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/*
Wotonomy: OpenStep design patterns for pure Java applications.
Copyright (C) 2000 Blacksmith, Inc.
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, see http://www.gnu.org
*/
package net.wotonomy.ui.swing.util;
import java.awt.Component;
import java.awt.Container;
import java.awt.Image;
import java.awt.Rectangle;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.net.URL;
import javax.swing.ImageIcon;
import javax.swing.JComponent;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JRootPane;
import javax.swing.SwingUtilities;
import javax.swing.Timer;
/**
* Visually highlights a component with the specified image for a brief period.
*
* @author michael@mpowers.net
* @author $Author: cgruber $
* @version $Revision: 904 $ $Date: 2006-02-18 18:19:05 -0500 (Sat, 18 Feb 2006)
* $
*/
public class ComponentHighlighter implements ActionListener {
// lots of state to track
JRootPane rootPane;
JComponent component;
Component oldGlassPane;
JLabel imageLabel;
Timer timer;
JPanel glassPane;
/**
* Alternate "Fire-and-forget" constructor loads an image from a URL.
*
* @param aComponent A Component that will be highlighted.
* @param aURL A URL pointing to an image.
*/
public ComponentHighlighter(JComponent aComponent, URL aURL) {
if (aURL == null)
return;
init(aComponent, Toolkit.getDefaultToolkit().getImage(aURL));
}
/**
* "Fire-and-forget" constructor.
*
* @param aComponent A Component that will be highlighted.
* @param anImage An image, preferably an animated GIF with transparency,
* that will slide along the length of the component.
*/
public ComponentHighlighter(JComponent aComponent, Image anImage) {
init(aComponent, anImage);
}
protected void init(JComponent aComponent, Image anImage) {
if ((aComponent == null) || (anImage == null))
return;
component = aComponent;
rootPane = SwingUtilities.getRootPane(component);
oldGlassPane = rootPane.getGlassPane();
glassPane = new JPanel();
rootPane.setGlassPane(glassPane);
glassPane.setVisible(true);
glassPane.setOpaque(false);
glassPane.setLayout(null);
ImageIcon icon = new ImageIcon(anImage);
imageLabel = new JLabel();
imageLabel.setIconTextGap(0);
imageLabel.setIcon(icon);
imageLabel.setSize(icon.getIconWidth(), icon.getIconHeight());
glassPane.add(imageLabel);
Rectangle bounds = component.getBounds();
if (component.getParent() instanceof Component) {
bounds = SwingUtilities.convertRectangle((Container) component.getParent(), bounds,
rootPane.getContentPane());
}
imageLabel.setLocation(bounds.x, bounds.y + bounds.height - imageLabel.getBounds().height);
glassPane.revalidate();
glassPane.repaint();
component.transferFocus(); // halts a caret, if necessary
timer = new Timer(80, this);
timer.setRepeats(true);
timer.start();
}
public void actionPerformed(ActionEvent evt) {
Rectangle bounds = imageLabel.getBounds();
Rectangle target = component.getBounds();
if (component.getParent() instanceof Component) {
target = SwingUtilities.convertRectangle((Container) component.getParent(), target,
rootPane.getContentPane());
}
if (bounds.x + bounds.width > target.x + target.width) { // clean up and end
timer.stop();
rootPane.setGlassPane(oldGlassPane);
component.requestFocus();
return;
}
// else, slide to the right and continue
imageLabel.setLocation(bounds.x + Math.max(bounds.width / 12, 1), bounds.y);
imageLabel.repaint();
}
}
/*
* $Log$ Revision 1.2 2006/02/18 23:19:05 cgruber Update imports and maven
* dependencies.
*
* Revision 1.1 2006/02/16 13:22:22 cgruber Check in all sources in
* eclipse-friendly maven-enabled packages.
*
* Revision 1.1.1.1 2000/12/21 15:51:18 mpowers Contributing wotonomy.
*
* Revision 1.2 2000/12/20 16:25:45 michael Added log to all files.
*
*
*/
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