Kyle Isom
464ad8d1ae
- Improve text input/event batching - Enhance debugging with optional instrumentation - Begin implementation of non-linear undo tree structure.
58 lines
1.1 KiB
C++
58 lines
1.1 KiB
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 <cstddef>
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#include <cstdint>
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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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// Debug helpers (compiled only when KTE_UNDO_DEBUG is defined)
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void debug_log(const char *op) const;
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static const char *type_str(UndoType t);
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static bool is_descendant(UndoNode *root, const UndoNode *target);
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void update_dirty_flag();
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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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