ColorSwatch.java

/*
 * @(#)ColorSwatch.java
 *
 * $Date: 2011-02-24 00:42:26 -0600 (Thu, 24 Feb 2011) $
 *
 * Copyright (c) 2011 by Jeremy Wood.
 * All rights reserved.
 *
 * The copyright of this software is owned by Jeremy Wood. 
 * You may not use, copy or modify this software, except in  
 * accordance with the license agreement you entered into with  
 * Jeremy Wood. For details see accompanying license terms.
 * 
 * This software is probably, but not necessarily, discussed here:
 * http://javagraphics.java.net/
 * 
 * That site should also contain the most recent official version
 * of this software.  (See the SVN repository for more details.)
 */
package colorpicker.swing;

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.TexturePaint;
import java.awt.Toolkit;
import java.awt.datatransfer.Transferable;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.image.BufferedImage;

import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.JPopupMenu;

import colorpicker.plaf.PlafPaintUtils;


/** This is a square, opaque panel used to indicate
 * a certain color.
 * <P>The color is assigned with the <code>setForeground()</code> method.
 * <P>Also the user can right-click this panel and select 'Copy' to send
 * a 100x100 image of this color to the clipboard.  (This feature was
 * added at the request of a friend who paints; she wanted to select a
 * color and then quickly print it off, and then mix her paints to match
 * that shade.)
 * 
 */
public class ColorSwatch extends JPanel {
	private static final long serialVersionUID = 1L;
	
	
	JPopupMenu menu;
	JMenuItem copyItem;
	MouseListener mouseListener = new MouseAdapter() {
		public void mousePressed(MouseEvent e) {
			if(e.isPopupTrigger()) {
				if(menu==null) {
					menu = new JPopupMenu();
					copyItem = new JMenuItem(ColorPicker.strings.getObject("Copy").toString());
					menu.add(copyItem);
					copyItem.addActionListener(actionListener);
				}
				menu.show(ColorSwatch.this,e.getX(),e.getY());
			}
		}
	};
	ActionListener actionListener = new ActionListener() {
		public void actionPerformed(ActionEvent e) {
			Object src = e.getSource();
			if(src==copyItem) {
				BufferedImage image = new BufferedImage(100,100,BufferedImage.TYPE_INT_RGB);
				Graphics2D g = image.createGraphics();
				g.setColor(getBackground());
				g.fillRect(0, 0, image.getWidth(), image.getHeight());
				g.dispose();
				Transferable contents = new ImageTransferable(image);
				Toolkit.getDefaultToolkit().getSystemClipboard().setContents(contents, null);
			}
		}
	};
	int w;
	
	public ColorSwatch(int width) {
		w = width;
		setPreferredSize(new Dimension(width,width));
		setMinimumSize(new Dimension(width,width));
		addMouseListener(mouseListener);
	}
	
	public ColorSwatch(Color color,int width) {
		this(width);
		setForeground(color);
	}
	
	private static TexturePaint checkerPaint = null;
	private static TexturePaint getCheckerPaint() {
		if(checkerPaint==null) {
			int t = 8;
			BufferedImage bi = new BufferedImage(t*2,t*2,BufferedImage.TYPE_INT_RGB);
			Graphics g = bi.createGraphics();
			g.setColor(Color.white);
			g.fillRect(0,0,2*t,2*t);
			g.setColor(Color.lightGray);
			g.fillRect(0,0,t,t);
			g.fillRect(t,t,t,t);
			checkerPaint = new TexturePaint(bi,new Rectangle(0,0,bi.getWidth(),bi.getHeight()));
		}
		return checkerPaint;
	}
	
	public void paint(Graphics g0) {
		super.paint(g0); //may be necessary for some look-and-feels?
		
		Graphics2D g = (Graphics2D)g0;
		
		Color c = getForeground();
		int w2 = Math.min(getWidth(), w);
		int h2 = Math.min(getHeight(), w);
		Rectangle r = new Rectangle(getWidth()/2-w2/2,getHeight()/2-h2/2, w2, h2);
		
		if(c.getAlpha()<255) {
			TexturePaint checkers = getCheckerPaint();
			g.setPaint(checkers);
			g.fillRect(r.x, r.y, r.width, r.height);
		}
		g.setColor(c);
		g.fillRect(r.x, r.y, r.width, r.height);
		PlafPaintUtils.drawBevel(g, r);
	}
}