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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"
using namespace v8;
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:
JsContext(Global* global)
: fGlobal(global)
, fCanvas(NULL)
{
fFillStyle.setColor(SK_ColorBLACK);
fFillStyle.setAntiAlias(true);
fFillStyle.setStyle(SkPaint::kFill_Style);
fStrokeStyle.setColor(SK_ColorBLACK);
fStrokeStyle.setAntiAlias(true);
fStrokeStyle.setStyle(SkPaint::kStroke_Style);
}
~JsContext();
// Parse the script.
bool initialize();
// Call this with the SkCanvas you want onDraw to draw on.
void onDraw(SkCanvas* canvas);
private:
static void GetStyle(Local<String> name,
const PropertyCallbackInfo<Value>& info,
const SkPaint& style);
static void SetStyle(Local<String> name, Local<Value> value,
const PropertyCallbackInfo<void>& info,
SkPaint& style);
// JS Attributes
static void GetFillStyle(Local<String> name,
const PropertyCallbackInfo<Value>& info);
static void SetFillStyle(Local<String> name, Local<Value> value,
const PropertyCallbackInfo<void>& info);
static void GetStrokeStyle(Local<String> name,
const PropertyCallbackInfo<Value>& info);
static void SetStrokeStyle(Local<String> name, Local<Value> value,
const PropertyCallbackInfo<void>& info);
static void GetWidth(Local<String> name,
const PropertyCallbackInfo<Value>& info);
static void GetHeight(Local<String> name,
const PropertyCallbackInfo<Value>& info);
// JS Methods
static void FillRect(const v8::FunctionCallbackInfo<Value>& args);
static void Stroke(const v8::FunctionCallbackInfo<Value>& args);
static void Fill(const v8::FunctionCallbackInfo<Value>& args);
static void Rotate(const v8::FunctionCallbackInfo<Value>& args);
static void Save(const v8::FunctionCallbackInfo<Value>& args);
static void Restore(const v8::FunctionCallbackInfo<Value>& args);
static void Translate(const v8::FunctionCallbackInfo<Value>& args);
static void ResetTransform(const v8::FunctionCallbackInfo<Value>& args);
// Get the pointer out of obj.
static JsContext* Unwrap(Handle<Object> obj);
// Create a template for JS object associated with JsContext, called lazily
// by Wrap() and the results are stored in gContextTemplate;
Handle<ObjectTemplate> makeContextTemplate();
// Wrap the 'this' pointer into an Object. Can be retrieved via Unwrap.
Handle<Object> wrap();
Global* fGlobal;
// Only valid when inside OnDraw().
SkCanvas* fCanvas;
SkPaint fFillStyle;
SkPaint fStrokeStyle;
// A handle to the onDraw function defined in the script.
Persistent<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 Persistent<ObjectTemplate> gContextTemplate;
};
#endif
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