dbmenu.java

来自「java数据库编程源码」· Java 代码 · 共 40 行

package JavaDatabaseBible.part2;

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

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);
		}
	}
}