1 /*
   2  * Copyright (c) 2016, 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 com.sun.javafx.scene.layout.RegionHelper;
  29 import com.sun.javafx.util.Utils;
  30 import javafx.scene.Node;
  31 import javafx.scene.control.Control;
  32 
  33 /*
  34  * Used to access internal methods of Control.
  35  */
  36 public class ControlHelper extends RegionHelper {
  37     private static final ControlHelper theInstance;
  38     private static ControlAccessor controlAccessor;
  39 
  40     static {
  41         theInstance = new ControlHelper();
  42         Utils.forceInit(Control.class);
  43     }
  44 
  45     private static ControlHelper getInstance() {
  46         return theInstance;
  47     }
  48 
  49     public static void initHelper(Control control) {
  50         setHelper(control, getInstance());
  51     }
  52 
  53     public static void superProcessCSS(Node node) {
  54         ((ControlHelper) getHelper(node)).superProcessCSSImpl(node);
  55     }
  56 
  57     void superProcessCSSImpl(Node node) {
  58         super.processCSSImpl(node);
  59     }
  60 
  61     protected void processCSSImpl(Node node) {
  62         controlAccessor.doProcessCSS(node);
  63     }
  64 
  65 
  66     public static void setControlAccessor(final ControlAccessor newAccessor) {
  67         if (controlAccessor != null) {
  68             throw new IllegalStateException();
  69         }
  70 
  71         controlAccessor = newAccessor;
  72     }
  73 
  74     public interface ControlAccessor {
  75         void doProcessCSS(Node node);
  76     }
  77 
  78 }