content: /**
   * ========================================
   * JCommon : a free Java report library
   * ========================================
   *
   * Project Info:  http://www.jfree.org/jcommon/
   * Project Lead:  Thomas Morgner;
   *
   * (C) Copyright 2000-2006, by Object Refinery Limited and Contributors.
   *
   * This library is free software; you can redistribute it and/or modify it under the terms
   * of the GNU Lesser General Public License as published by the Free Software Foundation;
   * either version 2.1 of the License, or (at your option) any later version.
   *
   * This library 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 Lesser General Public License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public License along with this
   * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
   * Boston, MA 02111-1307, USA.
   *
   * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
   * in the United States and other countries.]
   *
   * ------------
   * DrawablePanel.java
   * ------------
   * (C) Copyright 2002-2006, by Object Refinery Limited.
   *
   * Original Author:  Thomas Morgner;
   * Contributor(s):   -;
   *
   * $Id: DrawablePanel.java,v 1.4 2008/09/10 09:25:09 mungady Exp $
   *
   * Changes
   * -------
   *
   *
   */
  package org.jfree.ui;
  
  import java.awt.Dimension;
  import java.awt.Graphics;
  import java.awt.Graphics2D;
  import java.awt.geom.Rectangle2D;
  import javax.swing.JPanel;
  
  /**
   * A component, that accepts a drawable and which draws that drawable.
   *
   * @author Thomas Morgner
   */
  public class DrawablePanel extends JPanel
  {
    private Drawable drawable;
  
    /**
     * Creates a new instance.
     */
    public DrawablePanel()
    {
      setOpaque(false);
    }
  
    /**
     * Returns the drawable item.
     *
     * @return The drawable item.
     */
    public Drawable getDrawable()
    {
      return this.drawable;
    }
  
    /**
     * Sets the drawable item.
     *
     * @param drawable  the drawable item.
     */
    public void setDrawable(final Drawable drawable)
    {
      this.drawable = drawable;
      revalidate();
      repaint();
    }
  
    /**
     * If the <code>preferredSize</code> has been set to a non-<code>null</code>
     * value just returns it. If the UI delegate's <code>getPreferredSize</code>
     * method returns a non <code>null</code> value then return that; otherwise
     * defer to the component's layout manager.
     *
     * @return the value of the <code>preferredSize</code> property
     * @see #setPreferredSize
     * @see javax.swing.plaf.ComponentUI
     */
    public Dimension getPreferredSize()
    {
      if (this.drawable instanceof ExtendedDrawable)
      {
        final ExtendedDrawable ed = (ExtendedDrawable) this.drawable;
        return ed.getPreferredSize();
      }
      return super.getPreferredSize();
    }
  
    /**
     * If the minimum size has been set to a non-<code>null</code> value just
     * returns it.  If the UI delegate's <code>getMinimumSize</code> method
     * returns a non-<code>null</code> value then return that; otherwise defer to
     * the component's layout manager.
     *
     * @return the value of the <code>minimumSize</code> property
     * @see #setMinimumSize
     * @see javax.swing.plaf.ComponentUI
     */
    public Dimension getMinimumSize()
    {
      if (this.drawable instanceof ExtendedDrawable)
      {
        final ExtendedDrawable ed = (ExtendedDrawable) this.drawable;
        return ed.getPreferredSize();
      }
      return super.getMinimumSize();
    }
  
    /**
     * Returns true if this component is completely opaque.
     * <p/>
     * An opaque component paints every pixel within its rectangular bounds. A
     * non-opaque component paints only a subset of its pixels or none at all,
     * allowing the pixels underneath it to "show through".  Therefore, a
     * component that does not fully paint its pixels provides a degree of
     * transparency.
     * <p/>
     * Subclasses that guarantee to always completely paint their contents should
     * override this method and return true.
     *
     * @return true if this component is completely opaque
     * @see #setOpaque
     */
    public boolean isOpaque()
    {
      if (this.drawable == null)
      {
        return false;
      }
      return super.isOpaque();
    }
  
    /**
     * Calls the UI delegate's paint method, if the UI delegate is
     * non-<code>null</code>.  We pass the delegate a copy of the
     * <code>Graphics</code> object to protect the rest of the paint code from
     * irrevocable changes (for example, <code>Graphics.translate</code>).
     * <p/>
     * If you override this in a subclass you should not make permanent changes to
     * the passed in <code>Graphics</code>. For example, you should not alter the
     * clip <code>Rectangle</code> or modify the transform. If you need to do
     * these operations you may find it easier to create a new
     * <code>Graphics</code> from the passed in <code>Graphics</code> and
     * manipulate it. Further, if you do not invoker super's implementation you
     * must honor the opaque property, that is if this component is opaque, you
     * must completely fill in the background in a non-opaque color. If you do not
     * honor the opaque property you will likely see visual artifacts.
     * <p/>
     * The passed in <code>Graphics</code> object might have a transform other
     * than the identify transform installed on it.  In this case, you might get
     * unexpected results if you cumulatively apply another transform.
     *
     * @param g the <code>Graphics</code> object to protect
     * @see #paint
     * @see javax.swing.plaf.ComponentUI
     */
    protected void paintComponent(Graphics g)
    {
      super.paintComponent(g);
      if (this.drawable == null)
      {
        return;
      }
  
      final Graphics2D g2 = (Graphics2D) g.create
              (0, 0, getWidth(), getHeight());
  
      this.drawable.draw(g2, new Rectangle2D.Double(0, 0, getWidth(), getHeight()));
      g2.dispose();
    }
  
  }
  