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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 CONTENT_BROWSER_DOWNLOAD_DRAG_DOWNLOAD_FILE_H_
      6 #define CONTENT_BROWSER_DOWNLOAD_DRAG_DOWNLOAD_FILE_H_
      7 
      8 #include "base/compiler_specific.h"
      9 #include "base/files/file.h"
     10 #include "base/files/file_path.h"
     11 #include "base/memory/scoped_ptr.h"
     12 #include "base/memory/weak_ptr.h"
     13 #include "base/run_loop.h"
     14 #include "content/browser/download/download_file.h"
     15 #include "content/common/content_export.h"
     16 #include "content/public/browser/download_item.h"
     17 #include "content/public/browser/download_manager.h"
     18 #include "content/public/common/referrer.h"
     19 #include "ui/base/dragdrop/download_file_interface.h"
     20 #include "url/gurl.h"
     21 
     22 namespace content {
     23 
     24 class DownloadManager;
     25 class WebContents;
     26 
     27 // This class implements downloading a file via dragging virtual files out of
     28 // the browser:
     29 // http://lists.whatwg.org/htdig.cgi/whatwg-whatwg.org/2009-August/022118.html
     30 // http://www.html5rocks.com/en/tutorials/casestudies/box_dnd_download/
     31 class CONTENT_EXPORT DragDownloadFile : public ui::DownloadFileProvider {
     32  public:
     33   // On Windows, we need to download into a temporary file. On posix, we need to
     34   // download into a file that has already been created, so only the UI
     35   // thread is involved. |file| must be null on windows but non-null on
     36   // posix systems. |file_path| is an absolute path on all systems.
     37   DragDownloadFile(const base::FilePath& file_path,
     38                    base::File file,
     39                    const GURL& url,
     40                    const Referrer& referrer,
     41                    const std::string& referrer_encoding,
     42                    WebContents* web_contents);
     43 
     44   // DownloadFileProvider methods.
     45   virtual void Start(ui::DownloadFileObserver* observer) OVERRIDE;
     46   virtual bool Wait() OVERRIDE;
     47   virtual void Stop() OVERRIDE;
     48 
     49  private:
     50   class DragDownloadFileUI;
     51   enum State {INITIALIZED, STARTED, SUCCESS, FAILURE};
     52 
     53   virtual ~DragDownloadFile();
     54 
     55   void DownloadCompleted(bool is_successful);
     56   void CheckThread();
     57 
     58   base::FilePath file_path_;
     59   base::File file_;
     60   base::MessageLoop* drag_message_loop_;
     61   State state_;
     62   scoped_refptr<ui::DownloadFileObserver> observer_;
     63   base::RunLoop nested_loop_;
     64   DragDownloadFileUI* drag_ui_;
     65   base::WeakPtrFactory<DragDownloadFile> weak_ptr_factory_;
     66 
     67   DISALLOW_COPY_AND_ASSIGN(DragDownloadFile);
     68 };
     69 
     70 }  // namespace content
     71 
     72 #endif  // CONTENT_BROWSER_DOWNLOAD_DRAG_DOWNLOAD_FILE_H_
     73