chrome/browser/favicon/favicon_tab_helper.h

   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_FAVICON_FAVICON_TAB_HELPER_H_
   6 #define CHROME_BROWSER_FAVICON_FAVICON_TAB_HELPER_H_
   7
   8 #include <vector>
   9
  10 #include "base/basictypes.h"
  11 #include "base/callback.h"
  12 #include "components/favicon/core/browser/favicon_client.h"
  13 #include "components/favicon/core/favicon_driver.h"
  14 #include "content/public/browser/web_contents_observer.h"
  15 #include "content/public/browser/web_contents_user_data.h"
  16 #include "content/public/common/favicon_url.h"
  17
  18 namespace gfx {
  19 class Image;
  20 }
  21
  22 namespace content {
  23 struct FaviconStatus;
  24 }
  25
  26 class GURL;
  27 class FaviconHandler;
  28 class Profile;
  29 class SkBitmap;
  30
  31 // FaviconTabHelper works with FaviconHandlers to fetch the favicons.
  32 //
  33 // FetchFavicon fetches the given page's icons. It requests the icons from the
  34 // history backend. If the icon is not available or expired, the icon will be
  35 // downloaded and saved in the history backend.
  36 //
  37 class FaviconTabHelper : public content::WebContentsObserver,
  38                          public FaviconDriver,
  39                          public content::WebContentsUserData<FaviconTabHelper> {
  40  public:
  41   virtual ~FaviconTabHelper();
  42
  43   // Initiates loading the favicon for the specified url.
  44   void FetchFavicon(const GURL& url);
  45
  46   // Returns the favicon for this tab, or IDR_DEFAULT_FAVICON if the tab does
  47   // not have a favicon. The default implementation uses the current navigation
  48   // entry. This will return an empty bitmap if there are no navigation
  49   // entries, which should rarely happen.
  50   gfx::Image GetFavicon() const;
  51
  52   // Returns true if we have the favicon for the page.
  53   bool FaviconIsValid() const;
  54
  55   // Returns whether the favicon should be displayed. If this returns false, no
  56   // space is provided for the favicon, and the favicon is never displayed.
  57   virtual bool ShouldDisplayFavicon();
  58
  59   // Returns the current tab's favicon urls. If this is empty,
  60   // DidUpdateFaviconURL has not yet been called for the current navigation.
  61   const std::vector<content::FaviconURL>& favicon_urls() const {
  62     return favicon_urls_;
  63   }
  64
  65   // content::WebContentsObserver override. Must be public, because also
  66   // called from PrerenderContents.
  67   virtual void DidUpdateFaviconURL(
  68       const std::vector<content::FaviconURL>& candidates) override;
  69
  70   // Saves the favicon for the current page.
  71   void SaveFavicon();
  72
  73   // FaviconDriver methods.
  74   virtual int StartDownload(const GURL& url, int max_bitmap_size) override;
  75   virtual void NotifyFaviconUpdated(bool icon_url_changed) override;
  76   virtual bool IsOffTheRecord() override;
  77   virtual const gfx::Image GetActiveFaviconImage() override;
  78   virtual const GURL GetActiveFaviconURL() override;
  79   virtual bool GetActiveFaviconValidity() override;
  80   virtual const GURL GetActiveURL() override;
  81   virtual void SetActiveFaviconImage(gfx::Image image) override;
  82   virtual void SetActiveFaviconURL(GURL url) override;
  83   virtual void SetActiveFaviconValidity(bool validity) override;
  84
  85   // Favicon download callback.
  86   void DidDownloadFavicon(
  87       int id,
  88       int http_status_code,
  89       const GURL& image_url,
  90       const std::vector<SkBitmap>& bitmaps,
  91       const std::vector<gfx::Size>& original_bitmap_sizes);
  92
  93  private:
  94   explicit FaviconTabHelper(content::WebContents* web_contents);
  95   friend class content::WebContentsUserData<FaviconTabHelper>;
  96
  97   // content::WebContentsObserver overrides.
  98   virtual void DidStartNavigationToPendingEntry(
  99       const GURL& url,
 100       content::NavigationController::ReloadType reload_type) override;
 101   virtual void DidNavigateMainFrame(
 102       const content::LoadCommittedDetails& details,
 103       const content::FrameNavigateParams& params) override;
 104
 105   // Helper method that returns the active navigation entry's favicon.
 106   content::FaviconStatus& GetFaviconStatus();
 107
 108   Profile* profile_;
 109
 110   FaviconClient* client_;
 111
 112   std::vector<content::FaviconURL> favicon_urls_;
 113
 114   scoped_ptr<FaviconHandler> favicon_handler_;
 115
 116   // Handles downloading touchicons. It is NULL if
 117   // browser_defaults::kEnableTouchIcon is false.
 118   scoped_ptr<FaviconHandler> touch_icon_handler_;
 119
 120   DISALLOW_COPY_AND_ASSIGN(FaviconTabHelper);
 121 };
 122
 123 #endif  // CHROME_BROWSER_FAVICON_FAVICON_TAB_HELPER_H_