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// Copyright (c) 2012 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 CONTENT_PUBLIC_BROWSER_RENDER_VIEW_HOST_OBSERVER_H_
#define CONTENT_PUBLIC_BROWSER_RENDER_VIEW_HOST_OBSERVER_H_
#include "base/compiler_specific.h"
#include "ipc/ipc_listener.h"
#include "ipc/ipc_sender.h"
#include "content/common/content_export.h"
class GURL;
namespace content {
class RenderViewHost;
class RenderViewHostImpl;
// An observer API implemented by classes which want to filter IPC messages from
// RenderViewHost.
class CONTENT_EXPORT RenderViewHostObserver : public IPC::Listener,
public IPC::Sender {
public:
protected:
explicit RenderViewHostObserver(RenderViewHost* render_view_host);
virtual ~RenderViewHostObserver();
// Invoked after the RenderViewHost is created in the renderer process. After
// this point, messages can be sent to it (or to observers in the renderer).
virtual void RenderViewHostInitialized();
// Invoked when the RenderViewHost is being destroyed. Gives subclasses a
// chance to cleanup. The base implementation will delete the object.
// |render_view_host| is passed as an argument since render_view_host() will
// return NULL once this method enters.
virtual void RenderViewHostDestroyed(RenderViewHost* render_view_host);
// Notifies that a navigation is starting.
virtual void Navigate(const GURL& url);
// IPC::Listener implementation.
virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
// IPC::Sender implementation.
virtual bool Send(IPC::Message* message) OVERRIDE;
RenderViewHost* render_view_host() const;
int routing_id() { return routing_id_; }
private:
friend class RenderViewHostImpl;
// Invoked from RenderViewHost. Invokes RenderViewHostDestroyed and NULL out
// |render_view_host_|.
void RenderViewHostDestruction();
RenderViewHostImpl* render_view_host_;
// The routing ID of the associated RenderViewHost.
int routing_id_;
DISALLOW_COPY_AND_ASSIGN(RenderViewHostObserver);
};
} // namespace content
#endif // CONTENT_PUBLIC_BROWSER_RENDER_VIEW_HOST_OBSERVER_H_
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