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LibWeb: Use smart pointers between DOM and Layout tree

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DOM::Node now points to its LayoutNode with a WeakPtr.
LayoutNode points to its DOM::Node and DOM::Document with RefPtrs.

Layout trees come and go in response to various events, so the DOM tree
already has to deal with that. The DOM should always live at least as
long as the layout tree, so this patch enforces that assumption by
making layout nodes keep their corresponding DOM objects alive.

This may not be optimal, but it removes a lot of ambiguous raw pointer
action which is not worth accomodating.
This commit is contained in:
Andreas Kling 2020-10-22 20:26:32 +02:00
parent a316ca0e0d
commit 385d744989
3 changed files with 12 additions and 4 deletions
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8
Libraries/LibWeb/DOM/Node.cpp
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@ -217,4 +217,12 @@ void Node::removed_last_ref()
delete this;
}
void Node::set_layout_node(Badge<LayoutNode>, LayoutNode* layout_node) const
{
if (layout_node)
m_layout_node = layout_node->make_weak_ptr();
else
m_layout_node = nullptr;
}
}