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_denominator_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_numerator 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 acceleration, 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 arbitrarily 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.
SEE ALSO
Xlib - C Language X Interface