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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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