Gets the layered pane of the window of the given component.

  
//package com.javadocking.util;

import java.awt.Window;

import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLayeredPane;
import javax.swing.JRootPane;
import javax.swing.JWindow;
import javax.swing.SwingUtilities;


/**
 * This class contains a collection of static utility methods for Swing.
 * 
 * @author Heidi Rakels.
 */
public class SwingUtil
{
  /**
   * Gets the layered pane of the window of the given component.
   * The window of the root pane should be a javax.swing.JFrame, javax.swing.JDialog
   * or javax.swing.JWindow. Otherwise the layered pane of the rootpane is returned.
   * 
   * @param   rootPane    The root pane whose layered pane is retrieved.
   * @return           The layered pane.
   */
  public static JLayeredPane getLayeredPane(JRootPane rootPane)
  {
    
    // Get the window of the component.
    Window window = SwingUtilities.getWindowAncestor(rootPane);
    if (window != null)
    {
      // Get the layered pane if we can find one.
      if (window instanceof JFrame) 
        return ((JFrame)window).getLayeredPane();
      if (window instanceof JDialog) 
        return ((JDialog)window).getLayeredPane();
      if (window instanceof JWindow) 
        return ((JWindow)window).getLayeredPane();
    }

    // Get the layered pane of the root pane immediately.
    return rootPane.getLayeredPane();
    
  }
}

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Gets the layered pane of the window of the given component. : Swing Utilities « Swing JFC « Java

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