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");
    // 紅色键
    private JButton redButton  = new JButton("red");        
    // 綠色键
    private JButton greenButton  = new JButton("green");    
    // 藍色键
    private JButton blueButton  = new JButton("blue");      

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

        this.addWindowListener(this);
        canvas.addMouseMotionListener(this);
        clearButton.addActionListener(this);
        redButton.addActionListener(this);      
        greenButton.addActionListener(this);    
        blueButton.addActionListener(this);     

        Box buttonBox = new Box(BoxLayout.X_AXIS);
        buttonBox.add(clearButton);
        buttonBox.add(redButton);   
        buttonBox.add(greenButton); 
        buttonBox.add(blueButton);  
        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.init();                                      
            canvas.repaint();
        } else if (e.getSource() == redButton) {                
            Command cmd = new ColorCommand(canvas, Color.red);  
            history.append(cmd);                                
            cmd.execute();                                      
        } else if (e.getSource() == greenButton) {              
            Command cmd = new ColorCommand(canvas, Color.green);
            history.append(cmd);                                
            cmd.execute();                                      
        } else if (e.getSource() == blueButton) {               
            Command cmd = new ColorCommand(canvas, Color.blue); 
            history.append(cmd);                                
            cmd.execute();                                      
        }
    }

    // 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");
    }
}