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SVG 1.2 - forcing a redraw?

From: Andreas Neumann <neumann@karto.baug.ethz.ch>
Date: Mon, 13 Dec 2004 09:52:20 +0100
Message-ID: <41BD5844.8080605@karto.baug.ethz.ch>
To: www-svg@w3.org

Hi all,

With the current SVG viewers, a redraw during a script operation is not 
possible. The UA updates the screen only after the whole script function 
is finished. If you wanted to force a redraw, you would have to use 
setTimeout and give the UA a bit time for redrawing, which is both not 
very save (how much time does a UA need for redrawing) and not very 
elegant, when it comes to programming.

Why would I want a "force redraw"? that's quite common with GUI 
development. F.e. I want a selectionBox to close before the associated 
callback function is called., so it does not look like the GUI does not 
react if the callBack function takes a longer time. Also, if your script 
takes a longer time (e.g. in my map example calculating a 
profile/cross-section) I want to give feedback on the calculation and 
tell the user about the progress of the calculation.

I wonder, with the SVG 1.2 spec enhancements, if it is possible to a 
"force redraw" by script? In chapter 8 about "Progressive Rendering" 
there seems to be a mechanism that allows a  "force-redraw" while 
loading, after node dependencies are resolved. So I guess a 
"force-redraw" mechanism is already in the UA? Could that method be 
exposed, so we can call it from ECMA-Script?

Thanks for any info!

Received on Monday, 13 December 2004 08:52:23 UTC

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