Fire a notification in Windows 8 metro chrome which informs the user about a completed download. Th…

chrome/browser/download/download_completion_observer_win.h

+// Copyright (c) 2012 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_COMPLETION_OBSERVER_WIN_H_
+#define CHROME_BROWSER_DOWNLOAD_COMPLETION_OBSERVER_WIN_H_
+
+#include <set>
+
+#include "base/basictypes.h"
+#include "content/public/browser/download_item.h"
+#include "content/public/browser/download_manager.h"
+
+// Tracks download item completions and notifies any interested parties
+// (Windows 8 metro) about the same. On Windows 8 we display metro style
+// notifications when a download completes.
+class DownloadCompletionObserver
+    : public content::DownloadManager::Observer,
+      public content::DownloadItem::Observer {
+ public:
+  explicit DownloadCompletionObserver(content::DownloadManager* manager);
+  ~DownloadCompletionObserver();
+
+  // Methods inherited from content::DownloadManager::Observer.
+  virtual void OnDownloadCreated(
+      content::DownloadManager* manager, content::DownloadItem* download)
+      OVERRIDE;
+  virtual void ManagerGoingDown(content::DownloadManager* manager) OVERRIDE;
+
+  // Methods inherited from content::DownloadItem::Observer.
+  virtual void OnDownloadUpdated(content::DownloadItem* download) OVERRIDE;
+  virtual void OnDownloadOpened(content::DownloadItem* download) OVERRIDE {}
+
+ private:
+  void ClearDownloadItems();
+
+  std::set<content::DownloadItem*> download_items_;
+
+  DISALLOW_COPY_AND_ASSIGN(DownloadCompletionObserver);
+};
+
+#endif  // CHROME_BROWSER_DOWNLOAD_COMPLETION_OBSERVER_WIN_H_