src/share/classes/sun/swing/JLightweightFrame.java

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   * questions.
   */
  
  package sun.swing;
  
+ import java.awt.AWTEvent;
  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.Graphics2D;
+ import java.awt.MouseInfo;
+ import java.awt.Point;
  import java.awt.Rectangle;
+ import java.awt.event.AWTEventListener;
+ import java.awt.event.ComponentAdapter;
+ import java.awt.event.ComponentEvent;
  import java.awt.event.ComponentListener;
  import java.awt.event.ContainerEvent;
  import java.awt.event.ContainerListener;
+ import java.awt.event.MouseEvent;
  import java.awt.image.BufferedImage;
  import java.awt.image.DataBufferInt;
  import java.beans.PropertyChangeEvent;
  import java.beans.PropertyChangeListener;
  import java.security.AccessController;
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  import javax.swing.JLayeredPane;
  import javax.swing.JPanel;
  import javax.swing.JRootPane;
  import javax.swing.LayoutFocusTraversalPolicy;
  import javax.swing.RootPaneContainer;
+ import javax.swing.SwingUtilities;
  
  import sun.awt.LightweightFrame;
+ import sun.awt.LightweightFramePeer;
  import sun.security.action.GetPropertyAction;
  
  /**
   * The frame serves as a lightweight container which paints its content
   * to an offscreen image and provides access to the image's data via the
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   * @author Artem Ananiev
   * @author Anton Tarasov
   */
  public final class JLightweightFrame extends LightweightFrame implements RootPaneContainer {
  
+     static {
+         SwingAccessor.setJLightweightFrameAccessor(new SwingAccessor.JLightweightFrameAccessor() {
+             @Override
+             public LightweightContent getLightweightContent(JLightweightFrame frame) {
+                 return frame.content;
+             }
+         });
+     }
+ 
      private final JRootPane rootPane = new JRootPane();
  
      private LightweightContent content;
  
      private Component component;
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                  }
              }
          };
      }
  
+     private LightweightFramePeer getLwPeer() {
+         return (LightweightFramePeer)getPeer();
+     }
+ 
+     private final AWTEventListener mouseEventListener = (AWTEvent event) -> {
+         MouseEvent m = (MouseEvent)event;
+ 
+         if (!SwingUtilities.isDescendingFrom(m.getComponent(), this)) return;
+ 
+         switch (m.getID()) {
+             case MouseEvent.MOUSE_ENTERED:
+                 getLwPeer().setLightweightFrameUnderMouse();
+                 getLwPeer().updateCursorImmediately();
+                 break;
+             case MouseEvent.MOUSE_EXITED:
+                 Point location = SwingUtilities.convertPoint(m.getComponent(), m.getPoint(), this);
+                 if ((!this.contains(location) || !this.isActive()) &&
+                         getLwPeer().cleanLightweightFrameUnderMouse()) {
+                     getLwPeer().updateCursorImmediately();
+                 }
+                 break;
+         }
+     };
+ 
+     private final ComponentListener componentListener =  new ComponentAdapter() {
+         @Override
+         public void componentShown(ComponentEvent e) {
+             if (getBounds().contains(MouseInfo.getPointerInfo().getLocation())) {
+                 getLwPeer().setLightweightFrameUnderMouse();
+                 getLwPeer().updateCursorImmediately();
+             }
+         }
+     };
+ 
+     @Override
+     public void addNotify() {
+         super.addNotify();
+         getToolkit().addAWTEventListener(mouseEventListener, AWTEvent.MOUSE_EVENT_MASK);
+         addComponentListener(componentListener);
+     }
+ 
+     @Override
+     public void removeNotify() {
+         super.removeNotify();
+         getToolkit().removeAWTEventListener(mouseEventListener);
+         removeComponentListener(componentListener);
+     }
+ 
      /**
       * Sets the {@link LightweightContent} instance for this frame.
       * The {@code JComponent} object returned by the
       * {@link LightweightContent#getComponent()} method is immediately
       * added to the frame's content pane.