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// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef ASH_ACCELERATORS_ACCELERATOR_SHIFT_DISABLE_CAPSLOCK_STATE_MACHINE_H_
#define ASH_ACCELERATORS_ACCELERATOR_SHIFT_DISABLE_CAPSLOCK_STATE_MACHINE_H_
#include "ash/ash_export.h"
#include "ui/events/event_handler.h"
#include "ui/ozone/public/input_controller.h"
namespace ash {
// Keeps rtack of when capslock is able to be disabled by the Shift release
// keyboard shortcut.
class ASH_EXPORT AcceleratorShiftDisableCapslockStateMachine
: public ui::EventHandler {
public:
enum class ShiftDisableState {
// Initial state waiting for shift to be pressed.
kStart,
// After shift was pressed, waiting for shift to be released to move to
// kTrigger.
kPrimed,
// Suppressing the accelerator from activating until all keys are released
// which causes us to go back to kStart.
kSuppress,
// When releasing the Shift key will be allowed to trigger the accelerator.
kTrigger
};
explicit AcceleratorShiftDisableCapslockStateMachine(
ui::InputController* input_controller);
AcceleratorShiftDisableCapslockStateMachine(
const AcceleratorShiftDisableCapslockStateMachine&) = delete;
AcceleratorShiftDisableCapslockStateMachine& operator=(
const AcceleratorShiftDisableCapslockStateMachine&) = delete;
~AcceleratorShiftDisableCapslockStateMachine() override;
// ui::EventHandler:
void OnKeyEvent(ui::KeyEvent* event) override;
void OnMouseEvent(ui::MouseEvent* event) override;
bool CanHandleCapsLock() const {
return current_state_ == ShiftDisableState::kTrigger;
}
ShiftDisableState current_state() const { return current_state_; }
private:
ShiftDisableState current_state_ = ShiftDisableState::kStart;
raw_ptr<ui::InputController> input_controller_;
};
} // namespace ash
#endif // ASH_ACCELERATORS_ACCELERATOR_SHIFT_DISABLE_CAPSLOCK_STATE_MACHINE_H_
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