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LibHTML: Add LayoutNode::first_ancestor_of_type<T>()

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This commit is contained in:
Andreas Kling 2019-10-18 10:16:33 +02:00
parent 65ad6c35f0
commit 2305dee455
1 changed files with 32 additions and 0 deletions
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32
Libraries/LibHTML/Layout/LayoutNode.h
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@ -67,6 +67,7 @@ public:
const StyleProperties& style() const; const StyleProperties& style() const;
LayoutNodeWithStyle* parent();
const LayoutNodeWithStyle* parent() const; const LayoutNodeWithStyle* parent() const;
void inserted_into(LayoutNode&) {} void inserted_into(LayoutNode&) {}
@ -97,6 +98,12 @@ public:
template<typename T> template<typename T>
T* first_child_of_type(); T* first_child_of_type();
template<typename T>
const T* first_ancestor_of_type() const;
template<typename T>
T* first_ancestor_of_type();
protected: protected:
explicit LayoutNode(const Node*); explicit LayoutNode(const Node*);
@ -157,6 +164,11 @@ inline const LayoutNodeWithStyle* LayoutNode::parent() const
return static_cast<const LayoutNodeWithStyle*>(TreeNode<LayoutNode>::parent()); return static_cast<const LayoutNodeWithStyle*>(TreeNode<LayoutNode>::parent());
} }
inline LayoutNodeWithStyle* LayoutNode::parent()
{
return static_cast<LayoutNodeWithStyle*>(TreeNode<LayoutNode>::parent());
}
template<typename T> template<typename T>
inline bool is(const LayoutNode&) inline bool is(const LayoutNode&)
{ {
@ -248,3 +260,23 @@ inline T* LayoutNode::first_child_of_type()
} }
return nullptr; return nullptr;
} }
template<typename T>
inline const T* LayoutNode::first_ancestor_of_type() const
{
for (auto* ancestor = parent(); ancestor; ancestor = ancestor->parent()) {
if (is<T>(*ancestor))
return &to<T>(*ancestor);
}
return nullptr;
}
template<typename T>
inline T* LayoutNode::first_ancestor_of_type()
{
for (auto* ancestor = parent(); ancestor; ancestor = ancestor->parent()) {
if (is<T>(*ancestor))
return &to<T>(*ancestor);
}
return nullptr;
}