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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef CHROME_BROWSER_UI_SAD_TAB_HELPER_H_
      6 #define CHROME_BROWSER_UI_SAD_TAB_HELPER_H_
      7 
      8 #include "base/basictypes.h"
      9 #include "base/compiler_specific.h"
     10 #include "base/memory/scoped_ptr.h"
     11 #include "content/public/browser/notification_observer.h"
     12 #include "content/public/browser/notification_registrar.h"
     13 #include "content/public/browser/web_contents_observer.h"
     14 #include "content/public/browser/web_contents_user_data.h"
     15 
     16 namespace chrome {
     17 class SadTab;
     18 }
     19 
     20 // Per-tab class to manage sad tab views.
     21 class SadTabHelper : public content::WebContentsObserver,
     22                      public content::NotificationObserver,
     23                      public content::WebContentsUserData<SadTabHelper> {
     24  public:
     25   virtual ~SadTabHelper();
     26 
     27   chrome::SadTab* sad_tab() { return sad_tab_.get(); }
     28 
     29  private:
     30   friend class content::WebContentsUserData<SadTabHelper>;
     31 
     32   explicit SadTabHelper(content::WebContents* web_contents);
     33 
     34   void InstallSadTab(base::TerminationStatus status);
     35 
     36   // Overridden from content::WebContentsObserver:
     37   virtual void RenderProcessGone(base::TerminationStatus status) OVERRIDE;
     38 
     39   // Overridden from content::NotificationObserver:
     40   virtual void Observe(int type,
     41                        const content::NotificationSource& source,
     42                        const content::NotificationDetails& details) OVERRIDE;
     43 
     44   // Used to get notifications about renderers coming and going.
     45   content::NotificationRegistrar registrar_;
     46 
     47   scoped_ptr<chrome::SadTab> sad_tab_;
     48 
     49   DISALLOW_COPY_AND_ASSIGN(SadTabHelper);
     50 };
     51 
     52 #endif  // CHROME_BROWSER_UI_SAD_TAB_HELPER_H_
     53