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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/NonnullOwnPtrVector.h>
#include <LibGUI/Forward.h>
namespace GUI {
class UndoStack {
public:
UndoStack();
~UndoStack();
void push(NonnullOwnPtr<Command>&&);
bool can_undo() const { return m_stack_index < m_stack.size() && !m_stack.is_empty(); }
bool can_redo() const { return m_stack_index > 0 && !m_stack.is_empty() && m_stack[m_stack_index - 1].commands.size() > 0; }
void undo();
void redo();
void finalize_current_combo();
void set_current_unmodified();
bool is_current_modified() const;
void clear();
private:
struct Combo {
NonnullOwnPtrVector<Command> commands;
};
NonnullOwnPtrVector<Combo> m_stack;
size_t m_stack_index { 0 };
Optional<size_t> m_clean_index;
};
}
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