gcc/libjava/classpath/javax/swing/plaf/basic/BasicArrowButton.java

/* BasicArrowButton.java --
   Copyright (C) 2004, 2005 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
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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
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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
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this exception to your version of the library, but you are not
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package javax.swing.plaf.basic;

import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Insets;
import java.awt.Polygon;
import java.awt.Rectangle;

import javax.swing.JButton;
import javax.swing.SwingConstants;
import javax.swing.border.Border;

/**
 * This class draws simple arrow buttons for the Basic Look and Feel.
 */
public class BasicArrowButton extends JButton implements SwingConstants
{
  /** The default size of the Arrow buttons. */
  private static int defaultSize = 12;

  /** The Polygon that points up. */
  private static Polygon upIcon = new Polygon(new int[] { 0, 5, 9 },
                                              new int[] { 7, 2, 7 }, 3);

  /** The Polygon that points down. */
  private static Polygon downIcon = new Polygon(new int[] { 1, 5, 9 },
                                                new int[] { 3, 7, 3 }, 3);

  /** The Polygon that points left. */
  private static Polygon leftIcon = new Polygon(new int[] { 7, 3, 7 },
                                                new int[] { 1, 5, 9 }, 3);

  /** The Polygon that points right. */
  private static Polygon rightIcon = new Polygon(new int[] { 3, 7, 3 },
                                                 new int[] { 1, 5, 9 }, 3);

  /** The direction to point in. */
  protected int direction;

  /**
   * The color the arrow is painted in if disabled and the bottom and right
   * edges of the button.
   * This is package-private to avoid an accessor method.
   */
  transient Color shadow = Color.GRAY;

  /**
   * The color the arrow is painted in if enabled and the bottom and right
   * edges of the button.
   * This is package-private to avoid an accessor method.
   */
  transient Color darkShadow = Color.DARK_GRAY;

  /**
   * The top and left edges of the button.
   * This is package-private to avoid an accessor method.
   */
  transient Color highlight = Color.WHITE;

  /** The border around the ArrowButton. */
  private transient Border buttonBorder = new Border()
    {
      public Insets getBorderInsets(Component c)
      {
	return new Insets(2, 2, 2, 2);
      }

      public boolean isBorderOpaque()
      {
	return true;
      }

      public void paintBorder(Component c, Graphics g, int x, int y, int w,
                              int h)
      {
	Color saved = g.getColor();
	g.setColor(highlight);

	g.drawLine(x + 1, y + 1, x + w - 1, y + 1);
	g.drawLine(x + 1, y + 1, x + 1, y + h - 1);

	g.setColor(shadow);

	g.drawLine(x + 1, y + h - 1, x + w - 1, y + h - 1);
	g.drawLine(x + w - 1, y + 1, x + w - 1, y + h - 1);

	g.setColor(darkShadow);

	g.drawLine(x, y + h, x + w, y + h);
	g.drawLine(x + w, y, x + w, y + h);

	g.setColor(saved);
      }
    };

  /**
   * Creates a new BasicArrowButton object.
   *
   * @param direction The direction the arrow points in.
   */
  public BasicArrowButton(int direction)
  {
    super();
    setBorder(buttonBorder);
    setDirection(direction);
  }

  /**
   * Creates a new BasicArrowButton object with the given colors and
   * direction.
   *
   * @param direction The direction to point in.
   * @param background The background color.
   * @param shadow The shadow color.
   * @param darkShadow The dark shadow color.
   * @param highlight The highlight color.
   */
  public BasicArrowButton(int direction, Color background, Color shadow,
                          Color darkShadow, Color highlight)
  {
    this(direction);
    setBackground(background);
    this.shadow = shadow;
    this.darkShadow = darkShadow;
    this.highlight = highlight;
  }

  /**
   * This method returns whether the focus can traverse to this component.
   *
   * @return Whether the focus can traverse to this component.
   */
  public boolean isFocusTraversable()
  {
    return false;
  }

  /**
   * This method returns the direction of the arrow.
   *
   * @return The direction of the arrow.
   */
  public int getDirection()
  {
    return direction;
  }

  /**
   * This method changes the direction of the arrow.
   *
   * @param dir The new direction of the arrow.
   */
  public void setDirection(int dir)
  {
    this.direction = dir;
  }

  /**
   * This method paints the arrow button. The painting is delegated to the
   * paintTriangle method.
   *
   * @param g The Graphics object to paint with.
   */
  public void paint(Graphics g)
  {
    super.paint(g);
    Insets insets = getInsets();
    Rectangle bounds = getBounds();
    int x = insets.left
            + (bounds.width - insets.left - insets.right - defaultSize) / 2;
    int y = insets.top
            + (bounds.height - insets.left - insets.right - defaultSize) / 2;
    paintTriangle(g, x, y, defaultSize, direction, isEnabled());
  }

  /**
   * This method returns the preferred size of the arrow button.
   *
   * @return The preferred size.
   */
  public Dimension getPreferredSize()
  {
    Insets insets = getInsets();
    int w = defaultSize + insets.left + insets.right;
    int h = defaultSize + insets.top + insets.bottom;

    return new Dimension(w, h);
  }

  /**
   * This method returns the minimum size of the arrow button.
   *
   * @return The minimum size.
   */
  public Dimension getMinimumSize()
  {
    return getPreferredSize();
  }

  /**
   * This method returns the maximum size of the arrow button.
   *
   * @return The maximum size.
   */
  public Dimension getMaximumSize()
  {
    return getPreferredSize();
  }

  /**
   * The method paints a triangle with the given size and direction at the
   * given x and y coordinates.
   *
   * @param g The Graphics object to paint with.
   * @param x The x coordinate to paint at.
   * @param y The y coordinate to paint at.
   * @param size The size of the icon.
   * @param direction The direction of the icon.
   * @param isEnabled Whether it is enabled.
   */
  public void paintTriangle(Graphics g, int x, int y, int size, int direction,
                            boolean isEnabled)
  {
    Polygon arrow = null;
    switch (direction)
      {
      case NORTH:
	arrow = upIcon;
	break;
      case SOUTH:
	arrow = downIcon;
	break;
      case EAST:
      case RIGHT:
	arrow = rightIcon;
	break;
      case WEST:
      case LEFT:
	arrow = leftIcon;
	break;
      }

    int[] xPoints = arrow.xpoints;
    int[] yPoints = arrow.ypoints;
    int x1;
    int y1;
    int x2;
    int y2;
    x1 = y1 = x2 = y2 = 0;

    if (size != defaultSize)
      {
	float scale = size * 1f / defaultSize;
	for (int i = 0; i < 3; i++)
	  {
	    xPoints[i] *= scale;
	    yPoints[i] *= scale;
	  }
      }
    g.translate(x, y);

    switch (direction)
      {
      case NORTH:
	x1 = xPoints[0] + 2;
	y1 = yPoints[0];
	y2 = y1;
	x2 = xPoints[2] - 1;
	break;
      case SOUTH:
	x1 = xPoints[1];
	y1 = yPoints[1] + 1;
	x2 = xPoints[2] - 1;
	y2 = yPoints[2];
	break;
      case LEFT:
      case WEST:
	x1 = xPoints[0] + 1;
	y1 = yPoints[0] + 1;
	x2 = x1;
	y2 = yPoints[2] + 1;
	break;
      case RIGHT:
      case EAST:
	x1 = xPoints[2];
	y1 = yPoints[2] + 1;
	x2 = xPoints[1] - 1;
	y2 = yPoints[1] + 1;
	break;
      }
    Color saved = g.getColor();

    if (isEnabled)
      {
	g.setColor(Color.DARK_GRAY);

	if (arrow != null)
	  g.fillPolygon(xPoints, yPoints, 3);
      }
    else
      {
	g.setColor(Color.GRAY);
	g.fillPolygon(xPoints, yPoints, 3);
	g.setColor(Color.WHITE);
	g.drawLine(x1, y1, x2, y2);
      }
    g.setColor(saved);
    g.translate(-x, -y);
  }
}