/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* 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 .
*/
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.RenderingHints;
import java.awt.Toolkit;
import java.awt.event.InputEvent;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.awt.geom.Rectangle2D;
import java.util.ArrayList;
import java.util.List;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.JViewport;
import javax.swing.event.TreeSelectionListener;
import javax.swing.tree.TreePath;
/** This canvas displays accessible objects graphically. Each accessible
object with graphical representation is represented by an
CanvasShape object and has to be added by the
addAccessible member function.
The canvas listens to selection events of the associated JTree and
highlights the first selected node of that tree.
*/
class Canvas
extends JPanel
implements MouseListener, MouseMotionListener, TreeSelectionListener//, Scrollable
{
// This constant can be passed to SetZoomMode to always show the whole screen.
public static final int WHOLE_SCREEN = -1;
public Canvas ()
{
super (true);
maObjects = new java.util.HashMap ();
maNodes = new ArrayList ();
maObjectList = new ArrayList ();
addMouseListener (this);
addMouseMotionListener (this);
maBoundingBox = new Rectangle (0,0,100,100);
maTree = null;
mnHOffset = 0;
mnVOffset = 0;
mnScale = 1;
setShowText(false);
setShowDescriptions (true);
setShowNames (true);
setAntialiasing (true);
maLastWidgetSize = new Dimension (0,0);
}
/** Tell the canvas which tree view to use to highlight accessible
objects.
*/
public void setTree (JTree aTree)
{
if (maTree != null)
maTree.removeTreeSelectionListener (this);
maTree = aTree;
if (maTree != null)
maTree.addTreeSelectionListener (this);
}
public void addNode (AccTreeNode aNode)
{
if (maNodes.indexOf (aNode) == -1)
{
maNodes.add (aNode);
CanvasShape aObject = maObjects.get (aNode);
if (aObject == null)
{
aObject = new CanvasShape (aNode);
// Update bounding box that includes all objects.
if (maObjects.size() == 0)
maBoundingBox = aObject.getBBox();
else
maBoundingBox = maBoundingBox.union (aObject.getBBox());
maObjects.put (aNode, aObject);
maObjectList.add (aObject);
}
repaint ();
}
}
public void removeNode (AccTreeNode aNode)
{
int i = maNodes.indexOf (aNode);
if( i != -1 )
{
Object aObject = maObjects.get(aNode);
maObjectList.remove (aObject);
maObjects.remove (aObject);
maNodes.remove (aNode);
repaint ();
}
}
public void updateNode (AccTreeNode aNode)
{
int i = maNodes.indexOf (aNode);
if (i != -1)
{
CanvasShape aObject = maObjects.get(aNode);
if (aObject != null)
aObject.update();
}
}
public void updateNodeGeometry (AccTreeNode aNode)
{
CanvasShape aObject = maObjects.get(aNode);
if (aObject != null)
aObject.updateGeometry();
}
public void clear ()
{
while (maNodes.size() > 0)
removeNode (maNodes.get(0));
maNodes.clear();
maObjects.clear();
maObjectList.clear();
}
public boolean getShowDescriptions ()
{
return Options.GetBoolean ("ShowDescriptions");
}
public void setShowDescriptions (boolean bNewValue)
{
Options.SetBoolean ("ShowDescriptions", bNewValue);
repaint ();
}
public boolean getShowNames ()
{
return Options.GetBoolean ("ShowNames");
}
public void setShowNames (boolean bNewValue)
{
Options.SetBoolean ("ShowNames", bNewValue);
repaint ();
}
public boolean getAntialiasing ()
{
return Options.GetBoolean ("Antialiasing");
}
public void setAntialiasing (boolean bNewValue)
{
Options.SetBoolean ("Antialiasing", bNewValue);
repaint ();
}
public boolean getShowText ()
{
return Options.GetBoolean ("ShowText");
}
public void setShowText (boolean bNewValue)
{
Options.SetBoolean ("ShowText", bNewValue);
repaint ();
}
public void setZoomMode (int nZoomMode)
{
Options.SetInteger ("ZoomMode", nZoomMode);
repaint ();
}
public int getZoomMode ()
{
return Options.GetInteger ("ZoomMode", WHOLE_SCREEN);
}
public void paintComponent (Graphics g)
{
synchronized (g)
{
super.paintComponent (g);
Graphics2D g2 = (Graphics2D)g;
if (getAntialiasing())
g2.setRenderingHint (RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
else
g2.setRenderingHint (RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_OFF);
setupTransformation ();
// Draw the screen representation to give a hint of the location of the
// accessible object on the screen.
Dimension aScreenSize = Toolkit.getDefaultToolkit().getScreenSize();
Rectangle2D.Double aScreen = new Rectangle2D.Double (
mnHOffset,
mnVOffset,
mnScale*aScreenSize.getWidth(),
mnScale*aScreenSize.getHeight());
// Fill the screen rectangle and draw a frame around it to increase its visibility.
g2.setColor (new Color (250,240,230));
g2.fill (aScreen);
g2.setColor (Color.BLACK);
g2.draw (aScreen);
synchronized (maObjectList)
{
int nCount = maObjectList.size();
boolean bShowDescriptions = getShowDescriptions();
boolean bShowNames = getShowNames();
boolean bShowText = getShowText();
for (int i=0; i 0) && (aScreenSize.getHeight() > 0))
{
if (nZoomMode == WHOLE_SCREEN)
{
// Calculate the scales that would map the screen onto the
// widget in both of the coordinate axes and select the
// smaller
// of the two: it maps the screen onto the widget in both
// axes at the same time.
double nHScale = (aWidgetSize.getWidth() - 10) / aScreenSize.getWidth();
double nVScale = (aWidgetSize.getHeight() - 10) / aScreenSize.getHeight();
if (nHScale < nVScale)
mnScale = nHScale;
else
mnScale = nVScale;
}
else
{
mnScale = nZoomMode / 100.0;
}
// Calculate offsets that center the scaled screen inside the widget.
mnHOffset = (aWidgetSize.getWidth() - mnScale*aScreenSize.getWidth()) / 2.0;
mnVOffset = (aWidgetSize.getHeight() - mnScale*aScreenSize.getHeight()) / 2.0;
if (mnHOffset < 0)
mnHOffset = 0;
if (mnVOffset < 0)
mnVOffset = 0;
setPreferredSize (new Dimension (
(int)(2*mnHOffset + mnScale * aScreenSize.getWidth()),
(int)(2*mnVOffset + mnScale * aScreenSize.getHeight())));
revalidate ();
}
else
{
// In case of a degenerate (not yet initialized?) screen size
// use some meaningless default values.
mnScale = 1;
mnHOffset = 0;
mnVOffset = 0;
}
}
maLastWidgetSize = aWidgetSize;
}
/** Call getAccessibleAt to determine accessible object under mouse.
*/
public void mouseClicked (MouseEvent e)
{
}
public void mousePressed (MouseEvent e)
{
CanvasShape aObjectUnderMouse = FindCanvasShapeUnderMouse (e);
highlightObject (aObjectUnderMouse);
if ((e.getModifiers() & InputEvent.CTRL_MASK) != 0)
{
maTree.expandPath (aObjectUnderMouse.getPath());
}
}
public void mouseReleased (MouseEvent e)
{
}
public void mouseEntered (MouseEvent e)
{
}
public void mouseExited (MouseEvent e)
{
// Deselect currently active object.
if (maActiveObject != null)
{
maActiveObject.unhighlight ();
maActiveObject = null;
repaint ();
}
}
public void mouseDragged (MouseEvent e)
{
}
public void mouseMoved (MouseEvent e)
{
if ((e.getModifiers() & InputEvent.SHIFT_MASK) != 0)
highlightObject (FindCanvasShapeUnderMouse (e));
}
protected CanvasShape FindCanvasShapeUnderMouse (MouseEvent e)
{
int nObjects = maObjects.size();
CanvasShape aObjectUnderMouse = null;
int nCount = maObjectList.size();
for (int i=nCount-1; i>=0; --i)
{
CanvasShape aObject = maObjectList.get(i);
if (aObject != null)
if (aObject.contains (e.getX(),e.getY()))
{
aObjectUnderMouse = aObject;
break;
}
}
return aObjectUnderMouse;
}
protected boolean highlightObject (CanvasShape aNewActiveObject)
{
if (aNewActiveObject != maActiveObject)
{
if (maActiveObject != null)
maActiveObject.unhighlight();
maActiveObject = aNewActiveObject;
if (maActiveObject != null)
{
if (maTree != null)
{
maTree.scrollPathToVisible (maActiveObject.getPath());
maTree.setSelectionPath (maActiveObject.getPath());
maTree.repaint ();
}
maActiveObject.highlight ();
repaint ();
}
return true;
}
else
return false;
}
/** Called when the selection of the tree changes. Highlight the
corresponding graphical representation of the first selected object.
*/
public void valueChanged (javax.swing.event.TreeSelectionEvent event)
{
TreePath aPath = event.getPath();
Object aObject = aPath.getLastPathComponent();
if (aObject instanceof AccTreeNode)
{
CanvasShape aCanvasShape = maObjects.get (aObject);
if (highlightObject (aCanvasShape))
repaint();
}
}
private int
mnXAnchor,
mnYAnchor,
maResizeFlag;
private double
mnHOffset,
mnVOffset,
mnScale;
private CanvasShape
maActiveObject;
private java.util.HashMap
maObjects;
private List
maObjectList;
private List
maNodes;
private Rectangle
maBoundingBox;
private JTree
maTree;
// The size of the widget at the last call of setupTransformation()
private Dimension
maLastWidgetSize;
}