swingx-master/swingx-core/src/main/java/org/jdesktop/swingx/renderer/DefaultTreeRenderer.java
/*
 * $Id$
 *
 * Copyright 2006 Sun Microsystems, Inc., 4150 Network Circle,
 * Santa Clara, California 95054, U.S.A. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library 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
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
package org.jdesktop.swingx.renderer;


import java.awt.Component;

import javax.swing.JTree;
import javax.swing.tree.TreeCellRenderer;


/**
 * Adapter to glue SwingX renderer support to core api.
 * <p>
 * 
 * 
 * @author Jeanette Winzenburg
 * 
 * 
 */
public class DefaultTreeRenderer extends AbstractRenderer
        implements TreeCellRenderer {

    private TreeCellContext cellContext;
    
    /**
     * Instantiates a default tree renderer with the default component
     * provider. 
     * 
     */
    public DefaultTreeRenderer() {
        this((ComponentProvider<?>)null);
    }


    /**
     * Instantiates a default tree renderer with the given component provider.
     * If the controller is null, creates and uses a default. The default
     * controller is of type <code>WrappingProvider</code>.
     * 
     * @param componentProvider the provider of the configured component to
     *        use for cell rendering
     */
    public DefaultTreeRenderer(ComponentProvider<?> componentProvider) {
        super(componentProvider);
        this.cellContext = new TreeCellContext();
    }

    /**
     * Instantiates a default tree renderer with the default
     * wrapping provider, using the given IconValue for 
     * customizing the icons.
     * 
     * @param iv the IconValue to use for mapping a custom icon 
     *    for a given value
     *   
     */
    public DefaultTreeRenderer(IconValue iv) {
        this(new WrappingProvider(iv));
    }

    /**
     * Instantiates a default tree renderer with a default component
     * provider using the given converter. 
     * 
     * @param sv the converter to use for mapping the
     *   content value to a String representation.
     *   
     */
    public DefaultTreeRenderer(StringValue sv) {
        this(new WrappingProvider(sv));
    }


    /**
     * Instantiates a default tree renderer with the default
     * wrapping provider, using the given IconValue for 
     * customizing the icons and the given StringValue for
     * node content.
     * 
     * @param iv the IconValue to use for mapping a custom icon 
     *    for a given value
     * @param sv the converter to use for mapping the
     *   content value to a String representation.
     *   
     */
    public DefaultTreeRenderer(IconValue iv, StringValue sv) {
        this(new WrappingProvider(iv, sv));
    }

    /**
     * Instantiates a default tree renderer with the default
     * wrapping provider, using the given IconValue for 
     * customizing the icons and the given StringValue for
     * node content.
     * 
     * @param iv the IconValue to use for mapping a custom icon 
     *    for a given value
     * @param sv the converter to use for mapping the
     *   content value to a String representation.
     * @param unwrapUserObject a flag indicating whether this provider
     *     should auto-unwrap the userObject from the context value. 
     *   
     */
    public DefaultTreeRenderer(IconValue iv, StringValue sv, boolean unwrapUserObject) {
        this(new WrappingProvider(iv, sv, unwrapUserObject));
    }
    
    // -------------- implements javax.swing.table.TableCellRenderer
    /**
     * 
     * Returns a configured component, appropriate to render the given tree
     * cell. <p>
     * 
     * @param tree the <code>JTree</code>
     * @param value the value to assign to the cell
     * @param selected true if cell is selected
     * @param expanded true if the cell is expanded
     * @param leaf true if the cell is a leaf
     * @param hasFocus true if cell has focus
     * @param row the row of the cell to render
     * @return a component to render the given list cell.
     */
    @Override
    public Component getTreeCellRendererComponent(JTree tree, Object value,
            boolean selected, boolean expanded, boolean leaf, int row,
            boolean hasFocus) {
        cellContext.installContext(tree, value, row, 0, selected, hasFocus,
                expanded, leaf);
        Component comp = componentController.getRendererComponent(cellContext);
        // fix issue #1040-swingx: memory leak if value not released
        cellContext.replaceValue(null);
        return comp;
    }


    /**
     * {@inheritDoc}
     */ 
    @Override
    protected ComponentProvider<?> createDefaultComponentProvider() {
        return new WrappingProvider();
    }


}


