Hello all,
I'm adding undo/redo support to my application (a little SVGEditor). I have
a JSVGCanvas where I can draw my lines, rectangles etc. I can also import
images (or reference them) into the SVG document.
For every action I perform I added undo/redo support.
For the undo/redo action to happen immediately on the canvas, i call the
InvokeAndWait method:
svgCanvas.getUpdateManager().getUpdateRunnableQueue().invokeAndWait(new
Runnable() { undoManager.redo() });
But I have the following problem, I insert an <image> with a xlink to a file
on my disk into the document. I then undo this operation (so the image is
removed again). Now when I try to redo this action, I call the InvokeAndWait
method (to get immediate results on the canvas) which starts the redo code.
But it seems that the class org.apache.batik.bridge.URIResolver calls the
method userAgent.checkLoadExternalResource(purl, pDocURL). This brings me
to the code inside the BridgeUserAgentWrapper inner class of JSVGComponent
where the method calls another InvokeAndWait resulting a total halt of the
program. So I'm in a situation where i'm calling invokeAndWait to run code
that could call invokeAndWait again :-(
I have tried the invokeLater method, but that gave the same results, program
just hangs.
Is there any way to get arround this (besides not using invokeAndWait)? I
really like to have my undo/redo actions to occur immediately without having
to worry about that code calling another invokeAndWait.
Thanks,
Harm
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