Python API: add methods for reordering constraints.

Order matters for constraints, but there was no way to change it.
The API follows other collections like idprops and node sockets.

1 files changed, 27 insertions, 0 deletions

diff --git a/source/blender/makesrna/intern/rna_pose.c b/source/blender/makesrna/intern/rna_pose.c
index 33d7d7d99cf..2f460e79ec9 100644
--- a/source/blender/makesrna/intern/rna_pose.c
+++ b/source/blender/makesrna/intern/rna_pose.c
@@ -601,6 +601,24 @@ static void rna_PoseChannel_constraints_remove(
   }
 }
 
+static void rna_PoseChannel_constraints_move(
+    ID *id, bPoseChannel *pchan, Main *bmain, ReportList *reports, int from, int to)
+{
+  Object *ob = (Object *)id;
+
+  if (from == to) {
+    return;
+  }
+
+  if (!BLI_listbase_move_index(&pchan->constraints, from, to)) {
+    BKE_reportf(reports, RPT_ERROR, "Could not move constraint from index '%d' to '%d'", from, to);
+    return;
+  }
+
+  ED_object_constraint_tag_update(bmain, ob, NULL);
+  WM_main_add_notifier(NC_OBJECT | ND_CONSTRAINT, ob);
+}
+
 bool rna_PoseChannel_constraints_override_apply(Main *UNUSED(bmain),
                                                 PointerRNA *ptr_dst,
                                                 PointerRNA *ptr_src,
@@ -929,6 +947,15 @@ static void rna_def_pose_channel_constraints(BlenderRNA *brna, PropertyRNA *cpro
   parm = RNA_def_pointer(func, "constraint", "Constraint", "", "Removed constraint");
   RNA_def_parameter_flags(parm, PROP_NEVER_NULL, PARM_REQUIRED | PARM_RNAPTR);
   RNA_def_parameter_clear_flags(parm, PROP_THICK_WRAP, 0);
+
+  func = RNA_def_function(srna, "move", "rna_PoseChannel_constraints_move");
+  RNA_def_function_ui_description(func, "Move a constraint to a different position");
+  RNA_def_function_flag(func, FUNC_USE_SELF_ID | FUNC_USE_MAIN | FUNC_USE_REPORTS);
+  parm = RNA_def_int(
+      func, "from_index", -1, INT_MIN, INT_MAX, "From Index", "Index to move", 0, 10000);
+  RNA_def_parameter_flags(parm, 0, PARM_REQUIRED);
+  parm = RNA_def_int(func, "to_index", -1, INT_MIN, INT_MAX, "To Index", "Target index", 0, 10000);
+  RNA_def_parameter_flags(parm, 0, PARM_REQUIRED);
 }
 
 static void rna_def_pose_channel(BlenderRNA *brna)