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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);
- 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.
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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