memdraw.java

源码为科学出版社出版的英文<java设计模式>(影印版)所用的所有例子程序

import java.awt.*;
import java.awt.event.*;
import java.util.*;

//swing classes
import javax.swing.text.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.border.*;
import javax.swing.tree.*;


public class MemDraw extends JxFrame
implements ActionListener {
    JToolBar tbar;
    Mediator med;
//-------------------------------------------
    public MemDraw() {
        super("Memento Drawing");
        JPanel jp = new JPanel();
        getContentPane().add(jp);
        med = new Mediator();

        jp.setLayout(new BorderLayout());
        tbar = new JToolBar();
        jp.add("North", tbar);
        RectButton rect = new RectButton(this, med);
        tbar.add(rect);
        UndoButton undo = new UndoButton(this, med);
        tbar.add(undo);
        tbar.addSeparator();
        ClearButton clr = new ClearButton(this, med);
        tbar.add(clr);

        JCanvas canvas = new JCanvas(med);
        jp.add("Center", canvas);

        MouseApp map = new MouseApp(med);
        canvas.addMouseListener(map);
        MouseMoveApp mvap = new MouseMoveApp(med);
        canvas.addMouseMotionListener(mvap);
        setSize(new Dimension(400,300));
        setVisible(true);

    }

    //-------------------------------------------
    public void actionPerformed(ActionEvent e) {
        Command comd = (Command)e.getSource();
        comd.Execute();
    }
    //-------------------------------------------
    static public void main(String[] argv) {
        new MemDraw();
    }
}
//==============================
class MouseApp extends MouseAdapter {
    Mediator med;
    public MouseApp(Mediator md) {
        super();
        med = md;
    }
    public void mousePressed(MouseEvent e) {
        med.createRect(e.getX(), e.getY());
    }
    public void mouseReleased(MouseEvent e) {
        med.rememberPosition();
    }
}
//-------------------------------------------
class MouseMoveApp extends MouseMotionAdapter {
    Mediator med;
    public MouseMoveApp(Mediator md) {
        super();
        med = md;
    }
    public void mouseDragged(MouseEvent e) {
        med.drag(e.getX(), e.getY());
    }
}