Support dragging a virtual file out of the browser.

chrome/browser/download/drag_download_file_win.h

+// Copyright (c) 2009 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_DOWNLOAD_DRAG_DOWNLOAD_FILE_WIN_H_
+#define CHROME_BROWSER_DOWNLOAD_DRAG_DOWNLOAD_FILE_WIN_H_
+
+#include "app/os_exchange_data.h"
+#include "base/file_path.h"
+#include "chrome/browser/download/download_manager.h"
+#include "googleurl/src/gurl.h"
+
+class TabContents;
+
+class DragDownloadFile : public OSExchangeData::DownloadFileProvider,
+                         public DownloadManager::Observer,
+                         public DownloadItem::Observer {
+ public:
+  DragDownloadFile(const GURL& url,
+                   const GURL& referrer,
+                   const std::string& referrer_encoding,
+                   TabContents* tab_contents);
+
+  // OSExchangeData::DownloadFileProvider methods.
+  // Called on drag-and-drop thread.
+  virtual bool Start(OSExchangeData::DownloadFileObserver* observer,
+                     int format);
+  virtual void Stop();
+
+  // DownloadManager::Observer methods.
+  // Called on UI thread.
+  virtual void ModelChanged();
+  virtual void SetDownloads(std::vector<DownloadItem*>& downloads);
+
+  // DownloadItem::Observer methods.
+  // Called on UI thread.
+  virtual void OnDownloadUpdated(DownloadItem* download);
+  virtual void OnDownloadFileCompleted(DownloadItem* download);
+  virtual void OnDownloadOpened(DownloadItem* download) { }
+
+ private:
+  // Called on drag-and-drop thread.
+  virtual ~DragDownloadFile();
+
+  bool InitiateDownload();
+  void InitiateDownloadSucceeded(
+      const std::vector<OSExchangeData::DownloadFileInfo*>& downloads);
+  void InitiateDownloadFailed();
+  void InitiateDownloadCompleted(bool result);
+
+  void DownloadCancelled();
+  void DownloadCompleted(const FilePath& file_path);
+
+  void StartNestedMessageLoop();
+  void QuitNestedMessageLoopIfNeeded();
+
+  // Called on UI thread.
+  void OnInitiateDownload(const FilePath& dir_path);
+  void CheckDownloadStatus(DownloadItem* download);
+
+  // Initialized on drag-and-drop thread. Can be accessed on either thread.
+  GURL url_;
+  GURL referrer_;
+  std::string referrer_encoding_;
+  TabContents* tab_contents_;
+  MessageLoop* drag_message_loop_;
+
+  // Accessed on drag-and-drop thread.
+  bool is_started_;
+  bool is_running_nested_message_loop_;
+  bool initiate_download_result_;
+  scoped_refptr<OSExchangeData::DownloadFileObserver> observer_;
+  int format_;
+  FilePath dir_path_;
+  FilePath file_path_;
+
+  // Access on UI thread.
+  DownloadManager* download_manager_;
+  bool download_item_observer_added_;
+
+  DISALLOW_COPY_AND_ASSIGN(DragDownloadFile);
+};
+
+#endif  // CHROME_BROWSER_DOWNLOAD_DRAG_DOWNLOAD_FILE_WIN_H_