XGRABDEVICEKEY
XGRABDEVICEKEY
NAMESYNOPSIS
DESCRIPTION
DIAGNOSTICS
SEE ALSO
NAME
XGrabDeviceKey, XUngrabDeviceKey − grab/ungrab extension input device Keys
SYNOPSIS
#include <X11/extensions/XInput.h>
int
XGrabDeviceKey( 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,
int other_devices_mode);
int
XUngrabDeviceKey( Display *display,
XDevice *device,
unsigned int key,
unsigned int modifiers,
XDevice *modifier_device,
Window grab_window);
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 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 ofNULL 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
deviceevents are to be reported as usual or reported
with respect to the grab windowif 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 GrabModeSyncor 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(3), XGrabDevice(3), XGrabDeviceButton(3)
Opportunity
Personal Opportunity - Free software gives you access to billions of dollars of software at no cost. Use this software for your business, personal use or to develop a profitable skill. Access to source code provides access to a level of capabilities/information that companies protect though copyrights. Open source is a core component of the Internet and it is available to you. Leverage the billions of dollars in resources and capabilities to build a career, establish a business or change the world. The potential is endless for those who understand the opportunity.
Business Opportunity - Goldman Sachs, IBM and countless large corporations are leveraging open source to reduce costs, develop products and increase their bottom lines. Learn what these companies know about open source and how open source can give you the advantage.
Free Software
Free Software provides computer programs and capabilities at no cost but more importantly, it provides the freedom to run, edit, contribute to, and share the software. The importance of free software is a matter of access, not price. Software at no cost is a benefit but ownership rights to the software and source code is far more significant.
Free Office Software - The Libre Office suite provides top desktop productivity tools for free. This includes, a word processor, spreadsheet, presentation engine, drawing and flowcharting, database and math applications. Libre Office is available for Linux or Windows.
Free Books
The Free Books Library is a collection of thousands of the most popular public domain books in an online readable format. The collection includes great classical literature and more recent works where the U.S. copyright has expired. These books are yours to read and use without restrictions.
Source Code - Want to change a program or know how it works? Open Source provides the source code for its programs so that anyone can use, modify or learn how to write those programs themselves. Visit the GNU source code repositories to download the source.
Education
Study at Harvard, Stanford or MIT - Open edX provides free online courses from Harvard, MIT, Columbia, UC Berkeley and other top Universities. Hundreds of courses for almost all major subjects and course levels. Open edx also offers some paid courses and selected certifications.
Linux Manual Pages - A man or manual page is a form of software documentation found on Linux/Unix operating systems. Topics covered include computer programs (including library and system calls), formal standards and conventions, and even abstract concepts.
