alvinalexander.com | career | drupal | java | mac | mysql | perl | scala | uml | unix  

What this is

This file is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Other links

The source code

/*
 * RolloverButton.java - Class for buttons that implement rollovers
 * :tabSize=8:indentSize=8:noTabs=false:
 * :folding=explicit:collapseFolds=1:
 *
 * Copyright (C) 2002 Kris Kopicki
 * Portions copyright (C) 2003 Slava Pestov
 *
 * 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 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

package org.gjt.sp.jedit.gui;

//{{{ Imports
import java.awt.*;
import java.awt.event.*;
import java.lang.reflect.Method;
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.plaf.basic.BasicButtonUI;
import org.gjt.sp.jedit.OperatingSystem;
import org.gjt.sp.util.Log;
//}}}

/**
 * If you wish to have rollovers on your buttons, use this class.
 *
 * Unlike the Swing rollover support, this class works outside of
 * JToolBars, and does not require undocumented client
 * property hacks or JDK1.4-specific API calls.

* * Note: You should not call setBorder() on your buttons, * as they probably won't work properly. */ public class RolloverButton extends JButton { //{{{ RolloverButton constructor /** * Setup the border (invisible initially) */ public RolloverButton() { if(OperatingSystem.hasJava15()) setContentAreaFilled(false); if(method != null) { try { method.invoke(this,new Boolean[] { Boolean.TRUE }); } catch(Exception e) { Log.log(Log.ERROR,this,e); } } else { addMouseListener(new MouseOverHandler()); } } //}}} //{{{ RolloverButton constructor /** * Setup the border (invisible initially) */ public RolloverButton(Icon icon) { this(); setIcon(icon); } //}}} //{{{ updateUI() method public void updateUI() { if(OperatingSystem.isWindows()) { /* Workaround for uncooperative Windows L&F */ setUI(new BasicButtonUI()); } else super.updateUI(); setBorder(new EtchedBorder()); setBorderPainted(false); setMargin(new Insets(1,1,1,1)); setRequestFocusEnabled(false); } //}}} //{{{ isOpaque() method public boolean isOpaque() { return false; } //}}} //{{{ setEnabled() method public void setEnabled(boolean b) { super.setEnabled(b); if(method == null) { setBorderPainted(false); repaint(); } } //}}} //{{{ setBorderPainted() method public void setBorderPainted(boolean b) { try { revalidateBlocked = true; super.setBorderPainted(b); } finally { revalidateBlocked = false; } } //}}} //{{{ revalidate() method /** * We block calls to revalidate() from a setBorderPainted(), for * performance reasons. */ public void revalidate() { if(!revalidateBlocked) super.revalidate(); } //}}} //{{{ paint() method public void paint(Graphics g) { if(method != null || isEnabled()) super.paint(g); else { Graphics2D g2 = (Graphics2D)g; g2.setComposite(c); super.paint(g2); } } //}}} //{{{ Private members private static AlphaComposite c = AlphaComposite.getInstance( AlphaComposite.SRC_OVER, 0.5f); private static Method method; private boolean revalidateBlocked; static { /* if(OperatingSystem.hasJava14()) { try { method = RolloverButton.class .getMethod("setRolloverEnabled",new Class[] { boolean.class }); Log.log(Log.DEBUG,RolloverButton.class, "Java 1.4 setRolloverEnabled() method enabled"); } catch(Exception e) { Log.log(Log.ERROR,RolloverButton.class,e); } } */ } //}}} //{{{ MouseHandler class /** * Make the border visible/invisible on rollovers */ class MouseOverHandler extends MouseAdapter { public void mouseEntered(MouseEvent e) { if (isEnabled()) setBorderPainted(true); } public void mouseExited(MouseEvent e) { setBorderPainted(false); } } //}}} }

... this post is sponsored by my books ...

#1 New Release!

FP Best Seller

 

new blog posts

 

Copyright 1998-2021 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.