CMenuItem.java

// -*- mode: java; c-basic-offset: 2; -*-
// Copyright 2009-2011 Google, All Rights reserved
// Copyright 2011-2012 MIT, All rights reserved
// Released under the MIT License https://raw.github.com/mit-cml/app-inventor/master/mitlicense.txt
package openblocks.codeblockutil;

import java.awt.Color;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.geom.Rectangle2D;

import javax.swing.JButton;

public class CMenuItem extends JButton implements MouseListener{
	private static final long serialVersionUID = 328149080429L;
	public enum Position{CENTER, LEFT};
	private Color background = CGraphite.darkgreen;
	private Color highlight = CGraphite.white;
	private boolean focus = false;
	Position textPosition;
	public CMenuItem(String text){
		this(text, Position.LEFT);
	}
	public CMenuItem(String text, Position position){
		super();
		super.setText(text);
		super.setOpaque(false);
		this.addMouseListener(this);
		textPosition = position;
	}
	public void paint(Graphics g){
		Graphics2D g2 = (Graphics2D)g;
		if(focus){
			g2.setColor(background);
		}else{
			g.setColor(highlight);
		}
		g2.fillRect(0,0,this.getWidth(), this.getHeight());
		String text = this.getText();
		if(text != null){
			Font font = g2.getFont().deriveFont((float)(((float)this.getHeight()) * .8));
			g2.setFont(font);

            FontMetrics metrics = g2.getFontMetrics();
            Rectangle2D textBounds = metrics.getStringBounds(this.getText(),g2);
            double textHeight = textBounds.getHeight();
            double textWidth = textBounds.getWidth() > this.getWidth() ? this.getWidth()/2 : textBounds.getWidth();
            float y = (float)((this.getHeight() / 2) + (textHeight / 2)) - metrics.getDescent();
            float x;
            if(textPosition == Position.LEFT){
            	x = 10;
            }else{
            	x = (float)((this.getWidth() / 2) - (textWidth / 2));
            }
            
			g2.setColor(Color.black);
			g2.drawString(text, x, y);
		}
	}
	public void mouseEntered(MouseEvent e) {
		this.focus = true;
		this.repaint();
	}
	public void mouseExited(MouseEvent e) {
		this.focus = false;
		this.repaint();
	}
	public void mousePressed(MouseEvent e) {}
	public void mouseReleased(MouseEvent e) {}
	public void mouseClicked(MouseEvent e) {}
}