Kyle Isom
8c8e4e59a4
- Document `TestFrontend` for programmatic testing, including examples and usage details. - Add `UpdateBufferReference` to `UndoSystem` to support updating buffer associations.
50 lines
885 B
C++
50 lines
885 B
C++
#ifndef KTE_UNDOSYSTEM_H
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#define KTE_UNDOSYSTEM_H
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#include <string_view>
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#include "UndoTree.h"
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class Buffer;
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class UndoSystem {
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public:
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explicit UndoSystem(Buffer &owner, UndoTree &tree);
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void Begin(UndoType type);
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void Append(char ch);
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void Append(std::string_view text);
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void commit();
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void undo();
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void redo();
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void mark_saved();
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void discard_pending();
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void clear();
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void UpdateBufferReference(Buffer &new_buf);
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private:
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void apply(const UndoNode *node, int direction); // +1 redo, -1 undo
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void free_node(UndoNode *node);
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void free_branch(UndoNode *node); // frees redo siblings only
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UndoNode *find_parent(UndoNode *from, UndoNode *target);
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void update_dirty_flag();
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private:
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Buffer *buf_;
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UndoTree &tree_;
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// Internal hint for Delete batching: whether next Append() should prepend
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bool pending_prepend_ = false;
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};
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#endif // KTE_UNDOSYSTEM_H
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