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// 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 "ash/ash_export.h"
#include "base/memory/scoped_ptr.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 the user press it twice within a
// period of time. During that time we show a popup informing the
// user of this.
//
// Notes:
//
// The corresponding accelerator must be non-repeatable (see
// kNonrepeatableActions 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_;
scoped_ptr<views::Widget> widget_;
base::OneShotTimer<ExitWarningHandler> 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_
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