f430da1d45
This patch converts the undo stack from GTextDocument into GUndoStack, and GTextDocumentUndoCommand now inherits from GCommand. Let's turn this into a generic mechanism that can be used to implement undo/redo in any application. :^)
31 lines
743 B
C++
31 lines
743 B
C++
#pragma once
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#include <AK/NonnullOwnPtrVector.h>
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#include <LibGUI/GCommand.h>
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class GCommand;
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class GUndoStack {
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public:
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GUndoStack();
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~GUndoStack();
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void push(NonnullOwnPtr<GCommand>&&);
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bool can_undo() const { return m_stack_index < m_stack.size() && !m_stack.is_empty(); }
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bool can_redo() const { return m_stack_index > 0 && m_stack[m_stack_index - 1].m_undo_vector.size() > 0 && !m_stack.is_empty(); }
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void undo();
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void redo();
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void finalize_current_combo();
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private:
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struct UndoCommandsContainer {
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NonnullOwnPtrVector<GCommand> m_undo_vector;
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};
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NonnullOwnPtrVector<UndoCommandsContainer> m_stack;
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int m_stack_index { 0 };
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int m_last_updated_undo_vector_size { 0 };
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};
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