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XCHANGEPOINTERDEVICE

NAME
SYNOPSIS
DESCRIPTION
DIAGNOSTICS
SEE ALSO

NAME

XChangePointerDevice − change which device is the X pointer

SYNOPSIS

#include <X11/extensions/XInput.h>

Status XChangePointerDevice( Display *display,
XDevice *device,
int xaxis,
int yaxis);

display
Specifies the connection to the X server.

device
Specifies the device to be used as the X pointer.

xaxis
Specifies the axis of the device to be used as the X
pointer x−axis.

yaxis
Specifies the axis of the device to be used as the X
pointer y−axis.

DESCRIPTION

The XChangePointerDevice request causes the server to use the
specified device as the X pointer. The device must have been
opened by the client via XOpenDevice or a BadDevice error will
result. The device must support input class Valuators or a
BadMatch error will result. If the implementation does not
support use of the specified device as the X pointer, a
BadDevice error will result.

If the specified device is grabbed by another client,
AlreadyGrabbed is returned. If the specified device is frozen
by a grab on another device, GrabFrozen is returned. If the
request is successful, Success is returned.

If the request succeeds, a ChangeDeviceNotify event is sent to
all clients that have selected that event. A MappingNotify
event with request = MappingPointer is sent to all clients. The
specified device becomes the X pointer, and the old X pointer
becomes accessible through the input extension protocol
requests.

XChangePointerDevice can generate a BadDevice or a BadMatch
error.

DIAGNOSTICS

BadDevice
An invalid device was specified. The specified device
does not exist, has not been opened by this client via
XOpenInputDevice, or is already one of the core X input
devices (pointer or keyboard). This error may also occur
if the server implementation does not support using the
specified device as the X pointer.

BadMatch
This error may occur if an XChangePointerDevice request
was made specifying a device that has less than two
valuators, or specifying a valuator index beyond the
range supported by the device.

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