1 /*
   2  * Copyright (c) 2005, 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 public class SortArrowIcon implements Icon, UIResource, Serializable {
  40     // Height of the arrow, the width is ARROW_HEIGHT
  41     private static final int ARROW_HEIGHT = 5;
  42 
  43     // Amount of pad to left of arrow
  44     private static final int X_PADDING = 7;
  45 
  46     // Sort direction
  47     private boolean ascending;
  48 
  49     // The Color to use, may be null indicating colorKey should be used
  50     private Color color;
  51 
  52     // If non-null indicates the color should come from the UIManager with
  53     // this key.
  54     private String colorKey;
  55 
  56     /**
  57      * Creates a <code>SortArrowIcon</code>.
  58      *
  59      * @param ascending if true, icon respresenting ascending sort, otherwise
  60      *        descending
  61      * @param color the color to render the icon
  62      */
  63     public SortArrowIcon(boolean ascending, Color color) {
  64         this.ascending = ascending;
  65         this.color = color;
  66         if (color == null) {
  67             throw new IllegalArgumentException();
  68         }
  69     }
  70 
  71     /**
  72      * Creates a <code>SortArrowIcon</code>.
  73      *
  74      * @param ascending if true, icon respresenting ascending sort, otherwise
  75      *        descending
  76      * @param colorKey the key used to find color in UIManager
  77      */
  78     public SortArrowIcon(boolean ascending, String colorKey) {
  79         this.ascending = ascending;
  80         this.colorKey = colorKey;
  81         if (colorKey == null) {
  82             throw new IllegalArgumentException();
  83         }
  84     }
  85 
  86     public void paintIcon(Component c, Graphics g, int x, int y) {
  87         g.setColor(getColor());
  88         int startX = X_PADDING + x + ARROW_HEIGHT / 2;
  89         if (ascending) {
  90             int startY = y;
  91             g.fillRect(startX, startY, 1, 1);
  92             for (int line = 1; line < ARROW_HEIGHT; line++) {
  93                 g.fillRect(startX - line, startY + line,
  94                            line + line + 1, 1);
  95             }
  96         }
  97         else {
  98             int startY = y + ARROW_HEIGHT - 1;
  99             g.fillRect(startX, startY, 1, 1);
 100             for (int line = 1; line < ARROW_HEIGHT; line++) {
 101                 g.fillRect(startX - line, startY - line,
 102                            line + line + 1, 1);
 103             }
 104         }
 105     }
 106 
 107     public int getIconWidth() {
 108         return X_PADDING + ARROW_HEIGHT * 2;
 109     }
 110 
 111     public int getIconHeight() {
 112         return ARROW_HEIGHT + 2;
 113     }
 114 
 115     private Color getColor() {
 116         if (color != null) {
 117             return color;
 118         }
 119         return UIManager.getColor(colorKey);
 120     }
 121 }