controller.java

应用MVC编写的Java应用程序实例

/**
 * @author 罗求忠　@edu.buaa.etei
 *　2007-9-18　下午07:32:50
 */
package edu.buaa.basic.test.mvc.controller;

import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;

import edu.buaa.basic.test.mvc.model.AbstractModel;
import edu.buaa.basic.test.mvc.model.SphereModel;
import edu.buaa.basic.test.mvc.view.AbstractView;
import edu.buaa.basic.test.mvc.view.ButtonView;
import edu.buaa.basic.test.mvc.view.TextFieldView;

/**
 * Controller类主要负责新建Model与View，将view与Model相关联，并处理事件
 */
public class Controller extends JFrame implements ActionListener {

	AbstractModel sphereModel;
	AbstractView textFieldView;
	AbstractView buttonView;

	public Controller() {
		setTitle("Spheres: volume and surface area");	
		setSize(430, 330);
		
		// 追建模型SphereModel的实例
		sphereModel = new SphereModel(5);

		// 追建视图TextFieldView的实例
		textFieldView = new TextFieldView();
		textFieldView.addActionListener(this);	
		// 将视图TextFieldView的实例添加为模型SphereModel的实例的Observer
		sphereModel.addObserver(textFieldView);
		// 更新视图
		textFieldView.update(sphereModel, null);
		add(textFieldView);

		// 追建视图ButtonView的实例
		buttonView = new ButtonView();
		buttonView.addActionListener(this);	
		// 将视图ButtonView的实例添加为模型SphereModel的实例的Observer
		sphereModel.addObserver(buttonView);
		// 更新视图
		buttonView.update(sphereModel, null);
		add(buttonView);
		
		setDefaultCloseOperation(EXIT_ON_CLOSE);
	}

	public void actionPerformed(ActionEvent ae) {
		if (ae.getSource() instanceof JTextField) {
			JTextField tf = (JTextField)ae.getSource();    
			double radius = Double.parseDouble(tf.getText());
			sphereModel.setRadius(radius);
		} else if (ae.getSource() instanceof JButton) {
			sphereModel.setRadius(5);
		}
	}
}