[Cronet] Delay StartNetLog and StopNetLog until native request context is initialized
[chromium-blink-merge.git] / ui / gfx / display_change_notifier.h
blob041f0f7450b26335385c46f0d8bd28645487bce5
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.
5 #ifndef UI_GFX_DISPLAY_CHANGE_NOTIFIER_H_
6 #define UI_GFX_DISPLAY_CHANGE_NOTIFIER_H_
8 #include <vector>
10 #include "base/observer_list.h"
11 #include "ui/gfx/gfx_export.h"
13 namespace gfx {
15 class Display;
16 class DisplayObserver;
18 // DisplayChangeNotifier is a class implementing the handling of DisplayObserver
19 // notification for Screen.
20 class GFX_EXPORT DisplayChangeNotifier {
21 public:
22 DisplayChangeNotifier();
23 ~DisplayChangeNotifier();
25 void AddObserver(DisplayObserver* observer);
27 void RemoveObserver(DisplayObserver* observer);
29 void NotifyDisplaysChanged(const std::vector<Display>& old_displays,
30 const std::vector<Display>& new_displays);
32 private:
33 // The observers that need to be notified when a display is modified, added
34 // or removed.
35 ObserverList<DisplayObserver> observer_list_;
37 DISALLOW_COPY_AND_ASSIGN(DisplayChangeNotifier);
40 } // namespace gfx
42 #endif // UI_GFX_DISPLAY_CHANGE_NOTIFIER_H_