1 /* 2 * Copyright 2014 Google Inc. 3 * 4 * 5 * Use of this source code is governed by a BSD-style license that can be 6 * found in the LICENSE file. 7 * 8 */ 9 10 #ifndef SkV8Example_JsContext_DEFINED 11 #define SkV8Example_JsContext_DEFINED 12 13 #include <v8.h> 14 15 #include "SkPaint.h" 16 #include "BaseContext.h" 17 18 using namespace v8; 19 20 class SkCanvas; 21 class Global; 22 23 // Provides the canvas context implementation in JS, and the OnDraw() method in 24 // C++ that's used to bridge from C++ to JS. Should be used in JS as: 25 // 26 // function onDraw(context) { 27 // context.fillStyle="#FF0000"; 28 // context.fillRect(x, y, w, h); 29 // } 30 class JsContext : public BaseContext { 31 public: JsContext(Global * global)32 JsContext(Global* global) 33 : INHERITED(global) 34 , fCanvas(NULL) 35 { 36 } ~JsContext()37 virtual ~JsContext() {} 38 39 // Parse the script. 40 bool initialize(); 41 42 // Call this with the SkCanvas you want onDraw to draw on. 43 void onDraw(SkCanvas* canvas); 44 getCanvas()45 virtual SkCanvas* getCanvas() { return fCanvas; }; 46 47 private: 48 49 // Wrap the 'this' pointer into an Object. Can be retrieved via Unwrap. 50 Handle<Object> wrap(); 51 52 // A handle to the onDraw function defined in the script. 53 Persistent<Function> fOnDraw; 54 55 // The template for what a canvas context object looks like. The canvas 56 // context object is what's passed into the JS onDraw() function. 57 static Persistent<ObjectTemplate> gContextTemplate; 58 59 // Only valid when inside OnDraw(). 60 SkCanvas* fCanvas; 61 62 typedef BaseContext INHERITED; 63 }; 64 65 #endif 66