1. /*

  2.  * @(#)CenterLayout.java	1.8 00/02/02

  3.  *

  4.  * Copyright 1998-2000 Sun Microsystems, Inc. All Rights Reserved.

  5.  * 

  6.  * This software is the proprietary information of Sun Microsystems, Inc.  

  7.  * Use is subject to license terms.

  8.  * 

  9.  */

  10. 

  11. package javax.swing.plaf.basic;

  12. 

  13. 

  14. import java.awt.*;

  15. import java.io.*;

  16. 

  17. /**

  18.   * Center-positioning layout manager.

  19.   * @version 1.8 02/02/00

  20.   * @author Tom Santos

  21.   * @author Steve Wilson

  22.   */

  23. class CenterLayout implements LayoutManager, Serializable {

  24.     public void addLayoutComponent(String name, Component comp) { }

  25.     public void removeLayoutComponent(Component comp) { }

  26. 

  27.     public Dimension preferredLayoutSize( Container container ) {

  28. 	Component c = container.getComponent( 0 );

  29. 	if ( c != null ) {

  30. 	    Dimension size = c.getPreferredSize();

  31. 	    Insets insets = container.getInsets();

  32. 	    size.width += insets.left + insets.right;

  33. 	    size.height += insets.top + insets.bottom;

  34. 	    return size;

  35. 	}

  36. 	else {

  37. 	    return new Dimension( 0, 0 );

  38. 	}

  39.     }

  40. 

  41.     public Dimension minimumLayoutSize(Container cont) {

  42.     	return preferredLayoutSize(cont);

  43.     }

  44. 

  45.     public void layoutContainer(Container container) {

  46. 	try {

  47. 	   Component c = container.getComponent( 0 );

  48. 

  49.            c.setSize( c.getPreferredSize() );

  50. 	   Dimension size = c.getSize();

  51.            Dimension containerSize = container.getSize();

  52. 	   Insets containerInsets = container.getInsets();

  53. 	   containerSize.width -= containerInsets.left + containerInsets.right;

  54. 	   containerSize.height -= containerInsets.top + containerInsets.bottom;

  55. 	   int componentLeft = (containerSize.width / 2) - (size.width / 2);

  56. 	   int componentTop = (containerSize.height / 2) - (size.height / 2);

  57. 	   componentLeft += containerInsets.left;

  58. 	   componentTop += containerInsets.top;

  59. 

  60. 	    c.setBounds( componentLeft, componentTop, size.width, size.height );

  61. 	 }

  62.          catch( Exception e ) {

  63.          }

  64.     }

  65. }