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      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 CONTENT_BROWSER_THEME_HELPER_MAC_H_
      6 #define CONTENT_BROWSER_THEME_HELPER_MAC_H_
      7 
      8 #include "base/memory/singleton.h"
      9 #include "content/public/browser/notification_observer.h"
     10 #include "content/public/browser/notification_registrar.h"
     11 #include "third_party/WebKit/public/web/mac/WebScrollbarTheme.h"
     12 
     13 namespace content {
     14 
     15 class ThemeHelperMac : public NotificationObserver {
     16  public:
     17   // Return pointer to the singleton instance for the current process, or NULL
     18   // if none.
     19   static ThemeHelperMac* GetInstance();
     20 
     21   // Returns the value of +[NSScroller preferredScrollStyle] as expressed
     22   // as the blink enum value.
     23   static blink::ScrollerStyle GetPreferredScrollerStyle();
     24 
     25   static void SendThemeChangeToAllRenderers(
     26       float initial_button_delay,
     27       float autoscroll_button_delay,
     28       bool jump_on_track_click,
     29       blink::ScrollerStyle preferred_scroller_style,
     30       bool redraw);
     31 
     32  private:
     33   friend struct DefaultSingletonTraits<ThemeHelperMac>;
     34 
     35   ThemeHelperMac();
     36   virtual ~ThemeHelperMac();
     37 
     38   // Overridden from NotificationObserver:
     39   virtual void Observe(int type,
     40                        const NotificationSource& source,
     41                        const NotificationDetails& details) OVERRIDE;
     42 
     43   NotificationRegistrar registrar_;
     44 
     45   DISALLOW_COPY_AND_ASSIGN(ThemeHelperMac);
     46 };
     47 
     48 }  // namespace content
     49 
     50 #endif  // CONTENT_BROWSER_THEME_HELPER_MAC_H_
     51