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LibHTML: Add typed child/sibling traversal helpers for LayoutNode

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Also add some special variants for the table classes, to make it a bit
more pleasant to write table code. :^)
This commit is contained in:
Andreas Kling 2019-10-18 09:36:46 +02:00
parent 6202a0ab32
commit 65ad6c35f0
6 changed files with 101 additions and 0 deletions
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52
Libraries/LibHTML/Layout/LayoutNode.h
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@ -85,6 +85,18 @@ public:
bool children_are_inline() const { return m_children_are_inline; }
void set_children_are_inline(bool value) { m_children_are_inline = value; }
template<typename U>
const U* next_sibling_of_type() const;
template<typename U>
U* next_sibling_of_type();
template<typename T>
const T* first_child_of_type() const;
template<typename T>
T* first_child_of_type();
protected:
explicit LayoutNode(const Node*);
@ -196,3 +208,43 @@ inline T& to(LayoutNode& node)
ASSERT(is<T>(node));
return static_cast<T&>(node);
}
template<typename T>
inline const T* LayoutNode::next_sibling_of_type() const
{
for (auto* sibling = next_sibling(); sibling; sibling = sibling->next_sibling()) {
if (is<T>(*sibling))
return &to<T>(*sibling);
}
return nullptr;
}
template<typename T>
inline T* LayoutNode::next_sibling_of_type()
{
for (auto* sibling = next_sibling(); sibling; sibling = sibling->next_sibling()) {
if (is<T>(*sibling))
return &to<T>(*sibling);
}
return nullptr;
}
template<typename T>
inline const T* LayoutNode::first_child_of_type() const
{
for (auto* child = first_child(); child; child = child->next_sibling()) {
if (is<T>(*child))
return &to<T>(*child);
}
return nullptr;
}
template<typename T>
inline T* LayoutNode::first_child_of_type()
{
for (auto* child = first_child(); child; child = child->next_sibling()) {
if (is<T>(*child))
return &to<T>(*child);
}
return nullptr;
}