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+/* EtchedBorder.java --
+ Copyright (C) 2003 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;
+
+
+/**
+ * A border that looks like an engraving etched into the background
+ * surface, or (in its raised variant) coming out of the surface
+ * plane. Using different constructors, it is possible to either
+ * explicitly specify the border colors, or to let the colors derive
+ * from the background color of the enclosed Component.
+ *
+ * <p><img src="doc-files/EtchedBorder-1.png" width="500" height="200"
+ * alt="[An illustration of the two EtchedBorder variants]" />
+ *
+ * @author Sascha Brawer (brawer@dandelis.ch)
+ */
+public class EtchedBorder extends AbstractBorder
+{
+ /**
+ * Determined using the <code>serialver</code> tool
+ * of Apple/Sun JDK 1.3.1 on MacOS X 10.1.5.
+ */
+ static final long serialVersionUID = 4001244046866360638L;
+
+
+ /**
+ * Indicates that the border appears as coming out of the
+ * background.
+ */
+ public static final int RAISED = 0;
+
+
+ /**
+ * Indicates that the border appears as engraved into the
+ * background.
+ */
+ public static final int LOWERED = 1;
+
+
+ /**
+ * The type of this EtchedBorder, which is either {@link #RAISED}
+ * or {@link #LOWERED}.
+ */
+ protected int etchType;
+
+
+ /**
+ * The highlight color, or <code>null</code> to indicate that the
+ * color shall be derived from the background of the enclosed
+ * component.
+ */
+ protected Color highlight;
+
+
+ /**
+ * The shadow color, or <code>null</code> to indicate that the
+ * color shall be derived from the background of the enclosed
+ * component.
+ */
+ protected Color shadow;
+
+
+ /**
+ * Constructs a lowered EtchedBorder. The colors will be derived
+ * from the background color of the enclosed Component when the
+ * border gets painted.
+ */
+ public EtchedBorder()
+ {
+ this(LOWERED);
+ }
+
+
+ /**
+ * Constructs an EtchedBorder with the specified appearance. The
+ * colors will be derived from the background color of the enclosed
+ * Component when the border gets painted.
+ *
+ * <p><img src="doc-files/EtchedBorder-1.png" width="500" height="200"
+ * alt="[An illustration of the two EtchedBorder variants]" />
+ *
+ * @param etchType the desired appearance of the border. The value
+ * must be either {@link #RAISED} or {@link #LOWERED}.
+ *
+ * @throws IllegalArgumentException if <code>etchType</code> has
+ * an unsupported value.
+ */
+ public EtchedBorder(int etchType)
+ {
+ if ((etchType != RAISED) && (etchType != LOWERED))
+ throw new IllegalArgumentException();
+
+ this.etchType = etchType;
+
+ /* The highlight and shadow fields already have a null value
+ * when the constructor gets called, so there is no need to
+ * assign a value here.
+ */
+ }
+
+
+ /**
+ * Constructs a lowered EtchedBorder, explicitly selecting the
+ * colors that will be used for highlight and shadow.
+ *
+ * @param highlight the color that will be used for painting
+ * the highlight part of the border.
+ *
+ * @param shadow the color that will be used for painting
+ * the shadow part of the border.
+ *
+ * @see #EtchedBorder(int, Color, Color)
+ */
+ public EtchedBorder(Color highlight, Color shadow)
+ {
+ this(LOWERED, highlight, shadow);
+ }
+
+
+ /**
+ * Constructs an EtchedBorder with the specified appearance,
+ * explicitly selecting the colors that will be used for
+ * highlight and shadow.
+ *
+ * <p><img src="doc-files/EtchedBorder-2.png" width="500" height="200"
+ * alt="[An illustration that shows which pixels get painted
+ * in what color]" />
+ *
+ * @param etchType the desired appearance of the border. The value
+ * must be either {@link #RAISED} or {@link #LOWERED}.
+ *
+ * @param highlight the color that will be used for painting
+ * the highlight part of the border.
+ *
+ * @param shadow the color that will be used for painting
+ * the shadow part of the border.
+ *
+ * @throws IllegalArgumentException if <code>etchType</code> has
+ * an unsupported value.
+ */
+ public EtchedBorder(int etchType, Color highlight, Color shadow)
+ {
+ this(etchType); // Checks the validity of the value.
+ this.highlight = highlight;
+ this.shadow = shadow;
+ }
+
+
+ /**
+ * 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)
+ {
+ switch (etchType)
+ {
+ case RAISED:
+ paintEtchedBorder(g, x, y, width, height,
+ getHighlightColor(c), getShadowColor(c));
+ break;
+
+ case LOWERED:
+ paintEtchedBorder(g, x, y, width, height,
+ getShadowColor(c), getHighlightColor(c));
+ break;
+ }
+ }
+
+
+ /**
+ * 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)
+ {
+ return new Insets(2, 2, 2, 2);
+ }
+
+
+ /**
+ * 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(Component)
+ */
+ public Insets getBorderInsets(Component c, Insets insets)
+ {
+ insets.left = insets.right = insets.top = insets.bottom = 2;
+ return insets;
+ }
+
+
+ /**
+ * Determines whether this border fills every pixel in its area
+ * when painting.
+ *
+ * <p>If the border colors are derived from the background color of
+ * the enclosed component, the result is <code>true</code> because
+ * the derivation method always returns opaque colors. Otherwise,
+ * the result depends on the opacity of the individual colors.
+ *
+ * @return <code>true</code> if the border is fully opaque, or
+ * <code>false</code> if some pixels of the background
+ * can shine through the border.
+ */
+ public boolean isBorderOpaque()
+ {
+ // If the colors are to be derived from the enclosed Component's
+ // background color, the border is guaranteed to be fully opaque
+ // because Color.brighten() and Color.darken() always return an
+ // opaque color.
+ return
+ ((highlight == null) || (highlight.getAlpha() == 255))
+ && ((shadow == null) || (shadow.getAlpha() == 255));
+ }
+
+ /**
+ * Returns the appearance of this EtchedBorder, which is either
+ * {@link #RAISED} or {@link #LOWERED}.
+ *
+ * @return The type ({@link #RAISED} or {@link #LOWERED}).
+ */
+ public int getEtchType()
+ {
+ return etchType;
+ }
+
+
+ /**
+ * Determines the color that will be used for highlighted parts when
+ * painting the border around a given component. If a highlight
+ * color has been specified upon constructing the border, that color
+ * is returned. Otherwise, the background color of the enclosed
+ * component is brightened.
+ *
+ * @param c the component enclosed by this border.
+ *
+ * @return The color.
+ *
+ * @see java.awt.Component#getBackground()
+ * @see java.awt.Color#brighter()
+ */
+ public Color getHighlightColor(Component c)
+ {
+ if (highlight != null)
+ return highlight;
+ else
+ return c.getBackground().brighter();
+ }
+
+ /**
+ * Returns the color that will be used for highlighted parts when
+ * painting the border, or <code>null</code> if that color will be
+ * derived from the background of the enclosed Component.
+ *
+ * @return The highlight color (possibly <code>null</code>).
+ */
+ public Color getHighlightColor()
+ {
+ return highlight;
+ }
+
+
+ /**
+ * Determines the color that will be used for shadowed parts when
+ * painting the border around a given component. If a shadow color
+ * has been specified upon constructing the border, that color is
+ * returned. Otherwise, the background color of the enclosed
+ * component is darkened.
+ *
+ * @param c the component enclosed by this border.
+ *
+ * @return The shadow color.
+ *
+ * @see java.awt.Component#getBackground()
+ * @see java.awt.Color#darker()
+ */
+ public Color getShadowColor(Component c)
+ {
+ if (shadow != null)
+ return shadow;
+ else
+ return c.getBackground().darker();
+ }
+
+
+ /**
+ * Returns the color that will be used for shadowed parts when
+ * painting the border, or <code>null</code> if that color will be
+ * derived from the background of the enclosed Component.
+ *
+ * @return The shadow color (possibly <code>null</code>).
+ */
+ public Color getShadowColor()
+ {
+ return shadow;
+ }
+
+
+ /**
+ * Paints a two-pixel etching in two colors.
+ *
+ * <pre>
+ * +++++++++++.
+ * +.........+. + = color a
+ * +. +. . = color b
+ * +. +.
+ * +++++++++++.
+ * ............</pre>
+ *
+ * @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.
+ * @param a one of the two colors.
+ * @param b the second of the two colors.
+ */
+ private static void paintEtchedBorder(Graphics g, int x, int y, int width,
+ int height, Color a, Color b)
+ {
+ Color oldColor;
+
+ oldColor = g.getColor();
+ g.translate(x, y);
+ width = width - 1;
+ height = height - 1;
+
+ try
+ {
+ // To understand this code, it might be helpful to look at the
+ // images that are included with the JavaDoc. They are located
+ // in the "doc-files" subdirectory. EtchedBorder-2.png might
+ // be especially informative.
+ g.setColor(a);
+ g.drawRect(0, 0, width - 1, height - 1);
+
+ g.setColor(b);
+ g.drawLine(1, 1, width - 2, 1); // top edge
+ g.drawLine(1, 2, 1, height - 2); // left edge
+ g.drawLine(0, height, width, height); // bottom edge
+ g.drawLine(width, 0, width, height - 1); // right edge
+ }
+ finally
+ {
+ g.translate(-x, -y);
+ g.setColor(oldColor);
+ }
+ }
+}