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### 17.2 Scrollbar Object

Scrollbars are similar to sliders (as a matter of fact, scrollbars are made with sliders and scrollbuttons) and alse let the user indicate a value between some fixed bounds. Both horizontal and vertical scrollbars exist. They have a minimum, maximum and current value (all floating point values). The user can change this value by dragging the sliding bar with the mouse or by pressing the scroll buttons. Per default whenever the value changes, it is reported to the application program via the callback function.