5.3 DUIM-Sheets Module
handle-repaint
Generic function
Summary
Implements region repainting for a given sheet class.
Signature
handle-repaint sheet medium region => ()
Arguments
- sheet
- An instance of type
<sheet>. - medium
- An instance of type
<medium>. - region
- An instance of type
<region>.
Values
None
Library
duim-sheets
Module
duim-sheets
Description
Implements region repainting for a given sheet class. Methods on this generic are called by DUIM in an application thread in order to handle repainting a given part of the screen. By calling available methods, it repaints the region of the sheet on medium.
DUIM itself implements no semantically meaningful handle-repaint methods; It is the responsibility of any application to implement all of its own handle-repaint methods. It is also the responsibility of the application to decide the protocol and relationship between all of these methods.
Take care when adding next-method() calls in any handle-repaint methods that you write. Because DUIM itself supplies no built-in methods, you must ensure that you have supplied a valid method yourself. For each sheet class you are handling, you should decide whether a call to next-method is actually required.
The sheet on medium is repainted and region is the region to repaint.