I am creating a simple svg application using JSVGCanvas. I am trying to add
mouse event listeners to the svg elements (rect, group etc.). I follow the
standard routine, using EventTarget.addEventListener(). My listeners are
able to receive mouse events correctly, but the MouseEvent.getButton() does
not return the correct value (which should be 0 for left, 1 for middle, 2
for right i think). To be more specific, no matter which button i pressed, i
always get 1. I try to look in depth and i think there might be some mouse
or key mask problems.
The following is the program that can reproduce the problem. You can do a
quick test by copy and paste, and compile it with batik 1.7 and its required
jar files. And try it again with the batik version 1.6. From what i got
batik 1.6 will generate the right mouse button, but in 1.7,
MouseEvent.getButton() always return 1.
//BEGINNING OF CODE
/*
* Copyright (c) 2005 - 2007 PeterHi
* All rights reserved.
*
* Copyright (c) 2005 - 2007 by Hai Yun Tao
* All rights reserved.
*
*/
package com.peterhi.err;
import java.awt.BorderLayout;
import java.awt.Dimension;
import org.apache.batik.dom.svg12.SVG12DOMImplementation;
import org.apache.batik.swing.JSVGCanvas;
import org.apache.batik.swing.gvt.GVTTreeRendererEvent;
import org.apache.batik.swing.gvt.GVTTreeRendererListener;
import org.w3c.dom.Element;
import org.w3c.dom.events.Event;
import org.w3c.dom.events.EventListener;
import org.w3c.dom.events.EventTarget;
import org.w3c.dom.events.MouseEvent;
import org.w3c.dom.svg.SVGDocument;
public class Main extends javax.swing.JFrame
implements GVTTreeRendererListener,
EventListener {
// the canvas
private JSVGCanvas canvas;
// the rect you can click, used to test mouse events
private Element rect;
public Main() {
initComponents();
initComponentsEx();
}
private void initComponentsEx() {
// Set up canvas
canvas = new JSVGCanvas();
canvas.setPreferredSize(new Dimension(640, 480));
canvas.addGVTTreeRendererListener(this);
add(canvas, BorderLayout.CENTER);
try {
// Create a document
String ns = SVG12DOMImplementation.SVG_NAMESPACE_URI;
SVG12DOMImplementation impl = (SVG12DOMImplementation)
SVG12DOMImplementation.getDOMImplementation();
SVGDocument doc = (SVGDocument )
impl.createDocument(ns, "svg", null);
// Create a rectangle to reproduce the error
rect = doc.createElementNS(ns, "rect");
rect.setAttributeNS(null, "x", "0");
rect.setAttributeNS(null, "y", "0");
rect.setAttributeNS(null, "width", "1000");
rect.setAttributeNS(null, "height", "1000");
rect.setAttributeNS(null, "style", "fill:red");
// put it into document
doc.getRootElement().appendChild(rect);
// set document to the canvas
canvas.setDocumentState(JSVGCanvas.ALWAYS_DYNAMIC);
canvas.setDocument(doc); // I think gvt renderer
// will start working
} catch (Exception ex) {
ex.printStackTrace();
}
pack();
}
// <editor-fold defaultstate="collapsed" desc=" Generated Code ">
private void initComponents() {
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
}// </editor-fold>
public static void main(String[] args) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new Main().setVisible(true);
}
});
}
// Variables declaration - do not modify
// End of variables declaration
public void gvtRenderingPrepare(GVTTreeRendererEvent e) { }
public void gvtRenderingStarted(GVTTreeRendererEvent e) { }
public void gvtRenderingCompleted(GVTTreeRendererEvent e) {
System.out.println("render completed, adding event listeners");
// I appended my listener here, which works perfectly
// back in batik 1.6
EventTarget et = (EventTarget )rect;
// subscribe listener here, take mouse down as
// an example
et.addEventListener("mousedown", this, false);
}
public void gvtRenderingCancelled(GVTTreeRendererEvent e) { }
public void gvtRenderingFailed(GVTTreeRendererEvent e) { }
public void handleEvent(Event evt) {
// Prove that we are able to received mouse down event
System.out.println("mouse down trigerred!!!");
// Here is where the problem comes
// Check the value of MouseEvent.getButton(), which,
// no matter what button is pressed, will always show 1
MouseEvent me = (MouseEvent )evt;
short button = me.getButton();
System.out.println("button pressed: " + button);
}
}
// END OF CODE
FYI:
Batik Version: Batik 1.7 Beta 1 (This problem does not occur in Batik 1.6)
Program IDE: NetBeans IDE 5.5
OS: Windows Server 2003
JDK version: Java SE Version 1.5.0 (build 1.5.0_11-b03)
Mouse: standard mouse with left, right, and a scrollable middle button
Please help me solve the problem as soon as possible. Thanks in advance.
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