確定MouseListener中單擊的JPanel組件。事件處理

Question

我有一個類whitch擴展JPanel：

public class ButtonPanel extends JPanel { 

    private label; 

    public ButtonPanel() { 
     label=new JLabel("waiting for click"); 
     add(label); 
    } 

    public void setButtonText() { 
     label.setText("just clicked"); 
    } 

} 

我有被添加到JFrame的那類的幾個實例。我想創建一個MouseAdapter類的實例，然後將它們作爲鼠標監聽器添加到我的JFrame上的所有ButtonPanel組件。我想：

ButtonPanel butt1 = new ButtonPanel(); 
ButtonPanel butt2 = new ButtonPanel(); 
ButtonPanel butt3 = new ButtonPanel(); 
//... here goes code which add ButtonPanels to JFrame 

MouseAdapterMod mam = new MouseAdapterMod(); 
butt1.addMouseListener(mam); 
butt2.addMouseListener(mam); 
butt3.addMouseListener(mam); 

MouseAdapterMod類我想與另一個分開，並找到它自己的包中。它應該是這樣的：

public class MouseAdapterMod extends MouseAdapter { 

    public void mouseClicked(MouseEvent e) { 
     //here goes the code of calling setButtonText method of ButtonPanel component on which the event had occurred 
    } 
} 

所以問題是，我不知道如何實現的mouseClicked方法，使其確定ButtonPanel生成事件，並調用相應於該部件setButtonText（）方法。有誰知道該怎麼做？

我知道我可以通過在ButtonPanel類中包含事件處理功能來實現此目的，但這對我來說不是合適的方式，因爲我想保留上面描述的類結構，並且只有一個MouseAdapterMod類的實例處理所有的ButtonPanel。

Answer 1

的MouseEvent#getSource方法將返回對象已被點擊其中：

public class MouseAdapterMod extends MouseAdapter { 

    // usually better off with mousePressed rather than clicked 
    public void mousePressed(MouseEvent e) { 
     ButtonPanel btnPanel = (ButtonPanel)e.getSource(); 
     btnPanel.setButtonText(); 
    } 
} 

正如註釋筆記，你通常能夠更好地傾聽或的mousePressed的mouseReleased，而不是因爲的mouseClicked爲的mouseClicked工作，新聞發佈必須來自同一點，如果鼠標移動的數量很少，則點擊將不會註冊。

我的測試程序：

import java.awt.Color; 
import java.awt.GridLayout; 
import java.awt.event.*; 

import javax.swing.*; 

public class MainForButtonPanel extends JPanel { 
    public MainForButtonPanel() { 
     setLayout(new GridLayout(4, 4)); 

     MouseAdapter myMA = new MouseAdapterMod(); 

     for (int i = 0; i < 4; i++) { 
     for (int j = 0; j < 4; j++) { 
      ButtonPanel btnPanel = new ButtonPanel(); 
      btnPanel.addMouseListener(myMA); 
      add(btnPanel); 
     } 
     } 

    } 

    private static void createAndShowUI() { 
     JFrame frame = new JFrame("MainForButtonPanel"); 
     frame.getContentPane().add(new MainForButtonPanel()); 
     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     frame.pack(); 
     frame.setLocationRelativeTo(null); 
     frame.setVisible(true); 
    } 

    public static void main(String[] args) { 
     java.awt.EventQueue.invokeLater(new Runnable() { 
     public void run() { 
      createAndShowUI(); 
     } 
     }); 
    } 
} 

class ButtonPanel extends JPanel { 

    private static final int TIMER_DELAY = 2000; 
    private static final String JUST_CLICKED = "just clicked"; 
    private static final String WAITING_FOR_CLICK = "waiting for click"; 
    private static final Color CLICKED_COLOR = Color.pink; 
    private JLabel label; 

    public ButtonPanel() { 
     label = new JLabel(WAITING_FOR_CLICK); 
     add(label); 
    } 

    public void setButtonText() { 
     label.setText(JUST_CLICKED); 
     setBackground(CLICKED_COLOR); 

     new Timer(TIMER_DELAY, new ActionListener() { 
     public void actionPerformed(ActionEvent ae) { 
      label.setText(WAITING_FOR_CLICK); 
      setBackground(null); 
      ((Timer)ae.getSource()).stop(); 
     } 
     }).start(); 
    } 

} 

class MouseAdapterMod extends MouseAdapter { 

    // usually better off with mousePressed rather than clicked 
    public void mousePressed(MouseEvent e) { 
     ButtonPanel btnPanel = (ButtonPanel)e.getSource(); 
     btnPanel.setButtonText(); 
    } 
}