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LibHTML: Add is<T> and to<T> helpers for LayoutNode class family

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This commit is contained in:
Andreas Kling 2019-10-15 14:19:52 +02:00
parent bbee1c5b98
commit d14b60533f
6 changed files with 75 additions and 5 deletions
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53
Libraries/LibHTML/Layout/LayoutNode.h
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@ -63,6 +63,7 @@ public:
virtual bool is_text() const { return false; }
virtual bool is_block() const { return false; }
virtual bool is_replaced() const { return false; }
bool has_style() const { return m_has_style; }
bool is_inline() const { return m_inline; }
void set_inline(bool b) { m_inline = b; }
@ -136,3 +137,55 @@ inline const LayoutNodeWithStyle* LayoutNode::parent() const
{
return static_cast<const LayoutNodeWithStyle*>(TreeNode<LayoutNode>::parent());
}
template<typename T>
inline bool is(const LayoutNode&)
{
return false;
}
template<typename T>
inline bool is(const LayoutNode* node)
{
return node && is<T>(*node);
}
template<>
inline bool is<LayoutNode>(const LayoutNode&)
{
return true;
}
template<>
inline bool is<LayoutNodeWithStyle>(const LayoutNode& node)
{
return node.has_style();
}
template<typename T>
inline const T& to(const LayoutNode& node)
{
ASSERT(is<T>(node));
return static_cast<const T&>(node);
}
template<typename T>
inline T* to(LayoutNode* node)
{
ASSERT(is<T>(node));
return static_cast<T*>(node);
}
template<typename T>
inline const T* to(const LayoutNode* node)
{
ASSERT(is<T>(node));
return static_cast<const T*>(node);
}
template<typename T>
inline T& to(LayoutNode& node)
{
ASSERT(is<T>(node));
return static_cast<T&>(node);
}