如何突出顯示鼠標懸停時的JPanel？

我有16個Jpanels，當我將鼠標懸停在他們上面時，我想突出顯示。我創建了匿名的JPanel，然後將它們添加到父項，併爲它們中的每一個添加了一個MouseListener。然後我添加了一個MouseListener給父級。事情是，現在它突出了父母。我怎樣才能解決這個問題？如何突出顯示鼠標懸停時的JPanel？

注意：有時JFrame不顯示任何東西 - 你只需要繼續運行它，直到它（通常需要2-3次嘗試）。評論> 5次嘗試後它是否還沒有工作。

HighlightJPanels（創建的JFrame，容器，和孩子，並且將所MouseListeners）

public class HighlightJPanels extends JFrame{ 
    private static final long serialVersionUID = 7163215339973706671L; 
    private static final Dimension containerSize = new Dimension(640, 477); 
    private JLayeredPane layeredPane; 
    static JPanel container; 

    public HighlightJPanels() { 
     super("Highlight Test"); 
     setSize(640, 477); 
     setLocationRelativeTo(null); 
     setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     setResizable(false); 
     setVisible(true); 

     layeredPane = new JLayeredPane(); 
     layeredPane.setPreferredSize(containerSize); 
     getContentPane().add(layeredPane); 

     createContainer(); 

     layeredPane.add(container, JLayeredPane.DEFAULT_LAYER); 

     createChildren(4, 4); 

     container.addMouseMotionListener(new HighlightJPanelsContainerMouseListener()); 
    } 

    private void createChildren(int columns, int rows){ 
     for (int i = 0; i < columns; i++){ 
      for (int j = 0; j < rows; j++){ 
       JPanel child = new JPanel(new BorderLayout()); 
       child.setBackground(Color.LIGHT_GRAY); 
       child.addMouseListener(new HighlightJPanelsMouseListeners()); 
       container.add(child); 
      } 
     } 
    } 

    private JPanel createContainer(){ 
     container = new JPanel(); 
     container.setLayout(createLayout(4, 4, 1, 1)); 
     container.setPreferredSize(containerSize); 
     container.setBounds(0, 0, containerSize.width, containerSize.height); 
     return container; 
    } 

    private GridLayout createLayout(int rows, int columns, int hGap, int vGap){ 
     GridLayout layout = new GridLayout(rows, columns); 
     layout.setHgap(hGap); 
     layout.setVgap(vGap); 
     return layout; 
    } 

    public static void main(String[] args) { 
     new HighlightJPanels(); 
    } 
}

HighlightJPanelsChildMouseListeners（創建將被添加到所述兒童MouseListeners）

public class HighlightJPanelsChildMouseListeners implements MouseListener{ 
    private Border grayBorder = BorderFactory.createLineBorder(Color.DARK_GRAY); 

    public HighlightJPanelsChildMouseListeners() { 
    } 

    public void mouseEntered(MouseEvent e) { 
     Component comp = HighlightJPanels.container.findComponentAt(HighlightJPanelsContainerMouseListener.eX, HighlightJPanelsContainerMouseListener.eY); 
     JPanel parent = (JPanel) comp; 
     parent.setBorder(grayBorder); 
     parent.revalidate(); 
    } 

    public void mouseExited(MouseEvent e) { 
     Component comp = HighlightJPanels.container.findComponentAt(HighlightJPanelsContainerMouseListener.eX, HighlightJPanelsContainerMouseListener.eY); 
     JPanel parent = (JPanel) comp; 
     parent.setBorder(null); 
     parent.revalidate(); 
    } 

    public void mousePressed(MouseEvent e){} 
    public void mouseReleased(MouseEvent e){} 
    public void mouseClicked(MouseEvent e) {} 
}

HighlightJPanelsContainerMouseListener（創建MouseListener將加入到容器）

public class HighlightJPanelsContainerMouseListener implements MouseMotionListener{ 
    static int eX; 
    static int eY; 

    public void mouseDragged(MouseEvent e) {} 

    public void mouseMoved(MouseEvent e) { 
     eX = e.getX(); 
     eY = e.getY(); 
    } 
}

來源

2016-11-23 Alex Quilliam

我建議在MouseMotionListener上使用MouseListener並實現MouseEntered和MouseExited方法 – ControlAltDel

@ControlAltDel我在** HighlightJPanelsChildMouseListeners **中這樣做了，但是如果我在** HighlightJPanelsContainerMouseListener **中這麼做的話，那麼它會突出顯示父母。 –

的問題是由你如何找到JPanel突出造成的，在這條線：

Component comp = HighlightJPanels.container.findComponentAt(HighlightJPanelsContainerMouseListener.eX, HighlightJPanelsContainerMouseListener.eY);

幸運的是，已經會做你想要什麼功能。你可以在事件上使用getSource()，它會告訴你哪個面板要突出顯示。因此，改變你的功能，這一點：

public void mouseEntered(MouseEvent e) { 
    JPanel parent = (JPanel)e.getSource(); 
    parent.setBorder(grayBorder); 
    parent.revalidate(); 
}

，做同樣的事情mouseExited，你會看到它突出顯示正確的面板。這將消除對HighlightJPanelsContainerMouseListener的需求。

來源

2016-11-23 16:15:37 resueman

如何突出顯示鼠標懸停時的JPanel？

回答

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