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//******************************************************************************
//
// File: DisplayableList.java
// Package: edu.rit.swing
// Unit: Class edu.rit.swing.DisplayableList
//
// This Java source file is copyright (C) 2002-2005 by Alan Kaminsky. All rights
// reserved. For further information, contact the author, Alan Kaminsky, at
// ark@cs.rit.edu.
//
// This Java source file is part of the Parallel Java Library ("PJ"). PJ is free
// software; you can redistribute it and/or modify it under the terms of the GNU
// General Public License as published by the Free Software Foundation; either
// version 3 of the License, or (at your option) any later version.
//
// PJ is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
// A PARTICULAR PURPOSE. See the GNU General Public License for more details.
//
// Linking this library statically or dynamically with other modules is making a
// combined work based on this library. Thus, the terms and conditions of the
// GNU General Public License cover the whole combination.
//
// As a special exception, the copyright holders of this library give you
// permission to link this library with independent modules to produce an
// executable, regardless of the license terms of these independent modules, and
// to copy and distribute the resulting executable under terms of your choice,
// provided that you also meet, for each linked independent module, the terms
// and conditions of the license of that module. An independent module is a
// module which is not derived from or based on this library. If you modify this
// library, you may extend this exception to your version of the library, but
// you are not obligated to do so. If you do not wish to do so, delete this
// exception statement from your version.
//
// A copy of the GNU General Public License is provided in the file gpl.txt. You
// may also obtain a copy of the GNU General Public License on the World Wide
// Web at http://www.gnu.org/licenses/gpl.html.
//
//******************************************************************************
package edu.rit.swing;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.geom.Rectangle2D;
import java.util.Vector;
/**
* Class DisplayableList provides an object that combines a list of separate
* {@link Displayable </CODE>Displayable<CODE>} objects into a single
* displayable object.
* <P>
* <I>Note:</I> Class DisplayableList is multiple thread safe.
*
* @author Alan Kaminsky
* @version 20-Jul-2006
*/
public class DisplayableList
implements Displayable
{
// Hidden data members.
private Vector<Displayable> myDisplayList = new Vector<Displayable>();
private static final Rectangle2D EMPTY = new Rectangle2D.Double();
private Rectangle2D myBoundingBox = EMPTY;
private Paint myBackgroundPaint = Color.white;
// Exported constructors.
/**
* Construct a new, empty displayable list.
*/
public DisplayableList()
{
}
// Exported operations.
/**
* Clear this displayable list.
*/
public synchronized void clear()
{
myDisplayList.clear();
myBoundingBox = EMPTY;
myBackgroundPaint = Color.white;
}
/**
* Add the given displayable object to the end of this displayable list.
*
* @param theDisplayable Displayable object.
*
* @exception NullPointerException
* (unchecked exception) Thrown if <TT>theDisplayable</TT> is null.
*/
public synchronized void add
(Displayable theDisplayable)
{
if (theDisplayable == null)
{
throw new NullPointerException();
}
if (myDisplayList.isEmpty())
{
myBackgroundPaint = theDisplayable.getBackgroundPaint();
}
myBoundingBox =
myBoundingBox.createUnion (theDisplayable.getBoundingBox());
myDisplayList.add (theDisplayable);
}
// Exported operations implemented from interface Drawable.
/**
* Draw this drawable object in the given graphics context. Upon return from
* this method, the given graphics context's state (color, font, transform,
* clip, and so on) is the same as it was upon entry to this method.
* <P>
* The displayable objects in this displayable list are drawn in the order
* they were added.
*
* @param g2d 2-D graphics context.
*/
public synchronized void draw
(Graphics2D g2d)
{
for (Displayable item : myDisplayList)
{
item.draw (g2d);
}
}
// Exported operations implemented from interface Displayable.
/**
* Returns this displayable object's bounding box. This is the smallest
* rectangle that encloses all of this displayable object.
* <P>
* This method returns the union of the bounding boxes of the displayable
* objects in this displayable list. If this displayable list is empty, an
* empty rectangle is returned.
*/
public synchronized Rectangle2D getBoundingBox()
{
return myBoundingBox;
}
/**
* Returns this displayable object's background paint.
* <P>
* This method returns the background paint of the first displayable object
* in this displayable list. If this displayable list is empty, the color
* white is returned.
*/
public synchronized Paint getBackgroundPaint()
{
return myBackgroundPaint;
}
}
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