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LibWeb: Give each Node a unique ID

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We maintain a directory of ID -> Node. Nodes add themselves to this
directory when they are created, receiving a random ID. When a Node is
destroyed, it removes itself from this directory. Anyone can request a
Node from the directory by its ID using `Node::from_id()`.

We reserve the `0` ID to mean "none".

These IDs allow different processes to communicate about a given Node
over IPC, for example the DOM Inspector.
This commit is contained in:
Sam Atkins 2021-08-30 15:52:08 +01:00 • committed by Andreas Kling
parent 48a2239f60
commit d7485df928
3 changed files with 33 additions and 0 deletions
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5
Userland/Libraries/LibWeb/DOM/Node.h
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@ -179,6 +179,9 @@ public:
bool is_shadow_including_ancestor_of(Node const&) const;
bool is_shadow_including_inclusive_ancestor_of(Node const&) const;
i32 id() const { return m_id; }
static Node* from_id(i32 node_id);
protected:
Node(Document&, NodeType);
@ -187,6 +190,8 @@ protected:
NodeType m_type { NodeType::INVALID };
bool m_needs_style_update { false };
bool m_child_needs_style_update { false };
i32 m_id;
};
}