MirOS Manual: XChangePointerControl(3), XGetPointerControl(3)

XChangePointerControl(3X11XLIB FUNCTIOXChangePointerControl(3X11)


     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

               Returns the denominator for the acceleration mul-

               Specifies the numerator for the acceleration mul-

               Returns the numerator for the acceleration multi-

     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.

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

     threshold 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 frac-
     tion may be rounded arbitrarily by the X server. Accelera-
     tion only takes effect if the pointer moves more than thres-
     hold pixels at once and only applies to the amount beyond

XFree86                   Version 4.5.0                         1

XChangePointerControl(3X11XLIB FUNCTIOXChangePointerControl(3X11)

     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 gen-
               erate this error.


     Xlib - C Language X Interface

XFree86                   Version 4.5.0                         2

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