70 lines
2.2 KiB
C++
70 lines
2.2 KiB
C++
// Copyright 2013 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE.chromium file.
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#ifndef SHELL_COMMON_GIN_HELPER_WRAPPABLE_BASE_H_
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#define SHELL_COMMON_GIN_HELPER_WRAPPABLE_BASE_H_
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#include "v8/include/v8.h"
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namespace gin {
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class Arguments;
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}
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namespace gin_helper {
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// Wrappable is a base class for C++ objects that have corresponding v8 wrapper
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// objects. To retain a Wrappable object on the stack, use a gin::Handle.
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//
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// USAGE:
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// // my_class.h
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// class MyClass : Wrappable<MyClass> {
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// public:
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// ...
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// };
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//
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// Subclasses should also typically have private constructors and expose a
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// static Create function that returns a gin::Handle. Forcing creators through
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// this static Create function will enforce that clients actually create a
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// wrapper for the object. If clients fail to create a wrapper for a wrappable
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// object, the object will leak because we use the weak callback from the
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// wrapper as the signal to delete the wrapped object.
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class WrappableBase {
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public:
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WrappableBase();
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WrappableBase(const WrappableBase&) = delete;
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WrappableBase& operator=(const WrappableBase&) = delete;
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virtual ~WrappableBase();
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// Retrieve the v8 wrapper object corresponding to this object.
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v8::Local<v8::Object> GetWrapper() const;
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v8::MaybeLocal<v8::Object> GetWrapper(v8::Isolate* isolate) const;
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// Returns the Isolate this object is created in.
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v8::Isolate* isolate() const { return isolate_; }
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protected:
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// Called after the "_init" method gets called in JavaScript.
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virtual void AfterInit(v8::Isolate* isolate) {}
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// Bind the C++ class to the JS wrapper.
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// This method should only be called by classes using Constructor.
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virtual void InitWith(v8::Isolate* isolate, v8::Local<v8::Object> wrapper);
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// Helper to init with arguments.
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void InitWithArgs(gin::Arguments* args);
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v8::Global<v8::Object> wrapper_; // Weak
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private:
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static void FirstWeakCallback(
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const v8::WeakCallbackInfo<WrappableBase>& data);
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static void SecondWeakCallback(
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const v8::WeakCallbackInfo<WrappableBase>& data);
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v8::Isolate* isolate_ = nullptr;
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};
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} // namespace gin_helper
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#endif // SHELL_COMMON_GIN_HELPER_WRAPPABLE_BASE_H_
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