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| 1 // Copyright 2014 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_HOST_ZOOM_LEVEL_CONTEXT_H_ |
| 6 #define CONTENT_BROWSER_HOST_ZOOM_LEVEL_CONTEXT_H_ |
| 7 |
| 8 #include "base/macros.h" |
| 9 #include "base/memory/ref_counted.h" |
| 10 #include "base/memory/scoped_ptr.h" |
| 11 #include "content/browser/host_zoom_map_impl.h" |
| 12 #include "content/public/browser/zoom_level_delegate.h" |
| 13 |
| 14 class PrefService; |
| 15 |
| 16 namespace content { |
| 17 struct HostZoomLevelContextDeleter; |
| 18 |
| 19 // This class manages a HostZoomMap and associates it with a ZoomLevelDelegate, |
| 20 // if one is provided. It also serves to keep the zoom level machinery details |
| 21 // separate from the owning StoragePartitionImpl. |
| 22 class HostZoomLevelContext |
| 23 : public base::RefCountedThreadSafe<HostZoomLevelContext, |
| 24 HostZoomLevelContextDeleter> { |
| 25 public: |
| 26 explicit HostZoomLevelContext( |
| 27 scoped_ptr<ZoomLevelDelegate> zoom_level_delegate); |
| 28 |
| 29 HostZoomMap* GetHostZoomMap() const { return host_zoom_map_impl_.get(); } |
| 30 ZoomLevelDelegate* GetZoomLevelDelegate() const { |
| 31 return zoom_level_delegate_.get(); |
| 32 } |
| 33 |
| 34 protected: |
| 35 virtual ~HostZoomLevelContext(); |
| 36 |
| 37 private: |
| 38 friend class base::DeleteHelper<HostZoomLevelContext>; |
| 39 friend class base::RefCountedThreadSafe<HostZoomLevelContext, |
| 40 HostZoomLevelContextDeleter>; |
| 41 friend struct HostZoomLevelContextDeleter; |
| 42 |
| 43 void DeleteOnCorrectThread() const; |
| 44 |
| 45 scoped_ptr<HostZoomMapImpl> host_zoom_map_impl_; |
| 46 // Release the delegate before the HostZoomMap, in case it is carrying |
| 47 // any HostZoomMap::Subscription pointers. |
| 48 scoped_ptr<ZoomLevelDelegate> zoom_level_delegate_; |
| 49 |
| 50 DISALLOW_COPY_AND_ASSIGN(HostZoomLevelContext); |
| 51 }; |
| 52 |
| 53 struct HostZoomLevelContextDeleter { |
| 54 static void Destruct(const HostZoomLevelContext* context) { |
| 55 context->DeleteOnCorrectThread(); |
| 56 } |
| 57 }; |
| 58 |
| 59 } // namespace content |
| 60 |
| 61 #endif // CONTENT_BROWSER_HOST_ZOOM_LEVEL_CONTEXT_H_ |
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