JDK14/Java14源码在线阅读

/*
 * Copyright (c) 1998, 2014, 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
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package javax.swing.plaf.basic;

import java.awt.*;
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.plaf.*;
import java.awt.*;
import java.awt.event.*;


/**
 * BasicViewport implementation
 *
 * @author Rich Schiavi
 */
public class BasicViewportUI extends ViewportUI {

    // Shared UI object
    private static ViewportUI viewportUI;

    /**
     * Returns an instance of {@code BasicViewportUI}.
     *
     * @param c a component
     * @return an instance of {@code BasicViewportUI}
     */
    public static ComponentUI createUI(JComponent c) {
        if(viewportUI == null) {
            viewportUI = new BasicViewportUI();
        }
        return viewportUI;
    }

    public void installUI(JComponent c) {
        super.installUI(c);
        installDefaults(c);
    }

    public void uninstallUI(JComponent c) {
        uninstallDefaults(c);
        super.uninstallUI(c);
    }

    /**
     * Installs view port properties.
     *
     * @param c a component
     */
    protected void installDefaults(JComponent c) {
        LookAndFeel.installColorsAndFont(c,
                                         "Viewport.background",
                                         "Viewport.foreground",

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