chrome/browser/ui/views/load_complete_listener.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 CHROME_BROWSER_UI_VIEWS_LOAD_COMPLETE_LISTENER_H_
#define CHROME_BROWSER_UI_VIEWS_LOAD_COMPLETE_LISTENER_H_

#include "base/compiler_specific.h"
#include "base/macros.h"
#include "content/public/browser/notification_observer.h"
#include "content/public/browser/notification_registrar.h"

// A class which takes  a delegate which can be notified after the first page
// load has been completed. This is particularly useful for triggering
// IO-intensive tasks which should not be run until start-up is complete.
class LoadCompleteListener : public content::NotificationObserver {
 public:
  class Delegate {
   public:
    // Invoked when initial page load has completed.
    virtual void OnLoadCompleted() = 0;

   protected:
    virtual ~Delegate() {}
  };

  explicit LoadCompleteListener(Delegate* delegate);

  ~LoadCompleteListener() override;

 private:
  // content::NotificationObserver:
  void Observe(int type,
               const content::NotificationSource& source,
               const content::NotificationDetails& details) override;

  content::NotificationRegistrar registrar_;

  // Delegate to be notified after the first page load has completed.
  Delegate* delegate_;

  DISALLOW_COPY_AND_ASSIGN(LoadCompleteListener);
};

#endif  // CHROME_BROWSER_UI_VIEWS_LOAD_COMPLETE_LISTENER_H_