Table of Contents
XChangePointerControl,
XGetPointerControl - control pointer
- 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);
Specifies
the denominator for the acceleration multiplier.
Returns the denominator
for the acceleration multiplier.
Specifies the numerator for the acceleration
multiplier.
Returns the numerator for the acceleration multiplier.
Specifies
the connection to the X server.
Specifies a Boolean value that controls
whether the values for the accel_numerator or accel_denominator are used.
Specifies a Boolean value that controls whether the value for the threshold
is used.
Specifies the acceleration threshold.
Returns the acceleration threshold.
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.
- 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.
Xlib - C Language
X Interface
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