GradientJLabel.java

//
//  @(#)GradientJLabel.java		10/2003
//
//  Copyright 2003 Zachary DelProposto. All rights reserved.
//  Use is subject to license terms.
//
//
//  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., 675 Mass Ave, Cambridge, MA 02139, USA.
//  Or from http://www.gnu.org/
//
package dip.gui.swing;

import java.awt.*;
import javax.swing.*;

/** 
*	A gradient-shaded background JLabel. It is 
*	drawn inside a JPanel because it's easier to
*	adjust the rendering that way.
*/
public class GradientJLabel extends JPanel
{
	final JLabel label;
	
	/** Create a GradientJLabel */
	public GradientJLabel(String text)
	{
		this(text, SwingConstants.LEFT);
	}// GradientJLabel()

	/** Create a GradientXJEditorPane */
	public GradientJLabel(String text, int horizontalAlignment)
	{
		super(new FlowLayout(FlowLayout.LEFT, 0, 3));
		label = new JLabel(text, horizontalAlignment)
		{
			public boolean isOpaque()	{ return false; }
			public boolean isFocusable()	{ return false; }
		};
		setOpaque(false);
		label.setOpaque(false);
		
		add(Box.createHorizontalStrut(5));	// should adjust to font .. perhaps width of "N"?
		add(label);
	}// GradientJLabel()
	
	
	/** Overrides setText() */
	public void setText(String text)
	{
		label.setText(text);
	}// setText()
	
	
	/** We are not opaque; we will paint the background. */
	public boolean isOpaque()	{ return false; }
	
	/** We are not focusable. */
	public boolean isFocusable()	{ return false; }
	
	/** Overridden to provide painting functionality. */
	protected void paintComponent(Graphics g)
	{
		final int width = getWidth();
		final int height = getHeight();
		
		Graphics2D g2d = (Graphics2D) g;
		
		// save old paint.
		Paint oldPaint = g2d.getPaint();
		
		// paint the gradient.
		g2d.setPaint(new GradientPaint(0, 0, 
			UIManager.getColor("TextField.highlight"), 
			width, height, 
			UIManager.getColor("Label.background"), false));
		g2d.fillRect(0, 0, width, height);
		
		// restore the original paint
		g2d.setPaint(oldPaint);
		
		// paint foreground
		super.paintComponent(g);
	}// paintComponent()
	
}// nested class GradientJLabel