#ifndef UNDO_HISTORY_H_
#define UNDO_HISTORY_H_
-#include "layer.h"
+#include "ring_buffer.h"
-#define CONTEXT_SIZE 32
+typedef void (*RevertAction)(void *context, size_t context_size);
typedef struct {
- char data[CONTEXT_SIZE];
-} Context;
+ RingBuffer actions;
+} UndoHistory;
-typedef void (*RevertAction)(void *layer, Context context);
+UndoHistory create_undo_history(void);
-typedef struct {
- void *layer;
- Context context;
- RevertAction revert;
-} Action;
-
-typedef struct UndoHistory UndoHistory;
+static inline
+void destroy_undo_history(UndoHistory undo_history)
+{
+ destroy_ring_buffer(undo_history.actions);
+}
-UndoHistory *create_undo_history(void);
-void destroy_undo_history(UndoHistory *undo_history);
-
-void undo_history_push(UndoHistory *undo_history, Action action);
+void undo_history_push(UndoHistory *undo_history,
+ RevertAction revert,
+ void *context_data,
+ size_t context_data_size);
void undo_history_pop(UndoHistory *undo_history);
+static inline
+int undo_history_empty(UndoHistory *undo_history)
+{
+ return undo_history->actions.count == 0;
+}
+
#endif // UNDO_HISTORY_H_