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17.1.5 Slider Attributes

Never use FL_NO_BOX as the boxtype for a slider. For FL_VERT_NICE_SLIDERs and FL_HOR_NICE_SLIDERs it’s best to use a FL_FLAT_BOX in the color of the background to get the nicest effect.

The first color argument (col1) to fl_set_object_color() controls the color of the background of the slider, the second (col2) the color of the slider itself.

You can control the size of the slider inside the box using the routine

void fl_set_slider_size(FL_OBJECT *obj, double size);

size should be a floating point value between 0.0 and 1.0. The default is FL_SLIDER_WIDTH, which is 0.1 for regular sliders and 0.15 for browser sliders. With a value for size of 1.0, the slider covers the box completely and can no longer be moved. This function does nothing if applied to sliders of type NICE_SLIDER and FILL_SLIDER.

To obtain the current setting of the slider size use

double fl_get_slider_size(FL_OBJECT *obj);

The routine

void fl_set_slider_precision(FL_OBJECT *obj, int prec);

sets the precision with which the value of the slider is shown. This only applies to sliders showing their value, i.e., valsliders. The argument must be between 0 and FL_SLIDER_MAX_PREC (currently set to 10).

By default, the value shown by a valslider is the slider value in floating point format. You can override the default by registering a filter function using the following routine

void fl_set_slider_filter(FL_OBJECT *obj,
                          const char *(*filter)(FL_OBJECT *,
                                                double value,
                                                int prec));

where value and prec are the slider value and precision respectively. The filter function filter should return a string that is to be shown. The default filter is equivalent to the following

const char *filter(FL_OBJECT *obj, double value, int prec) {
    static char buf[32];

     sprintf(buf, "%.*f", prec, value);
     return buf;
}

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