Hi,
I'd recommend not to couple your undo/redo functionality with the Batik,
after all, it's just one component of your application. Instead, use
something like this :
Undoable undoable = new Undoable() {
void do() {
svgCanvas.getUpdateManager().getUpdateRunnableQueue().invokeAndWait(new
Runnable() {
// do it/redo it
});
}
void redo() {
svgCanvas.getUpdateManager().getUpdateRunnableQueue().invokeAndWait(new
Runnable() {
// undo it
});
}
}
YourUndoManager.redo() {
undoable.redo();
}
YourUndoManager.do() {
undoable.do();
}
There may be many more, perhaps, better approaches, but the key is to
separate concerns
Cheers
Sergey Beryozkin
----- Original Message -----
From: "Harm Cuppens" <[EMAIL PROTECTED]>
To: "Batik Users (E-mail)" <[EMAIL PROTECTED]>
Sent: Thursday, March 13, 2003 2:58 PM
Subject: InvokeAndWait problem
> 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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