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+/* MatteBorder.java --
+   Copyright (C) 2003, 2004, 2006  Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package javax.swing.border;
+
+import java.awt.Color;
+import java.awt.Component;
+import java.awt.Graphics;
+import java.awt.Insets;
+
+import javax.swing.Icon;
+
+/**
+ * A border that is filled with either a solid color or with repeated
+ * icon tiles.
+ *
+ * <p><img src="doc-files/MatteBorder-1.png" width="500" height="150"
+ * alt="[Two MatteBorders]" />
+ *
+ * @author Sascha Brawer (brawer@dandelis.ch)
+ */
+public class MatteBorder extends EmptyBorder
+{
+  /**
+   * Determined using the <code>serialver</code> tool
+   * of Apple/Sun JDK 1.3.1 on MacOS X 10.1.5.
+   */
+  static final long serialVersionUID = 4422248989617298224L;
+
+
+  /**
+   * The color that is used for filling the border, or
+   * <code>null</code> if the border is filled with repetitions of a
+   * tile icon.
+   *
+   * @see #tileIcon
+   */
+  protected Color color;
+
+
+  /**
+   * The icon is used for filling the border with a tile, or
+   * <code>null</code> if the border is filled with a solid
+   * color.
+   *
+   * @see #color
+   */
+  protected Icon tileIcon;
+
+
+  /**
+   * Constructs a MatteBorder given the width on each side
+   * and a fill color.
+   *
+   * <p><img src="doc-files/MatteBorder-2.png" width="500" height="150"
+   * alt="[A picture of a MatteBorder made by this constructor]" />
+   *
+   * @param top the width of the border at its top edge.
+   * @param left the width of the border at its left edge.
+   * @param bottom the width of the border at its bottom edge.
+   * @param right the width of the border at its right edge.
+   * @param matteColor the color for filling the border.
+   */
+  public MatteBorder(int top, int left, int bottom, int right,
+                     Color matteColor)
+  {
+    super(top, left, bottom, right);
+
+    if (matteColor == null)
+      throw new IllegalArgumentException();
+
+    this.color = matteColor;
+  }
+
+
+  /**
+   * Constructs a MatteBorder given its insets and fill color.
+   *
+   * <p><img src="doc-files/MatteBorder-3.png" width="500" height="150"
+   * alt="[A picture of a MatteBorder made by this constructor]" />
+   *
+   * @param borderInsets an Insets object whose <code>top</code>,
+   *        <code>left</code>, <code>bottom</code> and <code>right</code>
+   *        fields indicate the with of the border at the respective
+   *        edge.
+   *
+   * @param matteColor the color for filling the border.
+   */
+  public MatteBorder(Insets borderInsets, Color matteColor)
+  {
+    this(borderInsets.top, borderInsets.left,
+         borderInsets.bottom, borderInsets.right,
+         matteColor);
+  }
+
+
+  /**
+   * Constructs a MatteBorder given the width on each side
+   * and an icon for tiling the border area.
+   *
+   * <p><img src="doc-files/MatteBorder-4.png" width="500" height="150"
+   * alt="[A picture of a MatteBorder made by this constructor]" />
+   *
+   * @param top the width of the border at its top edge.
+   * @param left the width of the border at its left edge.
+   * @param bottom the width of the border at its bottom edge.
+   * @param right the width of the border at its right edge.
+   * @param tileIcon an icon for tiling the border area.
+   */
+  public MatteBorder(int top, int left, int bottom, int right,
+                     Icon tileIcon)
+  {
+    super(top, left, bottom, right);
+
+    this.tileIcon = tileIcon;
+  }
+
+
+  /**
+   * Constructs a MatteBorder given its insets and an icon
+   * for tiling the border area.
+   *
+   * <p><img src="doc-files/MatteBorder-5.png" width="500" height="150"
+   * alt="[A picture of a MatteBorder made by this constructor]" />
+   *
+   * @param borderInsets an Insets object whose <code>top</code>,
+   *        <code>left</code>, <code>bottom</code> and <code>right</code>
+   *        fields indicate the with of the border at the respective
+   *        edge.
+   *
+   * @param tileIcon an icon for tiling the border area.
+   */
+  public MatteBorder(Insets borderInsets, Icon tileIcon)
+  {
+    this(borderInsets.top, borderInsets.left,
+         borderInsets.bottom, borderInsets.right,
+         tileIcon);
+  }
+
+
+  /**
+   * Constructs a MatteBorder given an icon for tiling the
+   * border area. The icon width is used for the border insets
+   * at the left and right edge, the icon height for the top and
+   * bottom edge.
+   *
+   * <p><img src="doc-files/MatteBorder-6.png" width="379" height="150"
+   * alt="[A picture of a MatteBorder made by this constructor]" />
+   *
+   * @param tileIcon an icon for tiling the border area.
+   */
+  public MatteBorder(Icon tileIcon)
+  {
+    this(-1, -1, -1, -1, tileIcon);
+  }
+
+
+  /**
+   * Paints the border for a given component.
+   *
+   * @param c the component whose border is to be painted.
+   * @param g the graphics for painting.
+   * @param x the horizontal position for painting the border.
+   * @param y the vertical position for painting the border.
+   * @param width the width of the available area for painting the border.
+   * @param height the height of the available area for painting the border.
+   */
+  public void paintBorder(Component c, Graphics  g,
+                          int x, int y, int width, int height)
+  {
+    Insets i = getBorderInsets();
+    paintEdge(c, g, x, y, width, i.top, 0, 0);      // top edge
+    paintEdge(c, g, x, y + height - i.bottom,       // bottom edge
+              width, i.bottom,
+              0, height - i.bottom);
+    paintEdge(c, g, x, y + i.top,                   // left edge
+              i.left, height - i.top,
+              0, i.top);
+    paintEdge(c, g, x + width - i.right, y + i.top, // right edge
+              i.right, height - i.bottom,
+              width - i.right, i.top);
+  }
+
+
+  /**
+   * Measures the width of this border.
+   *
+   * @param c the component whose border is to be measured.
+   *
+   * @return an Insets object whose <code>left</code>, <code>right</code>,
+   *         <code>top</code> and <code>bottom</code> fields indicate the
+   *         width of the border at the respective edge.
+   *
+   * @see #getBorderInsets(java.awt.Component, java.awt.Insets)
+   */
+  public Insets getBorderInsets(Component c)
+  {
+    /* There is no obvious reason for overriding this method, but we
+     * try to have exactly the same API as the Sun reference
+     * implementation.
+     */
+    return this.getBorderInsets(c, null);
+  }
+
+
+  /**
+   * Measures the width of this border, storing the results into a
+   * pre-existing Insets object.
+   *
+   * @param insets an Insets object for holding the result values.
+   *        After invoking this method, the <code>left</code>,
+   *        <code>right</code>, <code>top</code> and
+   *        <code>bottom</code> fields indicate the width of the
+   *        border at the respective edge.
+   *
+   * @return the same object that was passed for <code>insets</code>.
+   *
+   * @see #getBorderInsets()
+   */
+  public Insets getBorderInsets(Component c, Insets insets)
+  {
+    if (insets == null)
+      insets = new Insets(0, 0, 0, 0);
+
+    if ((tileIcon != null)
+        && (top < 0) && (left < 0)
+        && (right < 0) && (bottom < 0))
+    {
+      insets.left = insets.right = tileIcon.getIconWidth();
+      insets.top = insets.bottom = tileIcon.getIconHeight();
+      return insets;
+    }
+
+    /* Copy top, left, bottom and right into the respective
+     * field of insets.
+     */
+    return super.getBorderInsets(c, insets);
+  }
+
+
+  /**
+   * Measures the width of this border.
+   *
+   * @return an Insets object whose <code>left</code>, <code>right</code>,
+   *         <code>top</code> and <code>bottom</code> fields indicate the
+   *         width of the border at the respective edge.
+   *
+   * @see #getBorderInsets(java.awt.Component, java.awt.Insets)
+   */
+  public Insets getBorderInsets()
+  {
+    /* The inherited implementation of EmptyBorder.isBorderOpaque()
+     * would do the same. It is not clear why this is overriden in the
+     * Sun implementation, at least not from just reading the JavaDoc.
+     */
+    return this.getBorderInsets(null, null);
+  }
+
+
+  /**
+   * Returns the color that is used for filling the border, or
+   * <code>null</code> if the border is filled with repetitions of a
+   * tile icon.
+   *
+   * @return The color (possibly <code>null</code>).
+   */
+  public Color getMatteColor()
+  {
+    return color;
+  }
+
+
+  /**
+   * Returns the icon is used for tiling the border, or
+   * <code>null</code> if the border is filled with a color instead of
+   * an icon.
+   *
+   * @return The icon (possibly <code>null</code>).
+   */
+  public Icon getTileIcon()
+  {
+    return tileIcon;
+  }
+
+
+  /**
+   * Determines whether this border fills every pixel in its area
+   * when painting.
+   *
+   * @return <code>true</code> if the border is filled with an
+   *         opaque color; <code>false</code> if it is filled with
+   *         a semi-transparent color or with an icon.
+   */
+  public boolean isBorderOpaque()
+  {
+    return (color != null) && (color.getAlpha() == 255);
+  }
+
+
+  /**
+   * Paints a rectangular area of the border. This private helper
+   * method is called once for each of the border edges
+   * by {@link #paintBorder}.
+   *
+   * @param c the component whose border is being painted.
+   * @param g the graphics for painting.
+   * @param x the horizontal position of the rectangular area.
+   * @param y the vertical position of the rectangular area.
+   * @param width the width of the rectangular area.
+   * @param height the height of the rectangular area.
+   * @param dx the x displacement for repeating the tile.
+   * @param dy the y displacement for repeating the tile.
+   */
+  private void paintEdge(Component c, Graphics g,
+                         int x, int y, int width, int height,
+                         int dx, int dy)
+  {
+    Color oldColor;
+    int iconWidth, iconHeight;
+    Graphics clipped;
+
+    if ((width <= 0) || (height <= 0))
+      return;
+
+    /* Paint a colored rectangle if desired. */
+    if (color != null)
+    {
+      oldColor = g.getColor();
+      try
+      {
+        g.setColor(color);
+        g.fillRect(x, y, width, height);
+      }
+      finally
+      {
+        g.setColor(oldColor);
+      }
+      return;
+    }
+
+    // If this border has no icon end painting here.
+    if (tileIcon == null)
+      return;
+
+    /* Determine the width and height of the icon. Some icons return
+     * -1 if it is an image whose dimensions have not yet been
+     * retrieved. There is not much we can do about this, but we
+     * should at least avoid entering the paint loop below
+     * with negative increments.
+     */
+    iconWidth = tileIcon.getIconWidth();
+    iconHeight = tileIcon.getIconHeight();
+    if ((iconWidth <= 0) || (iconHeight <= 0))
+      return;
+
+    dx = dx % iconWidth;
+    dy = dy % iconHeight;
+
+    clipped = g.create();
+    try
+    {
+      clipped.setClip(x, y, width, height);
+      for (int ty = y - dy; ty < y + height; ty += iconHeight)
+        for (int tx = x - dx; tx < x + width; tx += iconWidth)
+          tileIcon.paintIcon(c, clipped, tx, ty);
+    }
+    finally
+    {
+      clipped.dispose();
+    }
+  }
+}