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import java.util.Vector;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.tree.*;
import drafts.com.sun.star.accessibility.XAccessibleContext;
/** This canvas displays accessible objects graphically. Each accessible
object with graphical representation is represented by an
AccessibleObject object and has to be added by the
<member>addAccessible</member> member function.
*/
class Canvas
extends JPanel
implements MouseListener, MouseMotionListener
{
public MessageInterface maMessageDisplay;
public final int nMaximumWidth = 1000;
public final int nMaximumHeight = 1000;
public static boolean bPaintText = false;
public Canvas (MessageInterface aMessageDisplay, JTree aTree)
{
super (true);
maObjects = new Vector ();
maContexts = new Vector ();
addMouseListener (this);
addMouseMotionListener (this);
maBoundingBox = new Rectangle (0,0,100,100);
setPreferredSize (maBoundingBox.getSize());
setSize (nMaximumWidth,nMaximumHeight);
maMessageDisplay = aMessageDisplay;
maTree = aTree;
mnXOffset = 0;
mnYOffset = 0;
mnScaleFactor = 1;
}
public void addAccessible (AccessibleObject aObject)
{
if( maObjects.indexOf( aObject ) == -1 )
{
maObjects.add (aObject);
maContexts.add (aObject.getContext());
}
maBoundingBox = maBoundingBox.union (aObject.getBBox());
}
public void removeAccessible (AccessibleObject aObject)
{
maObjects.remove (aObject);
maContexts.remove (aObject.getContext());
}
public void addContext(XAccessibleContext xContext, TreePath aPath)
{
if( maContexts.indexOf( xContext ) == -1 )
addAccessible( new AccessibleObject( xContext, aPath ) );
}
public void removeContext(XAccessibleContext xContext)
{
int i = maContexts.indexOf( xContext );
if( i != -1 )
removeAccessible( (AccessibleObject)maObjects.elementAt( i ) );
}
public void updateContext(XAccessibleContext aContext)
{
int i = maContexts.indexOf( aContext );
if( i != -1 )
((AccessibleObject)maObjects.elementAt( i )).update();
}
public void clear ()
{
maObjects.clear();
maContexts.clear();
}
public void paintComponent (Graphics g)
{
Rectangle r = g.getClipBounds();
g.clearRect (r.x,r.y,r.width,r.height);
// Recalculate scale and offset so that all accessible objects fit
// into the area specified by nMaximum(Width,Height)
double nXScale = 1,
nYScale = 1;
if (maBoundingBox.getWidth() > nMaximumWidth)
nXScale = 1.0 * nMaximumWidth / maBoundingBox.getWidth();
if (maBoundingBox.getHeight() > nMaximumHeight)
nYScale = 1.0 * nMaximumHeight / maBoundingBox.getHeight();
if (nXScale < nYScale)
mnScaleFactor = nXScale;
else
mnScaleFactor = nYScale;
int n = maObjects.size();
for (int i=0; i<n; i++)
((AccessibleObject)(maObjects.elementAt(i))).paint (
g,
(int)-maBoundingBox.getX(),
(int)-maBoundingBox.getY(),
mnScaleFactor);
}
public void mouseClicked (MouseEvent e)
{
}
public void mousePressed (MouseEvent e)
{
mnXAnchor = e.getX();
mnYAnchor = e.getY();
int n = maObjects.size();
for (int i=0; i<n; i++)
{
AccessibleObject aObject = (AccessibleObject)(maObjects.elementAt(i));
if (aObject != null && aObject.contains (e.getX(),e.getY()))
{
maActiveObject = aObject;
maResizeFlag = aObject.getResizeFlag (e.getX(),e.getY());
}
}
}
public void mouseReleased (MouseEvent e)
{
}
public void mouseEntered (MouseEvent e)
{
}
public void mouseExited (MouseEvent e)
{
int n = maObjects.size();
for (int i=0; i<n; i++)
{
AccessibleObject aObject = (AccessibleObject)(maObjects.elementAt(i));
if (aObject != null)
aObject.deselect ();
}
repaint ();
}
public void mouseDragged (MouseEvent e)
{
if (maActiveObject != null)
{
int dx = e.getX() - mnXAnchor;
int dy = e.getY() - mnYAnchor;
if ((e.getModifiers() & MouseEvent.BUTTON1_MASK) != 0)
{
maActiveObject.translate (dx,dy);
}
else if ((e.getModifiers() & MouseEvent.BUTTON2_MASK) != 0)
{
maActiveObject.resize (maResizeFlag, dx,dy);
}
mnXAnchor = e.getX();
mnYAnchor = e.getY();
repaint ();
}
}
public void mouseMoved (MouseEvent e)
{
maActiveObject = null;
for (int i=0; i<maObjects.size(); i++)
{
AccessibleObject aObject = (AccessibleObject)(maObjects.elementAt(i));
if (aObject != null)
{
aObject.deselect ();
if (aObject != null)
if (aObject.contains (e.getX(),e.getY()))
{
maActiveObject = aObject;
}
}
}
if (maActiveObject != null)
{
maActiveObject.select ();
maMessageDisplay.message ("mouse moved to " + e.getX() + "," + e.getY() + ": "
+maActiveObject.toString());
System.out.println ("path: " + maActiveObject.getPath());
if (maTree != null)
{
maTree.scrollPathToVisible (maActiveObject.getPath());
maTree.repaint ();
}
}
repaint ();
}
protected int
mnXAnchor,
mnYAnchor,
maResizeFlag,
mnXOffset,
mnYOffset;
protected double
mnScaleFactor;
protected AccessibleObject
maActiveObject;
protected Vector
maObjects,
maContexts;
protected Rectangle
maBoundingBox;
protected JTree
maTree;
}
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