2 files changed, 49 insertions, 0 deletions
diff --git a/src/ui/CMakeLists.txt b/src/ui/CMakeLists.txt
index 88603f48..fd15e433 100644
--- a/src/ui/CMakeLists.txt
+++ b/src/ui/CMakeLists.txt
@@ -53,6 +53,7 @@ add_library(cru_ui SHARED
 	render/ScrollRenderObject.cpp
 	render/StackLayoutRenderObject.cpp
 	render/TextRenderObject.cpp
+	render/TreeRenderObject.cpp
 	style/Condition.cpp
 	style/Styler.cpp
 	style/StyleRule.cpp
diff --git a/src/ui/render/TreeRenderObject.cpp b/src/ui/render/TreeRenderObject.cpp
new file mode 100644
index 00000000..46965b7f
--- /dev/null
+++ b/src/ui/render/TreeRenderObject.cpp
@@ -0,0 +1,48 @@
+#include "cru/ui/render/TreeRenderObject.h"
+
+namespace cru::ui::render {
+TreeRenderObjectItem::TreeRenderObjectItem(TreeRenderObject* tree_render_object,
+                                           TreeRenderObjectItem* parent)
+    : tree_render_object_(tree_render_object), parent_(parent) {}
+
+TreeRenderObjectItem::~TreeRenderObjectItem() {
+  for (auto child : children_) {
+    delete child;
+  }
+}
+
+void TreeRenderObjectItem::SetRenderObject(RenderObject* render_object) {
+  if (render_object == render_object_) return;
+  render_object_ = render_object;
+  tree_render_object_->InvalidateLayout();
+}
+
+TreeRenderObjectItem* TreeRenderObjectItem::AddItem(Index position) {
+  auto item = new TreeRenderObjectItem(tree_render_object_, this);
+  children_.insert(children_.begin() + position, item);
+  return item;
+}
+
+void TreeRenderObjectItem::RemoveItem(Index position) {
+  Expects(position >= 0 && position < children_.size());
+  delete children_[position];
+  children_.erase(children_.begin() + position);
+  tree_render_object_->InvalidateLayout();
+}
+
+TreeRenderObject::TreeRenderObject() {
+  SetChildMode(ChildMode::None);
+  root_item_ = new TreeRenderObjectItem(this, nullptr);
+}
+
+TreeRenderObject::~TreeRenderObject() { delete root_item_; }
+
+Size TreeRenderObject::OnMeasureContent(const MeasureRequirement& requirement,
+                                        const MeasureSize& preferred_size) {
+  throw Exception(u"Not implemented.");
+}
+
+void TreeRenderObject::OnLayoutContent(const Rect& content_rect) {
+  throw Exception(u"Not implemented.");
+}
+}  // namespace cru::ui::render