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3.23 Scrollbars

A scrollbar is used to scroll an object. To each scrollbar, there are three state variables: a total size, a display size and a starting position. Total size is the size of the object being scrolled, e.g. the total number of lines in a text widget; display size is the maximal size can be displayed simultaneously in a widget window, e.g. the number of lines in a text widget window; and starting position is the starting position of the object in the scrolled window, e.g. the index of the first line displayed in the text widget window.

A scrollbar is created by calling EZ_CreateWidget with type EZ_WIDGET_HORIZONTAL_SCROLLBAR EZ_WIDGET_HORIZONTAL_SCROLLBAR, or by calling the next function.

EZ_Widget *EZ_CreateScrollbar(EZ_Widget *parent, int type)

This function creates a scrollbar widget and returns the allocated data structure.


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