scroll-on-drag

Arguments: chart-widget

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

scroll-on-drag is a boolean value indicating whether the user can scroll a chart-widget along its item-axis by clicking and dragging the chart body. The default value is t.

Mouse scrolling is done by clicking down anywhere in the body of the chart and then dragging along the direction of the item-axis. The chart contents will move by an amount equal to the mouse movement distance multiplied by the scroll-on-drag-factor property.

Even when this property is nil, a chart-widget can still be scrolled with the PageUp, PageDown, and arrow keys. See scroll-line-items and scroll-page-portion.

A chart is never scrollable if its fit-chart-items property is true, because it then squeezes all data into the viewable area.

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

Copyright (c) 1998-2009, Franz Inc. Oakland, CA., USA. All rights reserved.
Documentation for Allegro CL version 8.1. This page is new in the 8.1 release.
Created 2007.4.30.