1/*
2 * Copyright (c) 2005, 2006, 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
26package sun.tools.jconsole;
27
28import java.awt.*;
29
30import javax.accessibility.*;
31import javax.swing.*;
32import javax.swing.border.*;
33import javax.swing.tree.*;
34
35import sun.tools.jconsole.inspector.*;
36
37import static java.lang.Math.*;
38
39/**
40 * Miscellaneous utility methods for JConsole
41 */
42public class Utilities {
43    private static final String windowsLaF =
44        "com.sun.java.swing.plaf.windows.WindowsLookAndFeel";
45
46    public static void updateTransparency(JComponent comp) {
47        LookAndFeel laf = UIManager.getLookAndFeel();
48        boolean transparent = laf.getClass().getName().equals(windowsLaF);
49        setTabbedPaneTransparency(comp, transparent);
50    }
51
52    private static void setTabbedPaneTransparency(JComponent comp, boolean transparent) {
53        for (Component child : comp.getComponents()) {
54            if (comp instanceof JTabbedPane) {
55                setTransparency((JComponent)child, transparent);
56            } else if (child instanceof JComponent) {
57                setTabbedPaneTransparency((JComponent)child, transparent);
58            }
59        }
60    }
61
62    private static void setTransparency(JComponent comp, boolean transparent) {
63        comp.setOpaque(!transparent);
64        for (Component child : comp.getComponents()) {
65            if (child instanceof JPanel ||
66                child instanceof JSplitPane ||
67                child instanceof JScrollPane ||
68                child instanceof JViewport ||
69                child instanceof JCheckBox) {
70
71                setTransparency((JComponent)child, transparent);
72            }
73            if (child instanceof XTree) {
74                XTree t = (XTree)child;
75                DefaultTreeCellRenderer cr = (DefaultTreeCellRenderer)t.getCellRenderer();
76
77                cr.setBackground(null);
78                cr.setBackgroundNonSelectionColor(new Color(0, 0, 0, 1));
79                t.setCellRenderer(cr);
80                setTransparency((JComponent)child, transparent);
81            }
82        }
83    }
84
85
86    /**
87     * A slightly modified border for JScrollPane to be used with a JTable inside
88     * a JTabbedPane. It has only top part and the rest is clipped to make the
89     * overall border less thick.
90     * The top border helps differentiating the containing table from its container.
91     */
92    public static JScrollPane newTableScrollPane(JComponent comp) {
93        return new TableScrollPane(comp);
94    }
95
96    @SuppressWarnings("serial")
97    private static class TableScrollPane extends JScrollPane {
98        public TableScrollPane(JComponent comp) {
99            super(comp);
100        }
101
102        protected void paintBorder(Graphics g) {
103            Border border = getBorder();
104            if (border != null) {
105                Insets insets = border.getBorderInsets(this);
106                if (insets != null) {
107                    Shape oldClip = g.getClip();
108                    g.clipRect(0, 0, getWidth(), insets.top);
109                    super.paintBorder(g);
110                    g.setClip(oldClip);
111                }
112            }
113        }
114    }
115
116    public static void setAccessibleName(Accessible comp, String name) {
117        comp.getAccessibleContext().setAccessibleName(name);
118    }
119
120    public static void setAccessibleDescription(Accessible comp, String description) {
121        comp.getAccessibleContext().setAccessibleDescription(description);
122    }
123
124
125    /**
126     * Modifies color c1 to ensure it has acceptable contrast
127     * relative to color c2.
128     *
129     * http://www.w3.org/TR/AERT#color-contrast
130     * http://www.cs.rit.edu/~ncs/color/t_convert.html#RGB%20to%20YIQ%20&%20YIQ%20to%20RGB
131     */
132    public static Color ensureContrast(Color c1, Color c2) {
133        double y1 = getColorBrightness(c1);
134        double y2 = getColorBrightness(c2);
135
136        if (abs(y1 - y2) < 125.0) {
137            if (y2 < 128.0) {
138                c1 = setColorBrightness(c1, y2 + 125.0);
139            } else {
140                c1 = setColorBrightness(c1, y2 - 125.0);
141            }
142        }
143
144        return c1;
145    }
146
147    public static double getColorBrightness(Color c) {
148        // Convert RGB -> YIQ and return the Y value
149        return (c.getRed() * 0.299 + c.getGreen() * 0.587 + c.getBlue() * 0.114);
150    }
151
152    private static Color setColorBrightness(Color c, double y) {
153        // Convert YIQ -> RGB
154        double i = (c.getRed() * 0.596 - c.getGreen() * 0.275 - c.getBlue() * 0.321);
155        double q = (c.getRed() * 0.212 - c.getGreen() * 0.523 + c.getBlue() * 0.311);
156
157        // Keep values in legal range. This may reduce the
158        // achieved contrast somewhat.
159        int r = max(0, min(255, (int)round(y + i * 0.956 + q * 0.621)));
160        int g = max(0, min(255, (int)round(y - i * 0.272 - q * 0.647)));
161        int b = max(0, min(255, (int)round(y - i * 1.105 + q * 1.702)));
162
163        return new Color(r, g, b);
164    }
165
166}
167