1 /*
   2  * Copyright (c) 2010, 2015, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package com.sun.javafx.scene.control.behavior;
  27 
  28 import javafx.scene.control.ComboBox;
  29 import javafx.scene.control.ComboBoxBase;
  30 import javafx.scene.control.SelectionModel;
  31 import com.sun.javafx.scene.control.inputmap.InputMap;
  32 
  33 import static javafx.scene.input.KeyCode.DOWN;
  34 import static javafx.scene.input.KeyCode.UP;
  35 
  36 public class ComboBoxListViewBehavior<T> extends ComboBoxBaseBehavior<T> {
  37 
  38     /***************************************************************************
  39      *                                                                         *
  40      * Constructors                                                            *
  41      *                                                                         *
  42      **************************************************************************/
  43     
  44     /**
  45      * 
  46      */
  47     public ComboBoxListViewBehavior(final ComboBox<T> comboBox) {
  48         super(comboBox);
  49 
  50         // Add these bindings as a child input map, so they take precedence
  51         InputMap<ComboBoxBase<T>> comboBoxListViewInputMap = new InputMap<>(comboBox);
  52         comboBoxListViewInputMap.getMappings().addAll(
  53             new InputMap.KeyMapping(UP, e -> selectPrevious()),
  54             new InputMap.KeyMapping(DOWN, e -> selectNext())
  55         );
  56         addDefaultChildMap(getInputMap(), comboBoxListViewInputMap);
  57     }
  58 
  59     /***************************************************************************
  60      *                                                                         *
  61      * Key event handling                                                      *
  62      *                                                                         *
  63      **************************************************************************/
  64 
  65     private ComboBox<T> getComboBox() {
  66         return (ComboBox<T>) getNode();
  67     }
  68 
  69     private void selectPrevious() {
  70         SelectionModel<T> sm = getComboBox().getSelectionModel();
  71         if (sm == null) return;
  72         sm.selectPrevious();
  73     }
  74     
  75     private void selectNext() {
  76         SelectionModel<T> sm = getComboBox().getSelectionModel();
  77         if (sm == null) return;
  78         sm.selectNext();
  79     }
  80 }