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