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This is a backport of OpenJFX 8 to run on Java 7.
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/*
 * Copyright (c) 2010, 2013, 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 com.sun.javafx.scene.control.behavior;

import javafx.scene.control.ComboBox;
import static javafx.scene.input.KeyCode.*;
import static javafx.scene.input.KeyEvent.*;

import java.util.ArrayList;
import java.util.List;

import javafx.scene.control.SelectionModel;

public class ComboBoxListViewBehavior extends ComboBoxBaseBehavior {

    /***************************************************************************
     *                                                                         *
     * Constructors                                                            *
     *                                                                         *
     **************************************************************************/
    
    /**
     * 
     */
    public ComboBoxListViewBehavior(final ComboBox comboBox) {
        super(comboBox);
    }

    /***************************************************************************
     *                                                                         *
     * Key event handling                                                      *
     *                                                                         *
     **************************************************************************/

    protected static final List COMBO_BOX_BINDINGS = new ArrayList();
    static {
        COMBO_BOX_BINDINGS.add(new KeyBinding(UP, KEY_PRESSED, "selectPrevious"));
        COMBO_BOX_BINDINGS.add(new KeyBinding(DOWN, "selectNext"));
        COMBO_BOX_BINDINGS.addAll(COMBO_BOX_BASE_BINDINGS);
    }

    @Override protected List createKeyBindings() {
        return COMBO_BOX_BINDINGS;
    }

    @Override protected void callAction(String name) {
        if ("selectPrevious".equals(name)) {
            selectPrevious();
        } else if ("selectNext".equals(name)) {
            selectNext();
        } else {
            super.callAction(name);
        }
    }
    
    private ComboBox getComboBox() {
        return (ComboBox) getControl();
    }

    private void selectPrevious() {
        SelectionModel sm = getComboBox().getSelectionModel();
        if (sm == null) return;
        sm.selectPrevious();
    }
    
    private void selectNext() {
        SelectionModel sm = getComboBox().getSelectionModel();
        if (sm == null) return;
        sm.selectNext();
    }
}