1 /*
   2  * Copyright (c) 1998, 2013, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package javax.swing.plaf.metal;
  27 
  28 import sun.swing.SwingUtilities2;
  29 import sun.awt.AppContext;
  30 
  31 import javax.swing.*;
  32 import javax.swing.plaf.*;
  33 import javax.swing.plaf.basic.*;
  34 
  35 
  36 import java.awt.*;
  37 
  38 
  39 /**
  40  * A Windows L&F implementation of LabelUI.  This implementation
  41  * is completely static, i.e. there's only one UIView implementation
  42  * that's shared by all JLabel objects.
  43  *
  44  * @author Hans Muller
  45  */
  46 
  47 public class MetalLabelUI extends BasicLabelUI
  48 {
  49    /**
  50     * The default <code>MetalLabelUI</code> instance. This field might
  51     * not be used. To change the default instance use a subclass which
  52     * overrides the <code>createUI</code> method, and place that class
  53     * name in defaults table under the key "LabelUI".
  54     */
  55     protected static MetalLabelUI metalLabelUI = new MetalLabelUI();
  56 
  57     private static final Object METAL_LABEL_UI_KEY = new Object();
  58 
  59     /**
  60      * Returns an instance of {@code MetalLabelUI}.
  61      *
  62      * @param c a component
  63      * @return an instance of {@code MetalLabelUI}
  64      */
  65     public static ComponentUI createUI(JComponent c) {
  66         if (System.getSecurityManager() != null) {
  67             AppContext appContext = AppContext.getAppContext();
  68             MetalLabelUI safeMetalLabelUI =
  69                     (MetalLabelUI) appContext.get(METAL_LABEL_UI_KEY);
  70             if (safeMetalLabelUI == null) {
  71                 safeMetalLabelUI = new MetalLabelUI();
  72                 appContext.put(METAL_LABEL_UI_KEY, safeMetalLabelUI);
  73             }
  74             return safeMetalLabelUI;
  75         }
  76         return metalLabelUI;
  77     }
  78 
  79     /**
  80      * Just paint the text gray (Label.disabledForeground) rather than
  81      * in the labels foreground color.
  82      *
  83      * @see #paint
  84      * @see #paintEnabledText
  85      */
  86     protected void paintDisabledText(JLabel l, Graphics g, String s, int textX, int textY)
  87     {
  88         int mnemIndex = l.getDisplayedMnemonicIndex();
  89         g.setColor(UIManager.getColor("Label.disabledForeground"));
  90         SwingUtilities2.drawStringUnderlineCharAt(l, g, s, mnemIndex,
  91                                                    textX, textY);
  92     }
  93 }