AOO410/main/accessibility/workben/org/openoffice/accessibility/awb/canvas/MouseObserver.java

/**************************************************************
 * 
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 * 
 *************************************************************/

package org.openoffice.accessibility.awb.canvas;

import java.awt.Dimension;
import java.awt.event.InputEvent;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.util.Iterator;
import javax.swing.tree.TreePath;


/** Observe the mouse and highlight shapes of the canvas when clicked.
*/
public class MouseObserver
    implements MouseListener, 
               MouseMotionListener
{
	public MouseObserver (Canvas aCanvas)
	{
		maCanvas = aCanvas;
		maCanvas.addMouseListener (this);
        maCanvas.addMouseMotionListener (this);
	}


	public void SetTree (javax.swing.JTree aTree)
    {
		maTree = aTree;
	}

    public void mouseClicked (MouseEvent e)
    {}

    public void mousePressed (MouseEvent e)
    {
        CanvasShape aObjectUnderMouse = FindCanvasShapeUnderMouse (e);
        maTree.clearSelection();
        if (aObjectUnderMouse != null)
        {
            TreePath aPath = aObjectUnderMouse.getNodePath();
            if ((e.getModifiers() & InputEvent.CTRL_MASK) != 0)
                maTree.expandPath (aPath);
            // Selecting the entry will eventually highlight the shape.
            maTree.setSelectionPath (aPath);
            maTree.makeVisible (aPath);
        }
    }

    public void mouseReleased (MouseEvent e)
    {}

    public void mouseEntered (MouseEvent e)
    {}

    public void mouseExited (MouseEvent e)
    {}

    public void mouseDragged (MouseEvent e)
    {
    }

    public void mouseMoved (MouseEvent e)
    {
        if ((e.getModifiers() & InputEvent.SHIFT_MASK) != 0)
            maCanvas.HighlightObject (FindCanvasShapeUnderMouse (e));
    }


	/** Search for the smallest shape that contains the mouse position.  
	*/
    protected CanvasShape FindCanvasShapeUnderMouse (MouseEvent e)
    {
		Dimension aSmallestSize = null;
        Iterator maShapeIterator = maCanvas.GetShapeIterator();
        CanvasShape aShapeUnderMouse = null;
		while (maShapeIterator.hasNext())
        {
            CanvasShape aShape = (CanvasShape)maShapeIterator.next();
            if (aShape != null)
                if (aShape.Contains (e.getX(),e.getY()))
				{
					if (aShapeUnderMouse == null)
					{
						aSmallestSize = aShape.GetSize();
						aShapeUnderMouse = aShape;
					}
					else
					{
						Dimension aSize = aShape.GetSize();
						if (aSize.getWidth()<aSmallestSize.getWidth()
							|| aSize.getHeight()<aSmallestSize.getHeight())
						{
							aSmallestSize = aSize;
							aShapeUnderMouse = aShape;
						}
					}
				}
        }
        return aShapeUnderMouse;
    }

	private Canvas maCanvas;
	private javax.swing.JTree maTree;
}