Constraints: Add link and copy functions

Add functions to copy a single constraint between objects or between
bones, and another function to link constraints. This is in preparation
for constraint drag and drop in the outliner.

Differential Revision: https://developer.blender.org/D8642

2 files changed, 40 insertions, 0 deletions

diff --git a/source/blender/editors/include/ED_object.h b/source/blender/editors/include/ED_object.h
index 282df25172f..fcf18f306e1 100644
--- a/source/blender/editors/include/ED_object.h
+++ b/source/blender/editors/include/ED_object.h
@@ -346,6 +346,18 @@ void ED_object_constraint_dependency_tag_update(struct Main *bmain,
 bool ED_object_constraint_move_to_index(struct Object *ob,
                                         struct bConstraint *con,
                                         const int index);
+void ED_object_constraint_link(struct Main *bmain,
+                               struct Object *ob_dst,
+                               struct ListBase *dst,
+                               struct ListBase *src);
+void ED_object_constraint_copy_for_object(struct Main *bmain,
+                                          struct Object *ob_dst,
+                                          struct bConstraint *con);
+void ED_object_constraint_copy_for_pose(struct Main *bmain,
+                                        struct Object *ob_dst,
+                                        struct bPoseChannel *pchan,
+                                        struct bConstraint *con);
+
 /* object_modes.c */
 bool ED_object_mode_compat_test(const struct Object *ob, eObjectMode mode);
 bool ED_object_mode_compat_set(struct bContext *C,
diff --git a/source/blender/editors/object/object_constraint.c b/source/blender/editors/object/object_constraint.c
index f0a320e42cf..b062ae0c698 100644
--- a/source/blender/editors/object/object_constraint.c
+++ b/source/blender/editors/object/object_constraint.c
@@ -1436,6 +1436,34 @@ bool ED_object_constraint_move_to_index(Object *ob, bConstraint *con, const int
 
   return true;
 }
+
+void ED_object_constraint_link(Main *bmain, Object *ob_dst, ListBase *dst, ListBase *src)
+{
+  BKE_constraints_free(dst);
+  BKE_constraints_copy(dst, src, true);
+  LISTBASE_FOREACH (bConstraint *, con, dst) {
+    ED_object_constraint_dependency_tag_update(bmain, ob_dst, con);
+  }
+  WM_main_add_notifier(NC_OBJECT | ND_CONSTRAINT | NA_ADDED, NULL);
+}
+
+void ED_object_constraint_copy_for_object(Main *bmain, Object *ob_dst, bConstraint *con)
+{
+  BKE_constraint_copy_for_object(ob_dst, con);
+  ED_object_constraint_dependency_tag_update(bmain, ob_dst, con);
+  WM_main_add_notifier(NC_OBJECT | ND_CONSTRAINT | NA_ADDED, ob_dst);
+}
+
+void ED_object_constraint_copy_for_pose(Main *bmain,
+                                        Object *ob_dst,
+                                        bPoseChannel *pchan,
+                                        bConstraint *con)
+{
+  BKE_constraint_copy_for_pose(ob_dst, pchan, con);
+  ED_object_constraint_dependency_tag_update(bmain, ob_dst, con);
+  WM_main_add_notifier(NC_OBJECT | ND_CONSTRAINT | NA_ADDED, ob_dst);
+}
+
 /** \} */
 
 /* ------------------------------------------------------------------- */