1XSELECTEXTENSIONEVEN(3)                                XSELECTEXTENSIONEVEN(3)
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NAME

6       XSelectExtensionEvent, XGetSelectedExtensionEvents - select extension
7       events, get the list of currently selected extension events
8

SYNOPSIS

10       #include <X11/extensions/XInput.h>
11
12       XSelectExtensionEvent( Display *display,
13                              Window w,
14                              XEventClass *event_list,
15                              int event_count);
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17       XGetSelectedExtensionEvents( Display *display,
18                                    Window w,
19                                    int *this_client_event_count_return,
20                                    XEventClass **this_client_event_list_return,
21                                    int *all_clients_event_count_return,
22                                    XEventClass **all_clients_event_list_return);
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24       display
25              Specifies the connection to the X server.
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27       w
28              Specifies the window whose events you are interested in.
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30       event_list
31              Specifies the list of event classes that describe the
32              events you are interested in.
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34       event_count
35              Specifies the count of event classes in the event list.
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37       this_client_event_count_return
38              Returns the count of event classes selected by this
39              client.
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41       this_client_event_list_return
42              Returns a pointer to the list of event classes selected
43              by this client.
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45       all_clients_event_count_return
46              Returns the count of event classes selected by all
47              clients.
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49       all_clients_event_list_return
50              Returns a pointer to the list of event classes selected
51              by all clients.
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DESCRIPTION

54           The XSelectExtensionEvent request causes the X server to report
55           the events associated with the specified list of event classes.
56           Initially, X will not report any of these events. Events are
57           reported relative to a window. If a window is not interested in
58           a device event, it usually propagates to the closest ancestor
59           that is interested, unless the do_not_propagate mask prohibits
60           it.
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62           Multiple clients can select for the same events on the same
63           window with the following restrictions:
64             * Multiple clients can select events on the same window
65               because their event masks are disjoint. When the X server
66               generates an event, it reports it to all interested
67               clients.
68             * Only one client at a time can select a DeviceButtonPress
69               event with automatic passive grabbing enabled, which is
70               associated with the event class DeviceButtonPressGrab. To
71               receive DeviceButtonPress events without automatic passive
72               grabbing, use event class DeviceButtonPress but do not
73               specify event class DeviceButtonPressGrab.
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75           The server reports the event to all interested clients.
76
77           Information contained in the XDevice structure returned by
78           XOpenDevice is used by macros to obtain the event classes that
79           clients use in making XSelectExtensionEvent requests. Currently
80           defined macros include DeviceKeyPress, DeviceKeyRelease,
81           DeviceButtonPress, DeviceButtonRelease, DeviceMotionNotify,
82           DeviceFocusIn, DeviceFocusOut, ProximityIn, ProximityOut,
83           DeviceStateNotify, DeviceMappingNotify, ChangeDeviceNotify,
84           DevicePointerMotionHint, DeviceButton1Motion,
85           DeviceButton2Motion, DeviceButton3Motion, DeviceButton4Motion,
86           DeviceButton5Motion, DeviceButtonMotion, DeviceOwnerGrabButton,
87           DeviceButtonPressGrab, and NoExtensionEvent.
88
89           To obtain the proper event class for a particular device, one
90           of the above macros is invoked using the XDevice structure for
91           that device. For example,
92                        DeviceKeyPress (*device, type, eventclass);
93
94           returns the DeviceKeyPress event type and the eventclass for
95           selecting DeviceKeyPress events from this device.
96
97           XSelectExtensionEvent can generate a BadWindow or BadClass
98           error. The XGetSelectedExtensionEvents request reports the
99           extension events selected by this client and all clients for
100           the specified window. This request returns pointers to two
101           XEventClass arrays. One lists the input extension events
102           selected by this client from the specified window. The other
103           lists the event classes selected by all clients from the
104           specified window. You should use XFree to free these two
105           arrays.
106
107           XGetSelectedExtensionEvents can generate a BadWindow error.
108

DIAGNOSTICS

110           BadWindow
111                  A value for a Window argument does not name a defined
112                  window.
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114           BadClass
115                  A value for an XEventClass is invalid.
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119                                  05/04/2023           XSELECTEXTENSIONEVEN(3)
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