UI: ShaderFx Drag and Drop, Layout Updates

This patch implements the list panel system D7490 for grease pencil
shader effects. It also moves their drawing to a callback in
ShaderFxTypeInfo in line with the extensible architecture refactoring
goal T75724.

The implementation is basically exactly the same as for the modifier
patch (9b099c86123fc82).

Thanks to Matias Mendiola (@mendio) for helping to develop the layout
changes.

Differential Revision: https://developer.blender.org/D7985

1 files changed, 4 insertions, 0 deletions

diff --git a/source/blender/editors/include/ED_object.h b/source/blender/editors/include/ED_object.h
index 0cc926987b2..73c58753531 100644
--- a/source/blender/editors/include/ED_object.h
+++ b/source/blender/editors/include/ED_object.h
@@ -453,6 +453,10 @@ int ED_object_shaderfx_move_down(struct ReportList *reports,
 int ED_object_shaderfx_move_up(struct ReportList *reports,
                                struct Object *ob,
                                struct ShaderFxData *fx);
+bool ED_object_shaderfx_move_to_index(struct ReportList *reports,
+                                      struct Object *ob,
+                                      struct ShaderFxData *fx,
+                                      const int index);
 
 /* object_select.c */
 void ED_object_select_linked_by_id(struct bContext *C, struct ID *id);