scroll-range

Arguments: window

Returns two values indicating the width and height of the scrollable page of window. The values exclude the area that is visible within the window (i.e. the visible-box-width and the visible-box-height). So a window that has exactly nothing scrolled out of view would have a scroll-range of zero, zero.

An application may override the default method of this and several other generic functions in order to implement a custom scrolling scheme that scrolls by logical picture objects rather than by pixels. See the source code of the example entitled 'Scrolling by arbitrary objects rather than pixels' on the Examples tab of the Navigator dialog for a complete example. More on this point and a list of the relevant generic functions can be found on the horizontal-scroll-bar and vertical-scroll-bar pages.

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This page was not revised from the 10.0 page.
Created 2019.8.20.