dbmenu.java

来自「用java编写的数据库管理程序」· Java 代码 · 共 37 行

package createdb;

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

public class DBMenu extends JMenu{
  JMenuItem dbItem;
  JMenuItem newItem;
  JMenuItem openItem;
  JMenuItem exitItem;

  ActionListener menuListener = null;
  MenuItemListener itemListener = new MenuItemListener();

  public DBMenu(){
  }
  public void enableMenuItem(String itemName,boolean enable){
    Component c[] = getMenuComponents();
    for(int i=0;i<c.length;i++){
      if(c[i] instanceof JMenuItem){
        JMenuItem menuItem = (JMenuItem)c[i];
        if(menuItem.getText().equals(itemName))menuItem.setEnabled(enable);
      }
    }
  }
  public void setMenuListener(ActionListener menuListener){
    this.menuListener = menuListener;
  }
                class MenuItemListener implements ActionListener{
                        public void actionPerformed(ActionEvent event){
                                String action = event.getActionCommand();
                          if(menuListener!=null)menuListener.actionPerformed(event);
                        }
                }
}