/*

 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 *   - Redistributions of source code must retain the above copyright

 *     notice, this list of conditions and the following disclaimer.

 *

 *   - Redistributions in binary form must reproduce the above copyright

 *     notice, this list of conditions and the following disclaimer in the

 *     documentation and/or other materials provided with the distribution.

 *

 *   - Neither the name of Oracle nor the names of its

 *     contributors may be used to endorse or promote products derived

 *     from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS

 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,

 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR

 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF

 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING

 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS

 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

/*

 * This source code is provided to illustrate the usage of a given feature

 * or technique and has been deliberately simplified. Additional steps

 * required for a production-quality application, such as security checks,

 * input validation and proper error handling, might not be present in

 * this sample code.

 */

import javax.swing.Icon;

import javax.swing.ImageIcon;

import javax.swing.JLabel;

import javax.swing.JTree;

import javax.swing.tree.TreeCellRenderer;

import javax.swing.tree.DefaultMutableTreeNode;

import java.awt.Component;

import java.awt.Color;

import java.awt.Font;

import java.awt.Graphics;

import javax.swing.UIManager;

@SuppressWarnings("serial")

public class SampleTreeCellRenderer extends JLabel implements TreeCellRenderer {

    /** Font used if the string to be displayed isn't a font. */

    protected static Font defaultFont;

    /** Icon to use when the item is collapsed. */

    protected static ImageIcon collapsedIcon;

    /** Icon to use when the item is expanded. */

    protected static ImageIcon expandedIcon;

    /** Color to use for the background when selected. */

    protected static final Color SELECTED_BACKGROUND_COLOR;

    static {

        if ("Nimbus".equals(UIManager.getLookAndFeel().getName())) {

            SELECTED_BACKGROUND_COLOR = new Color(0, 0,

                0, 0);

        } else {

            SELECTED_BACKGROUND_COLOR = Color.YELLOW;

        }

        try {

            defaultFont = new Font("SansSerif", 0, 12);

        } catch (Exception e) {

        }

        try {

            collapsedIcon = new ImageIcon(SampleTreeCellRenderer.class.

                    getResource("/resources/images/collapsed.gif"));

            expandedIcon = new ImageIcon(SampleTreeCellRenderer.class.

                    getResource("/resources/images/expanded.gif"));

        } catch (Exception e) {

            System.out.println("Couldn't load images: " + e);

        }

    }

    /** Whether or not the item that was last configured is selected. */

    protected boolean selected;

    /**

     * This is messaged from JTree whenever it needs to get the size

     * of the component or it wants to draw it.

     * This attempts to set the font based on value, which will be

     * a TreeNode.

     */

    public Component getTreeCellRendererComponent(JTree tree, Object value,

            boolean selected, boolean expanded,

            boolean leaf, int row,

            boolean hasFocus) {

        String stringValue = tree.convertValueToText(value, selected,

                expanded, leaf, row, hasFocus);

        /* Set the text. */

        setText(stringValue);

        /* Tooltips used by the tree. */

        setToolTipText(stringValue);

        /* Set the image. */

        if (expanded) {

            setIcon(expandedIcon);

        } else if (!leaf) {

            setIcon(collapsedIcon);

        } else {

            setIcon(null);

        }

        /* Set the color and the font based on the SampleData userObject. */

        SampleData userObject = (SampleData) ((DefaultMutableTreeNode) value).

                getUserObject();

        if (hasFocus) {

            setForeground(UIManager.getColor("Tree.selectionForeground"));

        } else {

            setForeground(userObject.getColor());

        }

        if (userObject.getFont() == null) {

            setFont(defaultFont);

        } else {

            setFont(userObject.getFont());

        }

        /* Update the selected flag for the next paint. */

        this.selected = selected;

        return this;

    }

    /**

     * paint is subclassed to draw the background correctly.  JLabel

     * currently does not allow backgrounds other than white, and it

     * will also fill behind the icon.  Something that isn't desirable.

     */

    @Override

    public void paint(Graphics g) {

        Color bColor;

        Icon currentI = getIcon();

        if (selected) {

            bColor = SELECTED_BACKGROUND_COLOR;

        } else if (getParent() != null) /* Pick background color up from parent (which will come from

        the JTree we're contained in). */ {

            bColor = getParent().getBackground();

        } else {

            bColor = getBackground();

        }

        g.setColor(bColor);

        if (currentI != null && getText() != null) {

            int offset = (currentI.getIconWidth() + getIconTextGap());

            if (getComponentOrientation().isLeftToRight()) {

                g.fillRect(offset, 0, getWidth() - 1 - offset,

                        getHeight() - 1);

            } else {

                g.fillRect(0, 0, getWidth() - 1 - offset, getHeight() - 1);

            }

        } else {

            g.fillRect(0, 0, getWidth() - 1, getHeight() - 1);

        }

        super.paint(g);

    }

}