chrome/browser/ui/browser_tab_contents.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_UI_BROWSER_TAB_CONTENTS_H_
   6 #define CHROME_BROWSER_UI_BROWSER_TAB_CONTENTS_H_
   7
   8 class Browser;
   9
  10 namespace content {
  11 class WebContents;
  12 }
  13
  14 namespace chrome {
  15 class BrowserTabStripModelDelegate;
  16 }
  17
  18 namespace prerender {
  19 class PrerenderContents;
  20 }
  21
  22 // A "tab contents" is a WebContents that is used as a tab in a browser
  23 // window, and thus is owned by a Browser's TabStripModel. The
  24 // BrowserTabContents class allows specific classes to attach the set of tab
  25 // helpers that is used for tab contents.
  26 //
  27 // TODO(avi): This list is rather large, and for most callers it's due to the
  28 // fact that they need tab helpers attached early to deal with arbitrary
  29 // content loaded into a WebContents that will later be added to the tabstrip.
  30 // Is there a better way to handle this? (Ideally, this list would contain
  31 // only Browser and BrowserTabStripModelDelegate.)
  32 class BrowserTabContents {
  33  private:
  34   // Browser and its TabStripModelDelegate have intimate control of tabs.
  35   // TabAndroid is the equivalent on Android.
  36   friend class Browser;
  37   friend class chrome::BrowserTabStripModelDelegate;
  38   friend class TabAndroid;
  39
  40   // chrome::Navigate creates WebContents that are destined for the tab strip,
  41   // and that might have WebUI that immediately calls back into random tab
  42   // helpers.
  43   friend class BrowserNavigatorWebContentsAdoption;
  44
  45   // ChromeFrame is defined as a complete tab of Chrome inside of an IE
  46   // window, so it need to have the full complement of tab helpers that it
  47   // would have if it were in a Browser.
  48   // TODO(avi): It's still probably a good idea for Chrome Frame to more
  49   // explicitly control which tab helpers get created for its WebContentses.
  50   // http://crbug.com/157590
  51   friend class ExternalTabContainerWin;
  52
  53   // Prerendering loads pages that have arbitrary external content; it needs
  54   // the full set of tab helpers to deal with it.
  55   friend class prerender::PrerenderContents;
  56
  57   // Adopts the specified WebContents as a full-fledged browser tab, attaching
  58   // all the associated tab helpers that are needed for the WebContents to
  59   // serve in that role. It is safe to call this on a WebContents that was
  60   // already adopted.
  61   static void AttachTabHelpers(content::WebContents* web_contents);
  62 };
  63
  64 #endif  // CHROME_BROWSER_UI_BROWSER_TAB_CONTENTS_H_