LibHTML: Add inserted_into() and removed_from() TreeNode callbacks

These will be called when a Node or LayoutNode is inserted or removed
from a tree. They get the parent node as an argument.

1 files changed, 6 insertions, 3 deletions

diff --git a/Libraries/LibHTML/TreeNode.h b/Libraries/LibHTML/TreeNode.h
index a4da2f1f9b..36459c5c77 100644
--- a/Libraries/LibHTML/TreeNode.h
+++ b/Libraries/LibHTML/TreeNode.h
@@ -33,7 +33,7 @@ public:
     const T* first_child() const { return m_first_child; }
     const T* last_child() const { return m_last_child; }
 
-    void append_child(NonnullRefPtr<T> node);
+    void append_child(NonnullRefPtr<T> node, bool call_inserted_into = true);
     void donate_all_children_to(T& node);
 
 protected:
@@ -49,16 +49,19 @@ private:
 };
 
 template<typename T>
-inline void TreeNode<T>::append_child(NonnullRefPtr<T> node)
+inline void TreeNode<T>::append_child(NonnullRefPtr<T> node, bool call_inserted_into)
 {
     ASSERT(!node->m_parent);
     if (m_last_child)
         m_last_child->m_next_sibling = node.ptr();
     node->m_previous_sibling = m_last_child;
     node->m_parent = static_cast<T*>(this);
-    m_last_child = &node.leak_ref();
+    m_last_child = node.ptr();
     if (!m_first_child)
         m_first_child = m_last_child;
+    if (call_inserted_into)
+        node->inserted_into(static_cast<T&>(*this));
+    (void)node.leak_ref();
 }
 
 template<typename T>