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 <map>
+
+#include "content/public/browser/notification_registrar.h"
+#include "content/public/browser/notification_observer.h"
+#include "content/public/browser/web_contents_observer.h"
+#include "ui/gfx/size.h"
+
+class TabContents;
+
+namespace content {
+
+class BrowserPluginWebContentsObserver: public WebContentsObserver,
+                                        public NotificationObserver {
+ public:
+  BrowserPluginWebContentsObserver(TabContents* web_contents);
+
+  virtual ~BrowserPluginWebContentsObserver();
+
+  // A Host BrowserPluginWebContentsObserver keeps track of
+  // its guests so that if it navigates away, its associated RenderView
+  // crashes or it is hidden, it takes appropriate action on the guest.
+  void AddGuest(TabContents* guest, int64 frame_id);
+
+  void RemoveGuest(TabContents* guest);
+
+  TabContents* host() const { return host_; }
+
+  void set_host(TabContents* host) { host_ = host; }
+
+  int instance_id() const { return instance_id_; }
+
+  void set_instance_id(int instance_id) { instance_id_ = instance_id; }
+
+  // WebContentObserver implementation.
+
+  virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
+
+  virtual void DidCommitProvisionalLoadForFrame(
+      int64 frame_id,
+      bool is_main_frame,
+      const GURL& url,
+      PageTransition transition_type) OVERRIDE;
+
+  virtual void RenderViewDeleted(
+      RenderViewHost* render_view_host) OVERRIDE;
+
+  virtual void RenderViewGone(base::TerminationStatus status) OVERRIDE;
+
+  virtual void WebContentsDestroyed(WebContents* tab) OVERRIDE;
+
+ private:
+  typedef std::map<TabContents*, int64> GuestMap;
+
+  void OnOpenChannelToBrowserPlugin(int32 instance_id,
+                                    long long frame_id,
+                                    const std::string& src,
+                                    const gfx::Size& size);
+
+  void OnGuestReady();
+
+  void OnResizeGuest(int width, int height);
+
+  void OnRendererPluginChannelCreated(const IPC::ChannelHandle& handle);
+
+  void DestroyGuests();
+
+  // NotificationObserver method override.
+  virtual void Observe(int type,
+                       const NotificationSource& source,
+                       const NotificationDetails& details) OVERRIDE;
+
+  // A scoped container for notification registries.
+  NotificationRegistrar registrar_;
+
+  TabContents* host_;
+
+  // An identifier that uniquely identifies a browser plugin container
+  // within a host.
+  int instance_id_;
+
+  GuestMap guests_;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_BROWSER_PLUGIN_BROWSER_PLUGIN_WEB_CONTENTS_OBSERVER_H_