001/*
002 * $Id: TreeRolloverController.java 3100 2008-10-14 22:33:10Z rah003 $
003 *
004 * Copyright 2008 Sun Microsystems, Inc., 4150 Network Circle,
005 * Santa Clara, California 95054, U.S.A. All rights reserved.
006 *
007 * This library is free software; you can redistribute it and/or
008 * modify it under the terms of the GNU Lesser General Public
009 * License as published by the Free Software Foundation; either
010 * version 2.1 of the License, or (at your option) any later version.
011 *
012 * This library is distributed in the hope that it will be useful,
013 * but WITHOUT ANY WARRANTY; without even the implied warranty of
014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
015 * Lesser General Public License for more details.
016 *
017 * You should have received a copy of the GNU Lesser General Public
018 * License along with this library; if not, write to the Free Software
019 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
020 */
021package org.jdesktop.swingx.rollover;
022
023import java.awt.Cursor;
024import java.awt.Point;
025import java.awt.Rectangle;
026
027import javax.swing.JTree;
028import javax.swing.tree.TreeCellRenderer;
029import javax.swing.tree.TreePath;
030
031
032/**
033     * listens to rollover properties. 
034     * Repaints effected component regions.
035     * Updates link cursor.
036     * 
037     * @author Jeanette Winzenburg
038     */
039    public class TreeRolloverController<T extends JTree>  extends RolloverController<T> {
040    
041        private Cursor oldCursor;
042        
043//    -------------------------------------JTree rollover
044        
045        @Override
046        protected void rollover(Point oldLocation, Point newLocation) {
047            // JW: conditional repaint not working?
048//            component.repaint();
049            if (oldLocation != null) {
050                Rectangle r = component.getRowBounds(oldLocation.y);
051                if (r != null) {
052                    r.x = 0;
053                    r.width = component.getWidth();
054                    component.repaint(r);
055                }
056            }
057            if (newLocation != null) {
058                Rectangle r = component.getRowBounds(newLocation.y);
059                if (r != null) {
060                    r.x = 0;
061                    r.width = component.getWidth();
062                    component.repaint(r);
063                }
064            }
065            setRolloverCursor(newLocation);
066        }
067
068
069        private void setRolloverCursor(Point location) {
070            if (hasRollover(location)) {
071                if (oldCursor == null) {
072                    oldCursor = component.getCursor();
073                    component.setCursor(Cursor
074                            .getPredefinedCursor(Cursor.HAND_CURSOR));
075                }
076            } else {
077                if (oldCursor != null) {
078                    component.setCursor(oldCursor);
079                    oldCursor = null;
080                }
081            }
082
083        }
084
085
086        @Override
087        protected RolloverRenderer getRolloverRenderer(Point location, boolean prepare) {
088            TreeCellRenderer renderer = component.getCellRenderer();
089            RolloverRenderer rollover = renderer instanceof RolloverRenderer 
090                ? (RolloverRenderer) renderer : null;
091            if ((rollover != null) && !rollover.isEnabled()) {
092                rollover = null;
093            }
094            if ((rollover != null) && prepare) {
095                TreePath path = component.getPathForRow(location.y);
096                Object element = path != null ? path.getLastPathComponent() : null;
097                renderer.getTreeCellRendererComponent(component, element, false, 
098                        false, false, 
099                        location.y, false);
100            }
101            return rollover;
102        }
103
104
105        @Override
106        protected Point getFocusedCell() {
107            // TODO Auto-generated method stub
108            return null;
109        }
110
111    }