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