/*

 * 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);

    }

}