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| 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 ASH_COMMON_ACCELERATORS_EXIT_WARNING_HANDLER_H_ | |
| 6 #define ASH_COMMON_ACCELERATORS_EXIT_WARNING_HANDLER_H_ | |
| 7 | |
| 8 #include <memory> | |
| 9 | |
| 10 #include "ash/ash_export.h" | |
| 11 #include "base/macros.h" | |
| 12 #include "base/timer/timer.h" | |
| 13 #include "ui/base/accelerators/accelerator.h" | |
| 14 | |
| 15 namespace views { | |
| 16 class Widget; | |
| 17 } | |
| 18 | |
| 19 namespace ash { | |
| 20 | |
| 21 // In order to avoid accidental exits when the user presses the exit shortcut by | |
| 22 // mistake, we require that the user press it twice within a short period of | |
| 23 // time. During that time we show a popup informing the user of this. | |
| 24 // | |
| 25 // Notes: | |
| 26 // | |
| 27 // The corresponding accelerator must not be repeatable (see kRepeatableActions | |
| 28 // in accelerator_table.cc). Otherwise, the "Double Press Exit" will be | |
| 29 // activated just by holding it down, i.e. probably every time. | |
| 30 // | |
| 31 // State Transition Diagrams: | |
| 32 // | |
| 33 // IDLE | |
| 34 // | Press | |
| 35 // WAIT_FOR_DOUBLE_PRESS action: show ui & start timers | |
| 36 // | Press (before time limit ) | |
| 37 // EXITING action: hide ui, stop timer, exit | |
| 38 // | |
| 39 // IDLE | |
| 40 // | Press | |
| 41 // WAIT_FOR_DOUBLE_PRESS action: show ui & start timers | |
| 42 // | T timer expires | |
| 43 // IDLE action: hide ui | |
| 44 // | |
| 45 | |
| 46 class AcceleratorControllerTest; | |
| 47 | |
| 48 class ASH_EXPORT ExitWarningHandler { | |
| 49 public: | |
| 50 ExitWarningHandler(); | |
| 51 | |
| 52 ~ExitWarningHandler(); | |
| 53 | |
| 54 // Handles accelerator for exit (Ctrl-Shift-Q). | |
| 55 void HandleAccelerator(); | |
| 56 | |
| 57 private: | |
| 58 friend class AcceleratorControllerTest; | |
| 59 | |
| 60 enum State { IDLE, WAIT_FOR_DOUBLE_PRESS, EXITING }; | |
| 61 | |
| 62 // Performs actions when the time limit is exceeded. | |
| 63 void TimerAction(); | |
| 64 | |
| 65 void StartTimer(); | |
| 66 void CancelTimer(); | |
| 67 | |
| 68 void Show(); | |
| 69 void Hide(); | |
| 70 | |
| 71 State state_; | |
| 72 std::unique_ptr<views::Widget> widget_; | |
| 73 base::OneShotTimer timer_; | |
| 74 | |
| 75 // Flag to suppress starting the timer for testing. For test we call | |
| 76 // TimerAction() directly to simulate the expiration of the timer. | |
| 77 bool stub_timer_for_test_; | |
| 78 | |
| 79 DISALLOW_COPY_AND_ASSIGN(ExitWarningHandler); | |
| 80 }; | |
| 81 | |
| 82 } // namespace ash | |
| 83 | |
| 84 #endif // ASH_COMMON_ACCELERATORS_EXIT_WARNING_HANDLER_H_ | |
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Chromium Code Reviews
Issue 2734683002:
chromeos: Move files in //ash/common to //ash, part 2 (Closed)
