redisplay-event

Arguments: drawable stream

Called whenever a drawable control needs to be redrawn, such as when it is uncovered. drawable is the drawable control itself. stream is the stream on which to draw.

If the use-bitmap-stream property of the control is true, then stream will be the bitmap-stream of the control; otherwise stream will be the visible window of the control.

If use-bitmap-stream is true, then redisplay-event will be called only when the application explicitly calls update-drawable on the drawable; otherwise whatever is currently drawn on the bitmap-stream is used to refresh the visible window as needed.

The default redisplay-event method essentially just calls the on-redisplay handler of the drawable if it has one. The on-redisplay handler is the more typical place to place custom drawing code.

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