XChangePointerControl
Section: XLIB FUNCTIONS (3X11)
Updated: Release 5
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NAME
XChangePointerControl, XGetPointerControl - control pointer
SYNTAX
XChangePointerControl(display, do_accel, do_threshold, accel_numerator,
accel_denominator, threshold)
Display *display;
Bool do_accel, do_threshold;
int accel_numerator, accel_denominator;
int threshold;
XGetPointerControl(display, accel_numerator_return, accel_denominator_return,
threshold_return)
Display *display;
int *accel_numerator_return, *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
Index
- NAME
-
- SYNTAX
-
- ARGUMENTS
-
- DESCRIPTION
-
- DIAGNOSTICS
-
- SEE ALSO
-
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Time: 07:03:16 GMT, May 19, 2025