gomp-20050608-branch/libjava/classpath/javax/swing/plaf/metal/MetalSplitPaneDivider.java

   1 /* MetalSplitPaneDivider.java
   2 Copyright (C) 2005 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Classpath.
   5
   6 GNU Classpath is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Classpath is distributed in the hope that it will be useful, but
  12 WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Classpath; see the file COPYING.  If not, write to the
  18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19 02110-1301 USA.
  20
  21 Linking this library statically or dynamically with other modules is
  22 making a combined work based on this library.  Thus, the terms and
  23 conditions of the GNU General Public License cover the whole
  24 combination.
  25
  26 As a special exception, the copyright holders of this library give you
  27 permission to link this library with independent modules to produce an
  28 executable, regardless of the license terms of these independent
  29 modules, and to copy and distribute the resulting executable under
  30 terms of your choice, provided that you also meet, for each linked
  31 independent module, the terms and conditions of the license of that
  32 module.  An independent module is a module which is not derived from
  33 or based on this library.  If you modify this library, you may extend
  34 this exception to your version of the library, but you are not
  35 obligated to do so.  If you do not wish to do so, delete this
  36 exception statement from your version. */
  37
  38 package javax.swing.plaf.metal;
  39
  40 import java.awt.Color;
  41 import java.awt.Component;
  42 import java.awt.Container;
  43 import java.awt.Dimension;
  44 import java.awt.Graphics;
  45 import java.awt.LayoutManager;
  46 import java.awt.Point;
  47
  48 import javax.swing.JSplitPane;
  49 import javax.swing.SwingConstants;
  50 import javax.swing.plaf.basic.BasicArrowButton;
  51 import javax.swing.plaf.basic.BasicSplitPaneDivider;
  52
  53 /**
  54  * The divider that is used by the MetalSplitPaneUI.
  55  *
  56  * @author Roman Kennke (roman@kennke.org)
  57  *
  58  */
  59 class MetalSplitPaneDivider extends BasicSplitPaneDivider
  60 {
  61   /** The dark color in the pattern. */
  62   Color dark;
  63
  64   /** The light color in the pattern. */
  65   Color light;
  66
  67   /** The JSplitPane the divider is on. */
  68   JSplitPane splitPane;
  69
  70   /** The split pane orientation. */
  71   int orientation;
  72
  73   /**
  74    * Creates a new instance of MetalSplitPaneDivider.
  75    *
  76    * @param ui the <code>MetalSplitPaneUI</code> that uses this divider
  77    */
  78   public MetalSplitPaneDivider(MetalSplitPaneUI ui, Color light, Color dark)
  79   {
  80     super(ui);
  81     setLayout(new MetalDividerLayout());
  82     this.splitPane = super.splitPane;
  83     this.orientation = super.orientation;
  84     this.light = light;
  85     this.dark = dark;
  86   }
  87
  88   /**
  89    * Paints the divider.
  90    *
  91    * @param g the <code>Graphics</code> context to use for painting
  92    */
  93   public void paint(Graphics g)
  94   {
  95     Dimension s = getSize();
  96     MetalUtils.fillMetalPattern(splitPane, g, 2, 2, s.width - 4, s.height - 4,
  97                                 light, dark);
  98     if (splitPane.isOneTouchExpandable())
  99       {
 100         ((BasicArrowButton) rightButton).paint(g);
 101         ((BasicArrowButton) leftButton).paint(g);
 102       }
 103   }
 104
 105   /**
 106    * This helper class acts as the Layout Manager for the divider.
 107    */
 108   public class MetalDividerLayout implements LayoutManager
 109   {
 110     /** The right button. */
 111     BasicArrowButton rb;
 112
 113     /** The left button. */
 114     BasicArrowButton lb;
 115
 116     /**
 117      * Creates a new DividerLayout object.
 118      */
 119     public MetalDividerLayout()
 120     {
 121       // Nothing to do here
 122     }
 123
 124     /**
 125      * This method is called when a Component is added.
 126      *
 127      * @param string The constraints string.
 128      * @param c The Component to add.
 129      */
 130     public void addLayoutComponent(String string, Component c)
 131     {
 132       // Nothing to do here, constraints are set depending on
 133       // orientation in layoutContainer
 134     }
 135
 136     /**
 137      * This method is called to lay out the container.
 138      *
 139      * @param c The container to lay out.
 140      */
 141     public void layoutContainer(Container c)
 142     {
 143       // The only components we care about setting up are the
 144       // one touch buttons.
 145       if (splitPane.isOneTouchExpandable())
 146         {
 147           if (c.getComponentCount() == 2)
 148             {
 149               Component c1 = c.getComponent(0);
 150               Component c2 = c.getComponent(1);
 151               if ((c1 instanceof BasicArrowButton)
 152                   && (c2 instanceof BasicArrowButton))
 153                 {
 154                   lb = ((BasicArrowButton) c1);
 155                   rb = ((BasicArrowButton) c2);
 156                 }
 157             }
 158           if (rb != null && lb != null)
 159             {
 160               Point p = getLocation();
 161               lb.setSize(lb.getPreferredSize());
 162               rb.setSize(rb.getPreferredSize());
 163               lb.setLocation(p.x, p.y);
 164
 165               if (orientation == JSplitPane.HORIZONTAL_SPLIT)
 166                 {
 167                   rb.setDirection(SwingConstants.EAST);
 168                   lb.setDirection(SwingConstants.WEST);
 169                   rb.setLocation(p.x, p.y + lb.getHeight());
 170                 }
 171               else
 172                 {
 173                   rb.setDirection(SwingConstants.SOUTH);
 174                   lb.setDirection(SwingConstants.NORTH);
 175                   rb.setLocation(p.x + lb.getWidth(), p.y);
 176                 }
 177             }
 178         }
 179     }
 180
 181     /**
 182      * This method returns the minimum layout size.
 183      *
 184      * @param c The container to calculate for.
 185      *
 186      * @return The minimum layout size.
 187      */
 188     public Dimension minimumLayoutSize(Container c)
 189     {
 190       return preferredLayoutSize(c);
 191     }
 192
 193     /**
 194      * This method returns the preferred layout size.
 195      *
 196      * @param c The container to calculate for.
 197      *
 198      * @return The preferred layout size.
 199      */
 200     public Dimension preferredLayoutSize(Container c)
 201     {
 202       int dividerSize = getDividerSize();
 203       return new Dimension(dividerSize, dividerSize);
 204     }
 205
 206     /**
 207      * This method is called when a component is removed.
 208      *
 209      * @param c The component to remove.
 210      */
 211     public void removeLayoutComponent(Component c)
 212     {
 213       // Nothing to do here. If buttons are removed
 214       // they will not be layed out when layoutContainer is
 215       // called.
 216     }
 217   }
 218 }