update-drawable

Arguments: drawable

Causes drawable (an instance of the drawable class) to be redisplayed, either by calling the on-redisplay function or by causing the image in the bitmap-stream associated with drawable to be displayed.

An application may call update-drawable on a drawable that uses an on-redisplay function that draws its drawing based on parameters that may change over time. This forces the on-redisplay function to be called in order to draw the current version of its drawing when the control may not otherwise need to be redrawn.

If done in rapid succession, this can produce animation effects, especially if the use-bitmap-stream property is currently turned on in order to eliminate the flashing that is produced when erasing and redrawing directly on the visible window.

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This page was not revised from the 9.0 page.
Created 2015.5.21.