Assets: Disable snap-dragging for linking object assets

The location of a linked object isn't editable, or at least it will be reset
when reloading the file. So the drag & drop shouldn't even pretend like this
would work, so disable the snapping of the object and the bounding-box to show
the snapped object location while dragging.

2 files changed, 11 insertions, 0 deletions

diff --git a/source/blender/windowmanager/WM_api.h b/source/blender/windowmanager/WM_api.h
index f9bc309af9f..26db02be289 100644
--- a/source/blender/windowmanager/WM_api.h
+++ b/source/blender/windowmanager/WM_api.h
@@ -752,6 +752,7 @@ ListBase *WM_dropboxmap_find(const char *idname, int spaceid, int regionid);
 
 /* ID drag and drop */
 ID *WM_drag_asset_id_import(wmDragAsset *asset_drag, int flag_extra);
+bool WM_drag_asset_will_import_linked(const wmDrag *drag);
 void WM_drag_add_local_ID(struct wmDrag *drag, struct ID *id, struct ID *from_parent);
 struct ID *WM_drag_get_local_ID(const struct wmDrag *drag, short idcode);
 struct ID *WM_drag_get_local_ID_from_event(const struct wmEvent *event, short idcode);
diff --git a/source/blender/windowmanager/intern/wm_dragdrop.c b/source/blender/windowmanager/intern/wm_dragdrop.c
index 21f5925b037..638aca6c98e 100644
--- a/source/blender/windowmanager/intern/wm_dragdrop.c
+++ b/source/blender/windowmanager/intern/wm_dragdrop.c
@@ -577,6 +577,16 @@ ID *WM_drag_asset_id_import(wmDragAsset *asset_drag, const int flag_extra)
   return NULL;
 }
 
+bool WM_drag_asset_will_import_linked(const wmDrag *drag)
+{
+  if (drag->type != WM_DRAG_ASSET) {
+    return false;
+  }
+
+  const wmDragAsset *asset_drag = WM_drag_get_asset_data(drag, 0);
+  return asset_drag->import_type == FILE_ASSET_IMPORT_LINK;
+}
+
 /**
  * When dragging a local ID, return that. Otherwise, if dragging an asset-handle, link or append
  * that depending on what was chosen by the drag-box (currently append only in fact).