Hi again,
ok, maybe i should describe the problem again :-)
What I'm doing is to use JSVGCanvas inside an applet as an svg-viewer inside
the browser. In the applet's init()-method I create a new canvas (MySVGCanvas
is as already explained simply derived from JSVGCanvas in order to have access
to the protected contextBridge-field of the canvas, see Listing 2) and set the
document of the canvas via canvas.setURI().
So what I try to achieve is that after the SVG is loaded into the canvas, the
canvas object itself (the java object) should be bound to the
script-interpreter of the document (just as Thomas Deweese pointed out earlier
in this mail-thread). This should allow me to access the canvas-object from
inside the ecmascript of the SVG as a global variable named mycanvas. This is
done by calling my BindToInterpreter-method of class MySVGCanvas inside the
DocumentLoaderListener. Unfortunately, this throws an exception, because the
internal document-field of the interpreter is not set, it is null (Exception
was posted before). The question is: What am I doing wrong, why does the
interpreter not have a document set (the svg is running perfectly inside the
canvas, it is displayed correctly and the ecmascript is working also). I hope
this disruption of the problem is more useful. All I want to do is bind a
java-object to the interpreter in order to access it from inside ecmascript.
Listing 1: The Applet
public class IntercomApplet extends JApplet {
protected MySVGCanvas canvas;
protected JSObject jso;
public void init() {
// Create a new JSVGCanvas.
canvas = new MySVGCanvas();
getContentPane().add("Center", canvas);
try {
// Set the document by using an URI
canvas.setURI (getWorkflowURL ());
canvas.setDocumentState(JSVGCanvas.ALWAYS_DYNAMIC);
// Set the JSVGCanvas listeners.
canvas.addSVGDocumentLoaderListener(new SVGDocumentLoaderAdapter() {
public void documentLoadingStarted(SVGDocumentLoaderEvent e) {
}
public void documentLoadingCompleted(SVGDocumentLoaderEvent e) {
System.out.println("### Document loaded");
// try to bind the canvas object und name myycanvas to the
script interpreter
canvas.bindObjectToInterpreter("text/ecmascript", "mycanvas",
canvas);
}
});
} catch (Exception ex) {
ex.printStackTrace();
}
}
public String getWorkflowURL (){
String codebase = getCodeBase().toString();
String myurl = codebase + getParameter ("svgurl");
return myurl;
}
}
Listing 2: MyCanvas
public class MySVGCanvas extends JSVGCanvas {
public void bindObjectToInterpreter(String language, String name, Object
obj){
System.out.println("### Binding Object " + obj.toString() + " to
interpreter.");
Interpreter interpreter =
this.bridgeContext.getInterpreter(language);
interpreter.bindObject(name, obj);
}
}
Many thanks,
Roland
-----Ursprüngliche Nachricht-----
Von: Helder Magalhães [mailto:[email protected]]
Gesendet: Freitag, 8. Oktober 2010 07:20
An: [email protected]
Betreff: Re: Batik and XmlHttpRequest / accessing Batik objects from javascript
in svg
> Hi there,
Hi Roland,
> The difficulty is WHEN to bind the object. First try was to simply call it
> in the init()-Method of the Applet after using canvas.setURI(...). However,
> this method is async, so my bind-method will not yet find even a
> bridgeContext (it is null). Therefore, I thought it would be best to bind
> the object AFTER the document is loaded (via setURI) by using something
> like:
<snippet/>
> Currently, this should bind the canvas (later it should be the applet) to
> the name "parentapplet" in the interpreter and I should be able to use this
> name as a global variable in my ecmascript, e.g. like alert(parentapplet);
> Correct? However, an exception is thrown when binding the object:
>
> ### Document loaded
>
> ### Binding Object
> test.MySVGCanvas[,0,36,1000x964,alignmentX=0.0,alignmentY=0.0,border=,flags=288,maximumSize=,minimumSize=java.awt.Dimension[width=100,height=100],preferredSize=java.awt.Dimension[width=200,height=200]]
> to interpreter.
>
> java.lang.RuntimeException: Unknown document
>
> at
> org.apache.batik.bridge.BridgeContext.getInterpreter(BridgeContext.java:558)
[...]
> Any suggestions what I'm doing wrong here?
I haven't quite understood your "document onload" mechanism but there
are a few good examples using "addSVGLoadEventDispatcherListener" and
"addEventListener" with "SVGLoad" [1]. You may also try running that
once the document is already "executing", using a runnable thread [2].
> Many thanks again,
>
> Roland
Hope this helps,
Helder
[1] http://xmlgraphics.apache.org/batik/using/scripting/java.html#Swing
[2] http://xmlgraphics.apache.org/batik/using/scripting/java.html#Threads
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