JDK8/Java8源码在线阅读

/*
 * Copyright (c) 1998, 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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package javax.swing.plaf.metal;

import sun.swing.SwingUtilities2;
import sun.awt.AppContext;

import javax.swing.*;
import javax.swing.plaf.*;
import javax.swing.plaf.basic.*;


import java.awt.*;


/**
 * A Windows L&F implementation of LabelUI.  This implementation
 * is completely static, i.e. there's only one UIView implementation
 * that's shared by all JLabel objects.
 *
 * @author Hans Muller
 */

public class MetalLabelUI extends BasicLabelUI
{
   /**
    * The default <code>MetalLabelUI</code> instance. This field might
    * not be used. To change the default instance use a subclass which
    * overrides the <code>createUI</code> method, and place that class
    * name in defaults table under the key "LabelUI".
    */
    protected static MetalLabelUI metalLabelUI = new MetalLabelUI();

    private static final Object METAL_LABEL_UI_KEY = new Object();

    public static ComponentUI createUI(JComponent c) {
        if (System.getSecurityManager() != null) {
            AppContext appContext = AppContext.getAppContext();
            MetalLabelUI safeMetalLabelUI =
                    (MetalLabelUI) appContext.get(METAL_LABEL_UI_KEY);
            if (safeMetalLabelUI == null) {
                safeMetalLabelUI = new MetalLabelUI();
                appContext.put(METAL_LABEL_UI_KEY, safeMetalLabelUI);
            }
            return safeMetalLabelUI;
        }
        return metalLabelUI;
    }

    /**
     * Just paint the text gray (Label.disabledForeground) rather than
     * in the labels foreground color.
     *
     * @see #paint
     * @see #paintEnabledText
     */

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