UI: Support defining UI lists in C

So far all UI lists had to be defined in Python, this makes it possible
to define them in C as well. Note that there is a whole bunch of special
handling for the Python API that isn't there for C. I think most
importantly custom properties support, which currently can't be added
for C defined UI lists.

The upcoming asset view UI template will use this, which needs to be
defined in C.

Adds a new file `interface_template_list.cc`, which at this point is
mostly a dummy to have a place for the `ED_uilisttypes_ui()` definition.
I plan a separate cleanup to move the UI-list template to that file.

4 files changed, 31 insertions, 0 deletions

diff --git a/source/blender/editors/include/UI_interface.h b/source/blender/editors/include/UI_interface.h
index 747ec776d80..020ca1f8f55 100644
--- a/source/blender/editors/include/UI_interface.h
+++ b/source/blender/editors/include/UI_interface.h
@@ -2558,6 +2558,7 @@ typedef struct uiDragColorHandle {
 
 void ED_operatortypes_ui(void);
 void ED_keymap_ui(struct wmKeyConfig *keyconf);
+void ED_uilisttypes_ui(void);
 
 void UI_drop_color_copy(struct wmDrag *drag, struct wmDropBox *drop);
 bool UI_drop_color_poll(struct bContext *C,
diff --git a/source/blender/editors/interface/CMakeLists.txt b/source/blender/editors/interface/CMakeLists.txt
index 2cc3830042c..29f868eebb0 100644
--- a/source/blender/editors/interface/CMakeLists.txt
+++ b/source/blender/editors/interface/CMakeLists.txt
@@ -66,6 +66,7 @@ set(SRC
   interface_region_tooltip.c
   interface_regions.c
   interface_style.c
+  interface_template_list.cc
   interface_template_search_menu.c
   interface_template_search_operator.c
   interface_templates.c
diff --git a/source/blender/editors/interface/interface_template_list.cc b/source/blender/editors/interface/interface_template_list.cc
new file mode 100644
index 00000000000..90980b3c963
--- /dev/null
+++ b/source/blender/editors/interface/interface_template_list.cc
@@ -0,0 +1,27 @@
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+/** \file
+ * \ingroup edinterface
+ *
+ * TODO: The UI list template implementation should be moved here.
+ */
+
+#include "UI_interface.h"
+
+void ED_uilisttypes_ui(void)
+{
+}
diff --git a/source/blender/editors/space_api/spacetypes.c b/source/blender/editors/space_api/spacetypes.c
index adb824b8934..b3b3eafb6e7 100644
--- a/source/blender/editors/space_api/spacetypes.c
+++ b/source/blender/editors/space_api/spacetypes.c
@@ -129,6 +129,8 @@ void ED_spacetypes_init(void)
 
   ED_screen_user_menu_register();
 
+  ED_uilisttypes_ui();
+
   /* Gizmo types. */
   ED_gizmotypes_button_2d();
   ED_gizmotypes_dial_3d();