...

1 files changed, 12 insertions, 1 deletions

diff --git a/include/cru/ui/render/RenderObject.hpp b/include/cru/ui/render/RenderObject.hpp
index 09f140db..2d9cd817 100644
--- a/include/cru/ui/render/RenderObject.hpp
+++ b/include/cru/ui/render/RenderObject.hpp
@@ -121,7 +121,7 @@ class RenderObject : public Object {
   // This will set offset of this render object and call OnLayoutCore.
   void Layout(const Point& offset);
 
-  virtual void Draw(platform::graph::IPainter* painter) = 0;
+  void Draw(platform::graph::IPainter* painter);
 
   // Param point must be relative the lefttop of render object including margin.
   // Add offset before pass point to children.
@@ -145,6 +145,17 @@ class RenderObject : public Object {
   // default is to invalidate both layout and paint
   virtual void OnRemoveChild(RenderObject* removed_child, Index position);
 
+  // Draw all children with offset.
+  void DefaultDrawChildren(platform::graph::IPainter* painter);
+
+  // Draw all children with translation of content rect lefttop.
+  void DefaultDrawContent(platform::graph::IPainter* painter);
+
+  // Call DefaultDrawContent. Then call DefaultDrawChildren.
+  virtual void OnDrawCore(platform::graph::IPainter* painter);
+
+  virtual void OnDrawContent(platform::graph::IPainter* painter);
+
   // Size measure including margin and padding. Please reduce margin and padding
   // or other custom things and pass the result content measure requirement and
   // preferred size to OnMeasureContent. Return value must not be negative and