ios/web/public/web_view_counter.h

   1 // Copyright 2015 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 IOS_WEB_PUBLIC_WEB_VIEW_COUNTER_H_
   6 #define IOS_WEB_PUBLIC_WEB_VIEW_COUNTER_H_
   7
   8 #include <stddef.h>
   9
  10 #include "base/macros.h"
  11
  12 namespace web {
  13
  14 class BrowserState;
  15
  16 // Maintains the count of web views associated with a particular BrowserState.
  17 // Must be used only from the UI thread.
  18 class WebViewCounter {
  19  public:
  20   // Returns the web::WebViewCounter for the given |browser_state|. Lazily
  21   // attaches one if it does not exist. |browser_state| cannot be null.
  22   static web::WebViewCounter* FromBrowserState(
  23       web::BrowserState* browser_state);
  24
  25   // Returns the count of WKWebViews associated with a BrowserState.
  26   virtual size_t GetWKWebViewCount() = 0;
  27
  28  protected:
  29   WebViewCounter() {};
  30   virtual ~WebViewCounter() {}
  31
  32  private:
  33   DISALLOW_COPY_AND_ASSIGN(WebViewCounter);
  34 };
  35
  36 }  // namespace web
  37
  38 #endif  // IOS_WEB_PUBLIC_WEB_VIEW_COUNTER_H_