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| 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 SERVICES_VIEW_MANAGER_FOCUS_CONTROLLER_H_ | |
| 6 #define SERVICES_VIEW_MANAGER_FOCUS_CONTROLLER_H_ | |
| 7 | |
| 8 #include "base/memory/scoped_ptr.h" | |
| 9 #include "services/view_manager/server_view_drawn_tracker_observer.h" | |
| 10 | |
| 11 namespace view_manager { | |
| 12 | |
| 13 class FocusControllerDelegate; | |
| 14 class ServerView; | |
| 15 class ServerViewDrawnTracker; | |
| 16 | |
| 17 // Tracks a focused view. Focus is moved to another view when the drawn state | |
| 18 // of the focused view changes and the delegate is notified. | |
| 19 class FocusController : public ServerViewDrawnTrackerObserver { | |
| 20 public: | |
| 21 FocusController(FocusControllerDelegate* delegate, ServerView* root); | |
| 22 ~FocusController() override; | |
| 23 | |
| 24 // Sets the focused view. Does nothing if |view| is currently focused. This | |
| 25 // does not notify the delegate. | |
| 26 void SetFocusedView(ServerView* view); | |
| 27 ServerView* GetFocusedView(); | |
| 28 | |
| 29 private: | |
| 30 // Describes the source of the change. | |
| 31 enum ChangeSource { | |
| 32 CHANGE_SOURCE_EXPLICIT, | |
| 33 CHANGE_SOURCE_DRAWN_STATE_CHANGED, | |
| 34 }; | |
| 35 | |
| 36 // Implementation of SetFocusedView(). | |
| 37 void SetFocusedViewImpl(ServerView* view, ChangeSource change_source); | |
| 38 | |
| 39 // ServerViewDrawnTrackerObserver: | |
| 40 void OnDrawnStateChanged(ServerView* ancestor, | |
| 41 ServerView* view, | |
| 42 bool is_drawn) override; | |
| 43 | |
| 44 FocusControllerDelegate* delegate_; | |
| 45 ServerView* root_; | |
| 46 scoped_ptr<ServerViewDrawnTracker> drawn_tracker_; | |
| 47 | |
| 48 DISALLOW_COPY_AND_ASSIGN(FocusController); | |
| 49 }; | |
| 50 | |
| 51 } // namespace view_manager | |
| 52 | |
| 53 #endif // SERVICES_VIEW_MANAGER_FOCUS_CONTROLLER_H_ | |
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