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* Copyright 2014 Google Inc.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
#ifndef SkV8Example_JsContext_DEFINED
#define SkV8Example_JsContext_DEFINED
#include <v8.h>
#include "SkPaint.h"
#include "DrawingMethods.h"
class SkCanvas;
class Global;
// Provides the canvas context implementation in JS, and the OnDraw() method in
// C++ that's used to bridge from C++ to JS. Should be used in JS as:
// function onDraw(context) {
// context.fillStyle="#FF0000";
// context.fillRect(x, y, w, h);
// }
class JsContext : public DrawingMethods {
JsContext(Global* global)
: INHERITED(global)
, fCanvas(NULL)
virtual ~JsContext() {}
// Parse the script.
bool initialize();
// Call this with the SkCanvas you want onDraw to draw on.
void onDraw(SkCanvas* canvas);
virtual SkCanvas* getCanvas() { return fCanvas; };
// Wrap the 'this' pointer into an Object. Can be retrieved via Unwrap.
v8::Handle<v8::Object> wrap();
// A handle to the onDraw function defined in the script.
v8::Persistent<v8::Function> fOnDraw;
// The template for what a canvas context object looks like. The canvas
// context object is what's passed into the JS onDraw() function.
static v8::Persistent<v8::ObjectTemplate> gContextTemplate;
// Only valid when inside OnDraw().
SkCanvas* fCanvas;
typedef DrawingMethods INHERITED;