Browser side implementation of browser plugin

content/browser/browser_plugin/browser_plugin_web_contents_observer.h

+// 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_BROWSER_BROWSER_PLUGIN_BROWSER_PLUGIN_WEB_CONTENTS_OBSERVER_H__
+#define CONTENT_BROWSER_BROWSER_PLUGIN_BROWSER_PLUGIN_WEB_CONTENTS_OBSERVER_H__
+#pragma once
+
+#include "base/hash_tables.h"
+#include "content/browser/browser_plugin/renderer_host/browser_plugin_message_filter.h"
+#include "content/public/browser/notification_registrar.h"
+#include "content/public/browser/notification_observer.h"
+#include "content/public/browser/web_contents_observer.h"
+
+class BrowserPluginWebContentsObserver: public content::WebContentsObserver,
+                                        public content::NotificationObserver {
+ public:
+  typedef base::hash_set<content::WebContents*,
+                         hash_web_contents> GuestSet;
+  typedef base::hash_map<content::WebContents*,
+                         int64,
+                         hash_web_contents> GuestMap;
+
+  virtual ~BrowserPluginWebContentsObserver();
+
+  static BrowserPluginWebContentsObserver* Create(
+      content::WebContents* web_contents);
+
+  void AddGuest(content::WebContents* guest, int64 frame_id);
+
+  void RemoveGuest(content::WebContents* guest);
+
+  virtual void DidCommitProvisionalLoadForFrame(
+      int64 frame_id,
+      bool is_main_frame,
+      const GURL& url,
+      content::PageTransition transition_type) OVERRIDE;
+
+  virtual void RenderViewDeleted(
+      content::RenderViewHost* render_view_host) OVERRIDE;
+
+  virtual void RenderViewGone(base::TerminationStatus status) OVERRIDE;
+
+  virtual void WebContentsDestroyed(content::WebContents* tab) OVERRIDE;
+
+ private:
+  BrowserPluginWebContentsObserver(
+      content::WebContents* web_contents);
+
+  void DestroyGuests();
+
+  // content::NotificationObserver method override.
+  virtual void Observe(int type,
+                       const content::NotificationSource& source,
+                       const content::NotificationDetails& details) OVERRIDE;
+
+  // A scoped container for notification registries.
+  content::NotificationRegistrar registrar_;
+
+  GuestMap guests_;
+};
+
+#endif  // CONTENT_BROWSER_BROWSER_PLUGIN_BROWSER_PLUGIN_WEB_CONTENTS_OBSERVER_H_