/*

 * Copyright (c) 2005, 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

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package sun.swing.icon;

import java.awt.Color;

import java.awt.Component;

import java.awt.Graphics;

import java.io.Serializable;

import javax.swing.Icon;

import javax.swing.UIManager;

import javax.swing.plaf.UIResource;

/**

 * Sorting icon.

 *

 */

public class SortArrowIcon implements Icon, UIResource, Serializable {

    // Height of the arrow, the width is ARROW_HEIGHT

    private static final int ARROW_HEIGHT = 5;

    // Amount of pad to left of arrow

    private static final int X_PADDING = 7;

    // Sort direction

    private boolean ascending;

    // The Color to use, may be null indicating colorKey should be used

    private Color color;

    // If non-null indicates the color should come from the UIManager with

    // this key.

    private String colorKey;

    /**

     * Creates a <code>SortArrowIcon</code>.

     *

     * @param ascending if true, icon respresenting ascending sort, otherwise

     *        descending

     * @param color the color to render the icon

     */

    public SortArrowIcon(boolean ascending, Color color) {

        this.ascending = ascending;

        this.color = color;

        if (color == null) {

            throw new IllegalArgumentException();

        }

    }

    /**

     * Creates a <code>SortArrowIcon</code>.

     *

     * @param ascending if true, icon respresenting ascending sort, otherwise

     *        descending

     * @param colorKey the key used to find color in UIManager

     */

    public SortArrowIcon(boolean ascending, String colorKey) {

        this.ascending = ascending;

        this.colorKey = colorKey;

        if (colorKey == null) {

            throw new IllegalArgumentException();

        }

    }

    public void paintIcon(Component c, Graphics g, int x, int y) {

        g.setColor(getColor());

        int startX = X_PADDING + x + ARROW_HEIGHT / 2;

        if (ascending) {

            int startY = y;

            g.fillRect(startX, startY, 1, 1);

            for (int line = 1; line < ARROW_HEIGHT; line++) {

                g.fillRect(startX - line, startY + line,

                           line + line + 1, 1);

            }

        }

        else {

            int startY = y + ARROW_HEIGHT - 1;

            g.fillRect(startX, startY, 1, 1);

            for (int line = 1; line < ARROW_HEIGHT; line++) {

                g.fillRect(startX - line, startY - line,

                           line + line + 1, 1);

            }

        }

    }

    public int getIconWidth() {

        return X_PADDING + ARROW_HEIGHT * 2;

    }

    public int getIconHeight() {

        return ARROW_HEIGHT + 2;

    }

    private Color getColor() {

        if (color != null) {

            return color;

        }

        return UIManager.getColor(colorKey);

    }

}