1 /*
   2  * Copyright (c) 2005, 2014, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 package sun.swing.icon;
  26 
  27 import java.awt.Color;
  28 import java.awt.Component;
  29 import java.awt.Graphics;
  30 import java.io.Serializable;
  31 import javax.swing.Icon;
  32 import javax.swing.UIManager;
  33 import javax.swing.plaf.UIResource;
  34 
  35 /**
  36  * Sorting icon.
  37  *
  38  */
  39 @SuppressWarnings("serial") // JDK-implementation class
  40 public class SortArrowIcon implements Icon, UIResource, Serializable {
  41     // Height of the arrow, the width is ARROW_HEIGHT
  42     private static final int ARROW_HEIGHT = 5;
  43 
  44     // Amount of pad to left of arrow
  45     private static final int X_PADDING = 7;
  46 
  47     // Sort direction
  48     private boolean ascending;
  49 
  50     // The Color to use, may be null indicating colorKey should be used
  51     private Color color;
  52 
  53     // If non-null indicates the color should come from the UIManager with
  54     // this key.
  55     private String colorKey;
  56 
  57     /**
  58      * Creates a <code>SortArrowIcon</code>.
  59      *
  60      * @param ascending if true, icon respresenting ascending sort, otherwise
  61      *        descending
  62      * @param color the color to render the icon
  63      */
  64     public SortArrowIcon(boolean ascending, Color color) {
  65         this.ascending = ascending;
  66         this.color = color;
  67         if (color == null) {
  68             throw new IllegalArgumentException();
  69         }
  70     }
  71 
  72     /**
  73      * Creates a <code>SortArrowIcon</code>.
  74      *
  75      * @param ascending if true, icon respresenting ascending sort, otherwise
  76      *        descending
  77      * @param colorKey the key used to find color in UIManager
  78      */
  79     public SortArrowIcon(boolean ascending, String colorKey) {
  80         this.ascending = ascending;
  81         this.colorKey = colorKey;
  82         if (colorKey == null) {
  83             throw new IllegalArgumentException();
  84         }
  85     }
  86 
  87     public void paintIcon(Component c, Graphics g, int x, int y) {
  88         g.setColor(getColor());
  89         int startX = X_PADDING + x + ARROW_HEIGHT / 2;
  90         if (ascending) {
  91             int startY = y;
  92             g.fillRect(startX, startY, 1, 1);
  93             for (int line = 1; line < ARROW_HEIGHT; line++) {
  94                 g.fillRect(startX - line, startY + line,
  95                            line + line + 1, 1);
  96             }
  97         }
  98         else {
  99             int startY = y + ARROW_HEIGHT - 1;
 100             g.fillRect(startX, startY, 1, 1);
 101             for (int line = 1; line < ARROW_HEIGHT; line++) {
 102                 g.fillRect(startX - line, startY - line,
 103                            line + line + 1, 1);
 104             }
 105         }
 106     }
 107 
 108     public int getIconWidth() {
 109         return X_PADDING + ARROW_HEIGHT * 2;
 110     }
 111 
 112     public int getIconHeight() {
 113         return ARROW_HEIGHT + 2;
 114     }
 115 
 116     private Color getColor() {
 117         if (color != null) {
 118             return color;
 119         }
 120         return UIManager.getColor(colorKey);
 121     }
 122 }