XChangePointerControl(3) - phpMan

XChangePointerControl(3) XLIB FUNCTIONS XChangePointerControl(3)

NAME
XChangePointerControl, XGetPointerControl - control pointer

SYNTAX
int XChangePointerControl(Display *display, Bool do_accel, Bool do_threshold, int
accel_numerator, int accel_denominator, int threshold);

int XGetPointerControl(Display *display, int *accel_numerator_return, int *accel_denomina-
tor_return, int *threshold_return);

ARGUMENTS
accel_denominator
Specifies the denominator for the acceleration multiplier.

accel_denominator_return
Returns the denominator for the acceleration multiplier.

accel_numerator
Specifies the numerator for the acceleration multiplier.

accel_numerator_return
Returns the numerator for the acceleration multiplier.

display Specifies the connection to the X server.

do_accel Specifies a Boolean value that controls whether the values for the accel_numera-
tor or accel_denominator are used.

do_threshold
Specifies a Boolean value that controls whether the value for the threshold is
used.

threshold Specifies the acceleration threshold.

threshold_return
Returns the acceleration threshold.

DESCRIPTION
The XChangePointerControl function defines how the pointing device moves. The accelera-
tion, expressed as a fraction, is a multiplier for movement. For example, specifying 3/1
means the pointer moves three times as fast as normal. The fraction may be rounded arbi-
trarily by the X server. Acceleration only takes effect if the pointer moves more than
threshold pixels at once and only applies to the amount beyond the value in the threshold
argument. Setting a value to -1 restores the default. The values of the do_accel and
do_threshold arguments must be True for the pointer values to be set, or the parameters
are unchanged. Negative values (other than -1) generate a BadValue error, as does a zero
value for the accel_denominator argument.

XChangePointerControl can generate a BadValue error.

The XGetPointerControl function returns the pointer's current acceleration multiplier and
acceleration threshold.

DIAGNOSTICS
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.