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      1 // Copyright 2013 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_DOWNLOAD_DOWNLOAD_UI_CONTROLLER_H_
      6 #define CHROME_BROWSER_DOWNLOAD_DOWNLOAD_UI_CONTROLLER_H_
      7 
      8 #include <set>
      9 
     10 #include "base/memory/scoped_ptr.h"
     11 #include "chrome/browser/download/all_download_item_notifier.h"
     12 
     13 class Profile;
     14 
     15 namespace content {
     16 class WebContents;
     17 }
     18 
     19 // This class handles the task of observing for download notifications and
     20 // notifying the UI when a new download should be displayed in the UI.
     21 //
     22 // This class monitors each IN_PROGRESS download that is created (for which
     23 // OnDownloadCreated is called) until:
     24 // - it is assigned a target path or
     25 // - is interrupted.
     26 // Then the NotifyDownloadStarting() method of the Delegate is invoked.
     27 class DownloadUIController : public AllDownloadItemNotifier::Observer {
     28  public:
     29   // The delegate is responsible for figuring out how to notify the UI.
     30   class Delegate {
     31    public:
     32     virtual ~Delegate();
     33     virtual void NotifyDownloadStarting(content::DownloadItem* item) = 0;
     34   };
     35 
     36   // |manager| is the download manager to observe for new downloads. If
     37   // |delegate.get()| is NULL, then the default delegate is constructed.
     38   //
     39   // On Android the default delegate notifies DownloadControllerAndroid. On
     40   // other platforms the target of the notification is a Browser object.
     41   //
     42   // Currently explicit delegates are only used for testing.
     43   DownloadUIController(content::DownloadManager* manager,
     44                        scoped_ptr<Delegate> delegate);
     45 
     46   virtual ~DownloadUIController();
     47 
     48  private:
     49   virtual void OnDownloadCreated(content::DownloadManager* manager,
     50                                  content::DownloadItem* item) OVERRIDE;
     51   virtual void OnDownloadUpdated(content::DownloadManager* manager,
     52                                  content::DownloadItem* item) OVERRIDE;
     53 
     54   AllDownloadItemNotifier download_notifier_;
     55 
     56   scoped_ptr<Delegate> delegate_;
     57 
     58   DISALLOW_COPY_AND_ASSIGN(DownloadUIController);
     59 };
     60 
     61 #endif  // CHROME_BROWSER_DOWNLOAD_DOWNLOAD_UI_CONTROLLER_H_
     62