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 "dynarray.h"
   9 #include "system/stacktrace.h"
  10 #include "undo_history.h"
  11
  12 struct UndoHistory
  13 {
  14     Lt *lt;
  15     Dynarray *actions;
  16 };
  17
  18 UndoHistory *create_undo_history(void)
  19 {
  20     Lt *lt = create_lt();
  21
  22     UndoHistory *undo_history = PUSH_LT(
  23         lt,
  24         nth_calloc(1, sizeof(UndoHistory)),
  25         free);
  26     undo_history->lt = lt;
  27
  28     undo_history->actions = PUSH_LT(
  29         lt,
  30         create_dynarray(sizeof(Action)),
  31         destroy_dynarray);
  32
  33     return undo_history;
  34 }
  35
  36 void destroy_undo_history(UndoHistory *undo_history)
  37 {
  38     trace_assert(undo_history);
  39     RETURN_LT0(undo_history->lt);
  40 }
  41
  42 void undo_history_push(UndoHistory *undo_history, Action action)
  43 {
  44     trace_assert(undo_history);
  45     dynarray_push(undo_history->actions, &action);
  46 }
  47
  48 void undo_history_pop(UndoHistory *undo_history)
  49 {
  50     trace_assert(undo_history);
  51
  52     if (dynarray_count(undo_history->actions) > 0) {
  53         Action action;
  54         dynarray_pop(undo_history->actions, &action);
  55         action.revert(action.layer, action.context);
  56     }
  57 }