chrome/browser/notifications/sync_notifier/notification_bitmap_fetcher.h

   1 // Copyright 2013 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_NOTIFICATIONS_SYNC_NOTIFIER_NOTIFICATION_BITMAP_FETCHER_H_
   6 #define CHROME_BROWSER_NOTIFICATIONS_SYNC_NOTIFIER_NOTIFICATION_BITMAP_FETCHER_H_
   7
   8 #include "base/memory/scoped_ptr.h"
   9 #include "chrome/browser/image_decoder.h"
  10 #include "net/url_request/url_fetcher_delegate.h"
  11 #include "third_party/skia/include/core/SkBitmap.h"
  12 #include "url/gurl.h"
  13
  14 namespace net {
  15 class URLFetcher;
  16 }  // namespace net
  17
  18 class Profile;
  19
  20 namespace notifier {
  21
  22 // A delegate interface for users of NotificationBitmapFetcher.
  23 class NotificationBitmapFetcherDelegate {
  24  public:
  25   // This will be called when the bitmap has been requested, whether or not the
  26   // request succeeds.  |url| is the URL that was originally fetched so we can
  27   // match up the bitmap with a specific request.
  28   virtual void OnFetchComplete(const GURL url, const SkBitmap* bitmap) = 0;
  29
  30  protected:
  31   virtual ~NotificationBitmapFetcherDelegate() {}
  32 };
  33
  34 class NotificationBitmapFetcher
  35     : public net::URLFetcherDelegate,
  36       public ImageDecoder::Delegate {
  37  public:
  38   NotificationBitmapFetcher(
  39       const GURL& url,
  40       NotificationBitmapFetcherDelegate* delegate);
  41   virtual ~NotificationBitmapFetcher();
  42
  43   GURL url() const { return url_; }
  44
  45   // Start fetching the URL with the fetcher.  The operation will be continued
  46   // in the OnURLFetchComplete callback.
  47   void Start(Profile* profile);
  48
  49   // Methods inherited from URLFetcherDelegate
  50
  51   // This will be called when the URL has been fetched, successfully or not.
  52   // Use accessor methods on |source| to get the results.
  53   virtual void OnURLFetchComplete(const net::URLFetcher* source) OVERRIDE;
  54
  55   // This will be called when some part of the response is read. |current|
  56   // denotes the number of bytes received up to the call, and |total| is the
  57   // expected total size of the response (or -1 if not determined).
  58   virtual void OnURLFetchDownloadProgress(const net::URLFetcher* source,
  59                                           int64 current, int64 total) OVERRIDE;
  60
  61   // Methods inherited from ImageDecoder::Delegate
  62
  63   // Called when image is decoded. |decoder| is used to identify the image in
  64   // case of decoding several images simultaneously.  This will not be called
  65   // on the UI thread.
  66   virtual void OnImageDecoded(const ImageDecoder* decoder,
  67                               const SkBitmap& decoded_image) OVERRIDE;
  68
  69   // Called when decoding image failed.
  70   virtual void OnDecodeImageFailed(const ImageDecoder* decoder) OVERRIDE;
  71
  72  private:
  73   scoped_ptr<net::URLFetcher> url_fetcher_;
  74   scoped_refptr<ImageDecoder> image_decoder_;
  75   const GURL url_;
  76   scoped_ptr<SkBitmap> bitmap_;
  77   NotificationBitmapFetcherDelegate* const delegate_;
  78
  79   DISALLOW_COPY_AND_ASSIGN(NotificationBitmapFetcher);
  80 };
  81
  82 }  // namespace notifier
  83
  84 #endif  // CHROME_BROWSER_NOTIFICATIONS_SYNC_NOTIFIER_NOTIFICATION_BITMAP_FETCHER_H_