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#### 17.2.5 Scrollbar Attributes

Never use `FL_NO_BOX` as the boxtype for a scrollbar. For `FL_VERT_NICE_SCROLLBAR`s and `FL_HOR_NICE_SCROLLBAR`s it’s best to use a `FL_FLAT_BOX` boxtype 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 scrollbar, the second (`col2`) the color of the sliding bar itself.

You can control the size of the sliding bar inside the box using the routine

    void fl_set_scrollbar_size(FL_OBJECT *obj, double size);

`size` should be a value between 0.0 and 1.0. The default is `FL_SLIDER_WIDTH`, which is 0.15 for all scrollbars With `size` set to 1.0, the scrollbar covers the box completely and can no longer be moved. This function does nothing if applied to scrollbars of type `FL_NICE_SCROLLBAR`.

The function

    double fl_get_scrollbar_size(FL_OBJECT *obj);

returns the current setting of the scrollbar size.