JDK8/Java8源码在线阅读

/*
 * Copyright (c) 1998, 2000, 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 java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.plaf.*;
import javax.swing.border.*;
import java.io.Serializable;
import javax.swing.plaf.basic.BasicComboBoxUI;


/**
 * This utility class draws the horizontal bars which indicate a MetalComboBox
 *
 * @see MetalComboBoxUI
 * @author Tom Santos
 */
public class MetalComboBoxIcon implements Icon, Serializable {

    /**
     * Paints the horizontal bars for the
     */
    public void paintIcon(Component c, Graphics g, int x, int y){
        JComponent component = (JComponent)c;
        int iconWidth = getIconWidth();

        g.translate( x, y );

        g.setColor( component.isEnabled() ? MetalLookAndFeel.getControlInfo() : MetalLookAndFeel.getControlShadow() );
        g.drawLine( 0, 0, iconWidth - 1, 0 );
        g.drawLine( 1, 1, 1 + (iconWidth - 3), 1 );
        g.drawLine( 2, 2, 2 + (iconWidth - 5), 2 );
        g.drawLine( 3, 3, 3 + (iconWidth - 7), 3 );
        g.drawLine( 4, 4, 4 + (iconWidth - 9), 4 );


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