src/game/level/level_editor/undo_history.c

   1 #include <stdlib.h>
   2 #include <stdio.h>
   3
   4 #include <SDL.h>
   5
   6 #include "system/nth_alloc.h"
   7 #include "system/lt.h"
   8 #include "system/stacktrace.h"
   9 #include "undo_history.h"
  10
  11 typedef struct {
  12     RevertAction revert;
  13 } HistoryAction;
  14
  15 void undo_history_push(UndoHistory *undo_history,
  16                        RevertAction revert,
  17                        void *context_data,
  18                        size_t context_data_size)
  19 {
  20     trace_assert(undo_history);
  21
  22     HistoryAction action = {
  23         .revert = revert,
  24     };
  25
  26     stack_push(&undo_history->actions, context_data, context_data_size);
  27     stack_push(&undo_history->actions, &action, sizeof(action));
  28 }
  29
  30 void undo_history_pop(UndoHistory *undo_history)
  31 {
  32     trace_assert(undo_history);
  33
  34     if (stack_empty(&undo_history->actions) > 0) {
  35         HistoryAction action = *(HistoryAction *)stack_top_element(&undo_history->actions);
  36         stack_pop(&undo_history->actions);
  37
  38         size_t context_size = stack_top_size(&undo_history->actions);
  39         void *context = stack_top_element(&undo_history->actions);
  40
  41         action.revert(context, context_size);
  42         stack_pop(&undo_history->actions);
  43     }
  44 }