Linux Manual Pages

Free Software * Books

Source Code

Free Media

Linux

XSELECTEXTENSIONEVEN

NAME

XSelectExtensionEvent, XGetSelectedExtensionEvents − select extension events, get the list of currently selected extension events

SYNOPSIS

#include <X11/extensions/XInput.h>

XSelectExtensionEvent( Display *display,
Window w,
XEventClass *event_list,
int event_count);

XGetSelectedExtensionEvents( Display *display,
Window w,
int *this_client_event_count_return,
XEventClass **this_client_event_list_return,
int *all_clients_event_count_return,
XEventClass **all_clients_event_list_return);

display
Specifies the connection to the X server.

w
Specifies the window whose events you are interested in.

event_list
Specifies the list of event classes that describe the
events you are interested in.

event_count
Specifies the count of event classes in the event list.

this_client_event_count_return
Returns the count of event classes selected by this
client.

this_client_event_list_return
Returns a pointer to the list of event classes selected
by this client.

all_clients_event_count_return
Returns the count of event classes selected by all
clients.

all_clients_event_list_return
Returns a pointer to the list of event classes selected
by all clients.

DESCRIPTION

The XSelectExtensionEvent request causes the X server to report
the events associated with the specified list of event classes.
Initially, X will not report any of these events. Events are
reported relative to a window. If a window is not interested in
a device event, it usually propagates to the closest ancestor
that is interested, unless the do_not_propagate mask prohibits
it.

Multiple clients can select for the same events on the same
window with the following restrictions:
* Multiple clients can select events on the same window
because their event masks are disjoint. When the X server
generates an event, it reports it to all interested
clients.
* Only one client at a time can select a DeviceButtonPress
event with automatic passive grabbing enabled, which is
associated with the event class DeviceButtonPressGrab. To
receive DeviceButtonPress events without automatic passive
grabbing, use event class DeviceButtonPress but do not
specify event class DeviceButtonPressGrab.

The server reports the event to all interested clients.

Information contained in the XDevice structure returned by
XOpenDevice is used by macros to obtain the event classes that
clients use in making XSelectExtensionEvent requests. Currently
defined macros include DeviceKeyPress, DeviceKeyRelease,
DeviceButtonPress, DeviceButtonRelese, DeviceMotionNotify,
DeviceFocusIn, DeviceFocusOut, ProximityIn, ProximityOut,
DeviceStateNotify, DeviceMappiingNotify, ChangeDeviceNotify,
DevicePointerMotionHint, DeviceButton1Motion,
DeviceButton2Motion, DeviceButton3Motion, DeviceButton4Motion,
DeviceButton5Motion, DeviceButtonMotion, DeviceOwnerGrabButton,
DeviceButtonPressGrab, and NoExtensionEvent.

To obtain the proper event class for a particular device, one
of the above macros is invoked using the XDevice structure for
that device. For example,
DeviceKeyPress (*device, type, eventclass);

returns the DeviceKeyPress event type and the eventclass for
selecting DeviceKeyPress events from this device.

XSelectExtensionEvent can generate a BadWindow or BadClass
error. The XGetSelectedExtensionEvents request reports the
extension events selected by this client and all clients for
the specified window. This request returns pointers to two
XEventClass arrays. One lists the input extension events
selected by this client from the specified window. The other
lists the event classes selected by all clients from the
specified window. You should use XFree to free these two
arrays.

XGetSelectedExtensionEvents can generate a BadWindow error.

DIAGNOSTICS

BadWindow
A value for a Window argument does not name a defined
window.

BadClass
A value for an XEventClass is invalid.

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.