001/* MetalSeparatorUI.java
002   Copyright (C) 2005 Free Software Foundation, Inc.
003
004This file is part of GNU Classpath.
005
006GNU Classpath is free software; you can redistribute it and/or modify
007it under the terms of the GNU General Public License as published by
008the Free Software Foundation; either version 2, or (at your option)
009any later version.
010
011GNU Classpath is distributed in the hope that it will be useful, but
012WITHOUT ANY WARRANTY; without even the implied warranty of
013MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014General Public License for more details.
015
016You should have received a copy of the GNU General Public License
017along with GNU Classpath; see the file COPYING.  If not, write to the
018Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
01902110-1301 USA.
020
021Linking this library statically or dynamically with other modules is
022making a combined work based on this library.  Thus, the terms and
023conditions of the GNU General Public License cover the whole
024combination.
025
026As a special exception, the copyright holders of this library give you
027permission to link this library with independent modules to produce an
028executable, regardless of the license terms of these independent
029modules, and to copy and distribute the resulting executable under
030terms of your choice, provided that you also meet, for each linked
031independent module, the terms and conditions of the license of that
032module.  An independent module is a module which is not derived from
033or based on this library.  If you modify this library, you may extend
034this exception to your version of the library, but you are not
035obligated to do so.  If you do not wish to do so, delete this
036exception statement from your version. */
037
038
039package javax.swing.plaf.metal;
040
041import java.awt.Color;
042import java.awt.Graphics;
043import java.awt.Rectangle;
044
045import javax.swing.JComponent;
046import javax.swing.JSeparator;
047import javax.swing.SwingUtilities;
048import javax.swing.UIManager;
049import javax.swing.plaf.ComponentUI;
050import javax.swing.plaf.basic.BasicSeparatorUI;
051
052/**
053 * A UI delegate for the {@link JSeparator} component.
054 */
055public 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}