关于研究Java中GlassPane的心得

整个JFrame，并起到截获鼠标事件等功能，但是一直没有亲手写过有

关的程序，今天和别人讨论问题时，刚好说到有关GlassPane的程序，我想当然地给了对方一个答复，结果他写完程序后发现有问题，这才让我自己想到要

去写个关于GlassPane的程序，我是按想当然的思路写的测试程序（其实很多人都是这么写的）：

JPanel glassPane = new JPanel();

glassPane.addMouseListener(new MouseListener(){

public void mouseEntered(MouseEvent e){}

public void mouseExited(MouseEvent e){}

public void mousePressed(MouseEvent e){}

public void mouseReleased(MouseEvent e){}

public void mouseClicked(MouseEvent e){

System.out.println("Click");

}

});

JFrame.setGlassPane(glassPanel);
很显然，我的本意是想用GlassPane去截获所有鼠标事件，并对单击事件会打印文字，但是运行后却完全没效果。
所以我猜测GlassPane并没有起作用，于是查了些资料，才发现原来错的多了，现给出正确的GlassPane的用法：

因为GlassPane在JRootPane中是一个Component

下面是人家API的源代码

<span style="font-size:18px;">public class JRootPane extends JComponent implements Accessible {
private static final String uiClassID = "RootPaneUI";
private static final boolean LOG_DISABLE_TRUE_DOUBLE_BUFFERING = ((Boolean) AccessController
.doPrivileged(new GetBooleanAction(
"swing.logDoubleBufferingDisable"))).booleanValue();
private static final boolean IGNORE_DISABLE_TRUE_DOUBLE_BUFFERING = ((Boolean) AccessController
.doPrivileged(new GetBooleanAction(
"swing.ignoreDoubleBufferingDisable"))).booleanValue();
public static final int NONE = 0;
public static final int FRAME = 1;
public static final int PLAIN_DIALOG = 2;
public static final int INFORMATION_DIALOG = 3;
public static final int ERROR_DIALOG = 4;
public static final int COLOR_CHOOSER_DIALOG = 5;
public static final int FILE_CHOOSER_DIALOG = 6;
public static final int QUESTION_DIALOG = 7;
public static final int WARNING_DIALOG = 8;
private int windowDecorationStyle;
protected JMenuBar menuBar;
protected Container contentPane;
protected JLayeredPane layeredPane;
protected Component glassPane;
protected JButton defaultButton;</span>

public class GlassPane extends JComponent implements MouseListener{

public GlassPane(){

this.addMouseListener(this);

}

public void paint(Graphics g)//重载Paint以保证GlassPane不透明

{}

public void mouseEntered(MouseEvent e){}

public void mouseExited(MouseEvent e){}

public void mousePressed(MouseEvent e){}

public void mouseReleased(MouseEvent e){}

public void mouseClicked(MouseEvent e){

System.out.println("Click");

}

}
在调用时，这样：
GlassPane gp = new GlassPane();
JFrame.setGlassPane(gp);
gp.setVisible(true)//这个是用于开启GlassPane 的
GlassPane的写法大致是这样，可以根据要求改写任何部分，虽然简单，但是因为一直都缺少相应的文档和资料以至于很多人都用不好，但是它强大的功能却是值得任何一个SWING开发人员注意的。