001    /* MetalCheckBoxIcon.java -- An icon for JCheckBoxes in the Metal L&F
002       Copyright (C) 2005, 2006 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.Component;
042    import java.awt.Graphics;
043    import java.io.Serializable;
044    
045    import javax.swing.AbstractButton;
046    import javax.swing.Icon;
047    import javax.swing.SwingConstants;
048    import javax.swing.UIManager;
049    import javax.swing.plaf.UIResource;
050    
051    /**
052     * An {@link Icon} used by the {@link MetalCheckBoxUI} class.
053     *
054     * @author Roman Kennke (roman@kennke.org)
055     */
056    public class MetalCheckBoxIcon
057      implements Icon, UIResource, Serializable
058    {
059    
060      /** Used to paint the border of the icon. */
061      MetalBorders.ButtonBorder border;
062    
063      /**
064       * Creates a new MetalCheckBoxIcon instance.
065       */
066      public MetalCheckBoxIcon()
067      {
068        border = new MetalBorders.ButtonBorder();
069      }
070    
071      /**
072       * Draws the check in the CheckBox.
073       *
074       * @param c the component to draw on
075       * @param g the Graphics context to draw with
076       * @param x the X position
077       * @param y the Y position
078       */
079      protected void drawCheck(Component c, Graphics g, int x, int y)
080      {
081        if (c.isEnabled())
082          g.setColor(MetalLookAndFeel.getBlack());
083        else
084          g.setColor(MetalLookAndFeel.getControlDisabled());
085        g.drawLine(3 + x, 5 + y, 3 + x, 9 + y);
086        g.drawLine(4 + x, 5 + y, 4 + x, 9 + y);
087        g.drawLine(5 + x, 7 + y, 9 + x, 3 + y);
088        g.drawLine(5 + x, 8 + y, 9 + x, 4 + y);
089      }
090    
091      /**
092       * Returns the size (both X and Y) of the checkbox icon.
093       *
094       * @return the size of the checkbox icon
095       */
096      protected int getControlSize()
097      {
098        return 13;
099      }
100    
101      /**
102       * Returns the width of the icon in pixels.
103       *
104       * @return the width of the icon in pixels
105       */
106      public int getIconWidth()
107      {
108        return getControlSize();
109      }
110    
111      /**
112       * Returns the height of the icon in pixels.
113       *
114       * @return the height of the icon in pixels
115       */
116      public int getIconHeight()
117      {
118        return getControlSize();
119      }
120    
121      /**
122       * Paints the icon. This first paints the border of the CheckBox and
123       * if the CheckBox is selected it calls {@link #drawCheck} to draw
124       * the check.
125       *
126       * @param c the Component to draw on (gets casted to JCheckBox)
127       * @param g the Graphics context to draw with
128       * @param x the X position
129       * @param y the Y position
130       */
131      public void paintIcon(Component c, Graphics g, int x, int y)
132      {
133        if (UIManager.get("CheckBox.gradient") != null)
134          MetalUtils.paintGradient(g, x, y, getIconWidth(), getIconHeight(),
135                                   SwingConstants.VERTICAL, "CheckBox.gradient");
136        border.paintBorder(c, g, x, y, getIconWidth(), getIconHeight());
137        
138        AbstractButton b = (AbstractButton) c;
139        if (b.isSelected())
140          drawCheck(b, g, x, y);
141      }
142    }