menubar.java

采用基础Java语言实现的一个类似于Windows中的画图程序。

/*
 * menubar.java
 *
 * Created on 2007年6月24日, 上午9:22
 *
 * To change this template, choose Tools | Template Manager
 * and open the template in the editor.
 */

package huaban;

import java.awt.Panel;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.Vector;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;


/**
 *
 * @author Administrator
 */
public class menubar extends JMenuBar implements ActionListener{
    
    JMenuItem Item[] = new JMenuItem[5];
    JMenu  menu[] = new JMenu[3];
    JButton[] button = new JButton[3];
    JCheckBox box;
    Drawpanel pan;
    String st = null;
    public menubar(Drawpanel pan) {
        this.pan = pan;
        String st[] = {"文件","编辑","查看"};
        String str[] = {"保存","打开","新建","撤销","显示颜色"};
        for(int i = 0; i < 5; i++){
            Item[i] = new JMenuItem(str[i]);
        }
        for(int j = 0; j < 3; j++){            
            menu[j] = new JMenu(st[j]);
        }
        for(int i = 0; i < 3; i++){
            button[i] = new JButton();
            button[i].add(menu[i]);
        }
        box = new JCheckBox(str[4],false);
        Item[4].add(box);
        menu[0].add(Item[0]);
        menu[0].add(Item[1]);
        menu[0].add(Item[2]);
        menu[1].add(Item[3]);
        menu[2].add(Item[4]);
        
        this.add(menu[0]);
        this.add(menu[1]);
        this.add(menu[2]);
        
        Item[0].addActionListener(this);
        Item[1].addActionListener(this);
        Item[2].addActionListener(this);
        Item[3].addActionListener(this);
        Item[4].addActionListener(this);
        box.addActionListener(this);
        this.setRequestFocusEnabled(true);
    }
    
    public void actionPerformed(ActionEvent e){
        if(e.getSource() == Item[0]){
            try{
                if(st == null){
                    st = JOptionPane.showInputDialog(this,"输入存储文件名");
                }
                File file = new File(st);  
                FileOutputStream output = new FileOutputStream(file);
                ObjectOutputStream objectout  = new ObjectOutputStream(output);
                objectout.writeObject(pan.panel1.vector);
            }
            catch(IOException h){
                System.out.println(h);
                
            }
            
        }
        if(e.getSource() == Item[1]){
            try{
                st = JOptionPane.showInputDialog(this,"输文件名");
                File file = new File(st);
                FileInputStream input = new FileInputStream(file);
                ObjectInputStream objectin = new ObjectInputStream(input);
                pan.panel1.vector.removeAllElements();
                pan.panel1.vector = (Vector)objectin.readObject();
                pan.panel1.repaint();
            } 
            
            catch(Exception h){
                System.out.println("Error" + e);
                System.exit(1);
            }
            
        }
        
        if(e.getSource() == Item[2]){
            pan.panel1.pressed = true;
            pan.panel1.vector.removeAllElements();
            pan.panel1.repaint();
            st = null;
        }
        if(e.getSource() == Item[3]){
            pan.panel1.pressed = true;
            if(pan.panel1.vector.size() > 0){
                pan.panel1.vector.removeElementAt(pan.panel1.vector.size()-1);
                pan.panel1.repaint();
            }
        }
        if(e.getSource() == box){
            if(box.isSelected()){
                pan.panel.setVisible(true);
            }
            else{
                pan.panel.setVisible(false);
            }
        }        
    }
    
}