Bool owner_events,
XIEventMask *mask,
int num_modifiers,
XIGrabModifiers *modifiers_inout);int XIUngrabFocusIn( Display *display,
int deviceid,
Window grab_window
int num_modifiers,
XIGrabModifiers *modifiers);
display
Specifies the connection to the X server.device
Specifies the device that is to be grabbed or releasednum_modifiers
Number of elements in modifiers or modifiers_inout.modifiers
Specifies the set of latched and base modifiers or
XIAnyModifier to ungrab. The data type is for
consistency with the respective grab request and the
status code of the XIGrabModifiers struct is ignored.modifiers_inout
Specifies the set of latched and base modifiers or
XIAnyModifier to grab. Returns the modifiers that could
not be grabbed and their status code.grab_window
Specifies the grab window.owner_events
Specifies a Boolean value that indicates whether the are
to be reported as usual or reported with respect to the
grab window.mask
Specifies the event mask.grab_mode
Specifies further processing of events from this device.
You can pass XIGrabModeSync or XIGrabModeAsync.paired_device_mode
Specifies further processing of events from the paired
master device. You can pass XIGrabModeSync or
XIGrabModeAsync. If deviceid specifies a floating slave
device, this parameter is ignored.
DESCRIPTIONXIGrabEnter and XIGrabFocusIn establish a passive grab. The
modifier device for a enter grab is the paired master device if
deviceid specifies a master pointer. Otherwise, the modifier
device is the device specified with deviceid.For XIGrabEnter and XIGrabFocusIn, in the future, the device is
actively grabbed (as for XIGrabDevice, the last−grab time is
set to the time at which the pointer/focus entered window) if
the device is not grabbed and the pointer has entered the
grab_window or the focus has been set to the grab_window when
the specified modifier keys are logically down on the modifier
device and no other buttons or modifier keys are logically
down.The interpretation of the remaining arguments is as for
XIGrabDevice. The active grab is terminated automatically when
the pointer leaves the window or the focus is set to a
different window (independent of the logical state of the
modifier keys).If the device is an attached slave device, the device is
automatically detached from the master device when the grab
activates and reattached to the same master device when the
grab deactivates. If the master device is removed while the
device is floating as a result of a grab, the device remains
floating once the grab deactivates.Note that the logical state of a device (as seen by client
applications) may lag the physical state if device event
processing is frozen.This request overrides all previous grabs by the same client of
the same type and modifier combinations on the same window. A
modifiers of XIAnyModifier 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.If some other client has already issued a XIGrabEnter or
XIGrabFocusIn on the same window, a BadAccess error results.
When using XIAnyModifier, the request fails completely, and a
XIBadAccess error results (no grabs are established) if there
is a conflicting grab for any combination. XIGrabEnter and
XIGrabFocusIn have no effect on an active grab.On success, XIGrabEnter and XIGrabFocusIn return 0;
If one or more modifier combinations could not be grabbed,
XIGrabEnter and XIGrabFocusIn return the number of failed
combinations and modifiers_inout contains the failed combinations
and their respective status codes.XIGrabEnter and XIGrabFocusIn can generate BadDevice,
BadMatch, BadValue, and BadWindow errors.XIUngrabEnter and XIUngrabFocusIn releases the passive grab on
the specified window if it was grabbed by this client. A
modifier of XIAnyModifier is equivalent to issuing the ungrab
request for all possible modifier combinations, including the
combination of no modifiers. XIUngrabEnter and XIUngrabFocusIn
have no effect on an active grab.XIUngrabEnter and XIUngrabFocusIn can generate BadDevice,
BadMatch, BadValue and BadWindow errors.
RETURN VALUEXIGrabEnter and XIGrabFocusIn return the number of modifier combination
that could not establish a passive grab. The modifiers are returned in
modifiers_inout, along with the respective error for this modifier
combination. If XIGrabEnter or XIGrabFocusIn return zero, passive grabs
with all requested modifier combinations were established successfully.
DIAGNOSTICSBadDevice
An invalid deviceid was specified.BadMatch
This error may occur if XIGrabEnter specified a device
that has no valuators, or XIGrabFocusIn specified a 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.
BUGSThe protocol headers for XI 2.0 did not provide
XIGrabModeAsync or XIGrabModeSync. Use GrabModeSync and
GrabModeAsync instead, respectively.
SEE ALSOXIAllowEvents(3) 0
Johanes Gumabo
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