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
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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
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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      */
SortArrowIcon(boolean ascending, Color color)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      */
SortArrowIcon(boolean ascending, String colorKey)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 
paintIcon(Component c, Graphics g, int x, int y)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 
getIconWidth()107     public int getIconWidth() {
108         return X_PADDING + ARROW_HEIGHT * 2;
109     }
110 
getIconHeight()111     public int getIconHeight() {
112         return ARROW_HEIGHT + 2;
113     }
114 
getColor()115     private Color getColor() {
116         if (color != null) {
117             return color;
118         }
119         return UIManager.getColor(colorKey);
120     }
121 }
122