Main object implementing scroll logic for coordination between a scrollable wigdet and a scrollbar widget.
scrollable_adjustment implements the main logic and provides a lowlevel interface for controlling how mouse events are translated to scroll offsets (
set_mouse_mode) and the size of the scrollbar (
scrollable_document provides a higher level interface for configuring the operation of the scrollbar where the scrollbar is used to reflect the area of a page within a potentially larger document.
scrollbar_private is an internal interface between the
scrollable object and a
scrollbar used to exchange parameters needed to perform rendering.