main.java

<设计模式-Java语言中的应用> 的源码

import command.*;
import drawer.*;

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

public class Main extends JFrame implements ActionListener, MouseMotionListener, WindowListener {
    // 绘制记录
    private MacroCommand history = new MacroCommand();
    // 绘制区域
    private DrawCanvas canvas = new DrawCanvas(400, 400, history);
    // 刪除键
    private JButton clearButton  = new JButton("clear");
    // 恢复键
    private JButton undoButton  = new JButton("undo");      

    // 构造子
    public Main(String title) {
        super(title);

        this.addWindowListener(this);
        canvas.addMouseMotionListener(this);
        clearButton.addActionListener(this);
        undoButton.addActionListener(this);         

        Box buttonBox = new Box(BoxLayout.X_AXIS);
        buttonBox.add(clearButton);
        buttonBox.add(undoButton);                  
        Box mainBox = new Box(BoxLayout.Y_AXIS);
        mainBox.add(buttonBox);
        mainBox.add(canvas);
        getContentPane().add(mainBox);

        pack();
        setVisible(true);
    }

    // ActionListener用
    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == clearButton) {
            history.clear();
            canvas.repaint();
        } else if (e.getSource() == undoButton) {       
            history.undo();                             
            canvas.repaint();                           
        }
    }

    // MouseMotionListener用
    public void mouseMoved(MouseEvent e) {
    }
    public void mouseDragged(MouseEvent e) {
        Command cmd = new DrawCommand(canvas, e.getPoint());
        history.append(cmd);
        cmd.execute();
    }

    // WindowListener用
    public void windowClosing(WindowEvent e) {
        System.exit(0);
    }
    public void windowActivated(WindowEvent e) {}
    public void windowClosed(WindowEvent e) {}
    public void windowDeactivated(WindowEvent e) {}
    public void windowDeiconified(WindowEvent e) {}
    public void windowIconified(WindowEvent e) {}
    public void windowOpened(WindowEvent e) {}

    public static void main(String[] args) {
        new Main("Command Pattern Sample");
    }
}