问题
I'm trying to create a menu slider from the left side of the frame. It need to be floating above the content, where i can access it always with a mouse listener(open the menu when the mouse is close to the left edge).
Well, I set my GlassPane (My JPanel ) as setOpaue(false) and it was floating above the content. but the glasspane always positioned on the center, and I need to have a possibility to move it,slide it, but with no luck.
the setBounds and setLocation does not worked for me.
Can any one please help me with this ?
Part of Code :
public class MYFrame extends JFrame {
public MYFrame(){
this.setLayout(new BorderLayout());
this.add(panel1,BorderLayout.NORTH);
this.add(panel2,BorderLayout.CENTER);
this.add(panel3,BorderLayout.EAST);
this.getRootPane().setGlassPane(new MyGlass());
this.getRootPane().getGlassPane().setVisible(true);
this.setVisible(true);
}
public class MyGlass extends JPanel{
ImageIcon imageIcon = new ImageIcon("BG.png");
JLabel label = new JLabel(imageIcon);
public MyGlass(){
this.add(label);
this.setOpaque(false);
this.pack();
this.setVisible(true);
}
}
}
回答1:
The glassPane will always cover the entire viewable area (content) of the window, this is how it's designed.
What you will want to do is, instead, add your MyGlass panel to the frame's glassPane. This will, at least, provide you with control to move it.
Now, having said, I would recommend having a look at
- java-universal-tween-engine
- sliding-layout
And see if it helps.
As a wild proof of concept...
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.LayoutManager;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.io.File;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.Timer;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class Test {
public static void main(String[] args) {
new Test();
}
public Test() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new TestPane());
frame.setGlassPane(new GlassPane());
frame.getGlassPane().setVisible(true);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
public TestPane() {
setLayout(new BorderLayout());
try {
add(new JLabel(new ImageIcon(ImageIO.read(new File("....jpg")))));
} catch (IOException ex) {
ex.printStackTrace();
}
}
}
public class GlassPane extends JPanel {
private MenuPane menuPane;
public GlassPane() {
setOpaque(false);
menuPane = new MenuPane();
add(menuPane);
setLayout(new SlidingMenuLayoutManager());
menuPane.addMouseListener(new MouseAdapter() {
@Override
public void mouseEntered(MouseEvent e) {
((SlidingMenuLayoutManager)getLayout()).open();
}
@Override
public void mouseExited(MouseEvent e) {
((SlidingMenuLayoutManager)getLayout()).close();
}
});
}
protected class SlidingMenuLayoutManager implements LayoutManager {
private int offSet = 10;
private int delta = 2;
private Timer slider;
public SlidingMenuLayoutManager() {
slider = new Timer(10, new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
System.out.println("...");
offSet += delta;
if (offSet <= 10) {
offSet = 10;
((Timer) e.getSource()).stop();
} else if (offSet >= menuPane.getWidth()) {
offSet = menuPane.getWidth();
((Timer) e.getSource()).stop();
}
menuPane.getParent().revalidate();
menuPane.getParent().repaint();
}
});
}
public void open() {
slider.stop();
delta = 2;
slider.start();
}
public void close() {
slider.stop();
delta = -2;
slider.start();
}
@Override
public void addLayoutComponent(String name, Component comp) {
}
@Override
public void removeLayoutComponent(Component comp) {
}
@Override
public Dimension preferredLayoutSize(Container parent) {
Dimension size = menuPane.getPreferredSize();
size.width *= 2;
return size;
}
@Override
public Dimension minimumLayoutSize(Container parent) {
return preferredLayoutSize(parent);
}
@Override
public void layoutContainer(Container parent) {
Dimension size = menuPane.getPreferredSize();
size.height = parent.getHeight();
menuPane.setSize(size);
int maxWidth = size.width;
int xPos = offSet - maxWidth;
menuPane.setLocation(xPos, 0);
}
}
}
public class MenuPane extends JPanel {
public MenuPane() {
setOpaque(false);
setBackground(new Color(0, 0, 255, 128));
}
@Override
public Dimension getPreferredSize() {
return new Dimension(100, 100);
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
g.setColor(getBackground());
g.fillRect(0, 0, getWidth(), getHeight());
}
}
}
来源：https://stackoverflow.com/questions/28668955/how-to-set-the-position-of-glasspane-in-jframe