1 // Copyright 2017 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 ASH_LOGIN_UI_HOVER_NOTIFIER_H_
6 #define ASH_LOGIN_UI_HOVER_NOTIFIER_H_
7 
8 #include <string>
9 
10 #include "base/callback.h"
11 #include "ui/events/event_handler.h"
12 
13 namespace views {
14 class View;
15 }
16 
17 namespace ash {
18 
19 // Runs a callback whenever a view has gained or lost mouse hover.
20 // TODO(jdufault): see if we can replace this class with views::MouseWatcher.
21 class HoverNotifier : public ui::EventHandler {
22  public:
23   using OnHover = base::RepeatingCallback<void(bool has_hover)>;
24 
25   HoverNotifier(views::View* target_view, const OnHover& on_hover);
26   ~HoverNotifier() override;
27 
28   // ui::EventHandler:
29   void OnEvent(ui::Event* event) override;
30 
31  private:
32   bool had_hover_ = false;
33   views::View* target_view_ = nullptr;
34   OnHover on_hover_;
35 
36   DISALLOW_COPY_AND_ASSIGN(HoverNotifier);
37 };
38 
39 }  // namespace ash
40 
41 #endif  // ASH_LOGIN_UI_HOVER_NOTIFIER_H_
42