activation_tracker_win.h revision 010d83a9304c5a91596085d917d248abff47903a 
1// Copyright 2013 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 CHROME_BROWSER_UI_VIEWS_APP_LIST_WIN_ACTIVATION_TRACKER_WIN_H_
6#define CHROME_BROWSER_UI_VIEWS_APP_LIST_WIN_ACTIVATION_TRACKER_WIN_H_
7
8#include "base/macros.h"
9#include "base/timer/timer.h"
10#include "ui/app_list/views/app_list_view_observer.h"
11
12class AppListServiceWin;
13
14// Periodically checks to see if an AppListView has lost focus using a timer.
15class ActivationTrackerWin : public app_list::AppListViewObserver {
16 public:
17  explicit ActivationTrackerWin(AppListServiceWin* service);
18  ~ActivationTrackerWin();
19
20  // app_list::AppListViewObserver:
21  virtual void OnActivationChanged(views::Widget* widget, bool active) OVERRIDE;
22
23  void OnViewHidden();
24
25 private:
26  // Dismisses the app launcher if it has lost focus and the user is not trying
27  // to pin it.
28  void MaybeDismissAppList();
29
30  // Determines whether the app launcher should be dismissed. This should be
31  // called at most once per timer tick, as it is not idempotent (if the taskbar
32  // is focused, it waits until it has been called twice before dismissing the
33  // app list).
34  bool ShouldDismissAppList();
35
36  AppListServiceWin* service_;  // Weak. Owns this.
37
38  // Records whether, on the previous timer tick, the taskbar had focus without
39  // the right mouse button being down. We allow the taskbar to have focus for
40  // one tick before dismissing the app list. This allows the app list to be
41  // kept visible if the taskbar is seen briefly without the right mouse button
42  // down, but not if this happens for two consecutive ticks.
43  bool taskbar_has_focus_;
44
45  // Timer used to check if the taskbar or app list is active. Using a timer
46  // means we don't need to hook Windows, which is apparently not possible
47  // since Vista (and is not nice at any time).
48  base::RepeatingTimer<ActivationTrackerWin> timer_;
49
50  DISALLOW_COPY_AND_ASSIGN(ActivationTrackerWin);
51};
52
53#endif  // CHROME_BROWSER_UI_VIEWS_APP_LIST_WIN_ACTIVATION_TRACKER_WIN_H_
54