Programming Languages Suite/JBuilder8.iso/Solaris/resource/jre/demo/jfc/SampleTree/src/SampleTreeCellRenderer.java

Java Source | 2002-09-06 | 5.4 KB | 158 lines

/*
 * Copyright (c) 2002 Sun Microsystems, Inc. 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.
 *
 * -Redistribution in binary form must reproduct 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 Sun Microsystems, Inc. or the names of contributors
 * may be used to endorse or promote products derived from this software
 * without specific prior written permission.
 *
 * This software is provided "AS IS," without a warranty of any kind. ALL
 * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING
 * ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
 * OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND ITS LICENSORS SHALL NOT
 * BE LIABLE FOR ANY DAMAGES OR LIABILITIES SUFFERED BY LICENSEE AS A RESULT
 * OF OR RELATING TO USE, MODIFICATION OR DISTRIBUTION OF THE SOFTWARE OR ITS
 * DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR ANY LOST
 * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL,
 * INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY
 * OF LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE SOFTWARE, EVEN
 * IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
 *
 * You acknowledge that Software is not designed, licensed or intended for
 * use in the design, construction, operation or maintenance of any nuclear
 * facility.
 */

/*
 * @(#)SampleTreeCellRenderer.java    1.15 02/06/13
 */

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;

public class SampleTreeCellRenderer extends JLabel implements TreeCellRenderer
{
    /** Font used if the string to be displayed isn't a font. */
    static protected Font             defaultFont;
    /** Icon to use when the item is collapsed. */
    static protected ImageIcon        collapsedIcon;
    /** Icon to use when the item is expanded. */
    static protected ImageIcon        expandedIcon;

    /** Color to use for the background when selected. */
    static protected final Color SelectedBackgroundColor = Color.yellow;//new Color(0, 0, 128);

    static
    {
    try {
        defaultFont = new Font("SansSerif", 0, 12);
    } catch (Exception e) {}
    try {
        collapsedIcon = new ImageIcon("images/collapsed.gif");
        expandedIcon = new ImageIcon("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) {
    Font            font;
    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(Color.cyan);
    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.
      */
    public void paint(Graphics g) {
    Color            bColor;
    Icon             currentI = getIcon();

    if(selected)
        bColor = SelectedBackgroundColor;
    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);
    }
}