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The JGoodies Looks make your Swing applications and applets look better. They have been optimized for readability, precise micro-design and usability. And they simplify the multi-platform support by using similar widget dimensions. In addition, many people have reviewed them as elegant.

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/*
 * Copyright (c) 2001-2012 JGoodies Karsten Lentzsch. All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *  o Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 *  o 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.
 *
 *  o Neither the name of JGoodies Karsten Lentzsch 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.
 */

package com.jgoodies.looks.plastic;

import java.awt.Component;
import java.awt.Graphics;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;

import javax.swing.Icon;
import javax.swing.JComponent;
import javax.swing.plaf.ComponentUI;
import javax.swing.plaf.basic.BasicTreeUI;

import com.jgoodies.looks.Options;

/**
 * The JGoodies Plastic Look&Feel implementation of {@code TreeUI}.
 * It provides two line styles: angled dashed lines, or no lines at all.
 * By default, lines are drawn.
 * 

* You can change the line style by setting a client property. * The property key and values are a subset of the values used * by the Metal L&F tree. To hide lines use one of the following: *

 * JTree tree1 = new JTree();
 * tree1.putClientProperty("JTree.lineStyle", "None");
 *
 * JTree tree2 = new JTree();
 * tree1.putClientProperty(Options.TREE_LINE_STYLE_KEY,
 *                         Options.TREE_LINE_STYLE_NONE_VALUE);
 * 
* * Although lines are shown by default, you could code: *
 * JTree tree1 = new JTree();
 * tree1.putClientProperty("JTree.lineStyle", "Angled");
 *
 * JTree tree2 = new JTree();
 * tree1.putClientProperty(Options.TREE_LINE_STYLE_KEY,
 *                         Options.TREE_LINE_STYLE_ANGLED_VALUE);
 * 
* * @author Karsten Lentzsch * @version $Revision: 1.9 $ */ public final class PlasticTreeUI extends BasicTreeUI { private boolean linesEnabled = true; private PropertyChangeListener lineStyleHandler; public static ComponentUI createUI(JComponent b) { return new PlasticTreeUI(); } // Installation *********************************************************** @Override public void installUI(JComponent c) { super.installUI(c); updateLineStyle(c.getClientProperty(Options.TREE_LINE_STYLE_KEY)); lineStyleHandler = new LineStyleHandler(); c.addPropertyChangeListener(lineStyleHandler); } @Override public void uninstallUI(JComponent c) { c.removePropertyChangeListener(lineStyleHandler); super.uninstallUI(c); } // Painting *************************************************************** @Override protected void paintVerticalLine(Graphics g, JComponent c, int x, int top, int bottom) { if (linesEnabled) { drawDashedVerticalLine(g, x, top, bottom); } } @Override protected void paintHorizontalLine(Graphics g, JComponent c, int y, int left, int right) { if (linesEnabled) { drawDashedHorizontalLine(g, y, left, right); } } // Draws the icon centered at (x,y) @Override protected void drawCentered(Component c, Graphics graphics, Icon icon, int x, int y) { icon.paintIcon( c, graphics, x - icon.getIconWidth() / 2 - 1, y - icon.getIconHeight() / 2); } // Helper Code ************************************************************ private void updateLineStyle(Object lineStyle) { linesEnabled = !Options.TREE_LINE_STYLE_NONE_VALUE.equals(lineStyle); } // Listens for changes of the line style property private class LineStyleHandler implements PropertyChangeListener { @Override public void propertyChange(PropertyChangeEvent e) { String name = e.getPropertyName(); Object value = e.getNewValue(); if (name.equals(Options.TREE_LINE_STYLE_KEY)) { updateLineStyle(value); } } } }




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