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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_RENDERER_EXTERNAL_HOST_BINDINGS_H_
#define CHROME_RENDERER_EXTERNAL_HOST_BINDINGS_H_
#pragma once
#include "ipc/ipc_message.h"
#include "webkit/glue/cpp_bound_class.h"
// ExternalHostBindings is the class backing the "externalHost" object
// accessible from Javascript
//
// We expose one function, for sending a message to the external host:
// postMessage(String message[, String target]);
class ExternalHostBindings : public CppBoundClass {
public:
ExternalHostBindings(IPC::Message::Sender* sender, int routing_id);
virtual ~ExternalHostBindings();
// Invokes the registered onmessage handler.
// Returns true on successful invocation.
bool ForwardMessageFromExternalHost(const std::string& message,
const std::string& origin,
const std::string& target);
// Overridden to hold onto a pointer back to the web frame.
void BindToJavascript(WebKit::WebFrame* frame, const std::string& classname);
private:
// Creates an uninitialized instance of a MessageEvent object.
// This is equivalent to calling window.document.createEvent("MessageEvent")
// in javascript.
bool CreateMessageEvent(NPObject** message_event);
// The postMessage() function provided to Javascript.
void PostMessage(const CppArgumentList& args, CppVariant* result);
CppVariant on_message_handler_;
WebKit::WebFrame* frame_;
IPC::Message::Sender* sender_;
int routing_id_;
DISALLOW_COPY_AND_ASSIGN(ExternalHostBindings);
};
#endif // CHROME_RENDERER_EXTERNAL_HOST_BINDINGS_H_