content/browser/download/drag_download_file.h

   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_path.h"
  10 #include "base/memory/scoped_ptr.h"
  11 #include "base/memory/weak_ptr.h"
  12 #include "base/run_loop.h"
  13 #include "content/browser/download/download_file.h"
  14 #include "content/common/content_export.h"
  15 #include "content/public/browser/download_item.h"
  16 #include "content/public/browser/download_manager.h"
  17 #include "content/public/common/referrer.h"
  18 #include "net/base/file_stream.h"
  19 #include "ui/base/dragdrop/download_file_interface.h"
  20 #include "ui/base/ui_export.h"
  21 #include "url/gurl.h"
  22
  23 namespace net {
  24 class FileStream;
  25 }
  26
  27 namespace content {
  28
  29 class DownloadManager;
  30 class WebContents;
  31
  32 // This class implements downloading a file via dragging virtual files out of
  33 // the browser:
  34 // http://lists.whatwg.org/htdig.cgi/whatwg-whatwg.org/2009-August/022118.html
  35 // http://www.html5rocks.com/en/tutorials/casestudies/box_dnd_download/
  36 class CONTENT_EXPORT DragDownloadFile : public ui::DownloadFileProvider {
  37  public:
  38   // On Windows, we need to download into a temporary file. On posix, we need to
  39   // download into a file stream that has already been created, so only the UI
  40   // thread is involved. |file_stream| must be null on windows but non-null on
  41   // posix systems. |file_path| is an absolute path on all systems.
  42   DragDownloadFile(const base::FilePath& file_path,
  43                    scoped_ptr<net::FileStream> file_stream,
  44                    const GURL& url,
  45                    const Referrer& referrer,
  46                    const std::string& referrer_encoding,
  47                    WebContents* web_contents);
  48
  49   // DownloadFileProvider methods.
  50   virtual void Start(ui::DownloadFileObserver* observer) OVERRIDE;
  51   virtual bool Wait() OVERRIDE;
  52   virtual void Stop() OVERRIDE;
  53
  54  private:
  55   class DragDownloadFileUI;
  56   enum State {INITIALIZED, STARTED, SUCCESS, FAILURE};
  57
  58   virtual ~DragDownloadFile();
  59
  60   void DownloadCompleted(bool is_successful);
  61   void CheckThread();
  62
  63   base::FilePath file_path_;
  64   scoped_ptr<net::FileStream> file_stream_;
  65   base::MessageLoop* drag_message_loop_;
  66   State state_;
  67   scoped_refptr<ui::DownloadFileObserver> observer_;
  68   base::RunLoop nested_loop_;
  69   DragDownloadFileUI* drag_ui_;
  70   base::WeakPtrFactory<DragDownloadFile> weak_ptr_factory_;
  71
  72   DISALLOW_COPY_AND_ASSIGN(DragDownloadFile);
  73 };
  74
  75 }  // namespace content
  76
  77 #endif  // CONTENT_BROWSER_DOWNLOAD_DRAG_DOWNLOAD_FILE_H_