Java 在带边框布局的JPanel上浮动JPanel
我有一个名为Java 在带边框布局的JPanel上浮动JPanel,java,swing,layout,Java,Swing,Layout,我有一个名为pnlMain的JPanel，布局设置为BorderLayout。面板内部有三个JPanel添加到PAGE\u START、中心和PAGE\u END。现在，我的要求是，如果单击设置按钮，它将在pnlMain上方显示一个透明的JPanel。这个透明的面板将包含一个不透明的、较小的、居中的面板，其中将包含设置内容 我知道我可以使用JLayeredPane来实现这一点，但查看it时发现，您只能使用绝对定位来放置不同深度的组件，我知道这是非常不鼓励的 是否有其他方法可以在不使用绝对定位的情
pnlMainJPanelBorderLayoutJPanelPAGE\u START中心PAGE\u ENDpnlMainJPanelJLayeredPane是否有其他方法可以在不使用绝对定位的情况下执行此操作？您可以使用父框架的玻璃窗格，这将允许您向其添加看起来覆盖在主要内容上的组件 基本上，我会创建一个
JPanelsetOpaque（false）GridBagLayout设置frame.getRootPane().setGlassPane(backingPane); // Or similar
JLayeredPaneGridBagLayout鼠标侦听器键侦听器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
CardLayoutJLayeredPaneGridBagLayoutJPanelJPanelgetRootPane（）JLayerJXLayer