如何在JFrame中设置glasspane的位置？

Question

我试图从框架的左侧创建一个菜单滑块。 它需要被浮置的内容，其中，i可以用鼠标监听器（打开菜单当鼠标接近左边缘）总是访问它的上方。

好了，我把我的玻璃面板（我的JPanel）为setOpaue（假的），它是浮在上面的内容。 但玻璃窗总是位于中心，我需要有可能移动它，滑动它，但没有运气。

定义的setBounds和setLocation不会为我工作。

任何一个可以请帮我这个？代码的

部分：

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); 
     } 

    } 
    } 

Answer 1

的glassPane总是会覆盖窗口的整个可视区域（内容），这是它的设计方式。

您想要做的是将MyGlass面板添加到框架的glassPane。这至少会为您提供控制来移动它。现在

，话说回来，我会建议在看看

• java-universal-tween-engine
• sliding-layout

，看看它是否有帮助。

作为概念证明野生...

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()); 
     } 

    } 

}