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 CHROME_BROWSER_DOWNLOAD_DOWNLOAD_STATUS_UPDATER_H_
6#define CHROME_BROWSER_DOWNLOAD_DOWNLOAD_STATUS_UPDATER_H_
7
8#include <set>
9
10#include "base/basictypes.h"
11#include "chrome/browser/download/all_download_item_notifier.h"
12#include "content/public/browser/download_item.h"
13#include "content/public/browser/download_manager.h"
14
15// Keeps track of download progress for the entire browser.
16class DownloadStatusUpdater
17  : public AllDownloadItemNotifier::Observer {
18 public:
19  DownloadStatusUpdater();
20  virtual ~DownloadStatusUpdater();
21
22  // Fills in |*download_count| with the number of currently active downloads.
23  // If we know the final size of all downloads, this routine returns true
24  // with |*progress| set to the percentage complete of all in-progress
25  // downloads.  Otherwise, it returns false.
26  bool GetProgress(float* progress, int* download_count) const;
27
28  // Add the specified DownloadManager to the list of managers for which
29  // this object reports status.
30  // The manager must not have previously been added to this updater.
31  // The updater will automatically disassociate itself from the
32  // manager when the manager is shutdown.
33  void AddManager(content::DownloadManager* manager);
34
35  // AllDownloadItemNotifier::Observer
36  virtual void OnDownloadCreated(
37      content::DownloadManager* manager, content::DownloadItem* item) OVERRIDE;
38  virtual void OnDownloadUpdated(
39      content::DownloadManager* manager, content::DownloadItem* item) OVERRIDE;
40
41 protected:
42  // Platform-specific function to update the platform UI for download progress.
43  // |download| is the download item that changed. Implementations should not
44  // hold the value of |download| as it is not guaranteed to remain valid.
45  // Virtual to be overridable for testing.
46  virtual void UpdateAppIconDownloadProgress(content::DownloadItem* download);
47
48 private:
49  std::vector<AllDownloadItemNotifier*> notifiers_;
50
51  DISALLOW_COPY_AND_ASSIGN(DownloadStatusUpdater);
52};
53
54#endif  // CHROME_BROWSER_DOWNLOAD_DOWNLOAD_STATUS_UPDATER_H_
55