hoverhelp.java

一个用于排队系统仿真的开源软件,有非常形象的图象仿真过程!

/**    
  * Copyright (C) 2006, Laboratorio di Valutazione delle Prestazioni - Politecnico di Milano

  * 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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  */
  
package jmt.gui.help;

import javax.swing.*;
import java.awt.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.util.HashMap;
import java.util.Map;
import java.util.Stack;

/**

 * @author alyf (Andrea Conti)
 * Date: 17-set-2003
 * Time: 3.24.59

 */

/**
 * a very basic help system - you register (Component,String) couples and when the mouse enters the component the String is displayed in a JLabel.
 */
public class HoverHelp extends MouseAdapter {

	protected JLabel statusField;
	protected Map map;
	protected Stack s;


	public HoverHelp() {
		statusField = new JLabel();
		statusField.setText("");
		map = new HashMap();
		s = new Stack();
		addHelp(statusField, "This area displays a short help about the objects you move the cursor on");
	}

	public void addHelp(Component comp, String help) {
		if (help == null) return;
		Object v = map.put(comp, help);
		if (v == null) comp.addMouseListener(this);
	}

	public void removeHelp(Component comp) {
		Object v = map.remove(comp);
		if (v != null) comp.removeMouseListener(this);
	}

	public void mouseEntered(MouseEvent e) {
		s.push(statusField.getText());
		statusField.setText((String) map.get(e.getSource()));
	}

	public void mouseExited(MouseEvent e) {
		if (!s.empty()) statusField.setText((String) s.pop());
	}

	public JLabel getHelpLabel() {
		return statusField;
	}

}