/*
 * Copyright (c) 1997, 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 javax.swing.tree;

import java.awt.Component;
import javax.swing.JTree;

Defines the requirements for an object that displays a tree node.
See How to Use Trees
in The Java Tutorial
for an example of implementing a tree cell renderer
that displays custom icons.
Author:
Rob Davis, Ray Ryan, Scott Violet/**
 * Defines the requirements for an object that displays a tree node.
 * See <a
 href="http://java.sun.com/docs/books/tutorial/uiswing/components/tree.html">How to Use Trees</a>
 * in <em>The Java Tutorial</em>
 * for an example of implementing a tree cell renderer
 * that displays custom icons.
 *
 * @author Rob Davis
 * @author Ray Ryan
 * @author Scott Violet
 */
public interface TreeCellRenderer {

    
Sets the value of the current tree cell to value.
If selected is true, the cell will be drawn as if
selected. If expanded is true the node is currently
expanded and if leaf is true the node represents a
leaf and if hasFocus is true the node currently has
focus. tree is the JTree the receiver is being
configured for.  Returns the Component that the renderer
uses to draw the value.

The TreeCellRenderer is also responsible for rendering the
the cell representing the tree's current DnD drop location if
it has one. If this renderer cares about rendering
the DnD drop location, it should query the tree directly to
see if the given row represents the drop location:
    JTree.DropLocation dropLocation = tree.getDropLocation();
    if (dropLocation != null
            && dropLocation.getChildIndex() == -1
            && tree.getRowForPath(dropLocation.getPath()) == row) {
        // this row represents the current drop location
        // so render it specially, perhaps with a different color
    }

Returns:
 the Component that the renderer uses to draw the value/**
     * Sets the value of the current tree cell to <code>value</code>.
     * If <code>selected</code> is true, the cell will be drawn as if
     * selected. If <code>expanded</code> is true the node is currently
     * expanded and if <code>leaf</code> is true the node represents a
     * leaf and if <code>hasFocus</code> is true the node currently has
     * focus. <code>tree</code> is the <code>JTree</code> the receiver is being
     * configured for.  Returns the <code>Component</code> that the renderer
     * uses to draw the value.
     * <p>
     * The <code>TreeCellRenderer</code> is also responsible for rendering the
     * the cell representing the tree's current DnD drop location if
     * it has one. If this renderer cares about rendering
     * the DnD drop location, it should query the tree directly to
     * see if the given row represents the drop location:
     * <pre>
     *     JTree.DropLocation dropLocation = tree.getDropLocation();
     *     if (dropLocation != null
     *             && dropLocation.getChildIndex() == -1
     *             && tree.getRowForPath(dropLocation.getPath()) == row) {
     *
     *         // this row represents the current drop location
     *         // so render it specially, perhaps with a different color
     *     }
     * </pre>
     *
     * @return  the <code>Component</code> that the renderer uses to draw the value
     */
    Component getTreeCellRendererComponent(JTree tree, Object value,
                                   boolean selected, boolean expanded,
                                   boolean leaf, int row, boolean hasFocus);

}