1 /*
   2  * Copyright (c) 2015, 2017, 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;
  27 
  28 import javafx.beans.value.ChangeListener;
  29 import javafx.collections.ListChangeListener;
  30 import javafx.scene.AccessibleAttribute;
  31 import javafx.scene.AccessibleRole;
  32 import javafx.scene.control.Menu;
  33 import javafx.scene.control.MenuButton;
  34 import javafx.scene.control.MenuItem;
  35 import javafx.scene.control.skin.MenuBarSkin;
  36 
  37 public class MenuBarButton extends MenuButton {
  38     public ChangeListener<Boolean> menuListener;
  39     public MenuBarSkin menuBarSkin;
  40     public Menu menu;
  41 
  42     private final ListChangeListener<MenuItem> itemsListener;
  43     private final ListChangeListener<String> styleClassListener;
  44 
  45     public MenuBarButton(MenuBarSkin menuBarSkin, Menu menu) {
  46         super(menu.getText(), menu.getGraphic());
  47         this.menuBarSkin = menuBarSkin;
  48         setAccessibleRole(AccessibleRole.MENU);
  49 
  50         // listen to changes in menu items & update menuButton items
  51         menu.getItems().addListener(itemsListener = c -> {
  52             while (c.next()) {
  53                 getItems().removeAll(c.getRemoved());
  54                 getItems().addAll(c.getFrom(), c.getAddedSubList());
  55             }
  56         });
  57         menu.getStyleClass().addListener(styleClassListener = c -> {
  58             while(c.next()) {
  59                 for(int i=c.getFrom(); i<c.getTo(); i++) {
  60                     getStyleClass().add(menu.getStyleClass().get(i));
  61                 }
  62                 for (String str : c.getRemoved()) {
  63                     getStyleClass().remove(str);
  64                 }
  65             }
  66         });
  67         idProperty().bind(menu.idProperty());
  68     }
  69 
  70     public MenuBarSkin getMenuBarSkin() {
  71         return menuBarSkin;
  72     }
  73 
  74     public void clearHover() {
  75         setHover(false);
  76     }
  77 
  78     public void setHover() {
  79         setHover(true);
  80 
  81             /* Transfer the a11y focus to an item in the menu bar. */
  82         menuBarSkin.getSkinnable().notifyAccessibleAttributeChanged(AccessibleAttribute.FOCUS_NODE);
  83     }
  84 
  85     public void dispose() {
  86         menu.getItems().removeListener(itemsListener);
  87         menu.getStyleClass().removeListener(styleClassListener);
  88         idProperty().unbind();
  89     }
  90 
  91     @Override
  92     public Object queryAccessibleAttribute(AccessibleAttribute attribute, Object... parameters) {
  93         switch (attribute) {
  94             case FOCUS_ITEM: return MenuBarButton.this;
  95             default: return super.queryAccessibleAttribute(attribute, parameters);
  96         }
  97     }
  98 }