Bugzilla – Full Text Bug Listing
| Summary: | [GEF] RAP repaints the whole SWT canvas on any update | ||
|---|---|---|---|
| Product: | [RT] RAP | Reporter: | Xihui Chen <chenxihui1981> |
| Component: | Incubator | Assignee: | Project Inbox <rap.incubator-inbox> |
| Status: | RESOLVED DUPLICATE | QA Contact: | |
| Severity: | enhancement | ||
| Priority: | P3 | CC: | tbuschto |
| Version: | unspecified | ||
| Target Milestone: | --- | ||
| Hardware: | PC | ||
| OS: | All | ||
| Whiteboard: | |||
The Canvas is currently not able to redraw only parts of the area due to browser-limitations. There are several possible solutions to this, but none are flawless or easy to implement. HTML5 Canva has a method clearRect(x,y,w,h). Is that possible to pass the redraw area to it, and then in draw2d, only repaint the figures in this area? (In reply to comment #1) > The Canvas is currently not able to redraw only parts of the area due to > browser-limitations. There are several possible solutions to this, but none are > flawless or easy to implement. No, because a) it still requires clipping to work properly b) its not available in IE7 and 8 (neither clipping not clearRect) If there were a simple solution to this, we would already have implemented it. I'm not saying there is no solution at all, but none that can be implemented in just a few days. *** This bug has been marked as a duplicate of bug 423952 *** |
Build Identifier: RAP 1.5.0.20120521-1618 When I was monitoring the network traffic of my GEF application on RAP, I found that even a repaint on a small figure in GEF editor will also transfer the painting info for all other figures in the editor even they don't need to be updated at all. I think this is big problem since it will heavily affect the GEF performance on RAP. Looks like the reason is that in RAP the redraw() method of swt.widgets.Control/Canvas ignored the rectangle region and just redraw the whole control whenever it is needed: public void redraw( int x, int y, int width, int height, boolean all ) { checkWidget(); if( width > 0 && height > 0 ) { internalSetRedraw( true ); } } Reproducible: Always