XISELECTEVENTS
XISELECTEVENTS
NAMESYNOPSIS
DESCRIPTION
DIAGNOSTICS
NAME
XISelectEvents, XIGetSelectedEvents − select for or get selected XI2 events on the window.
SYNOPSIS
#include <X11/extensions/XInput2.h>
Status
XISelectEvents( Display *display,
Window win,
XIEventMask *masks,
int num_masks);
display
Specifies the connection to the X server.
masks
Device event mask.
num_masks
Number of masks in masks.
win
Specifies the window.
XIEventMask
*XIGetSelectedEvents( Display *display,
Window win,
int *num_masks_return);
display
Specifies the connection to the X server.
num_masks_return
Number of masks in the return value.
win
Specifies the window.
DESCRIPTION
XI2 events must be selected using XISelectEvents.
XISelectEvents
sets the event mask for this client on win.
Further events are only reported to this client if the event
type matches the selected event mask. The masks overrides
the
previously selected event mask for the given device.
If deviceid is
a valid device, the event mask is selected only
for this device. If deviceid is XIAllDevices or
XIAllMasterDevices, the event mask is selected for all
devices
or all master devices, respectively. The effective event
mask
is the bit−wise OR of the XIAllDevices,
XIAllMasterDevices and
the respective device´s event mask.
typedef struct
{
int deviceid;
int mask_len;
unsigned char* mask;
} XIEventMask;
The mask_len
specifies the length of mask in bytes. mask is a
binary mask in the form of (1 << event type). deviceid
must be
either a device or XIAllDevices or XIAllMasterDevices. A
client
may submit several masks with the same deviceid in one
request
but only the last mask will be effective.
XISelectEvents
can generate a BadValue, a BadDevice, and a
BadWindow error.
XIGetSelectedEvents
returns the events selected by this client on the given
window. If no events were selected on this window,
XIGetSelectedEvents
returns NULL and num_masks_return is set to 0. If an
internal error occurs,
XIGetSelectedEvents returns NULL and num_masks_return is set
to −1.
Otherwise, XIGetSelectedEvent returns the selected event
masks for all
devices including the masks for XIAllDevices and
XIAllMasterDevices
The caller must free the returned data using XFree().
DIAGNOSTICS
BadValue
A value is outside of the permitted range.
BadWindow
A value for a Window argument does not name a defined
window.
BadDevice
An invalid device was specified. The device does not
exist.
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