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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2022, the SerenityOS developers.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Function.h>
#include <AK/Time.h>
#include <AK/Vector.h>
#include <LibGUI/Forward.h>
namespace GUI {
class UndoStack {
public:
UndoStack() = default;
~UndoStack() = default;
void push(NonnullOwnPtr<Command>);
ErrorOr<void> try_push(NonnullOwnPtr<Command>);
bool can_undo() const;
bool can_redo() const;
void undo();
void redo();
void set_current_unmodified();
bool is_current_modified() const;
Optional<Time> last_unmodified_timestamp() const { return m_last_unmodified_timestamp; }
void clear();
Optional<DeprecatedString> undo_action_text() const;
Optional<DeprecatedString> redo_action_text() const;
Function<void()> on_state_change;
private:
Vector<NonnullOwnPtr<Command>> m_stack;
size_t m_stack_index { 0 };
Optional<size_t> m_clean_index;
Optional<Time> m_last_unmodified_timestamp;
};
}
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