我有一个JFrame和一堆JComponents在上面JFrame。我需要使用JGlassPane并且我使用这个实现来设置它。
JPanel glass = new JPanel();
frame.setGlassPane(glass);
glass.setVisible(true);
glass.setOpaque(false);
JButtons这样做后，我无法JComponents在JGlassPane.
有没有一种方法可以只选择组件上的组件，GlassPane同时仍然能够选择组件下的组件GlassPane？
编辑我忘了提到（不知道这是否相关）我确实将 aMouseListener和 a都附加MouseMotionListener到了玻璃窗格上。有没有办法将鼠标事件传递给其他组件并仅在需要时使用它们？
让你的 mouseListener 调度它不想处理的事件。
下面的示例代码是混合使用的，使用了@whiskeyspider的漂亮 SSCCE 和教程（顺便说一句：查看教程是解决问题的良好开端:-)
ml = new MouseListener() {
@Override
public void mousePressed(MouseEvent e) {
dispatchEvent(e);
}
// same for all methods
// ....
private void dispatchEvent(MouseEvent e) {
if (isBlocked)
return;
Point glassPanePoint = e.getPoint();
Container container = frame.getContentPane();
Point containerPoint = SwingUtilities.convertPoint(glass,
glassPanePoint, container);
if (containerPoint.y < 0) { // we're not in the content pane
// Could have special code to handle mouse events over
// the menu bar or non-system window decorations, such as
// the ones provided by the Java look and feel.
} else {
// The mouse event is probably over the content pane.
// Find out exactly which component it's over.
Component component = SwingUtilities.getDeepestComponentAt(
container, containerPoint.x, containerPoint.y);
if (component != null) {
// Forward events to component below
Point componentPoint = SwingUtilities.convertPoint(
glass, glassPanePoint, component);
component.dispatchEvent(new MouseEvent(component, e
.getID(), e.getWhen(), e.getModifiers(),
componentPoint.x, componentPoint.y, e
.getClickCount(), e.isPopupTrigger()));
}
}
}
};
glass.addMouseListener(ml);
glassButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
if (isBlocked) {
// glass.removeMouseListener(ml);
glassButton.setText("Block");
} else {
// ml = new MouseAdapter() { };
// glass.addMouseListener(ml);
glassButton.setText("Unblock");
}
isBlocked = !isBlocked;
}
});
这是玻璃窗格中的 JButton 示例，单击该按钮将切换捕获鼠标事件（无法单击测试按钮）。
public class Test
{
private static boolean isBlocked = false;
private static MouseListener ml;
public static void main(String[] args)
{
JButton button = new JButton("Test");
button.setPreferredSize(new Dimension(100, 100));
final JButton glassButton = new JButton("Block");
JPanel panel = new JPanel();
panel.add(button);
final JPanel glass = new JPanel();
glass.setOpaque(false);
glass.add(glassButton);
final JFrame frame = new JFrame();
frame.setGlassPane(glass);
glass.setVisible(true);
frame.setContentPane(panel);
frame.pack();
frame.setVisible(true);
glassButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
if (isBlocked) {
glass.removeMouseListener(ml);
glassButton.setText("Block");
} else {
ml = new MouseAdapter() { };
glass.addMouseListener(ml);
glassButton.setText("Unblock");
}
isBlocked = !isBlocked;
}
});
}
}
另一种不中断 Swing 事件链的解决方案是使用 aAWTEventListener代替。我已经实现了 aBetterGlassPane来代替常规的JPanel玻璃窗格，如下所示：
JFrame frame = ...; // any JRootPane will do...
BetterGlassPane glass = new BetterGlassPane(frame);
这也适用于“传统”方式，如您的问题所示：
JPanel glass = new BetterGlassPane();
frame.setGlassPane(glass);
glass.setRootPane(frame);
希望这可以帮助。随意在 GitHub 上克隆项目或使用 Maven 依赖项：
<dependency>
<groupId>lc.kra.swing</groupId>
<artifactId>better-glass-pane</artifactId>
<version>0.1.3</version>
</dependency>
<repositories>
<repository>
<id>better-glass-pane-mvn-repo</id>
<url>https://raw.github.com/kristian/better-glass-pane/mvn-repo/</url>
<snapshots>
<enabled>true</enabled>
<updatePolicy>always</updatePolicy>
</snapshots>
</repository>
</repositories>
简短、自包含、正确、示例（SSCCE，没有强制性的 Maven 依赖）：
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Rectangle;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import lc.kra.swing.BetterGlassPane;
public class TestBetterGlassPane {
public static void main(String[] args) {
final JFrame frame = new JFrame("BetterGlassPane Test");
frame.setLayout(null);
frame.setSize(400,300);
frame.setResizable(false);
frame.setLocationByPlatform(true);
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
BetterGlassPane glassPane = new BetterGlassPane(frame.getRootPane()) {
private static final long serialVersionUID = 1L;
@Override protected void paintComponent(Graphics graphics) {
super.paintComponent(graphics);
graphics.setColor(Color.BLACK);
graphics.drawRect(20,160,360,50);
graphics.setFont(graphics.getFont().deriveFont(Font.BOLD));
graphics.drawString("I'm the glass pane, click me!",120,190);
}
};
glassPane.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent event) {
if(new Rectangle(20,180,360,50).contains(event.getPoint()))
JOptionPane.showMessageDialog(frame,"I'm the glass pane!");
}
});
glassPane.setLayout(null);
ActionListener defaultActionListener = new ActionListener() {
public void actionPerformed(ActionEvent event) {
JOptionPane.showMessageDialog(frame,
((JButton)event.getSource()).getText());
}
};
JButton frameButton = new JButton("I'm on the frame!");
frameButton.addActionListener(defaultActionListener);
frameButton.setBounds(20,20,360,50);
frame.add(frameButton);
JButton glassPaneButton = new JButton("I'm on the glass pane!");
glassPaneButton.addActionListener(defaultActionListener);
glassPaneButton.setBounds(20,90,360,50);
glassPane.add(glassPaneButton);
frame.setVisible(true);
}
}