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