/* * Copyright (c) 2005, 2006, 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.tools.jconsole; import java.awt.*; import javax.accessibility.*;import javax.swing.*;import javax.swing.border.*;import javax.swing.tree.*; import sun.tools.jconsole.inspector.*; import static java.lang.Math.*; /** * Miscellaneous utility methods for JConsole */public class Utilities {    private static final String windowsLaF =        "com.sun.java.swing.plaf.windows.WindowsLookAndFeel";     public static void updateTransparency(JComponent comp) {        LookAndFeel laf = UIManager.getLookAndFeel();        boolean transparent = laf.getClass().getName().equals(windowsLaF);        setTabbedPaneTransparency(comp, transparent);    }     private static void setTabbedPaneTransparency(JComponent comp, boolean transparent) {        for (Component child : comp.getComponents()) {            if (comp instanceof JTabbedPane) {                setTransparency((JComponent)child, transparent);            } else if (child instanceof JComponent) {                setTabbedPaneTransparency((JComponent)child, transparent);            }        }    }     private static void setTransparency(JComponent comp, boolean transparent) {        comp.setOpaque(!transparent);        for (Component child : comp.getComponents()) {            if (child instanceof JPanel ||                child instanceof JSplitPane ||                child instanceof JScrollPane ||                child instanceof JViewport ||                child instanceof JCheckBox) {                 setTransparency((JComponent)child, transparent);            }            if (child instanceof XTree) {                XTree t = (XTree)child;                DefaultTreeCellRenderer cr = (DefaultTreeCellRenderer)t.getCellRenderer();                 cr.setBackground(null);                cr.setBackgroundNonSelectionColor(new Color(0, 0, 0, 1));                t.setCellRenderer(cr);                setTransparency((JComponent)child, transparent);            }        }    }      /**     * A slightly modified border for JScrollPane to be used with a JTable inside     * a JTabbedPane. It has only top part and the rest is clipped to make the     * overall border less thick.     * The top border helps differentiating the containing table from its container.     */    public static JScrollPane newTableScrollPane(JComponent comp) {        return new TableScrollPane(comp);    }     @SuppressWarnings("serial")    private static class TableScrollPane extends JScrollPane {        public TableScrollPane(JComponent comp) {            super(comp);        }         protected void paintBorder(Graphics g) {            Border border = getBorder();            if (border != null) {                Insets insets = border.getBorderInsets(this);                if (insets != null) {                    Shape oldClip = g.getClip();                    g.clipRect(0, 0, getWidth(), insets.top);                    super.paintBorder(g);                    g.setClip(oldClip);                }            }        }    }     public static void setAccessibleName(Accessible comp, String name) {        comp.getAccessibleContext().setAccessibleName(name);    }     public static void setAccessibleDescription(Accessible comp, String description) {        comp.getAccessibleContext().setAccessibleDescription(description);    }      /**     * Modifies color c1 to ensure it has acceptable contrast     * relative to color c2.     *     * http://www.w3.org/TR/AERT#color-contrast     * http://www.cs.rit.edu/~ncs/color/t_convert.html#RGB%20to%20YIQ%20&%20YIQ%20to%20RGB     */    public static Color ensureContrast(Color c1, Color c2) {        double y1 = getColorBrightness(c1);        double y2 = getColorBrightness(c2);         if (abs(y1 - y2) < 125.0) {            if (y2 < 128.0) {                c1 = setColorBrightness(c1, y2 + 125.0);            } else {                c1 = setColorBrightness(c1, y2 - 125.0);            }        }         return c1;    }     public static double getColorBrightness(Color c) {        // Convert RGB -> YIQ and return the Y value        return (c.getRed() * 0.299 + c.getGreen() * 0.587 + c.getBlue() * 0.114);    }     private static Color setColorBrightness(Color c, double y) {        // Convert YIQ -> RGB        double i = (c.getRed() * 0.596 - c.getGreen() * 0.275 - c.getBlue() * 0.321);        double q = (c.getRed() * 0.212 - c.getGreen() * 0.523 + c.getBlue() * 0.311);         // Keep values in legal range. This may reduce the        // achieved contrast somewhat.        int r = max(0, min(255, (int)round(y + i * 0.956 + q * 0.621)));        int g = max(0, min(255, (int)round(y - i * 0.272 - q * 0.647)));        int b = max(0, min(255, (int)round(y - i * 1.105 + q * 1.702)));         return new Color(r, g, b);    } }