Source for javax.swing.plaf.metal.MetalMenuBarUI

   1: /* MetalMenuBarUI.java -- MenuBar UI for the Metal L&F
   2:    Copyright (C) 2005, 2006 Free Software Foundation, Inc.
   3: 
   4: This file is part of GNU Classpath.
   5: 
   6: GNU Classpath is free software; you can redistribute it and/or modify
   7: it under the terms of the GNU General Public License as published by
   8: the Free Software Foundation; either version 2, or (at your option)
   9: any later version.
  10: 
  11: GNU Classpath is distributed in the hope that it will be useful, but
  12: WITHOUT ANY WARRANTY; without even the implied warranty of
  13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14: General Public License for more details.
  15: 
  16: You should have received a copy of the GNU General Public License
  17: along with GNU Classpath; see the file COPYING.  If not, write to the
  18: Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19: 02110-1301 USA.
  20: 
  21: Linking this library statically or dynamically with other modules is
  22: making a combined work based on this library.  Thus, the terms and
  23: conditions of the GNU General Public License cover the whole
  24: combination.
  25: 
  26: As a special exception, the copyright holders of this library give you
  27: permission to link this library with independent modules to produce an
  28: executable, regardless of the license terms of these independent
  29: modules, and to copy and distribute the resulting executable under
  30: terms of your choice, provided that you also meet, for each linked
  31: independent module, the terms and conditions of the license of that
  32: module.  An independent module is a module which is not derived from
  33: or based on this library.  If you modify this library, you may extend
  34: this exception to your version of the library, but you are not
  35: obligated to do so.  If you do not wish to do so, delete this
  36: exception statement from your version. */
  37: 
  38: 
  39: package javax.swing.plaf.metal;
  40: 
  41: import java.awt.Graphics;
  42: 
  43: import javax.swing.JComponent;
  44: import javax.swing.SwingConstants;
  45: import javax.swing.UIManager;
  46: import javax.swing.plaf.ComponentUI;
  47: import javax.swing.plaf.UIResource;
  48: import javax.swing.plaf.basic.BasicMenuBarUI;
  49: 
  50: /**
  51:  * A UI implementation for MenuBar in the Metal Look & Feel.
  52:  *
  53:  * @author Roman Kennke (kennke@aicas.com)
  54:  *
  55:  * @since 1.5
  56:  */
  57: public class MetalMenuBarUI extends BasicMenuBarUI
  58: {
  59:   /**
  60:    * Creates and returns a new instance of this UI for the specified component.
  61:    *
  62:    * @param c the component to create a UI for
  63:    *
  64:    * @return the UI for the component
  65:    */
  66:   public static ComponentUI createUI(JComponent c)
  67:   {
  68:     return new MetalMenuBarUI();
  69:   }
  70: 
  71: 
  72:   /**
  73:    * If the property <code>MenuBar.gradient</code> is set, then a gradient
  74:    * is painted as background, otherwise the normal superclass behaviour is
  75:    * called.
  76:    */
  77:   public void update(Graphics g, JComponent c)
  78:   {
  79:     int height = c.getHeight();
  80:     if (c.isOpaque()
  81:         && UIManager.get("MenuBar.gradient") != null
  82:         && c.getBackground() instanceof UIResource
  83:         && height > 2)
  84:       {
  85:         MetalUtils.paintGradient(g, 0, 0, c.getWidth(), height,
  86:                                  SwingConstants.VERTICAL, "MenuBar.gradient");
  87: 
  88:         paint(g, c);
  89:       }
  90:     else
  91:       super.update(g, c);
  92:   }
  93: 
  94: }