UI: Port view item features to base class, merge view item button types

No user visible changes expected.

Merges the tree row and grid tile button types, which were mostly doing
the same things. The idea is that there is a button type for
highlighting, as well as supporting general view item features (e.g.
renaming, drag/drop, etc.). So instead there is a view item button type
now. Also ports view item features like renaming, custom context menus,
drag controllers and drop controllers to `ui::AbstractViewItem` (the new
base class for all view items).

This should be quite an improvement because:
- Merges code that was duplicated over view items.
- Mentioned features (renaming, drag & drop, ...) are much easier to
  implement in new view types now. Most of it comes "for free".
- Further features will immediately become availalbe to all views (e.g.
  selection).
- Simplifies APIs, there don't have to be functions for individual view
  item types anymore.
- View item classes are split and thus less overwhelming visually.
- View item buttons now share all code (drawing, handling, etc.)
- We're soon running out of available button types, this commit merges
  two into one.

I was hoping I could do this in multiple smaller commits, but things
were quite intertwined so that would've taken quite some effort.

13 files changed, 535 insertions, 645 deletions

diff --git a/source/blender/editors/interface/abstract_view.cc b/source/blender/editors/interface/abstract_view.cc
index dea9600fde4..077c76a08f1 100644
--- a/source/blender/editors/interface/abstract_view.cc
+++ b/source/blender/editors/interface/abstract_view.cc
@@ -10,6 +10,13 @@
 
 namespace blender::ui {
 
+void AbstractView::register_item(AbstractViewItem &item)
+{
+  /* Actually modifies the item, not the view.  But for the public API it "feels" a bit nicer to
+   * have the view base class register the items, rather than setting the view on the item. */
+  item.view_ = this;
+}
+
 /* ---------------------------------------------------------------------- */
 /** \name View Reconstruction
  * \{ */
diff --git a/source/blender/editors/interface/abstract_view_item.cc b/source/blender/editors/interface/abstract_view_item.cc
index fc71dbe8b95..f73183d07e9 100644
--- a/source/blender/editors/interface/abstract_view_item.cc
+++ b/source/blender/editors/interface/abstract_view_item.cc
@@ -4,6 +4,16 @@
  * \ingroup edinterface
  */
 
+#include "BKE_context.h"
+
+#include "BLI_listbase.h"
+#include "BLI_string.h"
+
+#include "WM_api.h"
+
+#include "UI_interface.h"
+#include "interface_intern.h"
+
 #include "UI_abstract_view.hh"
 
 namespace blender::ui {
@@ -15,8 +25,349 @@ namespace blender::ui {
 void AbstractViewItem::update_from_old(const AbstractViewItem &old)
 {
   is_active_ = old.is_active_;
+  is_renaming_ = old.is_renaming_;
+}
+
+/** \} */
+
+/* ---------------------------------------------------------------------- */
+/** \name Renaming
+ * \{ */
+
+bool AbstractViewItem::supports_renaming() const
+{
+  /* No renaming by default. */
+  return false;
+}
+bool AbstractViewItem::rename(StringRefNull /*new_name*/)
+{
+  /* No renaming by default. */
+  return false;
+}
+
+StringRef AbstractViewItem::get_rename_string() const
+{
+  /* No rename string by default. */
+  return {};
+}
+
+bool AbstractViewItem::is_renaming() const
+{
+  return is_renaming_;
+}
+
+void AbstractViewItem::begin_renaming()
+{
+  AbstractView &view = get_view();
+  if (view.is_renaming() || !supports_renaming()) {
+    return;
+  }
+
+  if (view.begin_renaming()) {
+    is_renaming_ = true;
+  }
+
+  StringRef initial_str = get_rename_string();
+  std::copy(std::begin(initial_str), std::end(initial_str), std::begin(view.get_rename_buffer()));
+}
+
+void AbstractViewItem::rename_apply()
+{
+  const AbstractView &view = get_view();
+  rename(view.get_rename_buffer().data());
+  end_renaming();
+}
+
+void AbstractViewItem::end_renaming()
+{
+  if (!is_renaming()) {
+    return;
+  }
+
+  is_renaming_ = false;
+
+  AbstractView &view = get_view();
+  view.end_renaming();
+}
+
+static AbstractViewItem *find_item_from_rename_button(const uiBut &rename_but)
+{
+  /* A minimal sanity check, can't do much more here. */
+  BLI_assert(rename_but.type == UI_BTYPE_TEXT && rename_but.poin);
+
+  LISTBASE_FOREACH (uiBut *, but, &rename_but.block->buttons) {
+    if (but->type != UI_BTYPE_VIEW_ITEM) {
+      continue;
+    }
+
+    uiButViewItem *view_item_but = (uiButViewItem *)but;
+    AbstractViewItem *item = reinterpret_cast<AbstractViewItem *>(view_item_but->view_item);
+    const AbstractView &view = item->get_view();
+
+    if (item->is_renaming() && (view.get_rename_buffer().data() == rename_but.poin)) {
+      return item;
+    }
+  }
+
+  return nullptr;
+}
+
+static void rename_button_fn(bContext *UNUSED(C), void *arg, char *UNUSED(origstr))
+{
+  const uiBut *rename_but = static_cast<uiBut *>(arg);
+  AbstractViewItem *item = find_item_from_rename_button(*rename_but);
+  BLI_assert(item);
+  item->rename_apply();
+}
+
+void AbstractViewItem::add_rename_button(uiBlock &block)
+{
+  AbstractView &view = get_view();
+  uiBut *rename_but = uiDefBut(&block,
+                               UI_BTYPE_TEXT,
+                               1,
+                               "",
+                               0,
+                               0,
+                               UI_UNIT_X * 10,
+                               UI_UNIT_Y,
+                               view.get_rename_buffer().data(),
+                               1.0f,
+                               view.get_rename_buffer().size(),
+                               0,
+                               0,
+                               "");
+
+  /* Gotta be careful with what's passed to the `arg1` here. Any view data will be freed once the
+   * callback is executed. */
+  UI_but_func_rename_set(rename_but, rename_button_fn, rename_but);
+  UI_but_flag_disable(rename_but, UI_BUT_UNDO);
+
+  const bContext *evil_C = reinterpret_cast<bContext *>(block.evil_C);
+  ARegion *region = CTX_wm_region(evil_C);
+  /* Returns false if the button was removed. */
+  if (UI_but_active_only(evil_C, region, &block, rename_but) == false) {
+    end_renaming();
+  }
+}
+
+/** \} */
+
+/* ---------------------------------------------------------------------- */
+/** \name Context Menu
+ * \{ */
+
+void AbstractViewItem::build_context_menu(bContext & /*C*/, uiLayout & /*column*/) const
+{
+  /* No context menu by default. */
+}
+
+/** \} */
+
+/* ---------------------------------------------------------------------- */
+/** \name Drag 'n Drop
+ * \{ */
+
+std::unique_ptr<AbstractViewItemDragController> AbstractViewItem::create_drag_controller() const
+{
+  /* There's no drag controller (and hence no drag support) by default. */
+  return nullptr;
+}
+
+std::unique_ptr<AbstractViewItemDropController> AbstractViewItem::create_drop_controller() const
+{
+  /* There's no drop controller (and hence no drop support) by default. */
+  return nullptr;
+}
+
+AbstractViewItemDragController::AbstractViewItemDragController(AbstractView &view) : view_(view)
+{
+}
+
+void AbstractViewItemDragController::on_drag_start()
+{
+  /* Do nothing by default. */
+}
+
+AbstractViewItemDropController::AbstractViewItemDropController(AbstractView &view) : view_(view)
+{
+}
+
+/** \} */
+
+/* ---------------------------------------------------------------------- */
+/** \name General Getters & Setters
+ * \{ */
+
+AbstractView &AbstractViewItem::get_view() const
+{
+  if (UNLIKELY(!view_)) {
+    throw std::runtime_error(
+        "Invalid state, item must be registered through AbstractView::register_item()");
+  }
+  return *view_;
+}
+
+bool AbstractViewItem::is_active() const
+{
+  BLI_assert_msg(get_view().is_reconstructed(),
+                 "State can't be queried until reconstruction is completed");
+  return is_active_;
 }
 
 /** \} */
 
 }  // namespace blender::ui
+
+/* ---------------------------------------------------------------------- */
+/** \name C-API
+ * \{ */
+
+namespace blender::ui {
+
+/**
+ * Helper class to provide a higher level public (C-)API. Has access to private/protected view item
+ * members and ensures some invariants that way.
+ */
+class ViewItemAPIWrapper {
+ public:
+  static bool matches(const AbstractViewItem &a, const AbstractViewItem &b)
+  {
+    if (typeid(a) != typeid(b)) {
+      return false;
+    }
+    /* TODO should match the view as well. */
+    return a.matches(b);
+  }
+
+  static bool can_rename(const AbstractViewItem &item)
+  {
+    const AbstractView &view = item.get_view();
+    return !view.is_renaming() && item.supports_renaming();
+  }
+
+  static bool drag_start(bContext &C, const AbstractViewItem &item)
+  {
+    const std::unique_ptr<AbstractViewItemDragController> drag_controller =
+        item.create_drag_controller();
+    if (!drag_controller) {
+      return false;
+    }
+
+    WM_event_start_drag(&C,
+                        ICON_NONE,
+                        drag_controller->get_drag_type(),
+                        drag_controller->create_drag_data(),
+                        0,
+                        WM_DRAG_FREE_DATA);
+    drag_controller->on_drag_start();
+
+    return true;
+  }
+
+  static bool can_drop(const AbstractViewItem &item,
+                       const wmDrag &drag,
+                       const char **r_disabled_hint)
+  {
+    const std::unique_ptr<AbstractViewItemDropController> drop_controller =
+        item.create_drop_controller();
+    if (!drop_controller) {
+      return false;
+    }
+
+    return drop_controller->can_drop(drag, r_disabled_hint);
+  }
+
+  static std::string drop_tooltip(const AbstractViewItem &item, const wmDrag &drag)
+  {
+    const std::unique_ptr<AbstractViewItemDropController> drop_controller =
+        item.create_drop_controller();
+    if (!drop_controller) {
+      return {};
+    }
+
+    return drop_controller->drop_tooltip(drag);
+  }
+
+  static bool drop_handle(bContext &C, const AbstractViewItem &item, const ListBase &drags)
+  {
+    std::unique_ptr<AbstractViewItemDropController> drop_controller =
+        item.create_drop_controller();
+
+    const char *disabled_hint_dummy = nullptr;
+    LISTBASE_FOREACH (const wmDrag *, drag, &drags) {
+      if (drop_controller->can_drop(*drag, &disabled_hint_dummy)) {
+        return drop_controller->on_drop(&C, *drag);
+      }
+    }
+
+    return false;
+  }
+};
+
+}  // namespace blender::ui
+
+using namespace blender::ui;
+
+bool UI_view_item_is_active(const uiViewItemHandle *item_handle)
+{
+  const AbstractViewItem &item = reinterpret_cast<const AbstractViewItem &>(*item_handle);
+  return item.is_active();
+}
+
+bool UI_view_item_matches(const uiViewItemHandle *a_handle, const uiViewItemHandle *b_handle)
+{
+  const AbstractViewItem &a = reinterpret_cast<const AbstractViewItem &>(*a_handle);
+  const AbstractViewItem &b = reinterpret_cast<const AbstractViewItem &>(*b_handle);
+  return ViewItemAPIWrapper::matches(a, b);
+}
+
+bool UI_view_item_can_rename(const uiViewItemHandle *item_handle)
+{
+  const AbstractViewItem &item = reinterpret_cast<const AbstractViewItem &>(*item_handle);
+  return ViewItemAPIWrapper::can_rename(item);
+}
+
+void UI_view_item_begin_rename(uiViewItemHandle *item_handle)
+{
+  AbstractViewItem &item = reinterpret_cast<AbstractViewItem &>(*item_handle);
+  item.begin_renaming();
+}
+
+void UI_view_item_context_menu_build(bContext *C,
+                                     const uiViewItemHandle *item_handle,
+                                     uiLayout *column)
+{
+  const AbstractViewItem &item = reinterpret_cast<const AbstractViewItem &>(*item_handle);
+  item.build_context_menu(*C, *column);
+}
+
+bool UI_view_item_drag_start(bContext *C, const uiViewItemHandle *item_)
+{
+  const AbstractViewItem &item = reinterpret_cast<const AbstractViewItem &>(*item_);
+  return ViewItemAPIWrapper::drag_start(*C, item);
+}
+
+bool UI_view_item_can_drop(const uiViewItemHandle *item_,
+                           const wmDrag *drag,
+                           const char **r_disabled_hint)
+{
+  const AbstractViewItem &item = reinterpret_cast<const AbstractViewItem &>(*item_);
+  return ViewItemAPIWrapper::can_drop(item, *drag, r_disabled_hint);
+}
+
+char *UI_view_item_drop_tooltip(const uiViewItemHandle *item_, const wmDrag *drag)
+{
+  const AbstractViewItem &item = reinterpret_cast<const AbstractViewItem &>(*item_);
+
+  const std::string tooltip = ViewItemAPIWrapper::drop_tooltip(item, *drag);
+  return tooltip.empty() ? nullptr : BLI_strdup(tooltip.c_str());
+}
+
+bool UI_view_item_drop_handle(bContext *C, const uiViewItemHandle *item_, const ListBase *drags)
+{
+  const AbstractViewItem &item = reinterpret_cast<const AbstractViewItem &>(*item_);
+  return ViewItemAPIWrapper::drop_handle(*C, item, *drags);
+}
+
+/** \} */
diff --git a/source/blender/editors/interface/grid_view.cc b/source/blender/editors/interface/grid_view.cc
index 362642b0846..37fbb33f83b 100644
--- a/source/blender/editors/interface/grid_view.cc
+++ b/source/blender/editors/interface/grid_view.cc
@@ -95,18 +95,19 @@ AbstractGridViewItem::AbstractGridViewItem(StringRef identifier) : identifier_(i
 {
 }
 
-bool AbstractGridViewItem::matches(const AbstractGridViewItem &other) const
+bool AbstractGridViewItem::matches(const AbstractViewItem &other) const
 {
-  return identifier_ == other.identifier_;
+  const AbstractGridViewItem &other_grid_item = dynamic_cast<const AbstractGridViewItem &>(other);
+  return identifier_ == other_grid_item.identifier_;
 }
 
 void AbstractGridViewItem::grid_tile_click_fn(struct bContext * /*C*/,
                                               void *but_arg1,
                                               void * /*arg2*/)
 {
-  uiButGridTile *grid_tile_but = (uiButGridTile *)but_arg1;
+  uiButViewItem *view_item_but = (uiButViewItem *)but_arg1;
   AbstractGridViewItem &grid_item = reinterpret_cast<AbstractGridViewItem &>(
-      *grid_tile_but->view_item);
+      *view_item_but->view_item);
 
   grid_item.activate();
 }
@@ -114,8 +115,8 @@ void AbstractGridViewItem::grid_tile_click_fn(struct bContext * /*C*/,
 void AbstractGridViewItem::add_grid_tile_button(uiBlock &block)
 {
   const GridViewStyle &style = get_view().get_style();
-  grid_tile_but_ = (uiButGridTile *)uiDefBut(&block,
-                                             UI_BTYPE_GRID_TILE,
+  view_item_but_ = (uiButViewItem *)uiDefBut(&block,
+                                             UI_BTYPE_VIEW_ITEM,
                                              0,
                                              "",
                                              0,
@@ -129,15 +130,8 @@ void AbstractGridViewItem::add_grid_tile_button(uiBlock &block)
                                              0,
                                              "");
 
-  grid_tile_but_->view_item = reinterpret_cast<uiGridViewItemHandle *>(this);
-  UI_but_func_set(&grid_tile_but_->but, grid_tile_click_fn, grid_tile_but_, nullptr);
-}
-
-bool AbstractGridViewItem::is_active() const
-{
-  BLI_assert_msg(get_view().is_reconstructed(),
-                 "State can't be queried until reconstruction is completed");
-  return is_active_;
+  view_item_but_->view_item = reinterpret_cast<uiViewItemHandle *>(this);
+  UI_but_func_set(&view_item_but_->but, grid_tile_click_fn, view_item_but_, nullptr);
 }
 
 void AbstractGridViewItem::on_activate()
@@ -468,24 +462,3 @@ std::optional<bool> PreviewGridItem::should_be_active() const
 }
 
 }  // namespace blender::ui
-
-using namespace blender::ui;
-
-/* ---------------------------------------------------------------------- */
-/* C-API */
-
-using namespace blender::ui;
-
-bool UI_grid_view_item_is_active(const uiGridViewItemHandle *item_handle)
-{
-  const AbstractGridViewItem &item = reinterpret_cast<const AbstractGridViewItem &>(*item_handle);
-  return item.is_active();
-}
-
-bool UI_grid_view_item_matches(const uiGridViewItemHandle *a_handle,
-                               const uiGridViewItemHandle *b_handle)
-{
-  const AbstractGridViewItem &a = reinterpret_cast<const AbstractGridViewItem &>(*a_handle);
-  const AbstractGridViewItem &b = reinterpret_cast<const AbstractGridViewItem &>(*b_handle);
-  return a.matches(b);
-}
diff --git a/source/blender/editors/interface/interface.cc b/source/blender/editors/interface/interface.cc
index c0df193de87..2f9e69137ed 100644
--- a/source/blender/editors/interface/interface.cc
+++ b/source/blender/editors/interface/interface.cc
@@ -769,20 +769,11 @@ static bool ui_but_equals_old(const uiBut *but, const uiBut *oldbut)
     return false;
   }
 
-  if ((but->type == UI_BTYPE_TREEROW) && (oldbut->type == UI_BTYPE_TREEROW)) {
-    uiButTreeRow *but_treerow = (uiButTreeRow *)but;
-    uiButTreeRow *oldbut_treerow = (uiButTreeRow *)oldbut;
-    if (!but_treerow->tree_item || !oldbut_treerow->tree_item ||
-        !UI_tree_view_item_matches(but_treerow->tree_item, oldbut_treerow->tree_item)) {
-      return false;
-    }
-  }
-
-  if ((but->type == UI_BTYPE_GRID_TILE) && (oldbut->type == UI_BTYPE_GRID_TILE)) {
-    uiButGridTile *but_gridtile = (uiButGridTile *)but;
-    uiButGridTile *oldbut_gridtile = (uiButGridTile *)oldbut;
-    if (!but_gridtile->view_item || !oldbut_gridtile->view_item ||
-        !UI_grid_view_item_matches(but_gridtile->view_item, oldbut_gridtile->view_item)) {
+  if ((but->type == UI_BTYPE_VIEW_ITEM) && (oldbut->type == UI_BTYPE_VIEW_ITEM)) {
+    uiButViewItem *but_item = (uiButViewItem *)but;
+    uiButViewItem *oldbut_item = (uiButViewItem *)oldbut;
+    if (!but_item->view_item || !oldbut_item->view_item ||
+        !UI_view_item_matches(but_item->view_item, oldbut_item->view_item)) {
       return false;
     }
   }
@@ -907,16 +898,10 @@ static void ui_but_update_old_active_from_new(uiBut *oldbut, uiBut *but)
       progress_oldbut->progress = progress_but->progress;
       break;
     }
-    case UI_BTYPE_TREEROW: {
-      uiButTreeRow *treerow_oldbut = (uiButTreeRow *)oldbut;
-      uiButTreeRow *treerow_newbut = (uiButTreeRow *)but;
-      SWAP(uiTreeViewItemHandle *, treerow_newbut->tree_item, treerow_oldbut->tree_item);
-      break;
-    }
-    case UI_BTYPE_GRID_TILE: {
-      uiButGridTile *gridtile_oldbut = (uiButGridTile *)oldbut;
-      uiButGridTile *gridtile_newbut = (uiButGridTile *)but;
-      SWAP(uiGridViewItemHandle *, gridtile_newbut->view_item, gridtile_oldbut->view_item);
+    case UI_BTYPE_VIEW_ITEM: {
+      uiButViewItem *view_item_oldbut = (uiButViewItem *)oldbut;
+      uiButViewItem *view_item_newbut = (uiButViewItem *)but;
+      SWAP(uiViewItemHandle *, view_item_newbut->view_item, view_item_oldbut->view_item);
       break;
     }
     default:
@@ -1013,7 +998,7 @@ static bool ui_but_update_from_old_block(const bContext *C,
 
     /* Stupid special case: The active button may be inside (as in, overlapped on top) a view-item
      * button which we also want to keep highlighted then. */
-    if (ui_but_is_view_item(but)) {
+    if (but->type == UI_BTYPE_VIEW_ITEM) {
       flag_copy |= UI_ACTIVE;
     }
 
@@ -2245,21 +2230,12 @@ int ui_but_is_pushed_ex(uiBut *but, double *value)
           }
         }
         break;
-      case UI_BTYPE_TREEROW: {
-        uiButTreeRow *tree_row_but = (uiButTreeRow *)but;
-
-        is_push = -1;
-        if (tree_row_but->tree_item) {
-          is_push = UI_tree_view_item_is_active(tree_row_but->tree_item);
-        }
-        break;
-      }
-      case UI_BTYPE_GRID_TILE: {
-        uiButGridTile *grid_tile_but = (uiButGridTile *)but;
+      case UI_BTYPE_VIEW_ITEM: {
+        const uiButViewItem *view_item_but = (const uiButViewItem *)but;
 
         is_push = -1;
-        if (grid_tile_but->view_item) {
-          is_push = UI_grid_view_item_is_active(grid_tile_but->view_item);
+        if (view_item_but->view_item) {
+          is_push = UI_view_item_is_active(view_item_but->view_item);
         }
         break;
       }
@@ -4011,17 +3987,13 @@ static void ui_but_alloc_info(const eButType type,
       alloc_size = sizeof(uiButCurveProfile);
       alloc_str = "uiButCurveProfile";
       break;
-    case UI_BTYPE_TREEROW:
-      alloc_size = sizeof(uiButTreeRow);
-      alloc_str = "uiButTreeRow";
-      break;
     case UI_BTYPE_HOTKEY_EVENT:
       alloc_size = sizeof(uiButHotkeyEvent);
       alloc_str = "uiButHotkeyEvent";
       break;
-    case UI_BTYPE_GRID_TILE:
-      alloc_size = sizeof(uiButGridTile);
-      alloc_str = "uiButGridTile";
+    case UI_BTYPE_VIEW_ITEM:
+      alloc_size = sizeof(uiButViewItem);
+      alloc_str = "uiButViewItem";
       break;
     default:
       alloc_size = sizeof(uiBut);
@@ -4214,7 +4186,6 @@ static uiBut *ui_def_but(uiBlock *block,
                 UI_BTYPE_BLOCK,
                 UI_BTYPE_BUT_MENU,
                 UI_BTYPE_SEARCH_MENU,
-                UI_BTYPE_TREEROW,
                 UI_BTYPE_POPOVER)) {
     but->drawflag |= (UI_BUT_TEXT_LEFT | UI_BUT_ICON_LEFT);
   }
@@ -6469,15 +6440,6 @@ uiBut *uiDefSearchButO_ptr(uiBlock *block,
   return but;
 }
 
-void UI_but_treerow_indentation_set(uiBut *but, int indentation)
-{
-  uiButTreeRow *but_row = (uiButTreeRow *)but;
-  BLI_assert(but->type == UI_BTYPE_TREEROW);
-
-  but_row->indentation = indentation;
-  BLI_assert(indentation >= 0);
-}
-
 void UI_but_hint_drawstr_set(uiBut *but, const char *string)
 {
   ui_but_add_shortcut(but, string, false);
diff --git a/source/blender/editors/interface/interface_context_menu.c b/source/blender/editors/interface/interface_context_menu.c
index e58298cdaee..518fe65ee09 100644
--- a/source/blender/editors/interface/interface_context_menu.c
+++ b/source/blender/editors/interface/interface_context_menu.c
@@ -927,11 +927,11 @@ bool ui_popup_context_menu_for_button(bContext *C, uiBut *but, const wmEvent *ev
 
   {
     const ARegion *region = CTX_wm_menu(C) ? CTX_wm_menu(C) : CTX_wm_region(C);
-    uiButTreeRow *treerow_but = (uiButTreeRow *)ui_tree_row_find_mouse_over(region, event->xy);
-    if (treerow_but) {
-      BLI_assert(treerow_but->but.type == UI_BTYPE_TREEROW);
-      UI_tree_view_item_context_menu_build(
-          C, treerow_but->tree_item, uiLayoutColumn(layout, false));
+    uiButViewItem *view_item_but = (uiButViewItem *)ui_view_item_find_mouse_over(region,
+                                                                                 event->xy);
+    if (view_item_but) {
+      BLI_assert(view_item_but->but.type == UI_BTYPE_VIEW_ITEM);
+      UI_view_item_context_menu_build(C, view_item_but->view_item, uiLayoutColumn(layout, false));
       uiItemS(layout);
     }
   }
diff --git a/source/blender/editors/interface/interface_dropboxes.cc b/source/blender/editors/interface/interface_dropboxes.cc
index 9d3c1372b15..df488fb9127 100644
--- a/source/blender/editors/interface/interface_dropboxes.cc
+++ b/source/blender/editors/interface/interface_dropboxes.cc
@@ -22,15 +22,14 @@
 #include "UI_interface.h"
 
 /* -------------------------------------------------------------------- */
-/** \name Tree View Drag/Drop Callbacks
+/** \name View Drag/Drop Callbacks
  * \{ */
 
-static bool ui_tree_view_drop_poll(bContext *C, wmDrag *drag, const wmEvent *event)
+static bool ui_view_drop_poll(bContext *C, wmDrag *drag, const wmEvent *event)
 {
   const ARegion *region = CTX_wm_region(C);
-  const uiTreeViewItemHandle *hovered_tree_item = UI_block_tree_view_find_item_at(region,
-                                                                                  event->xy);
-  if (!hovered_tree_item) {
+  const uiViewItemHandle *hovered_item = UI_block_view_find_item_at(region, event->xy);
+  if (!hovered_item) {
     return false;
   }
 
@@ -39,21 +38,21 @@ static bool ui_tree_view_drop_poll(bContext *C, wmDrag *drag, const wmEvent *eve
   }
 
   drag->drop_state.free_disabled_info = false;
-  return UI_tree_view_item_can_drop(hovered_tree_item, drag, &drag->drop_state.disabled_info);
+  return UI_view_item_can_drop(hovered_item, drag, &drag->drop_state.disabled_info);
 }
 
-static char *ui_tree_view_drop_tooltip(bContext *C,
-                                       wmDrag *drag,
-                                       const int xy[2],
-                                       wmDropBox *UNUSED(drop))
+static char *ui_view_drop_tooltip(bContext *C,
+                                  wmDrag *drag,
+                                  const int xy[2],
+                                  wmDropBox *UNUSED(drop))
 {
   const ARegion *region = CTX_wm_region(C);
-  const uiTreeViewItemHandle *hovered_tree_item = UI_block_tree_view_find_item_at(region, xy);
-  if (!hovered_tree_item) {
+  const uiViewItemHandle *hovered_item = UI_block_view_find_item_at(region, xy);
+  if (!hovered_item) {
     return nullptr;
   }
 
-  return UI_tree_view_item_drop_tooltip(hovered_tree_item, drag);
+  return UI_view_item_drop_tooltip(hovered_item, drag);
 }
 
 /** \} */
@@ -140,12 +139,7 @@ void ED_dropboxes_ui()
 {
   ListBase *lb = WM_dropboxmap_find("User Interface", SPACE_EMPTY, 0);
 
-  WM_dropbox_add(lb,
-                 "UI_OT_tree_view_drop",
-                 ui_tree_view_drop_poll,
-                 nullptr,
-                 nullptr,
-                 ui_tree_view_drop_tooltip);
+  WM_dropbox_add(lb, "UI_OT_view_drop", ui_view_drop_poll, nullptr, nullptr, ui_view_drop_tooltip);
   WM_dropbox_add(lb,
                  "UI_OT_drop_name",
                  ui_drop_name_poll,
diff --git a/source/blender/editors/interface/interface_handlers.c b/source/blender/editors/interface/interface_handlers.c
index 2496136883d..0a50522a141 100644
--- a/source/blender/editors/interface/interface_handlers.c
+++ b/source/blender/editors/interface/interface_handlers.c
@@ -1151,7 +1151,10 @@ static void ui_apply_but_ROW(bContext *C, uiBlock *block, uiBut *but, uiHandleBu
   data->applied = true;
 }
 
-static void ui_apply_but_TREEROW(bContext *C, uiBlock *block, uiBut *but, uiHandleButtonData *data)
+static void ui_apply_but_VIEW_ITEM(bContext *C,
+                                   uiBlock *block,
+                                   uiBut *but,
+                                   uiHandleButtonData *data)
 {
   if (data->apply_through_extra_icon) {
     /* Don't apply this, it would cause unintended tree-row toggling when clicking on extra icons.
@@ -2128,10 +2131,10 @@ static bool ui_but_drag_init(bContext *C,
         return false;
       }
     }
-    else if (but->type == UI_BTYPE_TREEROW) {
-      uiButTreeRow *tree_row_but = (uiButTreeRow *)but;
-      if (tree_row_but->tree_item) {
-        UI_tree_view_item_drag_start(C, tree_row_but->tree_item);
+    else if (but->type == UI_BTYPE_VIEW_ITEM) {
+      const uiButViewItem *view_item_but = (uiButViewItem *)but;
+      if (view_item_but->view_item) {
+        UI_view_item_drag_start(C, view_item_but->view_item);
       }
     }
     else {
@@ -2289,11 +2292,8 @@ static void ui_apply_but(
     case UI_BTYPE_ROW:
       ui_apply_but_ROW(C, block, but, data);
       break;
-    case UI_BTYPE_GRID_TILE:
-      ui_apply_but_ROW(C, block, but, data);
-      break;
-    case UI_BTYPE_TREEROW:
-      ui_apply_but_TREEROW(C, block, but, data);
+    case UI_BTYPE_VIEW_ITEM:
+      ui_apply_but_VIEW_ITEM(C, block, but, data);
       break;
     case UI_BTYPE_LISTROW:
       ui_apply_but_LISTROW(C, block, but, data);
@@ -4764,53 +4764,13 @@ static int ui_do_but_TOG(bContext *C, uiBut *but, uiHandleButtonData *data, cons
   return WM_UI_HANDLER_CONTINUE;
 }
 
-static int ui_do_but_TREEROW(bContext *C,
-                             uiBut *but,
-                             uiHandleButtonData *data,
-                             const wmEvent *event)
-{
-  uiButTreeRow *tree_row_but = (uiButTreeRow *)but;
-  BLI_assert(tree_row_but->but.type == UI_BTYPE_TREEROW);
-
-  if (data->state == BUTTON_STATE_HIGHLIGHT) {
-    if (event->type == LEFTMOUSE) {
-      switch (event->val) {
-        case KM_PRESS:
-          /* Extra icons have priority, don't mess with them. */
-          if (ui_but_extra_operator_icon_mouse_over_get(but, data->region, event)) {
-            return WM_UI_HANDLER_BREAK;
-          }
-          button_activate_state(C, but, BUTTON_STATE_WAIT_DRAG);
-          data->dragstartx = event->xy[0];
-          data->dragstarty = event->xy[1];
-          return WM_UI_HANDLER_CONTINUE;
-
-        case KM_CLICK:
-          button_activate_state(C, but, BUTTON_STATE_EXIT);
-          return WM_UI_HANDLER_BREAK;
-
-        case KM_DBL_CLICK:
-          data->cancel = true;
-          UI_tree_view_item_begin_rename(tree_row_but->tree_item);
-          ED_region_tag_redraw(CTX_wm_region(C));
-          return WM_UI_HANDLER_BREAK;
-      }
-    }
-  }
-  else if (data->state == BUTTON_STATE_WAIT_DRAG) {
-    /* Let "default" button handling take care of the drag logic. */
-    return ui_do_but_EXIT(C, but, data, event);
-  }
-
-  return WM_UI_HANDLER_CONTINUE;
-}
-
-static int ui_do_but_GRIDTILE(bContext *C,
-                              uiBut *but,
-                              uiHandleButtonData *data,
-                              const wmEvent *event)
+static int ui_do_but_VIEW_ITEM(bContext *C,
+                               uiBut *but,
+                               uiHandleButtonData *data,
+                               const wmEvent *event)
 {
-  BLI_assert(but->type == UI_BTYPE_GRID_TILE);
+  uiButViewItem *view_item_but = (uiButViewItem *)but;
+  BLI_assert(view_item_but->but.type == UI_BTYPE_VIEW_ITEM);
 
   if (data->state == BUTTON_STATE_HIGHLIGHT) {
     if (event->type == LEFTMOUSE) {
@@ -4831,8 +4791,7 @@ static int ui_do_but_GRIDTILE(bContext *C,
 
         case KM_DBL_CLICK:
           data->cancel = true;
-          // uiButGridTile *grid_tile_but = (uiButGridTile *)but;
-          // UI_tree_view_item_begin_rename(grid_tile_but->tree_item);
+          UI_view_item_begin_rename(view_item_but->view_item);
           ED_region_tag_redraw(CTX_wm_region(C));
           return WM_UI_HANDLER_BREAK;
       }
@@ -7980,7 +7939,7 @@ static int ui_do_button(bContext *C, uiBlock *block, uiBut *but, const wmEvent *
        * to spawn the context menu should also activate the item. This makes it clear which item
        * will be operated on.
        * Apply the button immediately, so context menu polls get the right active item. */
-      if (ELEM(but->type, UI_BTYPE_TREEROW)) {
+      if (ELEM(but->type, UI_BTYPE_VIEW_ITEM)) {
         ui_apply_but(C, but->block, but, but->active, true);
       }
 
@@ -8045,11 +8004,8 @@ static int ui_do_button(bContext *C, uiBlock *block, uiBut *but, const wmEvent *
     case UI_BTYPE_ROW:
       retval = ui_do_but_TOG(C, but, data, event);
       break;
-    case UI_BTYPE_GRID_TILE:
-      retval = ui_do_but_GRIDTILE(C, but, data, event);
-      break;
-    case UI_BTYPE_TREEROW:
-      retval = ui_do_but_TREEROW(C, but, data, event);
+    case UI_BTYPE_VIEW_ITEM:
+      retval = ui_do_but_VIEW_ITEM(C, but, data, event);
       break;
     case UI_BTYPE_SCROLL:
       retval = ui_do_but_SCROLL(C, block, but, data, event);
@@ -9725,7 +9681,7 @@ static int ui_handle_view_items_hover(const wmEvent *event, const ARegion *regio
     }
 
     LISTBASE_FOREACH (uiBut *, but, &block->buttons) {
-      if (ui_but_is_view_item(but)) {
+      if (but->type == UI_BTYPE_VIEW_ITEM) {
         but->flag &= ~UI_ACTIVE;
         has_view_item = true;
       }
@@ -9752,7 +9708,7 @@ static int ui_handle_view_item_event(bContext *C,
                                      ARegion *region,
                                      uiBut *view_but)
 {
-  BLI_assert(ui_but_is_view_item(view_but));
+  BLI_assert(view_but->type == UI_BTYPE_VIEW_ITEM);
   if (event->type == LEFTMOUSE) {
     /* Will free active button if there already is one. */
     ui_handle_button_activate(C, region, view_but, BUTTON_ACTIVATE_OVER);
diff --git a/source/blender/editors/interface/interface_intern.h b/source/blender/editors/interface/interface_intern.h
index 5e0382f73a9..03b9d03a6e3 100644
--- a/source/blender/editors/interface/interface_intern.h
+++ b/source/blender/editors/interface/interface_intern.h
@@ -343,20 +343,12 @@ typedef struct uiButProgressbar {
   float progress;
 } uiButProgressbar;
 
-/** Derived struct for #UI_BTYPE_TREEROW. */
-typedef struct uiButTreeRow {
+typedef struct uiButViewItem {
   uiBut but;
 
-  uiTreeViewItemHandle *tree_item;
-  int indentation;
-} uiButTreeRow;
-
-/** Derived struct for #UI_BTYPE_GRID_TILE. */
-typedef struct uiButGridTile {
-  uiBut but;
-
-  uiGridViewItemHandle *view_item;
-} uiButGridTile;
+  /* C-Handle to the view item this button was created for. */
+  uiViewItemHandle *view_item;
+} uiButViewItem;
 
 /** Derived struct for #UI_BTYPE_HSVCUBE. */
 typedef struct uiButHSVCube {
@@ -1372,7 +1364,6 @@ void ui_but_anim_decorate_update_from_flag(uiButDecorator *but);
 bool ui_but_is_editable(const uiBut *but) ATTR_WARN_UNUSED_RESULT;
 bool ui_but_is_editable_as_text(const uiBut *but) ATTR_WARN_UNUSED_RESULT;
 bool ui_but_is_toggle(const uiBut *but) ATTR_WARN_UNUSED_RESULT;
-bool ui_but_is_view_item(const uiBut *but) ATTR_WARN_UNUSED_RESULT;
 /**
  * Can we mouse over the button or is it hidden/disabled/layout.
  * \note ctrl is kind of a hack currently,
@@ -1406,9 +1397,7 @@ uiBut *ui_list_row_find_from_index(const struct ARegion *region,
                                    uiBut *listbox) ATTR_WARN_UNUSED_RESULT;
 uiBut *ui_view_item_find_mouse_over(const struct ARegion *region, const int xy[2])
     ATTR_NONNULL(1, 2);
-uiBut *ui_tree_row_find_mouse_over(const struct ARegion *region, const int xy[2])
-    ATTR_NONNULL(1, 2);
-uiBut *ui_tree_row_find_active(const struct ARegion *region);
+uiBut *ui_view_item_find_active(const struct ARegion *region);
 
 typedef bool (*uiButFindPollFn)(const uiBut *but, const void *customdata);
 /**
@@ -1546,8 +1535,8 @@ void ui_block_free_views(struct uiBlock *block);
 uiViewHandle *ui_block_view_find_matching_in_old_block(const uiBlock *new_block,
                                                        const uiViewHandle *new_view);
 
-uiButTreeRow *ui_block_view_find_treerow_in_old_block(const uiBlock *new_block,
-                                                      const uiTreeViewItemHandle *new_item_handle);
+uiButViewItem *ui_block_view_find_matching_view_item_but_in_old_block(
+    const uiBlock *new_block, const uiViewItemHandle *new_item_handle);
 
 /* interface_templates.c */
 
diff --git a/source/blender/editors/interface/interface_ops.c b/source/blender/editors/interface/interface_ops.c
index aafb56119ae..7a51ed23677 100644
--- a/source/blender/editors/interface/interface_ops.c
+++ b/source/blender/editors/interface/interface_ops.c
@@ -2054,40 +2054,39 @@ static void UI_OT_list_start_filter(wmOperatorType *ot)
 /** \name UI Tree-View Drop Operator
  * \{ */
 
-static bool ui_tree_view_drop_poll(bContext *C)
+static bool ui_view_drop_poll(bContext *C)
 {
   const wmWindow *win = CTX_wm_window(C);
   const ARegion *region = CTX_wm_region(C);
-  const uiTreeViewItemHandle *hovered_tree_item = UI_block_tree_view_find_item_at(
-      region, win->eventstate->xy);
+  const uiViewItemHandle *hovered_item = UI_block_view_find_item_at(region, win->eventstate->xy);
 
-  return hovered_tree_item != NULL;
+  return hovered_item != NULL;
 }
 
-static int ui_tree_view_drop_invoke(bContext *C, wmOperator *UNUSED(op), const wmEvent *event)
+static int ui_view_drop_invoke(bContext *C, wmOperator *UNUSED(op), const wmEvent *event)
 {
   if (event->custom != EVT_DATA_DRAGDROP) {
     return OPERATOR_CANCELLED | OPERATOR_PASS_THROUGH;
   }
 
   const ARegion *region = CTX_wm_region(C);
-  uiTreeViewItemHandle *hovered_tree_item = UI_block_tree_view_find_item_at(region, event->xy);
+  uiViewItemHandle *hovered_item = UI_block_view_find_item_at(region, event->xy);
 
-  if (!UI_tree_view_item_drop_handle(C, hovered_tree_item, event->customdata)) {
+  if (!UI_view_item_drop_handle(C, hovered_item, event->customdata)) {
     return OPERATOR_CANCELLED | OPERATOR_PASS_THROUGH;
   }
 
   return OPERATOR_FINISHED;
 }
 
-static void UI_OT_tree_view_drop(wmOperatorType *ot)
+static void UI_OT_view_drop(wmOperatorType *ot)
 {
-  ot->name = "Tree View drop";
-  ot->idname = "UI_OT_tree_view_drop";
-  ot->description = "Drag and drop items onto a tree item";
+  ot->name = "View drop";
+  ot->idname = "UI_OT_view_drop";
+  ot->description = "Drag and drop items onto a data-set item";
 
-  ot->invoke = ui_tree_view_drop_invoke;
-  ot->poll = ui_tree_view_drop_poll;
+  ot->invoke = ui_view_drop_invoke;
+  ot->poll = ui_view_drop_poll;
 
   ot->flag = OPTYPE_INTERNAL;
 }
@@ -2095,43 +2094,42 @@ static void UI_OT_tree_view_drop(wmOperatorType *ot)
 /** \} */
 
 /* -------------------------------------------------------------------- */
-/** \name UI Tree-View Item Rename Operator
+/** \name UI View Item Rename Operator
  *
- * General purpose renaming operator for tree-views. Thanks to this, to add a rename button to
- * context menus for example, tree-view API users don't have to implement their own renaming
- * operators with the same logic as they already have for their #ui::AbstractTreeViewItem::rename()
- * override.
+ * General purpose renaming operator for views. Thanks to this, to add a rename button to context
+ * menus for example, view API users don't have to implement their own renaming operators with the
+ * same logic as they already have for their #ui::AbstractViewItem::rename() override.
  *
  * \{ */
 
-static bool ui_tree_view_item_rename_poll(bContext *C)
+static bool ui_view_item_rename_poll(bContext *C)
 {
   const ARegion *region = CTX_wm_region(C);
-  const uiTreeViewItemHandle *active_item = UI_block_tree_view_find_active_item(region);
-  return active_item != NULL && UI_tree_view_item_can_rename(active_item);
+  const uiViewItemHandle *active_item = UI_block_view_find_active_item(region);
+  return active_item != NULL && UI_view_item_can_rename(active_item);
 }
 
-static int ui_tree_view_item_rename_exec(bContext *C, wmOperator *UNUSED(op))
+static int ui_view_item_rename_exec(bContext *C, wmOperator *UNUSED(op))
 {
   ARegion *region = CTX_wm_region(C);
-  uiTreeViewItemHandle *active_item = UI_block_tree_view_find_active_item(region);
+  uiViewItemHandle *active_item = UI_block_view_find_active_item(region);
 
-  UI_tree_view_item_begin_rename(active_item);
+  UI_view_item_begin_rename(active_item);
   ED_region_tag_redraw(region);
 
   return OPERATOR_FINISHED;
 }
 
-static void UI_OT_tree_view_item_rename(wmOperatorType *ot)
+static void UI_OT_view_item_rename(wmOperatorType *ot)
 {
-  ot->name = "Rename Tree-View Item";
-  ot->idname = "UI_OT_tree_view_item_rename";
-  ot->description = "Rename the active item in the tree";
+  ot->name = "Rename View Item";
+  ot->idname = "UI_OT_view_item_rename";
+  ot->description = "Rename the active item in the data-set view";
 
-  ot->exec = ui_tree_view_item_rename_exec;
-  ot->poll = ui_tree_view_item_rename_poll;
+  ot->exec = ui_view_item_rename_exec;
+  ot->poll = ui_view_item_rename_poll;
   /* Could get a custom tooltip via the `get_description()` callback and another overridable
-   * function of the tree-view. */
+   * function of the view. */
 
   ot->flag = OPTYPE_INTERNAL;
 }
@@ -2235,8 +2233,8 @@ void ED_operatortypes_ui(void)
 
   WM_operatortype_append(UI_OT_list_start_filter);
 
-  WM_operatortype_append(UI_OT_tree_view_drop);
-  WM_operatortype_append(UI_OT_tree_view_item_rename);
+  WM_operatortype_append(UI_OT_view_drop);
+  WM_operatortype_append(UI_OT_view_item_rename);
 
   /* external */
   WM_operatortype_append(UI_OT_eyedropper_color);
diff --git a/source/blender/editors/interface/interface_query.cc b/source/blender/editors/interface/interface_query.cc
index 71cf60985df..f084f3e06cb 100644
--- a/source/blender/editors/interface/interface_query.cc
+++ b/source/blender/editors/interface/interface_query.cc
@@ -54,13 +54,7 @@ bool ui_but_is_toggle(const uiBut *but)
               UI_BTYPE_TOGGLE_N,
               UI_BTYPE_CHECKBOX,
               UI_BTYPE_CHECKBOX_N,
-              UI_BTYPE_ROW,
-              UI_BTYPE_TREEROW);
-}
-
-bool ui_but_is_view_item(const uiBut *but)
-{
-  return ELEM(but->type, UI_BTYPE_TREEROW, UI_BTYPE_GRID_TILE);
+              UI_BTYPE_ROW);
 }
 
 bool ui_but_is_interactive_ex(const uiBut *but, const bool labeledit, const bool for_tooltip)
@@ -462,14 +456,9 @@ uiBut *ui_list_row_find_from_index(const ARegion *region, const int index, uiBut
   return ui_but_find(region, ui_but_is_listrow_at_index, &data);
 }
 
-static bool ui_but_is_treerow(const uiBut *but, const void *UNUSED(customdata))
-{
-  return but->type == UI_BTYPE_TREEROW;
-}
-
 static bool ui_but_is_view_item_fn(const uiBut *but, const void *UNUSED(customdata))
 {
-  return ui_but_is_view_item(but);
+  return but->type == UI_BTYPE_VIEW_ITEM;
 }
 
 uiBut *ui_view_item_find_mouse_over(const ARegion *region, const int xy[2])
@@ -477,24 +466,19 @@ uiBut *ui_view_item_find_mouse_over(const ARegion *region, const int xy[2])
   return ui_but_find_mouse_over_ex(region, xy, false, false, ui_but_is_view_item_fn, nullptr);
 }
 
-uiBut *ui_tree_row_find_mouse_over(const ARegion *region, const int xy[2])
-{
-  return ui_but_find_mouse_over_ex(region, xy, false, false, ui_but_is_treerow, nullptr);
-}
-
-static bool ui_but_is_active_treerow(const uiBut *but, const void *customdata)
+static bool ui_but_is_active_view_item(const uiBut *but, const void *UNUSED(customdata))
 {
-  if (!ui_but_is_treerow(but, customdata)) {
+  if (but->type != UI_BTYPE_VIEW_ITEM) {
     return false;
   }
 
-  const uiButTreeRow *treerow_but = (const uiButTreeRow *)but;
-  return UI_tree_view_item_is_active(treerow_but->tree_item);
+  const uiButViewItem *view_item_but = (const uiButViewItem *)but;
+  return UI_view_item_is_active(view_item_but->view_item);
 }
 
-uiBut *ui_tree_row_find_active(const ARegion *region)
+uiBut *ui_view_item_find_active(const ARegion *region)
 {
-  return ui_but_find(region, ui_but_is_active_treerow, nullptr);
+  return ui_but_find(region, ui_but_is_active_view_item, nullptr);
 }
 
 /** \} */
diff --git a/source/blender/editors/interface/interface_view.cc b/source/blender/editors/interface/interface_view.cc
index 70728565263..b35f6d2c969 100644
--- a/source/blender/editors/interface/interface_view.cc
+++ b/source/blender/editors/interface/interface_view.cc
@@ -86,24 +86,24 @@ void UI_block_views_listen(const uiBlock *block, const wmRegionListenerParams *l
   }
 }
 
-uiTreeViewItemHandle *UI_block_tree_view_find_item_at(const ARegion *region, const int xy[2])
+uiViewItemHandle *UI_block_view_find_item_at(const ARegion *region, const int xy[2])
 {
-  uiButTreeRow *tree_row_but = (uiButTreeRow *)ui_tree_row_find_mouse_over(region, xy);
-  if (!tree_row_but) {
+  uiButViewItem *item_but = (uiButViewItem *)ui_view_item_find_mouse_over(region, xy);
+  if (!item_but) {
     return nullptr;
   }
 
-  return tree_row_but->tree_item;
+  return item_but->view_item;
 }
 
-uiTreeViewItemHandle *UI_block_tree_view_find_active_item(const ARegion *region)
+uiViewItemHandle *UI_block_view_find_active_item(const ARegion *region)
 {
-  uiButTreeRow *tree_row_but = (uiButTreeRow *)ui_tree_row_find_active(region);
-  if (!tree_row_but) {
+  uiButViewItem *item_but = (uiButViewItem *)ui_view_item_find_active(region);
+  if (!item_but) {
     return nullptr;
   }
 
-  return tree_row_but->tree_item;
+  return item_but->view_item;
 }
 
 static StringRef ui_block_view_find_idname(const uiBlock &block, const AbstractView &view)
@@ -151,39 +151,38 @@ uiViewHandle *ui_block_view_find_matching_in_old_block(const uiBlock *new_block,
   return reinterpret_cast<uiViewHandle *>(old_view);
 }
 
-uiButTreeRow *ui_block_view_find_treerow_in_old_block(const uiBlock *new_block,
-                                                      const uiTreeViewItemHandle *new_item_handle)
+uiButViewItem *ui_block_view_find_matching_view_item_but_in_old_block(
+    const uiBlock *new_block, const uiViewItemHandle *new_item_handle)
 {
   uiBlock *old_block = new_block->oldblock;
   if (!old_block) {
     return nullptr;
   }
 
-  const AbstractTreeViewItem &new_item = *reinterpret_cast<const AbstractTreeViewItem *>(
-      new_item_handle);
+  const AbstractViewItem &new_item = *reinterpret_cast<const AbstractViewItem *>(new_item_handle);
   const AbstractView *old_view = ui_block_view_find_matching_in_old_block_impl(
-      *new_block, new_item.get_tree_view());
+      *new_block, new_item.get_view());
   if (!old_view) {
     return nullptr;
   }
 
   LISTBASE_FOREACH (uiBut *, old_but, &old_block->buttons) {
-    if (old_but->type != UI_BTYPE_TREEROW) {
+    if (old_but->type != UI_BTYPE_VIEW_ITEM) {
       continue;
     }
-    uiButTreeRow *old_treerow_but = (uiButTreeRow *)old_but;
-    if (!old_treerow_but->tree_item) {
+    uiButViewItem *old_item_but = (uiButViewItem *)old_but;
+    if (!old_item_but->view_item) {
       continue;
     }
-    AbstractTreeViewItem &old_item = *reinterpret_cast<AbstractTreeViewItem *>(
-        old_treerow_but->tree_item);
-    /* Check if the row is from the expected tree-view. */
-    if (&old_item.get_tree_view() != old_view) {
+    AbstractViewItem &old_item = *reinterpret_cast<AbstractViewItem *>(old_item_but->view_item);
+    /* Check if the item is from the expected view. */
+    if (&old_item.get_view() != old_view) {
       continue;
     }
 
-    if (UI_tree_view_item_matches(new_item_handle, old_treerow_but->tree_item)) {
-      return old_treerow_but;
+    if (UI_view_item_matches(reinterpret_cast<const uiViewItemHandle *>(&new_item),
+                             reinterpret_cast<const uiViewItemHandle *>(&old_item))) {
+      return old_item_but;
     }
   }
 
diff --git a/source/blender/editors/interface/interface_widgets.c b/source/blender/editors/interface/interface_widgets.c
index e2df2d77817..855e72788d2 100644
--- a/source/blender/editors/interface/interface_widgets.c
+++ b/source/blender/editors/interface/interface_widgets.c
@@ -104,8 +104,7 @@ typedef enum {
   UI_WTYPE_LISTITEM,
   UI_WTYPE_PROGRESSBAR,
   UI_WTYPE_NODESOCKET,
-  UI_WTYPE_TREEROW,
-  UI_WTYPE_GRID_TILE,
+  UI_WTYPE_VIEW_ITEM,
 } uiWidgetTypeEnum;
 
 /**
@@ -3672,12 +3671,11 @@ static void widget_progressbar(uiBut *but,
   widgetbase_draw(&wtb_bar, wcol);
 }
 
-static void widget_treerow_exec(uiWidgetColors *wcol,
-                                rcti *rect,
-                                const uiWidgetStateInfo *state,
-                                int UNUSED(roundboxalign),
-                                int indentation,
-                                const float zoom)
+static void widget_view_item(uiWidgetColors *wcol,
+                             rcti *rect,
+                             const uiWidgetStateInfo *state,
+                             int UNUSED(roundboxalign),
+                             const float zoom)
 {
   uiWidgetBase wtb;
   widget_init(&wtb);
@@ -3690,31 +3688,6 @@ static void widget_treerow_exec(uiWidgetColors *wcol,
   if ((state->but_flag & UI_ACTIVE) || (state->but_flag & UI_SELECT)) {
     widgetbase_draw(&wtb, wcol);
   }
-
-  BLI_rcti_resize(rect, BLI_rcti_size_x(rect) - UI_UNIT_X * indentation, BLI_rcti_size_y(rect));
-  BLI_rcti_translate(rect, 0.5f * UI_UNIT_X * indentation, 0);
-}
-
-static void widget_treerow(uiBut *but,
-                           uiWidgetColors *wcol,
-                           rcti *rect,
-                           const uiWidgetStateInfo *state,
-                           int roundboxalign,
-                           const float zoom)
-{
-  uiButTreeRow *tree_row = (uiButTreeRow *)but;
-  BLI_assert(but->type == UI_BTYPE_TREEROW);
-  widget_treerow_exec(wcol, rect, state, roundboxalign, tree_row->indentation, zoom);
-}
-
-static void widget_gridtile(uiWidgetColors *wcol,
-                            rcti *rect,
-                            const uiWidgetStateInfo *state,
-                            int roundboxalign,
-                            const float zoom)
-{
-  /* TODO Reuse tree-row drawing. */
-  widget_treerow_exec(wcol, rect, state, roundboxalign, 0, zoom);
 }
 
 static void widget_nodesocket(uiBut *but,
@@ -4608,14 +4581,9 @@ static uiWidgetType *widget_type(uiWidgetTypeEnum type)
       wt.custom = widget_progressbar;
       break;
 
-    case UI_WTYPE_TREEROW:
-      wt.wcol_theme = &btheme->tui.wcol_view_item;
-      wt.custom = widget_treerow;
-      break;
-
-    case UI_WTYPE_GRID_TILE:
+    case UI_WTYPE_VIEW_ITEM:
       wt.wcol_theme = &btheme->tui.wcol_view_item;
-      wt.draw = widget_gridtile;
+      wt.draw = widget_view_item;
       break;
 
     case UI_WTYPE_NODESOCKET:
@@ -4949,13 +4917,8 @@ void ui_draw_but(const bContext *C, struct ARegion *region, uiStyle *style, uiBu
         fstyle = &style->widgetlabel;
         break;
 
-      case UI_BTYPE_TREEROW:
-        wt = widget_type(UI_WTYPE_TREEROW);
-        fstyle = &style->widgetlabel;
-        break;
-
-      case UI_BTYPE_GRID_TILE:
-        wt = widget_type(UI_WTYPE_GRID_TILE);
+      case UI_BTYPE_VIEW_ITEM:
+        wt = widget_type(UI_WTYPE_VIEW_ITEM);
         fstyle = &style->widgetlabel;
         break;
 
diff --git a/source/blender/editors/interface/tree_view.cc b/source/blender/editors/interface/tree_view.cc
index ec1140e8efb..c224226ba17 100644
--- a/source/blender/editors/interface/tree_view.cc
+++ b/source/blender/editors/interface/tree_view.cc
@@ -37,9 +37,11 @@ AbstractTreeViewItem &TreeViewItemContainer::add_tree_item(
   if (root_ == nullptr) {
     root_ = this;
   }
-
+  AbstractTreeView &tree_view = static_cast<AbstractTreeView &>(*root_);
   AbstractTreeViewItem &added_item = *children_.last();
   added_item.root_ = root_;
+  tree_view.register_item(added_item);
+
   if (root_ != this) {
     /* Any item that isn't the root can be assumed to the a #AbstractTreeViewItem. Not entirely
      * nice to static_cast this, but well... */
@@ -95,7 +97,7 @@ AbstractTreeViewItem *AbstractTreeView::find_matching_child(
     const AbstractTreeViewItem &lookup_item, const TreeViewOrItem &items)
 {
   for (const auto &iter_item : items.children_) {
-    if (lookup_item.matches(*iter_item)) {
+    if (lookup_item.matches_single(*iter_item)) {
       /* We have a matching item! */
       return iter_item.get();
     }
@@ -118,9 +120,8 @@ void AbstractTreeViewItem::tree_row_click_fn(struct bContext * /*C*/,
                                              void *but_arg1,
                                              void * /*arg2*/)
 {
-  uiButTreeRow *tree_row_but = (uiButTreeRow *)but_arg1;
-  AbstractTreeViewItem &tree_item = reinterpret_cast<AbstractTreeViewItem &>(
-      *tree_row_but->tree_item);
+  uiButViewItem *item_but = (uiButViewItem *)but_arg1;
+  AbstractTreeViewItem &tree_item = reinterpret_cast<AbstractTreeViewItem &>(*item_but->view_item);
 
   tree_item.activate();
   /* Not only activate the item, also show its children. Maybe this should be optional, or
@@ -131,11 +132,11 @@ void AbstractTreeViewItem::tree_row_click_fn(struct bContext * /*C*/,
 void AbstractTreeViewItem::add_treerow_button(uiBlock &block)
 {
   /* For some reason a width > (UI_UNIT_X * 2) make the layout system use all available width. */
-  tree_row_but_ = (uiButTreeRow *)uiDefBut(
-      &block, UI_BTYPE_TREEROW, 0, "", 0, 0, UI_UNIT_X * 10, UI_UNIT_Y, nullptr, 0, 0, 0, 0, "");
+  view_item_but_ = (uiButViewItem *)uiDefBut(
+      &block, UI_BTYPE_VIEW_ITEM, 0, "", 0, 0, UI_UNIT_X * 10, UI_UNIT_Y, nullptr, 0, 0, 0, 0, "");
 
-  tree_row_but_->tree_item = reinterpret_cast<uiTreeViewItemHandle *>(this);
-  UI_but_func_set(&tree_row_but_->but, tree_row_click_fn, tree_row_but_, nullptr);
+  view_item_but_->view_item = reinterpret_cast<uiViewItemHandle *>(this);
+  UI_but_func_set(&view_item_but_->but, tree_row_click_fn, view_item_but_, nullptr);
 }
 
 void AbstractTreeViewItem::add_indent(uiLayout &row) const
@@ -167,10 +168,9 @@ void AbstractTreeViewItem::collapse_chevron_click_fn(struct bContext *C,
 
   const wmWindow *win = CTX_wm_window(C);
   const ARegion *region = CTX_wm_region(C);
-  uiTreeViewItemHandle *hovered_item_handle = UI_block_tree_view_find_item_at(region,
-                                                                              win->eventstate->xy);
-  AbstractTreeViewItem *hovered_item = reinterpret_cast<AbstractTreeViewItem *>(
-      hovered_item_handle);
+  uiViewItemHandle *hovered_item_handle = UI_block_view_find_item_at(region, win->eventstate->xy);
+
+  AbstractTreeViewItem *hovered_item = from_item_handle<AbstractTreeViewItem>(hovered_item_handle);
   BLI_assert(hovered_item != nullptr);
 
   hovered_item->toggle_collapsed();
@@ -204,40 +204,6 @@ void AbstractTreeViewItem::add_collapse_chevron(uiBlock &block) const
   BLI_assert(is_collapse_chevron_but(but));
 }
 
-AbstractTreeViewItem *AbstractTreeViewItem::find_tree_item_from_rename_button(
-    const uiBut &rename_but)
-{
-  /* A minimal sanity check, can't do much more here. */
-  BLI_assert(rename_but.type == UI_BTYPE_TEXT && rename_but.poin);
-
-  LISTBASE_FOREACH (uiBut *, but, &rename_but.block->buttons) {
-    if (but->type != UI_BTYPE_TREEROW) {
-      continue;
-    }
-
-    uiButTreeRow *tree_row_but = (uiButTreeRow *)but;
-    AbstractTreeViewItem *item = reinterpret_cast<AbstractTreeViewItem *>(tree_row_but->tree_item);
-    const AbstractTreeView &tree_view = item->get_tree_view();
-
-    if (item->is_renaming() && (tree_view.get_rename_buffer().data() == rename_but.poin)) {
-      return item;
-    }
-  }
-
-  return nullptr;
-}
-
-void AbstractTreeViewItem::rename_button_fn(bContext *UNUSED(C), void *arg, char *UNUSED(origstr))
-{
-  const uiBut *rename_but = static_cast<uiBut *>(arg);
-  AbstractTreeViewItem *item = find_tree_item_from_rename_button(*rename_but);
-  BLI_assert(item);
-
-  const AbstractTreeView &tree_view = item->get_tree_view();
-  item->rename(tree_view.get_rename_buffer().data());
-  item->end_renaming();
-}
-
 void AbstractTreeViewItem::add_rename_button(uiLayout &row)
 {
   uiBlock *block = uiLayoutGetBlock(&row);
@@ -247,33 +213,7 @@ void AbstractTreeViewItem::add_rename_button(uiLayout &row)
   /* Enable emboss for the text button. */
   UI_block_emboss_set(block, UI_EMBOSS);
 
-  AbstractTreeView &tree_view = get_tree_view();
-  uiBut *rename_but = uiDefBut(block,
-                               UI_BTYPE_TEXT,
-                               1,
-                               "",
-                               0,
-                               0,
-                               UI_UNIT_X * 10,
-                               UI_UNIT_Y,
-                               tree_view.get_rename_buffer().data(),
-                               1.0f,
-                               tree_view.get_rename_buffer().size(),
-                               0,
-                               0,
-                               "");
-
-  /* Gotta be careful with what's passed to the `arg1` here. Any tree data will be freed once the
-   * callback is executed. */
-  UI_but_func_rename_set(rename_but, AbstractTreeViewItem::rename_button_fn, rename_but);
-  UI_but_flag_disable(rename_but, UI_BUT_UNDO);
-
-  const bContext *evil_C = static_cast<bContext *>(block->evil_C);
-  ARegion *region = CTX_wm_region(evil_C);
-  /* Returns false if the button was removed. */
-  if (UI_but_active_only(evil_C, region, block, rename_but) == false) {
-    end_renaming();
-  }
+  AbstractViewItem::add_rename_button(*block);
 
   UI_block_emboss_set(block, previous_emboss);
   UI_block_layout_set_current(block, &row);
@@ -306,82 +246,35 @@ bool AbstractTreeViewItem::supports_collapsing() const
   return true;
 }
 
-std::unique_ptr<AbstractTreeViewItemDragController> AbstractTreeViewItem::create_drag_controller()
-    const
-{
-  /* There's no drag controller (and hence no drag support) by default. */
-  return nullptr;
-}
-
-std::unique_ptr<AbstractTreeViewItemDropController> AbstractTreeViewItem::create_drop_controller()
-    const
-{
-  /* There's no drop controller (and hence no drop support) by default. */
-  return nullptr;
-}
-
-bool AbstractTreeViewItem::supports_renaming() const
+StringRef AbstractTreeViewItem::get_rename_string() const
 {
-  /* No renaming by default. */
-  return false;
+  return label_;
 }
 
 bool AbstractTreeViewItem::rename(StringRefNull new_name)
 {
-  /* It is important to update the label after renaming, so #AbstractTreeViewItem::matches()
+  /* It is important to update the label after renaming, so #AbstractTreeViewItem::matches_single()
    * recognizes the item. (It only compares labels by default.) */
   label_ = new_name;
   return true;
 }
 
-void AbstractTreeViewItem::build_context_menu(bContext & /*C*/, uiLayout & /*column*/) const
-{
-  /* No context menu by default. */
-}
-
 void AbstractTreeViewItem::update_from_old(const AbstractViewItem &old)
 {
   AbstractViewItem::update_from_old(old);
 
   const AbstractTreeViewItem &old_tree_item = dynamic_cast<const AbstractTreeViewItem &>(old);
   is_open_ = old_tree_item.is_open_;
-  is_renaming_ = old_tree_item.is_renaming_;
 }
 
-bool AbstractTreeViewItem::matches(const AbstractTreeViewItem &other) const
+bool AbstractTreeViewItem::matches_single(const AbstractTreeViewItem &other) const
 {
   return label_ == other.label_;
 }
 
-void AbstractTreeViewItem::begin_renaming()
-{
-  AbstractTreeView &tree_view = get_tree_view();
-  if (tree_view.is_renaming() || !supports_renaming()) {
-    return;
-  }
-
-  if (tree_view.begin_renaming()) {
-    is_renaming_ = true;
-  }
-
-  std::copy(std::begin(label_), std::end(label_), std::begin(tree_view.get_rename_buffer()));
-}
-
-void AbstractTreeViewItem::end_renaming()
-{
-  if (!is_renaming()) {
-    return;
-  }
-
-  is_renaming_ = false;
-
-  AbstractTreeView &tree_view = get_tree_view();
-  tree_view.end_renaming();
-}
-
 AbstractTreeView &AbstractTreeViewItem::get_tree_view() const
 {
-  return static_cast<AbstractTreeView &>(*root_);
+  return dynamic_cast<AbstractTreeView &>(get_view());
 }
 
 int AbstractTreeViewItem::count_parents() const
@@ -417,26 +310,19 @@ void AbstractTreeViewItem::deactivate()
   is_active_ = false;
 }
 
-bool AbstractTreeViewItem::is_active() const
-{
-  BLI_assert_msg(get_tree_view().is_reconstructed(),
-                 "State can't be queried until reconstruction is completed");
-  return is_active_;
-}
-
 bool AbstractTreeViewItem::is_hovered() const
 {
   BLI_assert_msg(get_tree_view().is_reconstructed(),
                  "State can't be queried until reconstruction is completed");
-  BLI_assert_msg(tree_row_but_ != nullptr,
+  BLI_assert_msg(view_item_but_ != nullptr,
                  "Hovered state can't be queried before the tree row is being built");
 
-  const uiTreeViewItemHandle *this_handle = reinterpret_cast<const uiTreeViewItemHandle *>(this);
+  const uiViewItemHandle *this_item_handle = reinterpret_cast<const uiViewItemHandle *>(this);
   /* The new layout hasn't finished construction yet, so the final state of the button is unknown.
    * Get the matching button from the previous redraw instead. */
-  uiButTreeRow *old_treerow_but = ui_block_view_find_treerow_in_old_block(tree_row_but_->but.block,
-                                                                          this_handle);
-  return old_treerow_but && (old_treerow_but->but.flag & UI_ACTIVE);
+  uiButViewItem *old_item_but = ui_block_view_find_matching_view_item_but_in_old_block(
+      view_item_but_->but.block, this_item_handle);
+  return old_item_but && (old_item_but->but.flag & UI_ACTIVE);
 }
 
 bool AbstractTreeViewItem::is_collapsed() const
@@ -464,11 +350,6 @@ bool AbstractTreeViewItem::is_collapsible() const
   return this->supports_collapsing();
 }
 
-bool AbstractTreeViewItem::is_renaming() const
-{
-  return is_renaming_;
-}
-
 void AbstractTreeViewItem::ensure_parents_uncollapsed()
 {
   for (AbstractTreeViewItem *parent = parent_; parent; parent = parent->parent_) {
@@ -476,19 +357,21 @@ void AbstractTreeViewItem::ensure_parents_uncollapsed()
   }
 }
 
-bool AbstractTreeViewItem::matches_including_parents(const AbstractTreeViewItem &other) const
+bool AbstractTreeViewItem::matches(const AbstractViewItem &other) const
 {
-  if (!matches(other)) {
+  const AbstractTreeViewItem &other_tree_item = dynamic_cast<const AbstractTreeViewItem &>(other);
+
+  if (!matches_single(other_tree_item)) {
     return false;
   }
-  if (count_parents() != other.count_parents()) {
+  if (count_parents() != other_tree_item.count_parents()) {
     return false;
   }
 
-  for (AbstractTreeViewItem *parent = parent_, *other_parent = other.parent_;
+  for (AbstractTreeViewItem *parent = parent_, *other_parent = other_tree_item.parent_;
        parent && other_parent;
        parent = parent->parent_, other_parent = other_parent->parent_) {
-    if (!parent->matches(*other_parent)) {
+    if (!parent->matches_single(*other_parent)) {
       return false;
     }
   }
@@ -496,9 +379,9 @@ bool AbstractTreeViewItem::matches_including_parents(const AbstractTreeViewItem
   return true;
 }
 
-uiButTreeRow *AbstractTreeViewItem::tree_row_button()
+uiButViewItem *AbstractTreeViewItem::view_item_button()
 {
-  return tree_row_but_;
+  return view_item_but_;
 }
 
 void AbstractTreeViewItem::change_state_delayed()
@@ -511,25 +394,6 @@ void AbstractTreeViewItem::change_state_delayed()
 
 /* ---------------------------------------------------------------------- */
 
-AbstractTreeViewItemDragController::AbstractTreeViewItemDragController(AbstractTreeView &tree_view)
-    : tree_view_(tree_view)
-{
-}
-
-void AbstractTreeViewItemDragController::on_drag_start()
-{
-  /* Do nothing by default. */
-}
-
-/* ---------------------------------------------------------------------- */
-
-AbstractTreeViewItemDropController::AbstractTreeViewItemDropController(AbstractTreeView &tree_view)
-    : tree_view_(tree_view)
-{
-}
-
-/* ---------------------------------------------------------------------- */
-
 class TreeViewLayoutBuilder {
   uiBlock &block_;
 
@@ -575,7 +439,7 @@ void TreeViewLayoutBuilder::polish_layout(const uiBlock &block)
       UI_but_drawflag_enable(static_cast<uiBut *>(but->next), UI_BUT_NO_TEXT_PADDING);
     }
 
-    if (but->type == UI_BTYPE_TREEROW) {
+    if (but->type == UI_BTYPE_VIEW_ITEM) {
       break;
     }
   }
@@ -687,154 +551,4 @@ std::optional<bool> BasicTreeViewItem::should_be_active() const
   return std::nullopt;
 }
 
-/* ---------------------------------------------------------------------- */
-
-/**
- * Helper for a public (C-)API, presenting higher level functionality. Has access to internal
- * data/functionality (friend of #AbstractTreeViewItem), which is sometimes needed when
- * functionality of the API needs to be constructed from multiple internal conditions and/or
- * functions that on their own shouldn't be part of the API.
- */
-class TreeViewItemAPIWrapper {
- public:
-  static bool matches(const AbstractTreeViewItem &a, const AbstractTreeViewItem &b)
-  {
-    /* TODO should match the tree-view as well. */
-    return a.matches_including_parents(b);
-  }
-
-  static bool drag_start(bContext &C, const AbstractTreeViewItem &item)
-  {
-    const std::unique_ptr<AbstractTreeViewItemDragController> drag_controller =
-        item.create_drag_controller();
-    if (!drag_controller) {
-      return false;
-    }
-
-    WM_event_start_drag(&C,
-                        ICON_NONE,
-                        drag_controller->get_drag_type(),
-                        drag_controller->create_drag_data(),
-                        0,
-                        WM_DRAG_FREE_DATA);
-    drag_controller->on_drag_start();
-
-    return true;
-  }
-
-  static bool can_drop(const AbstractTreeViewItem &item,
-                       const wmDrag &drag,
-                       const char **r_disabled_hint)
-  {
-    const std::unique_ptr<AbstractTreeViewItemDropController> drop_controller =
-        item.create_drop_controller();
-    if (!drop_controller) {
-      return false;
-    }
-
-    return drop_controller->can_drop(drag, r_disabled_hint);
-  }
-
-  static std::string drop_tooltip(const AbstractTreeViewItem &item, const wmDrag &drag)
-  {
-    const std::unique_ptr<AbstractTreeViewItemDropController> drop_controller =
-        item.create_drop_controller();
-    if (!drop_controller) {
-      return {};
-    }
-
-    return drop_controller->drop_tooltip(drag);
-  }
-
-  static bool drop_handle(bContext &C, const AbstractTreeViewItem &item, const ListBase &drags)
-  {
-    std::unique_ptr<AbstractTreeViewItemDropController> drop_controller =
-        item.create_drop_controller();
-
-    const char *disabled_hint_dummy = nullptr;
-    LISTBASE_FOREACH (const wmDrag *, drag, &drags) {
-      if (drop_controller->can_drop(*drag, &disabled_hint_dummy)) {
-        return drop_controller->on_drop(&C, *drag);
-      }
-    }
-
-    return false;
-  }
-
-  static bool can_rename(const AbstractTreeViewItem &item)
-  {
-    const AbstractTreeView &tree_view = item.get_tree_view();
-    return !tree_view.is_renaming() && item.supports_renaming();
-  }
-};
-
 }  // namespace blender::ui
-
-/* ---------------------------------------------------------------------- */
-/* C-API */
-
-using namespace blender::ui;
-
-bool UI_tree_view_item_is_active(const uiTreeViewItemHandle *item_handle)
-{
-  const AbstractTreeViewItem &item = reinterpret_cast<const AbstractTreeViewItem &>(*item_handle);
-  return item.is_active();
-}
-
-bool UI_tree_view_item_matches(const uiTreeViewItemHandle *a_handle,
-                               const uiTreeViewItemHandle *b_handle)
-{
-  const AbstractTreeViewItem &a = reinterpret_cast<const AbstractTreeViewItem &>(*a_handle);
-  const AbstractTreeViewItem &b = reinterpret_cast<const AbstractTreeViewItem &>(*b_handle);
-  return TreeViewItemAPIWrapper::matches(a, b);
-}
-
-bool UI_tree_view_item_drag_start(bContext *C, uiTreeViewItemHandle *item_)
-{
-  const AbstractTreeViewItem &item = reinterpret_cast<const AbstractTreeViewItem &>(*item_);
-  return TreeViewItemAPIWrapper::drag_start(*C, item);
-}
-
-bool UI_tree_view_item_can_drop(const uiTreeViewItemHandle *item_,
-                                const wmDrag *drag,
-                                const char **r_disabled_hint)
-{
-  const AbstractTreeViewItem &item = reinterpret_cast<const AbstractTreeViewItem &>(*item_);
-  return TreeViewItemAPIWrapper::can_drop(item, *drag, r_disabled_hint);
-}
-
-char *UI_tree_view_item_drop_tooltip(const uiTreeViewItemHandle *item_, const wmDrag *drag)
-{
-  const AbstractTreeViewItem &item = reinterpret_cast<const AbstractTreeViewItem &>(*item_);
-
-  const std::string tooltip = TreeViewItemAPIWrapper::drop_tooltip(item, *drag);
-  return tooltip.empty() ? nullptr : BLI_strdup(tooltip.c_str());
-}
-
-bool UI_tree_view_item_drop_handle(bContext *C,
-                                   const uiTreeViewItemHandle *item_,
-                                   const ListBase *drags)
-{
-  const AbstractTreeViewItem &item = reinterpret_cast<const AbstractTreeViewItem &>(*item_);
-  return TreeViewItemAPIWrapper::drop_handle(*C, item, *drags);
-}
-
-bool UI_tree_view_item_can_rename(const uiTreeViewItemHandle *item_handle)
-{
-  const AbstractTreeViewItem &item = reinterpret_cast<const AbstractTreeViewItem &>(*item_handle);
-  return TreeViewItemAPIWrapper::can_rename(item);
-}
-
-void UI_tree_view_item_begin_rename(uiTreeViewItemHandle *item_handle)
-{
-  AbstractTreeViewItem &item = reinterpret_cast<AbstractTreeViewItem &>(*item_handle);
-  item.begin_renaming();
-}
-
-void UI_tree_view_item_context_menu_build(bContext *C,
-                                          const uiTreeViewItemHandle *item_handle,
-                                          uiLayout *column)
-{
-  const AbstractTreeViewItem &item = reinterpret_cast<const AbstractTreeViewItem &>(*item_handle);
-  item.build_context_menu(*C, *column);
-}