我希望有一个JComponent放置并与其他组件共享空间，具体取决于我在运行时选择的配置。对于第一个配置，JComponent放置在BorderLayout东侧或西侧，并与框架中的其他组件共享空间。对于第二种配置，JComponent必须将其放在所有其他组件的顶部，将它们重叠并让它们调整大小。
我所做的是创建一个JPanel带有 a 的BorderLayout并将其全部放置在我JComponent的 NORTH、CENTER 和 EAST 侧。这是初始配置。我将它JPanel放在JLayeredPaneDefaultLayer 层中，并将其设置JLayeredPane为我的JFrame. 我想用它JLayeredPane来放置东侧JComponent在上层（如果选择了第二个配置）并将其放回 DefaultLayer（如果选择了第一个配置）。
希望我很清楚并提供足够的细节以获得一些帮助。提前致谢。
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Rectangle;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.ButtonGroup;
import javax.swing.JFrame;
import javax.swing.JLayeredPane;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.JToggleButton;
/**
* @see http://stackoverflow.com/q/13776251/230513
*/
public class NewJavaGUI {
class Desktop {
private JPanel desktop;
private JLayeredPane layeredPane;
private HidingArea hidingArea;
private final JToggleButton toggleShowHide;
public Desktop() {
desktop = new JPanel(new BorderLayout(5, 5));
desktop.setBounds(0, 0, 600, 400);
layeredPane = new JLayeredPane(){
@Override
public Dimension getPreferredSize() {
return new Dimension(800, 400);
}
};
layeredPane.add(desktop);
NorthArea northArea = new NorthArea();
northArea.setLayout(new BoxLayout(northArea, BoxLayout.LINE_AXIS));
toggleShowHide = new JToggleButton("Show");
toggleShowHide.addItemListener(new ShowHideItemListener());
JRadioButton conf1btn = new JRadioButton("In desktop");
conf1btn.setOpaque(false);
JRadioButton conf2btn = new JRadioButton("In layered pane");
conf2btn.setOpaque(false);
ButtonGroup group = new ButtonGroup();
group.add(conf1btn);
group.add(conf2btn);
northArea.add(conf1btn);
northArea.add(conf2btn);
northArea.add(Box.createHorizontalGlue());
northArea.add(toggleShowHide);
conf1btn.addActionListener(new SetComponentInDesktopListener());
conf2btn.addActionListener(new SetComponentInLayeredPaneListener());
desktop.add(northArea, BorderLayout.PAGE_START);
desktop.add(new CenterArea(), BorderLayout.CENTER);
hidingArea = new HidingArea();
desktop.add(hidingArea, BorderLayout.LINE_END);
conf1btn.setSelected(true);
}
/**
* The layered pane is added to the contentPane of a JFrame
*/
JLayeredPane getComponent() {
return layeredPane;
}
private class HidingArea extends JPanel {
public HidingArea() {
setBackground(Color.darkGray);
}
@Override
public Dimension getPreferredSize() {
return new Dimension(200, 400);
}
@Override
public Dimension getMinimumSize() {
return new Dimension(200, 350);
}
}
private class NorthArea extends JPanel {
public NorthArea() {
setBackground(Color.gray);
}
@Override
public Dimension getPreferredSize() {
return new Dimension(600, 50);
}
@Override
public Dimension getMinimumSize() {
return new Dimension(600, 50);
}
}
private class CenterArea extends JPanel {
public CenterArea() {
setBackground(Color.white);
}
@Override
public Dimension getPreferredSize() {
return new Dimension(400, 400);
}
@Override
public Dimension getMinimumSize() {
return new Dimension(400, 400);
}
}
/**
* Hide or show the area contained in the JLayeredPane.
*/
private class ShowHideItemListener implements ItemListener {
@Override
public void itemStateChanged(ItemEvent e) {
JToggleButton toggle = (JToggleButton) e.getSource();
if (e.getStateChange() == ItemEvent.SELECTED) {
toggle.setText("Hide");
hidingArea.setBounds(
getBounds().width - hidingArea.getPreferredSize().width,
getBounds().height - hidingArea.getPreferredSize().height,
hidingArea.getPreferredSize().width,
hidingArea.getPreferredSize().height);
} else {
toggle.setText("Show");
hidingArea.setBounds(
getBounds().width,
getBounds().height - hidingArea.getPreferredSize().height,
hidingArea.getPreferredSize().width,
hidingArea.getPreferredSize().height);
}
}
}
/**
* @return the rectangular dimensions of the desktop.
*/
private Rectangle getBounds() {
return desktop.getBounds();
}
/**
* Add Hiding area to desktop.
*/
private class SetComponentInDesktopListener implements ActionListener {
@Override
public void actionPerformed(ActionEvent e) {
toggleShowHide.setEnabled(false);
Component[] components = desktop.getComponents();
boolean toAdd = true;
for (Component component : components) {
if (component.equals(hidingArea)) {
toAdd = false;
}
}
if (toAdd) {
desktop.add(hidingArea, BorderLayout.LINE_END);
}
}
}
/**
* Remove Hiding area from desktop and add it to the JLayeredPane.
*/
private class SetComponentInLayeredPaneListener implements ActionListener {
@Override
public void actionPerformed(ActionEvent e) {
toggleShowHide.setEnabled(true);
desktop.remove(hidingArea);
getComponent().add(hidingArea, (Integer) (JLayeredPane.DEFAULT_LAYER + 50));
}
}
}
private void display() {
JFrame f = new JFrame("NewJavaGUI");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Desktop d = new Desktop();
f.add(d.getComponent());
f.pack();
f.setLocationRelativeTo(null);
f.setVisible(true);
}
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
new NewJavaGUI().display();
}
});
}
}