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// Copyright 2014 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 UI_BASE_ACCELERATORS_ACCELERATOR_HISTORY_H_
#define UI_BASE_ACCELERATORS_ACCELERATOR_HISTORY_H_
#include "base/memory/singleton.h"
#include "ui/base/accelerators/accelerator.h"
#include "ui/base/ui_base_export.h"
#include "ui/events/event.h"
#include "ui/events/event_handler.h"
namespace ui {
// Keeps track of the system-wide current and the most recent previous
// key accelerators.
class UI_BASE_EXPORT AcceleratorHistory {
public:
AcceleratorHistory();
~AcceleratorHistory();
// Returns the most recent recorded accelerator.
const Accelerator& current_accelerator() const {
return current_accelerator_;
}
// Returns the most recent previously recorded accelerator that is different
// than the current.
const Accelerator& previous_accelerator() const {
return previous_accelerator_;
}
// Stores the given |accelerator| only if it's different than the currently
// stored one.
void StoreCurrentAccelerator(const Accelerator& accelerator);
private:
Accelerator current_accelerator_;
Accelerator previous_accelerator_;
DISALLOW_COPY_AND_ASSIGN(AcceleratorHistory);
};
}; // namespace ui
#endif // UI_BASE_ACCELERATORS_ACCELERATOR_HISTORY_H_
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