android_webview/browser/icon_helper.h

   1 // Copyright (c) 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 ANDROID_WEBVIEW_BROWSER_ICON_HELPER_H_
   6 #define ANDROID_WEBVIEW_BROWSER_ICON_HELPER_H_
   7
   8 #include <string>
   9 #include "base/containers/hash_tables.h"
  10 #include "content/public/browser/web_contents_observer.h"
  11 #include "url/gurl.h"
  12
  13 class SkBitmap;
  14
  15 namespace content {
  16 struct FaviconURL;
  17 }
  18
  19 namespace gfx {
  20 class Size;
  21 }
  22
  23 namespace android_webview {
  24
  25 // A helper that observes favicon changes for Webview.
  26 class IconHelper : public content::WebContentsObserver {
  27  public:
  28   class Listener {
  29    public:
  30     virtual bool ShouldDownloadFavicon(const GURL& icon_url) = 0;
  31     virtual void OnReceivedIcon(const GURL& icon_url,
  32                                 const SkBitmap& bitmap) = 0;
  33     virtual void OnReceivedTouchIconUrl(const std::string& url,
  34                                         const bool precomposed) = 0;
  35    protected:
  36     virtual ~Listener() {}
  37   };
  38
  39   explicit IconHelper(content::WebContents* web_contents);
  40   virtual ~IconHelper();
  41
  42   void SetListener(Listener* listener);
  43
  44   // From WebContentsObserver
  45   virtual void DidUpdateFaviconURL(
  46       const std::vector<content::FaviconURL>& candidates) OVERRIDE;
  47   virtual void DidStartNavigationToPendingEntry(
  48       const GURL& url,
  49       content::NavigationController::ReloadType reload_type) OVERRIDE;
  50
  51   void DownloadFaviconCallback(
  52       int id,
  53       int http_status_code,
  54       const GURL& image_url,
  55       const std::vector<SkBitmap>& bitmaps,
  56       const std::vector<gfx::Size>& original_bitmap_sizes);
  57
  58  private:
  59   void MarkUnableToDownloadFavicon(const GURL& icon_url);
  60   bool WasUnableToDownloadFavicon(const GURL& icon_url) const;
  61   void ClearUnableToDownloadFavicons();
  62
  63   Listener* listener_;
  64
  65   typedef uint32 MissingFaviconURLHash;
  66   base::hash_set<MissingFaviconURLHash> missing_favicon_urls_;
  67
  68   DISALLOW_COPY_AND_ASSIGN(IconHelper);
  69 };
  70
  71 }  // namespace android_webview
  72
  73 #endif  // ANDROID_WEBVIEW_BROWSER_ICON_HELPER_H_