001 /**
002 * ========================================
003 * JCommon : a free Java report library
004 * ========================================
005 *
006 * Project Info: http://www.jfree.org/jcommon/
007 * Project Lead: Thomas Morgner;
008 *
009 * (C) Copyright 2000-2006, by Object Refinery Limited and Contributors.
010 *
011 * This library is free software; you can redistribute it and/or modify it under the terms
012 * of the GNU Lesser General Public License as published by the Free Software Foundation;
013 * either version 2.1 of the License, or (at your option) any later version.
014 *
015 * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
016 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
017 * See the GNU Lesser General Public License for more details.
018 *
019 * You should have received a copy of the GNU Lesser General Public License along with this
020 * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
021 * Boston, MA 02111-1307, USA.
022 *
023 * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
024 * in the United States and other countries.]
025 *
026 * ------------
027 * DrawablePanel.java
028 * ------------
029 * (C) Copyright 2002-2006, by Object Refinery Limited.
030 *
031 * Original Author: Thomas Morgner;
032 * Contributor(s): -;
033 *
034 * $Id: DrawablePanel.java,v 1.2 2006/11/17 20:09:50 taqua Exp $
035 *
036 * Changes
037 * -------
038 *
039 *
040 */
041 package org.jfree.ui;
042
043 import java.awt.Graphics;
044 import java.awt.Graphics2D;
045 import java.awt.Dimension;
046 import java.awt.geom.Rectangle2D;
047 import javax.swing.JPanel;
048
049 import org.jfree.util.Log;
050
051 /**
052 * A component, that accepts a drawable and which draws that drawable.
053 *
054 * @author Thomas Morgner
055 */
056 public class DrawablePanel extends JPanel
057 {
058 private Drawable drawable;
059
060 public DrawablePanel()
061 {
062 setOpaque(false);
063 }
064
065 public Drawable getDrawable()
066 {
067 return drawable;
068 }
069
070 public void setDrawable(final Drawable drawable)
071 {
072 this.drawable = drawable;
073 revalidate();
074 repaint();
075 }
076
077 /**
078 * If the <code>preferredSize</code> has been set to a non-<code>null</code>
079 * value just returns it. If the UI delegate's <code>getPreferredSize</code>
080 * method returns a non <code>null</code> value then return that; otherwise
081 * defer to the component's layout manager.
082 *
083 * @return the value of the <code>preferredSize</code> property
084 * @see #setPreferredSize
085 * @see javax.swing.plaf.ComponentUI
086 */
087 public Dimension getPreferredSize()
088 {
089 if (drawable instanceof ExtendedDrawable)
090 {
091 final ExtendedDrawable ed = (ExtendedDrawable) drawable;
092 return ed.getPreferredSize();
093 }
094 return super.getPreferredSize();
095 }
096
097 /**
098 * If the minimum size has been set to a non-<code>null</code> value just
099 * returns it. If the UI delegate's <code>getMinimumSize</code> method
100 * returns a non-<code>null</code> value then return that; otherwise defer to
101 * the component's layout manager.
102 *
103 * @return the value of the <code>minimumSize</code> property
104 * @see #setMinimumSize
105 * @see javax.swing.plaf.ComponentUI
106 */
107 public Dimension getMinimumSize()
108 {
109 if (drawable instanceof ExtendedDrawable)
110 {
111 final ExtendedDrawable ed = (ExtendedDrawable) drawable;
112 return ed.getPreferredSize();
113 }
114 return super.getMinimumSize();
115 }
116
117 /**
118 * Returns true if this component is completely opaque.
119 * <p/>
120 * An opaque component paints every pixel within its rectangular bounds. A
121 * non-opaque component paints only a subset of its pixels or none at all,
122 * allowing the pixels underneath it to "show through". Therefore, a
123 * component that does not fully paint its pixels provides a degree of
124 * transparency.
125 * <p/>
126 * Subclasses that guarantee to always completely paint their contents should
127 * override this method and return true.
128 *
129 * @return true if this component is completely opaque
130 * @see #setOpaque
131 */
132 public boolean isOpaque()
133 {
134 if (drawable == null)
135 {
136 return false;
137 }
138 return super.isOpaque();
139 }
140
141 /**
142 * Calls the UI delegate's paint method, if the UI delegate is
143 * non-<code>null</code>. We pass the delegate a copy of the
144 * <code>Graphics</code> object to protect the rest of the paint code from
145 * irrevocable changes (for example, <code>Graphics.translate</code>).
146 * <p/>
147 * If you override this in a subclass you should not make permanent changes to
148 * the passed in <code>Graphics</code>. For example, you should not alter the
149 * clip <code>Rectangle</code> or modify the transform. If you need to do
150 * these operations you may find it easier to create a new
151 * <code>Graphics</code> from the passed in <code>Graphics</code> and
152 * manipulate it. Further, if you do not invoker super's implementation you
153 * must honor the opaque property, that is if this component is opaque, you
154 * must completely fill in the background in a non-opaque color. If you do not
155 * honor the opaque property you will likely see visual artifacts.
156 * <p/>
157 * The passed in <code>Graphics</code> object might have a transform other
158 * than the identify transform installed on it. In this case, you might get
159 * unexpected results if you cumulatively apply another transform.
160 *
161 * @param g the <code>Graphics</code> object to protect
162 * @see #paint
163 * @see javax.swing.plaf.ComponentUI
164 */
165 protected void paintComponent(Graphics g)
166 {
167 super.paintComponent(g);
168 if (drawable == null)
169 {
170 return;
171 }
172
173 final Graphics2D g2 = (Graphics2D) g.create
174 (0, 0, getWidth(), getHeight());
175
176 drawable.draw(g2, new Rectangle2D.Double(0, 0, getWidth(), getHeight()));
177 g2.dispose();
178 }
179
180 }