trackbar-pane

The class of widget-windows that are instantiated whenever a trackbar is added to a window. Probably not of concern to applications unless it needs to intercept low-level window events of a trackbar subclass or otherwise add methods to the widget-window of a trackbar. See os-widget-window.

A diagram of window and widget classes is shown in Widget and window classes in cgide.htm.

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Created 2019.8.20.