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 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code 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

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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 */

package javax.swing.plaf.basic;

import java.awt.Dimension;

import java.awt.Graphics;

import java.awt.Color;

import javax.swing.*;

import javax.swing.plaf.UIResource;

/**

 * JButton object that draws a scaled Arrow in one of the cardinal directions.

 * <p>

 * <strong>Warning:</strong>

 * Serialized objects of this class will not be compatible with

 * future Swing releases. The current serialization support is

 * appropriate for short term storage or RMI between applications running

 * the same version of Swing.  As of 1.4, support for long term storage

 * of all JavaBeans™

 * has been added to the <code>java.beans</code> package.

 * Please see {@link java.beans.XMLEncoder}.

 *

 * @author David Kloba

 */

@SuppressWarnings("serial") // Same-version serialization only

public class BasicArrowButton extends JButton implements SwingConstants

{

        /**

         * The direction of the arrow. One of

         * {@code SwingConstants.NORTH}, {@code SwingConstants.SOUTH},

         * {@code SwingConstants.EAST} or {@code SwingConstants.WEST}.

         */

        protected int direction;

        private Color shadow;

        private Color darkShadow;

        private Color highlight;

        /**

         * Creates a {@code BasicArrowButton} whose arrow

         * is drawn in the specified direction and with the specified

         * colors.

         *

         * @param direction the direction of the arrow; one of

         *        {@code SwingConstants.NORTH}, {@code SwingConstants.SOUTH},

         *        {@code SwingConstants.EAST} or {@code SwingConstants.WEST}

         * @param background the background color of the button

         * @param shadow the color of the shadow

         * @param darkShadow the color of the dark shadow

         * @param highlight the color of the highlight

         * @since 1.4

         */

        public BasicArrowButton(int direction, Color background, Color shadow,

                         Color darkShadow, Color highlight) {

            super();

            setRequestFocusEnabled(false);

            setDirection(direction);

            setBackground(background);

            this.shadow = shadow;

            this.darkShadow = darkShadow;

            this.highlight = highlight;

        }

        /**

         * Creates a {@code BasicArrowButton} whose arrow

         * is drawn in the specified direction.

         *

         * @param direction the direction of the arrow; one of

         *        {@code SwingConstants.NORTH}, {@code SwingConstants.SOUTH},

         *        {@code SwingConstants.EAST} or {@code SwingConstants.WEST}

         */

        public BasicArrowButton(int direction) {

            this(direction, UIManager.getColor("control"), UIManager.getColor("controlShadow"),

                 UIManager.getColor("controlDkShadow"), UIManager.getColor("controlLtHighlight"));

        }

        /**

         * Returns the direction of the arrow.

         *

         * @return the direction of the arrow

         */

        public int getDirection() {

            return direction;

        }

        /**

         * Sets the direction of the arrow.

         *

         * @param direction the direction of the arrow; one of

         *        of {@code SwingConstants.NORTH},

         *        {@code SwingConstants.SOUTH},

         *        {@code SwingConstants.EAST} or {@code SwingConstants.WEST}

         */

        public void setDirection(int direction) {

            this.direction = direction;

        }

        public void paint(Graphics g) {

            Color origColor;

            boolean isPressed, isEnabled;

            int w, h, size;

            w = getSize().width;

            h = getSize().height;

            origColor = g.getColor();

            isPressed = getModel().isPressed();

            isEnabled = isEnabled();

            g.setColor(getBackground());

            g.fillRect(1, 1, w-2, h-2);

            /// Draw the proper Border

            if (getBorder() != null && !(getBorder() instanceof UIResource)) {

                paintBorder(g);

            } else if (isPressed) {

                g.setColor(shadow);

                g.drawRect(0, 0, w-1, h-1);

            } else {

                // Using the background color set above

                g.drawLine(0, 0, 0, h-1);

                g.drawLine(1, 0, w-2, 0);

                g.setColor(highlight);    // inner 3D border

                g.drawLine(1, 1, 1, h-3);

                g.drawLine(2, 1, w-3, 1);

                g.setColor(shadow);       // inner 3D border

                g.drawLine(1, h-2, w-2, h-2);

                g.drawLine(w-2, 1, w-2, h-3);

                g.setColor(darkShadow);     // black drop shadow  __|

                g.drawLine(0, h-1, w-1, h-1);

                g.drawLine(w-1, h-1, w-1, 0);

            }

            // If there's no room to draw arrow, bail

            if(h < 5 || w < 5)      {

                g.setColor(origColor);

                return;

            }

            if (isPressed) {

                g.translate(1, 1);

            }

            // Draw the arrow

            size = Math.min((h - 4) / 3, (w - 4) / 3);

            size = Math.max(size, 2);

            paintTriangle(g, (w - size) / 2, (h - size) / 2,

                                size, direction, isEnabled);

            // Reset the Graphics back to it's original settings

            if (isPressed) {

                g.translate(-1, -1);

            }

            g.setColor(origColor);

        }

        /**

         * Returns the preferred size of the {@code BasicArrowButton}.

         *

         * @return the preferred size

         */

        public Dimension getPreferredSize() {

            return new Dimension(16, 16);

        }

        /**

         * Returns the minimum size of the {@code BasicArrowButton}.

         *

         * @return the minimum size

         */

        public Dimension getMinimumSize() {

            return new Dimension(5, 5);

        }

        /**

         * Returns the maximum size of the {@code BasicArrowButton}.

         *

         * @return the maximum size

         */

        public Dimension getMaximumSize() {

            return new Dimension(Integer.MAX_VALUE, Integer.MAX_VALUE);

        }

        /**

         * Returns whether the arrow button should get the focus.

         * {@code BasicArrowButton}s are used as a child component of

         * composite components such as {@code JScrollBar} and

         * {@code JComboBox}. Since the composite component typically gets the

         * focus, this method is overriden to return {@code false}.

         *

         * @return {@code false}

         */

        public boolean isFocusTraversable() {

          return false;

        }

        /**

         * Paints a triangle.

         *

         * @param g the {@code Graphics} to draw to

         * @param x the x coordinate

         * @param y the y coordinate

         * @param size the size of the triangle to draw

         * @param direction the direction in which to draw the arrow;

         *        one of {@code SwingConstants.NORTH},

         *        {@code SwingConstants.SOUTH}, {@code SwingConstants.EAST} or

         *        {@code SwingConstants.WEST}

         * @param isEnabled whether or not the arrow is drawn enabled

         */

        public void paintTriangle(Graphics g, int x, int y, int size,

                                        int direction, boolean isEnabled) {

            Color oldColor = g.getColor();

            int mid, i, j;

            j = 0;

            size = Math.max(size, 2);

            mid = (size / 2) - 1;

            g.translate(x, y);

            if(isEnabled)

                g.setColor(darkShadow);

            else

                g.setColor(shadow);

            switch(direction)       {

            case NORTH:

                for(i = 0; i < size; i++)      {

                    g.drawLine(mid-i, i, mid+i, i);

                }

                if(!isEnabled)  {

                    g.setColor(highlight);

                    g.drawLine(mid-i+2, i, mid+i, i);

                }

                break;

            case SOUTH:

                if(!isEnabled)  {

                    g.translate(1, 1);

                    g.setColor(highlight);

                    for(i = size-1; i >= 0; i--)   {

                        g.drawLine(mid-i, j, mid+i, j);

                        j++;

                    }

                    g.translate(-1, -1);

                    g.setColor(shadow);

                }

                j = 0;

                for(i = size-1; i >= 0; i--)   {

                    g.drawLine(mid-i, j, mid+i, j);

                    j++;

                }

                break;

            case WEST:

                for(i = 0; i < size; i++)      {

                    g.drawLine(i, mid-i, i, mid+i);

                }

                if(!isEnabled)  {

                    g.setColor(highlight);

                    g.drawLine(i, mid-i+2, i, mid+i);

                }

                break;

            case EAST:

                if(!isEnabled)  {

                    g.translate(1, 1);

                    g.setColor(highlight);

                    for(i = size-1; i >= 0; i--)   {

                        g.drawLine(j, mid-i, j, mid+i);

                        j++;

                    }

                    g.translate(-1, -1);

                    g.setColor(shadow);

                }

                j = 0;

                for(i = size-1; i >= 0; i--)   {

                    g.drawLine(j, mid-i, j, mid+i);

                    j++;

                }

                break;

            }

            g.translate(-x, -y);

            g.setColor(oldColor);

        }

}