java - actionlistener回调到另一个类

我有一个LabelTextField类，它按照其指示进行操作，它创建了一个标签，后跟文本字段。我希望此类像JTextField那样起作用，即在添加操作侦听器时响应actionPerformed。我使用LabelTextField添加了一个动作侦听器，因此此类中的JTextField将需要接收回调并转发LabelTextField对象名而不是JTextField对象名。

我已经展示了一个简单的JTextField及其工作方式，LabelTextField也在那里以及我希望如何使用它。

我提供了我想做的代码片段。

我在使用此类回调时遇到麻烦，详细信息将很有用。

//

class C_one extends JPanel
{

       private JTextField      mjtfOne;
       private LabelTextField  m_nameFind;

       public C_one ()
       {
          setLayout(new FlowLayout());

          mjtfOne = new JTextField(20);
          mjtfOne.addActionListener(this);

          m_nameFind = new LabelTextField("Name", 20);
          m_nameFind.addActionListener(this);

          add(mjtfOne);
          add(m_nameFind);

       }

       // This is called when return is pressed in either object.
       public void actionPerformed(ActionEvent ae)
       {
          // This works.
          if (ae.getSource() == mjbnOne) {
             System.out.println("Text field one!");

          // ****** This doesn't work. *****
          } else if (ae.getSource() == m_nameFind) {
             System.out.println("Label Text Field name");
          }
       }

}

//
//这将创建标签和文本字段作为小部件。
LabelTextField类扩展了JPanel
{

   private  JTextField     mjtf;
   private ActionListener  mal;


   public LabelTextField(String label, int textfieldWidth)
   {
      setLayout(new FlowLayout());

      JLabel lbl = new JLabel(label);
      add(lbl);

      mjtf = new JTextField(textfieldWidth);
      add(mjtf);
   }

   // The caller of this class will call this as he would for
   // JTextField.
   public void addActionListener(ActionListener al)
   {
      mjtf.addActionListener(this);
      mal = al;
   }

   // This will receive the return from JTextField and needs
   // to forward this on to calling class with caller object
   // not mjtf.
   //
   // Problem: I can not figure out how to save caller object
   // name so when this is called I can forward it on just like
   // what JTextField would have done, ie caller can use
   // ae.getSource() == m_nameFind.
   public void actionPerformed(ActionEvent ae)
   {
      mal.actionPerformed(ae); // This does call the caller.
   }

}

最佳答案

ae.getSource()的值将为mjtf，因为这是生成原始ActionEvent的组件。
如果要将事件的来源设为m_nameFind，即您的自定义LabelTextField对象，则需要手动进行设置：

  public void actionPerformed(ActionEvent ae)
  {
    ae.source=this; // this makes it look like the LabelTextField generated the event
    mal.actionPerformed(ae);
  }

这就是你想做的吗？

-

编辑

感谢@Madprogrammer ..也许您应该像这样重新创建ActionEvent

  public void actionPerformed(ActionEvent ae)
  {
      mal.actionPerformed(new ActionEvent(this, ae.getID(),
         ae.getCommand(), ae.getWhen(), ae.getModifiers() ));
  }