How to prevent the automatic full-white repainting of an AWT Frame?
Using Java 1.6.0, Windows XP, 1.6.0-b105 Client VM I have the following problem:
I made a double buffered AWT frame. But it still flashes sometimes. It gives one flash about 6 seconds after start of application. There seems to be an incoming event "for no discernible reason". I have overridden all paint/repaint/update methods in my Frame sub class.
These unwanted flashes are caused by the AWT painting the frame in white and then calling paint.
I may have caught these weird calls:
The good/normal case looks like:
java.lang.Exception: Stack trace
at java.lang.Thread.dumpStack(Thread.java:1206)
at xed.xed_Frame.paint(xed_Frame.java:125)
at xed.xed_Frame.update(xed_Frame.java:119)
at sun.awt.RepaintArea.updateComponent(RepaintArea.java:239)
at sun.awt.RepaintArea.paint(RepaintArea.java:216)
at sun.awt.windows.WComponentPeer.handleEvent(WComponentPeer.java:301)
at java.awt.Component.dispatchEventImpl(Component.java:4486)
at java.awt.Container.dispatchEventImpl(Container.java:2116)
at java.awt.Window.dispatchEventImpl(Window.java:2429)
at java.awt.Component.dispatchEvent(Component.java:4240)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)
The differences in the bad case: (Not all traces of this kind cause the flashing. But after all flashes there seems to be such a trace.)
at xed.xed_Frame.paint(xed_Frame.java:125)
at sun.awt.RepaintArea.paintComponent(RepaintArea.java:248)
at sun.awt.RepaintArea.paint(RepaintArea.java:224)
at sun.awt.windows.WComponentPeer.handleEvent(WComponentPeer.java:301)
So how do I stop these unwanted white redraws of the Frame?
Accidentally found the answer:
System.setProperty("sun.awt.noerasebackground", "true");
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