JDK14/Java14源码在线阅读

/*
 * Copyright (c) 1997, 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
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package com.sun.java.swing.plaf.motif;

import javax.swing.*;
import javax.swing.plaf.*;
import javax.swing.tree.*;
import java.awt.*;
import java.awt.event.*;
import java.beans.*;
import java.io.*;
import java.util.*;

/**
 * Motif rendered to display a tree cell.
 * <p>
 * <strong>Warning:</strong>
 * Serialized objects of this class will not be compatible with
 * future Swing releases.  The current serialization support is appropriate
 * for short term storage or RMI between applications running the same
 * version of Swing.  A future release of Swing will provide support for
 * long term persistence.
 *
 * @author Jeff Dinkins
 */
@SuppressWarnings("serial") // Superclass is not serializable across versions
public class MotifTreeCellRenderer extends DefaultTreeCellRenderer
{
    static final int LEAF_SIZE = 13;
    static final Icon LEAF_ICON = new IconUIResource(new TreeLeafIcon());

    public MotifTreeCellRenderer() {
        super();
    }

    public static Icon loadLeafIcon() {
        return LEAF_ICON;
    }

    /**
     * Icon for a node with no children.
     * <p>
     * <strong>Warning:</strong>
     * Serialized objects of this class will not be compatible with
     * future Swing releases.  The current serialization support is appropriate
     * for short term storage or RMI between applications running the same
     * version of Swing.  A future release of Swing will provide support for
     * long term persistence.
     */
    @SuppressWarnings("serial") // Same-version serialization only
    public static class TreeLeafIcon implements Icon, Serializable {

        Color bg;
        Color shadow;
        Color highlight;

        public TreeLeafIcon() {
            bg = UIManager.getColor("Tree.iconBackground");
            shadow = UIManager.getColor("Tree.iconShadow");
            highlight = UIManager.getColor("Tree.iconHighlight");
        }

        public void paintIcon(Component c, Graphics g, int x, int y) {
            g.setColor(bg);

            y -= 3;
            g.fillRect(x + 4, y + 7, 5, 5);

            g.drawLine(x + 6, y + 6, x + 6, y + 6);
            g.drawLine(x + 3, y + 9, x + 3, y + 9);
            g.drawLine(x + 6, y + 12, x + 6, y + 12);
            g.drawLine(x + 9, y + 9, x + 9, y + 9);

            g.setColor(highlight);

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