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.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   void Start(ui::DownloadFileObserver* observer) override;
  46   bool Wait() override;
  47   void Stop() override;
  48
  49  private:
  50   class DragDownloadFileUI;
  51   enum State {INITIALIZED, STARTED, SUCCESS, FAILURE};
  52
  53   ~DragDownloadFile() override;
  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_