UI Code Quality: Convert Outliner Blender File mode to new tree buiding design

See https://developer.blender.org/D9499.

Also:
* Add `space_outliner/tree/common.cc` for functions shared between display
  modes.
* I had to add a cast to `ListBaseWrapper` to make it work with ID lists.
* Cleanup: Remove internal `Tree` alias for `ListBase`. That was more confusing
  than helpful.

1 files changed, 41 insertions, 0 deletions

diff --git a/source/blender/editors/space_outliner/tree/common.cc b/source/blender/editors/space_outliner/tree/common.cc
new file mode 100644
index 00000000000..56b5d62195e
--- /dev/null
+++ b/source/blender/editors/space_outliner/tree/common.cc
@@ -0,0 +1,41 @@
+/*
+ * 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 spoutliner
+ *
+ * Functions and helpers shared between tree-view types or other tree related code.
+ */
+
+#include "BKE_idtype.h"
+
+#include "RNA_access.h"
+
+#include "tree_view.hh"
+
+/* -------------------------------------------------------------------- */
+/** \name ID Helpers.
+ *
+ * \{ */
+
+const char *outliner_idcode_to_plural(short idcode)
+{
+  const char *propname = BKE_idtype_idcode_to_name_plural(idcode);
+  PropertyRNA *prop = RNA_struct_type_find_property(&RNA_BlendData, propname);
+  return (prop) ? RNA_property_ui_name(prop) : "UNKNOWN";
+}
+
+/** \} */