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 "DrawingMethods.h"
17
18class SkCanvas;
19class Global;
20
21// Provides the canvas context implementation in JS, and the OnDraw() method in
22// C++ that's used to bridge from C++ to JS. Should be used in JS as:
23//
24//  function onDraw(context) {
25//    context.fillStyle="#FF0000";
26//    context.fillRect(x, y, w, h);
27//  }
28class JsContext : public DrawingMethods {
29public:
30    JsContext(Global* global)
31            : INHERITED(global)
32            , fCanvas(NULL)
33    {
34    }
35    virtual ~JsContext() {}
36
37    // Parse the script.
38    bool initialize();
39
40    // Call this with the SkCanvas you want onDraw to draw on.
41    void onDraw(SkCanvas* canvas);
42
43    virtual SkCanvas* getCanvas() { return fCanvas; };
44
45private:
46
47    // Wrap the 'this' pointer into an Object. Can be retrieved via Unwrap.
48    v8::Handle<v8::Object> wrap();
49
50    // A handle to the onDraw function defined in the script.
51    v8::Persistent<v8::Function> fOnDraw;
52
53    // The template for what a canvas context object looks like. The canvas
54    // context object is what's passed into the JS onDraw() function.
55    static v8::Persistent<v8::ObjectTemplate> gContextTemplate;
56
57    // Only valid when inside OnDraw().
58    SkCanvas* fCanvas;
59
60    typedef DrawingMethods INHERITED;
61};
62
63#endif
64