Generic FunctionPackage: cgToCDocOverviewCGDocRelNotesFAQIndexPermutedIndex
Allegro CL version 9.0
Unrevised from 8.2 to 9.0.
8.2 version

scroll-page-portion

Arguments: chart-widget

Returns the value of the scroll-page-portion property of a chart-widget. The value may be set at creation time by passing the :scroll-page-portion initarg, or any time later by calling (setf scroll-page-portion).

scroll-page-portion is the portion of a whole "page" by which a chart-widget will scroll along its item-axis when the user presses the PageUp or PageDown key. A "page" means the length of the item-axis, so a value of 1 would cause a keystroke to scroll all of the current contents off to reveal contents that lie just out of view.

The value should be a positive real number, and generally should be no greater than 1 to be useful. The default value is 0.7 so that a portion of the pre-scrolled contents remains in view after a page scroll for context.

See also scroll-line-items and scroll-on-drag.

See chart-widget and also cg-chart-widget.htm.


Copyright (c) 1998-2012, Franz Inc. Oakland, CA., USA. All rights reserved.
Documentation for Allegro CL version 9.0. This page was not revised from the 8.2 page.
Created 2012.5.30.

ToCDocOverviewCGDocRelNotesFAQIndexPermutedIndex
Allegro CL version 9.0
Unrevised from 8.2 to 9.0.
8.2 version