001 /* MetalSeparatorUI.java
002 Copyright (C) 2005 Free Software Foundation, Inc.
003
004 This file is part of GNU Classpath.
005
006 GNU Classpath is free software; you can redistribute it and/or modify
007 it under the terms of the GNU General Public License as published by
008 the Free Software Foundation; either version 2, or (at your option)
009 any later version.
010
011 GNU Classpath is distributed in the hope that it will be useful, but
012 WITHOUT ANY WARRANTY; without even the implied warranty of
013 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
014 General Public License for more details.
015
016 You should have received a copy of the GNU General Public License
017 along with GNU Classpath; see the file COPYING. If not, write to the
018 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
019 02110-1301 USA.
020
021 Linking this library statically or dynamically with other modules is
022 making a combined work based on this library. Thus, the terms and
023 conditions of the GNU General Public License cover the whole
024 combination.
025
026 As a special exception, the copyright holders of this library give you
027 permission to link this library with independent modules to produce an
028 executable, regardless of the license terms of these independent
029 modules, and to copy and distribute the resulting executable under
030 terms of your choice, provided that you also meet, for each linked
031 independent module, the terms and conditions of the license of that
032 module. An independent module is a module which is not derived from
033 or based on this library. If you modify this library, you may extend
034 this exception to your version of the library, but you are not
035 obligated to do so. If you do not wish to do so, delete this
036 exception statement from your version. */
037
038
039 package javax.swing.plaf.metal;
040
041 import java.awt.Color;
042 import java.awt.Graphics;
043 import java.awt.Rectangle;
044
045 import javax.swing.JComponent;
046 import javax.swing.JSeparator;
047 import javax.swing.SwingUtilities;
048 import javax.swing.UIManager;
049 import javax.swing.plaf.ComponentUI;
050 import javax.swing.plaf.basic.BasicSeparatorUI;
051
052 /**
053 * A UI delegate for the {@link JSeparator} component.
054 */
055 public class MetalSeparatorUI
056 extends BasicSeparatorUI
057 {
058
059 // FIXME: maybe replace by a Map of instances when this becomes stateful
060 /** The shared UI instance for MetalSeparatorUIs */
061 private static MetalSeparatorUI instance;
062
063 /**
064 * Constructs a new instance of <code>MetalSeparatorUI</code>.
065 */
066 public MetalSeparatorUI()
067 {
068 super();
069 }
070
071 /**
072 * Returns a shared instance of <code>MetalSeparatorUI</code>.
073 *
074 * @param component the component for which we return an UI instance
075 *
076 * @return A shared instance of <code>MetalSeparatorUI</code>.
077 */
078 public static ComponentUI createUI(JComponent component)
079 {
080 if (instance == null)
081 instance = new MetalSeparatorUI();
082 return instance;
083 }
084
085 /**
086 * The separator is made of two lines. The top line will be
087 * the Metal theme color separatorForeground (or left line if it's vertical).
088 * The bottom or right line will be the Metal theme color
089 * separatorBackground.
090 * The two lines will
091 * be centered inside the bounds box. If the separator is horizontal,
092 * then it will be vertically centered, or if it's vertical, it will
093 * be horizontally centered.
094 *
095 * @param g The Graphics object to paint with
096 * @param c The JComponent to paint.
097 */
098 public void paint(Graphics g, JComponent c)
099 {
100 Rectangle r = new Rectangle();
101 SwingUtilities.calculateInnerArea(c, r);
102 Color saved = g.getColor();
103 Color c1 = UIManager.getColor("Separator.foreground");
104 Color c2 = UIManager.getColor("Separator.background");
105 JSeparator s;
106 if (c instanceof JSeparator)
107 s = (JSeparator) c;
108 else
109 return;
110
111 if (s.getOrientation() == JSeparator.HORIZONTAL)
112 {
113 int midAB = r.height / 2;
114 g.setColor(c1);
115 g.drawLine(r.x, r.y + midAB - 1, r.x + r.width, r.y + midAB - 1);
116
117 g.setColor(c2);
118 g.fillRect(r.x, r.y + midAB, r.x + r.width, r.y + midAB);
119 }
120 else
121 {
122 int midAD = r.height / 2 + r.y;
123 g.setColor(c1);
124 g.drawLine(r.x, r.y, r.x, r.y + r.height);
125
126 g.setColor(c2);
127 g.fillRect(r.x + midAD, r.y + r.height, r.x + midAD, r.y + r.height);
128 }
129 g.setColor(saved);
130 }
131 }