jdk/src/java.desktop/share/classes/javax/swing/plaf/basic/BasicViewportUI.java
author weijun
Thu, 11 Dec 2014 15:19:12 +0800
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parent 25859 3317bb8137f4
permissions -rw-r--r--
8067207: Replace concat String to append in StringBuilder parameters (client) Reviewed-by: serb Contributed-by: Otavio Santana <otaviojava@java.net>
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/*
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 * Copyright (c) 1998, 2014, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.  Oracle designates this
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 * particular file as subject to the "Classpath" exception as provided
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 * by Oracle in the LICENSE file that accompanied this code.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 */
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package javax.swing.plaf.basic;
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import java.awt.*;
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import javax.swing.*;
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import javax.swing.border.*;
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import javax.swing.plaf.*;
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import java.awt.*;
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import java.awt.event.*;
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/**
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 * BasicViewport implementation
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 *
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 * @author Rich Schiavi
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 */
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public class BasicViewportUI extends ViewportUI {
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    // Shared UI object
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    private static ViewportUI viewportUI;
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    /**
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     * Returns an instance of {@code BasicViewportUI}.
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     *
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     * @param c a component
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     * @return an instance of {@code BasicViewportUI}
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     */
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    public static ComponentUI createUI(JComponent c) {
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        if(viewportUI == null) {
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            viewportUI = new BasicViewportUI();
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        }
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        return viewportUI;
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    }
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    public void installUI(JComponent c) {
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        super.installUI(c);
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        installDefaults(c);
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    }
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    public void uninstallUI(JComponent c) {
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        uninstallDefaults(c);
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        super.uninstallUI(c);
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    }
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    /**
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     * Installs view port properties.
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     *
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     * @param c a component
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     */
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    protected void installDefaults(JComponent c) {
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        LookAndFeel.installColorsAndFont(c,
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                                         "Viewport.background",
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                                         "Viewport.foreground",
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                                         "Viewport.font");
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        LookAndFeel.installProperty(c, "opaque", Boolean.TRUE);
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    }
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    /**
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     * Uninstall view port properties.
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     *
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     * @param c a component
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     */
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    protected void uninstallDefaults(JComponent c) {
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    }
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}