您可以使用父框架的玻璃窗格,这将允许您向其中添加组件,这些组件将显示为覆盖在主要内容上。
基本上,我会创建一个JPanel
并将其设置为透明(setOpaque(false)
)。我会将其布局管理器设置为类似的GridBagLayout
(因为它将使用子组件的首选大小并自动将其在其父容器中居中)。
然后我会在这个面板上添加Settings
panel.
最后,我将父框架的玻璃窗格设置为第一个(背面)窗格并使其可见。
frame.getRootPane().setGlassPane(backingPane); // Or similar
看一眼如何使用根窗格
Updated
如果您自己无法使用顶层框架的玻璃板,那么您需要伪造它。
这个例子基本上使用了JLayeredPane
由一个支持GridBagLayout
如果您添加一个MouseListener
and KeyListener
在后台窗格中,您可以使用发送到子组件的事件。
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JLayeredPane;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.border.EmptyBorder;
public class FloatingPane {
public static void main(String[] args) {
new FloatingPane();
}
public FloatingPane() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
final WorkPane workPane = new WorkPane();
JButton settings = new JButton("Settings");
settings.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
workPane.toggleSettings();
}
});
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(workPane);
frame.add(settings, BorderLayout.SOUTH);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class WorkPane extends JLayeredPane {
private final BackingPane backingPane;
public WorkPane() {
setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 1;
gbc.gridy = 0;
gbc.weightx = 1;
gbc.weighty = 1;
gbc.fill = GridBagConstraints.BOTH;
add(createLabel("Center", Color.BLUE), gbc);
gbc.gridx = 0;
gbc.gridy = 0;
gbc.weightx = 0;
gbc.weighty = 0;
gbc.fill = GridBagConstraints.VERTICAL;
add(createLabel("Left", Color.RED), gbc);
gbc.gridx = 2;
add(createLabel("Right", Color.GREEN), gbc);
gbc.gridx = 0;
gbc.gridy = 0;
gbc.weightx = 1;
gbc.weighty = 1;
gbc.gridheight = GridBagConstraints.REMAINDER;
gbc.gridwidth = GridBagConstraints.REMAINDER;
gbc.fill = GridBagConstraints.BOTH;
backingPane = new BackingPane();
backingPane.add(new SettingsPane());
backingPane.setVisible(false);
add(backingPane, gbc);
setLayer(backingPane, DEFAULT_LAYER + 1);
}
public void toggleSettings() {
backingPane.setVisible(!backingPane.isVisible());
}
protected JLabel createLabel(String text, Color bg) {
JLabel label = new JLabel(text);
label.setHorizontalAlignment(JLabel.CENTER);
label.setOpaque(true);
label.setBackground(bg);
return label;
}
}
public class BackingPane extends JPanel {
public BackingPane() {
setLayout(new GridBagLayout());
setOpaque(false);
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
g.setColor(new Color(128, 128, 128, 192));
g.fillRect(0, 0, getWidth(), getHeight());
}
}
public class SettingsPane extends JPanel {
public SettingsPane() {
setBorder(new EmptyBorder(10, 10, 10, 10));
add(new JLabel("Settings"));
}
}
}
另一种解决方案可能是通过拍摄当前面板的快照并使用CardLayout
,翻转到设置窗格,使用快照作为设置窗格的背景图像(然后可以应用灰度和模糊等效果)