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/*
* Copyright 2013 Google Inc.
*
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*
*/
#ifndef SkV8Example_DEFINED
#define SkV8Example_DEFINED
#include <v8.h>
#include "SkWindow.h"
using namespace v8;
class SkCanvas;
class JsCanvas;
class SkV8ExampleWindow : public SkOSWindow {
public:
SkV8ExampleWindow(void* hwnd, JsCanvas* canvas);
protected:
virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE;
#ifdef SK_BUILD_FOR_WIN
virtual void onHandleInval(const SkIRect&) SK_OVERRIDE;
#endif
private:
typedef SkOSWindow INHERITED;
SkScalar fRotationAngle;
JsCanvas* fJsCanvas;
};
// Provides the canvas 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(canvas) {
// canvas.drawRect();
// canvas.inval();
// }
//
class JsCanvas {
public:
JsCanvas(Isolate* isolate)
: fIsolate(isolate)
, fCanvas(NULL)
, fWindow(NULL)
{}
~JsCanvas();
// Parse the script.
bool initialize(const char script[]);
// Call this with the SkCanvas you want onDraw to draw on.
void onDraw(SkCanvas* canvas, SkOSWindow* window);
private:
// Implementation of the canvas.drawRect() JS function.
static void drawRect(const v8::FunctionCallbackInfo<Value>& args);
// Implementation of the canvas.inval() JS function.
static void inval(const v8::FunctionCallbackInfo<Value>& args);
// Get the pointer out of obj.
static JsCanvas* unwrap(Handle<Object> obj);
// Create a template for JS object associated with JsCanvas, called lazily
// by Wrap() and the results are stored in fCanvasTemplate;
Handle<ObjectTemplate> makeCanvasTemplate();
// Wrap the 'this' pointer into an Object. Can be retrieved via Unwrap.
Handle<Object> wrap();
Isolate* fIsolate;
// Only valid when inside OnDraw().
SkCanvas* fCanvas;
// Only valid when inside OnDraw().
SkOSWindow* fWindow;
// The context that the script will be parsed into.
Persistent<Context> fContext;
// A handle to the onDraw function defined in the script.
Persistent<Function> fOnDraw;
// The template for what a canvas object looks like. The canvas object is
// what's passed into the JS onDraw() function.
static Persistent<ObjectTemplate> fCanvasTemplate;
};
#endif
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