JDK8/Java8源码在线阅读

/*
 * Copyright (c) 2002, 2012, 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.synth;

import javax.swing.*;
import javax.swing.plaf.ComboBoxUI;
import javax.swing.plaf.basic.BasicComboPopup;
import java.awt.*;


/**
 * Synth's ComboPopup.
 *
 * @author Scott Violet
 */
class SynthComboPopup extends BasicComboPopup {
    public SynthComboPopup( JComboBox combo ) {
        super(combo);
    }

    /**
     * Configures the list which is used to hold the combo box items in the
     * popup. This method is called when the UI class
     * is created.
     *
     * @see #createList
     */
    @Override
    protected void configureList() {
        list.setFont( comboBox.getFont() );
        list.setCellRenderer( comboBox.getRenderer() );
        list.setFocusable( false );
        list.setSelectionMode( ListSelectionModel.SINGLE_SELECTION );
        int selectedIndex = comboBox.getSelectedIndex();
        if ( selectedIndex == -1 ) {
            list.clearSelection();
        }
        else {
            list.setSelectedIndex( selectedIndex );
            list.ensureIndexIsVisible( selectedIndex );
        }
        installListListeners();
    }

    /**
     * @inheritDoc
     *
     * Overridden to take into account any popup insets specified in
     * SynthComboBoxUI
     */
    @Override
    protected Rectangle computePopupBounds(int px, int py, int pw, int ph) {
        ComboBoxUI ui = comboBox.getUI();
        if (ui instanceof SynthComboBoxUI) {
            SynthComboBoxUI sui = (SynthComboBoxUI) ui;
            if (sui.popupInsets != null) {

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