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;
  27 
  28 import com.sun.javafx.geom.BaseBounds;
  29 import com.sun.javafx.geom.transform.BaseTransform;
  30 import static com.sun.javafx.scene.NodeHelper.setHelper;
  31 import com.sun.javafx.sg.prism.NGNode;
  32 import com.sun.javafx.util.Utils;
  33 import javafx.scene.Node;
  34 import javafx.scene.image.ImageView;
  35 
  36 /**
  37  * Used to access internal methods of ImageView.
  38  */
  39 public class ImageViewHelper extends NodeHelper {
  40 
  41     private static final ImageViewHelper theInstance;
  42     private static ImageViewAccessor imageViewAccessor;
  43 
  44     static {
  45         theInstance = new ImageViewHelper();
  46         Utils.forceInit(ImageView.class);
  47     }
  48 
  49     private static ImageViewHelper getInstance() {
  50         return theInstance;
  51     }
  52 
  53     public static void initHelper(ImageView imageView) {
  54         setHelper(imageView, getInstance());
  55     }
  56 
  57     @Override
  58     protected NGNode createPeerImpl(Node node) {
  59         return imageViewAccessor.doCreatePeer(node);
  60     }
  61 
  62     @Override
  63     protected void updatePeerImpl(Node node) {
  64         super.updatePeerImpl(node);
  65         imageViewAccessor.doUpdatePeer(node);
  66     }
  67 
  68     @Override
  69     protected BaseBounds computeGeomBoundsImpl(Node node, BaseBounds bounds,
  70             BaseTransform tx) {
  71         return imageViewAccessor.doComputeGeomBounds(node, bounds, tx);
  72     }
  73 
  74     @Override
  75     protected boolean computeContainsImpl(Node node, double localX, double localY) {
  76         return imageViewAccessor.doComputeContains(node, localX, localY);
  77     }
  78 
  79     public static void setImageViewAccessor(final ImageViewAccessor newAccessor) {
  80         if (imageViewAccessor != null) {
  81             throw new IllegalStateException();
  82         }
  83 
  84         imageViewAccessor = newAccessor;
  85     }
  86 
  87     public interface ImageViewAccessor {
  88         NGNode doCreatePeer(Node node);
  89         void doUpdatePeer(Node node);
  90         BaseBounds doComputeGeomBounds(Node node, BaseBounds bounds, BaseTransform tx);
  91         boolean doComputeContains(Node node, double localX, double localY);
  92     }
  93 
  94 }