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.layout;
  27 
  28 import com.sun.javafx.geom.BaseBounds;
  29 import com.sun.javafx.geom.PickRay;
  30 import com.sun.javafx.geom.transform.BaseTransform;
  31 import com.sun.javafx.scene.ParentHelper;
  32 import com.sun.javafx.scene.input.PickResultChooser;
  33 import com.sun.javafx.sg.prism.NGNode;
  34 import com.sun.javafx.util.Utils;
  35 import javafx.geometry.Bounds;
  36 import javafx.scene.Node;
  37 import javafx.scene.layout.Region;
  38 
  39 /**
  40  * Used to access internal methods of Region.
  41  */
  42 public class RegionHelper extends ParentHelper {
  43 
  44     private static final RegionHelper theInstance;
  45     private static RegionAccessor regionAccessor;
  46 
  47     static {
  48         theInstance = new RegionHelper();
  49         Utils.forceInit(Region.class);
  50     }
  51 
  52     private static RegionHelper getInstance() {
  53         return theInstance;
  54     }
  55 
  56     public static void initHelper(Region region) {
  57         setHelper(region, getInstance());
  58     }
  59 
  60     @Override
  61     protected NGNode createPeerImpl(Node node) {
  62         return regionAccessor.doCreatePeer(node);
  63     }
  64 
  65     @Override
  66     protected void updatePeerImpl(Node node) {
  67         super.updatePeerImpl(node);
  68         regionAccessor.doUpdatePeer(node);
  69     }
  70 
  71     @Override
  72     protected Bounds computeLayoutBoundsImpl(Node node) {
  73         return regionAccessor.doComputeLayoutBounds(node);
  74     }
  75 
  76     @Override
  77     protected BaseBounds computeGeomBoundsImpl(Node node, BaseBounds bounds,
  78             BaseTransform tx) {
  79         regionAccessor.doComputeGeomBounds(node, bounds, tx);
  80         // NOTE: Okay to call computeGeomBoundsImpl with tx even in the 3D case
  81         // since Parent's computeGeomBoundsImpl does handle 3D correctly.
  82         BaseBounds cb = super.computeGeomBoundsImpl(node, bounds, tx);
  83         return regionAccessor.doComputeGeomBounds2(cb, node, bounds, tx);
  84     }
  85 
  86     @Override
  87     protected boolean computeContainsImpl(Node node, double localX, double localY) {
  88         return regionAccessor.doComputeContains(node, localX, localY);
  89     }
  90 
  91     @Override
  92     protected void notifyLayoutBoundsChangedImpl(Node node) {
  93         regionAccessor.doNotifyLayoutBoundsChanged(node);
  94     }
  95     @Override
  96     protected void pickNodeLocalImpl(Node node, PickRay localPickRay,
  97             PickResultChooser result) {
  98         regionAccessor.doPickNodeLocal(node, localPickRay, result);
  99     }
 100 
 101     public static void setRegionAccessor(final RegionAccessor newAccessor) {
 102         if (regionAccessor != null) {
 103             throw new IllegalStateException();
 104         }
 105 
 106         regionAccessor = newAccessor;
 107     }
 108 
 109     public interface RegionAccessor {
 110         void doUpdatePeer(Node node);
 111         NGNode doCreatePeer(Node node);
 112         Bounds doComputeLayoutBounds(Node node);
 113         BaseBounds doComputeGeomBounds(Node node, BaseBounds bounds, BaseTransform tx);
 114         BaseBounds doComputeGeomBounds2(BaseBounds cb, Node node, BaseBounds bounds, BaseTransform tx);
 115         boolean doComputeContains(Node node, double localX, double localY);
 116         void doNotifyLayoutBoundsChanged(Node node);
 117         void doPickNodeLocal(Node node, PickRay localPickRay,
 118             PickResultChooser result);
 119     }
 120 
 121 }