...

2 files changed, 7 insertions, 0 deletions

diff --git a/include/cru/ui/render/canvas_render_object.hpp b/include/cru/ui/render/canvas_render_object.hpp
index fea68576..5fea8755 100644
--- a/include/cru/ui/render/canvas_render_object.hpp
+++ b/include/cru/ui/render/canvas_render_object.hpp
@@ -37,6 +37,10 @@ class CanvasRenderObject : public RenderObject {
 
   IEvent<CanvasPaintEventArgs>* PaintEvent() { return &paint_event_; }
 
+ protected:
+  Size OnMeasureContent(const Size& available_size) override;
+  void OnLayoutContent(const Rect& content_rect) override;
+
  private:
   Event<CanvasPaintEventArgs> paint_event_;
 };
diff --git a/include/cru/ui/render/render_object.hpp b/include/cru/ui/render/render_object.hpp
index b0a65819..0f0cb8df 100644
--- a/include/cru/ui/render/render_object.hpp
+++ b/include/cru/ui/render/render_object.hpp
@@ -32,6 +32,9 @@ struct IRenderHost : Interface {
   virtual IEvent<AfterLayoutEventArgs>* AfterLayoutEvent() = 0;
 };
 
+// Render object will not destroy its children when destroyed. Control must
+// manage lifecycle of its render objects. Since control will destroy its
+// children when destroyed, render objects will be destroyed along with it.
 class RenderObject : public Object {
  protected:
   enum class ChildMode {