Custom EventListener類

Question

我已經提供了一些部分編寫的類，它們一起編輯mp3 id3v1文件的信息標記。所有信息都通過GUI顯示。

我在這裏感興趣的是DisplayTagPanel。我如何使用

public void addTagPanelEventListener(TagPanelEventListener tagPanelEvent) { 
} 

要從編輯按鈕觸發事件？ 這裏是使用addTagPanelEventListener的類以及它實現的接口TagPanelEventListener。

/** 
* This Panel will display the ID3 tag information for read only 
* This class should: 
* - Configure the textfields for read only 
* - Configure the action buttons (Edit) 
* - Handle actions on Edit button 
* - Fire notifications to listeners on edit button 
*/ 
@SuppressWarnings("serial") 
public class DisplayTagPanel extends AbstractTagPanel { 

public DisplayTagPanel(ID3v1 id3v1Tag) { 
    super(id3v1Tag); 
    validate(); 
} 

@Override 
protected void configureActionFields() { 
    JButton edit = new JButton("Edit"); 
    JPanel editOptionsPanel = new JPanel(new FlowLayout()); 
    editOptionsPanel.add(edit); 

    this.add(editOptionsPanel, BorderLayout.PAGE_END); 
} 

public void addTagPanelEventListener(TagPanelEventListener tagPanelEvent) { 
} 

@Override 
protected void configureFields() { 
// TODO Auto-generated method stub 

} 
} 

---

package edu.pitt.cs401.assignment4; 

import org.farng.mp3.id3.ID3v1; 

/** 
* Define events that are triggered by action on Tag Panels 
* 
*/ 
public interface TagPanelEventListener { 

/** 
* The edit action 
* @param id3v1 The ID3v1 tag that was loaded from the file is passed as argument 
*/ 
public void onEdit(ID3v1 id3v1); 

/** 
* Called when the save button is pressed 
* @param id3v1Edit This is the edited ID3v1 tag. 
*/ 
public void onSave(ID3v1 id3v1Edit); 

/** 
* Called when the cancel button is pressed 
*/ 
public void onCancel(); 
} 

Answer 1

您需要修改DisplayTagPanel類作爲波紋管

@SuppressWarnings("serial") 
public class DisplayTagPanel extends AbstractTagPanel { 
private TagPanelEventListener tagPanelListener = null; 
public DisplayTagPanel(ID3v1 id3v1Tag) { 
    super(id3v1Tag); 
    validate(); 
    tagPanelListener = new TagPanelListenerImpl(); //create class TagPanelListenerImpl which implements TagPanelListener 
} 

@Override 
protected void configureActionFields() { 
    JButton edit = new JButton("Edit"); 
    //Write an action Listener class, which inplements TagPanelListener interface 
    //and in its actionPerformed method call edit methot of your implementation 
    edit.addActionListener(this.tagPanelListener); 
    JPanel editOptionsPanel = new JPanel(new FlowLayout()); 
    editOptionsPanel.add(edit); 

    this.add(editOptionsPanel, BorderLayout.PAGE_END); 
} 

public void addTagPanelEventListener(TagPanelEventListener tagPanelEvent) 
{ 
    this.tagPanelListener = tagPanelEvent; //This is your listener 
} 

@Override 
protected void configureFields() { 
// TODO Auto-generated method stub 

} 


}