| // Copyright 2013 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef ASH_ACCELERATORS_EXIT_WARNING_HANDLER_H_ |
| #define ASH_ACCELERATORS_EXIT_WARNING_HANDLER_H_ |
| |
| #include <memory> |
| |
| #include "ash/ash_export.h" |
| #include "base/macros.h" |
| #include "base/timer/timer.h" |
| #include "ui/base/accelerators/accelerator.h" |
| |
| namespace views { |
| class Widget; |
| } |
| |
| namespace ash { |
| |
| // In order to avoid accidental exits when the user presses the exit shortcut by |
| // mistake, we require that the user press it twice within a short period of |
| // time. During that time we show a popup informing the user of this. |
| // |
| // Notes: |
| // |
| // The corresponding accelerator must not be repeatable (see kRepeatableActions |
| // in accelerator_table.cc). Otherwise, the "Double Press Exit" will be |
| // activated just by holding it down, i.e. probably every time. |
| // |
| // State Transition Diagrams: |
| // |
| // IDLE |
| // | Press |
| // WAIT_FOR_DOUBLE_PRESS action: show ui & start timers |
| // | Press (before time limit ) |
| // EXITING action: hide ui, stop timer, exit |
| // |
| // IDLE |
| // | Press |
| // WAIT_FOR_DOUBLE_PRESS action: show ui & start timers |
| // | T timer expires |
| // IDLE action: hide ui |
| // |
| |
| class AcceleratorControllerTest; |
| |
| class ASH_EXPORT ExitWarningHandler { |
| public: |
| ExitWarningHandler(); |
| |
| ~ExitWarningHandler(); |
| |
| // Handles accelerator for exit (Ctrl-Shift-Q). |
| void HandleAccelerator(); |
| |
| private: |
| friend class AcceleratorControllerTest; |
| |
| enum State { IDLE, WAIT_FOR_DOUBLE_PRESS, EXITING }; |
| |
| // Performs actions when the time limit is exceeded. |
| void TimerAction(); |
| |
| void StartTimer(); |
| void CancelTimer(); |
| |
| void Show(); |
| void Hide(); |
| |
| State state_; |
| std::unique_ptr<views::Widget> widget_; |
| base::OneShotTimer timer_; |
| |
| // Flag to suppress starting the timer for testing. For test we call |
| // TimerAction() directly to simulate the expiration of the timer. |
| bool stub_timer_for_test_; |
| |
| DISALLOW_COPY_AND_ASSIGN(ExitWarningHandler); |
| }; |
| |
| } // namespace ash |
| |
| #endif // ASH_ACCELERATORS_EXIT_WARNING_HANDLER_H_ |