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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 MOJO_SERVICES_PUBLIC_CPP_VIEW_MANAGER_VIEW_TRACKER_H_ |
| 6 #define MOJO_SERVICES_PUBLIC_CPP_VIEW_MANAGER_VIEW_TRACKER_H_ |
| 7 |
| 8 #include <set> |
| 9 |
| 10 #include "base/basictypes.h" |
| 11 #include "base/compiler_specific.h" |
| 12 #include "mojo/services/public/cpp/view_manager/view_observer.h" |
| 13 |
| 14 namespace mojo { |
| 15 |
| 16 class ViewTracker : public ViewObserver { |
| 17 public: |
| 18 using Views = std::set<View*>; |
| 19 |
| 20 ViewTracker(); |
| 21 ~ViewTracker() override; |
| 22 |
| 23 // Returns the set of views being observed. |
| 24 const std::set<View*>& views() const { return views_; } |
| 25 |
| 26 // Adds |view| to the set of Views being tracked. |
| 27 void Add(View* view); |
| 28 |
| 29 // Removes |view| from the set of views being tracked. |
| 30 void Remove(View* view); |
| 31 |
| 32 // Returns true if |view| was previously added and has not been removed or |
| 33 // deleted. |
| 34 bool Contains(View* view); |
| 35 |
| 36 // ViewObserver overrides: |
| 37 virtual void OnViewDestroying(View* view) override; |
| 38 |
| 39 private: |
| 40 Views views_; |
| 41 |
| 42 DISALLOW_COPY_AND_ASSIGN(ViewTracker); |
| 43 }; |
| 44 |
| 45 } // namespace mojo |
| 46 |
| 47 #endif // MOJO_SERVICES_PUBLIC_CPP_VIEW_MANAGER_VIEW_TRACKER_H_ |
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