linklabel.java

JMule是一个基于Java开发

/*
 *  JMule - Java file sharing client
 *  Copyright (C) 2007-2008 JMule team ( [e-mail] / http://jmule.org )
 *
 *  Any parts of this program derived from other projects, or contributed
 *  by third-party developers are copyrighted by their respective authors.
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License
 *  as published by the Free Software Foundation; either version 2
 *  of the License, or (at your option) any later version.
 *
 *  This program 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 for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 */
package org.jmule.ui.swing.common;

import java.awt.Color;
import java.awt.Cursor;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;

import javax.swing.Action;
import javax.swing.JLabel;
import javax.swing.UIManager;


/**
 * 
 * A simple Label that offers rollover effect and a action that is triggered when 
 * clicked on.
 * @author gregork
 * @author javajox
 * @version $$Revision: 1.1 $$
 * Last changed by $$Author: javajox $$ on $$Date: 2008/07/31 16:44:43 $$
 */

public class LinkLabel extends JLabel implements MouseListener
{
    private boolean isFontBold;
    private boolean isRollover;
    private Action action;
    
    /**
     * Create a new link label.
     * @param text the text to display.
     * @param linkAction the action to trigger when clicked on.
     */
    public LinkLabel( JMSAction linkAction )
    {
        super( (String)linkAction.getValue( JMSAction.NAME ) );
        action = linkAction;
        registerActionChangeListener(action);
        setToolTipText( (String)action.getValue( JMSAction.TOOL_TIP_TEXT ) );
        setEnabled( action.isEnabled() );
        isRollover = false;
        isFontBold = false;
        addMouseListener( this );
        setCursor( Cursor.getPredefinedCursor( Cursor.HAND_CURSOR ) );
    }
    
    public void paintComponent( Graphics g )
    {
        super.paintComponent(g);
        if ( isEnabled() )
        {
            g.drawLine( 0, getHeight()-2, getWidth(), getHeight()-2);
            // for disabled line drawing we could use this.. put for now just dont
            // draw disabled lines
            //g.setColor( UIManager.getColor("Label.disabledForeground") );
        }
    }
    
    
    public void setFontBold( boolean isBold )
    {
        isFontBold = isBold;
        
        Font currentFont = getFont();
        if ( currentFont.isBold() != isFontBold )
        {
            if ( isFontBold )
            {
                setFont( UIManager.getFont("Label.font").deriveFont( Font.BOLD ) );
            }
            else
            {
                setFont( UIManager.getFont("Label.font") );
            }
        }
    }
    
    public void initialize()
    {
        setFontBold( isFontBold );
    }
    
    public void updateUI()
    {
        super.updateUI();
        initialize();
    }
    
    public Color getForeground()
    {
        if ( isRollover )
        {
            //return PhexColors.getLinkLabelRolloverForeground();
        	return new Color( 0x0000FF );
        }
        else
        {
            return super.getForeground();
        }
    }
    
    // TODO3 if btn needs to be removed... unregister!
    private void registerActionChangeListener( Action a )
    {
        PropertyChangeListener actionPropertyChangeListener = new ActionChangedListener();
        a.addPropertyChangeListener(actionPropertyChangeListener);
    }

    public void mouseEntered(MouseEvent e)
    {
        isRollover = true;
        repaint();
    }

    public void mouseExited(MouseEvent e)
    {
        isRollover = false;
        repaint();
    }

    public void mouseClicked(MouseEvent e)
    {
        if ( action != null )
        {
            action.actionPerformed( new ActionEvent( this, 0, "" ) );
        }
    }
    
    public void mousePressed(MouseEvent e)
    {}
    public void mouseReleased(MouseEvent e)
    {}
    
    private class ActionChangedListener implements PropertyChangeListener
    {
        ActionChangedListener( )
        {
            super();
        }

        public void propertyChange(PropertyChangeEvent e)
        {
            String propertyName = e.getPropertyName();
            if ( propertyName.equals(Action.NAME))
            {
                String text = (String) e.getNewValue();
                setText( text );
                repaint();
            }
            else if ( propertyName.equals("enabled"))
            {
                Boolean enabledState = (Boolean) e.getNewValue();
                setEnabled(enabledState.booleanValue());
                repaint();
            }
            else if ( propertyName.equals( JMSAction.TOOL_TIP_TEXT ))
            {
                String text = (String) e.getNewValue();
                setToolTipText( text );
                repaint();
            }
        }
    }
}