UI: Add AbstractViewItem base class

No user visible changes expected.

Similar to rBc355be6faeac, but for view items now instead of the view.
Not much of the item code is ported to use it yet, it's actually a bit
tricky for the most part. But just introducing the base class already
allows me to start unifying the view item buttons (`uiButTreeRow` and
`uiButGridTile`). This would be a nice improvement.

1 files changed, 22 insertions, 0 deletions

diff --git a/source/blender/editors/interface/abstract_view_item.cc b/source/blender/editors/interface/abstract_view_item.cc
new file mode 100644
index 00000000000..fc71dbe8b95
--- /dev/null
+++ b/source/blender/editors/interface/abstract_view_item.cc
@@ -0,0 +1,22 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+/** \file
+ * \ingroup edinterface
+ */
+
+#include "UI_abstract_view.hh"
+
+namespace blender::ui {
+
+/* ---------------------------------------------------------------------- */
+/** \name View Reconstruction
+ * \{ */
+
+void AbstractViewItem::update_from_old(const AbstractViewItem &old)
+{
+  is_active_ = old.is_active_;
+}
+
+/** \} */
+
+}  // namespace blender::ui