Volume 6A: Motif Programming Manual

Design of an automatic ScrolledWindow

The work window can be almost any widget, but there can be only one work window per ScrolledWindow. If you

want to have more than one widget inside of a ScrolledWindow, you can place all of the widgets in a manager widget

and make that manager the work window. The clip window is always the size of the viewport portion of the

ScrolledWindow, which is the size of the ScrolledWindow minus the size of the ScrollBars and any borders and

margins. The clip window is not adjusted in size unless the ScrolledWindow is resized. The clip window is always

positioned at the origin, which means that you cannot use XtMoveWidget() or change its XmNx and XmNy

resources to reposition it in the ScrolledWindow. The internals of the ScrolledWindow are solely responsible for

changing the view in the clip window, although you can affect this behavior. While you can get a handle to the clip

window, you cannot remove it or replace it with another window.

10.1.2 The Application−defined Scrolling Model

In the application−defined scrolling model, which is the default model, the ScrolledWindow always makes itself the

same size as the work window. Just as for automatic scrolling, the application must provide the work window as a

child of the ScrolledWindow. The main reason to use application−defined scrolling is if the work window contains

more data than can possibly be loaded in the ...