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447ecc2155
Currently, each time parent_index() is invoked, two depth-first searches are incurred to find the node's parent and grandparent. This becomes particularly expensive, for example, when trying to scroll through a large <ul> list. Instead, upon creation, traverse the DOM JSON and create a map of child nodes to their parent. Then those two lookups become hash map lookups rather than a DFS traversal.
63 lines
2 KiB
C++
63 lines
2 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2018-2020, Adam Hodgen <ant1441@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/HashMap.h>
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#include <AK/JsonObject.h>
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#include <LibGUI/Model.h>
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#include <LibWeb/Forward.h>
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namespace Web {
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class DOMTreeJSONModel final : public GUI::Model {
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public:
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static NonnullRefPtr<DOMTreeJSONModel> create(StringView dom_tree)
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{
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auto json_or_error = JsonValue::from_string(dom_tree);
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if (!json_or_error.has_value())
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VERIFY_NOT_REACHED();
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return adopt_ref(*new DOMTreeJSONModel(json_or_error.value().as_object()));
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}
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virtual ~DOMTreeJSONModel() override;
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virtual int row_count(const GUI::ModelIndex& = GUI::ModelIndex()) const override;
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virtual int column_count(const GUI::ModelIndex& = GUI::ModelIndex()) const override;
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virtual GUI::Variant data(const GUI::ModelIndex&, GUI::ModelRole) const override;
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virtual GUI::ModelIndex index(int row, int column, const GUI::ModelIndex& parent = GUI::ModelIndex()) const override;
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virtual GUI::ModelIndex parent_index(const GUI::ModelIndex&) const override;
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virtual void update() override;
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private:
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explicit DOMTreeJSONModel(JsonObject);
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ALWAYS_INLINE JsonObject const* get_parent(const JsonObject& o) const
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{
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auto parent_node = m_dom_node_to_parent_map.get(&o);
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VERIFY(parent_node.has_value());
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return *parent_node;
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}
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ALWAYS_INLINE static JsonArray const* get_children(const JsonObject& o)
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{
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if (auto const* maybe_children = o.get_ptr("children"); maybe_children)
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return &maybe_children->as_array();
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return nullptr;
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}
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void map_dom_nodes_to_parent(JsonObject const* parent, JsonObject const* child);
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GUI::Icon m_document_icon;
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GUI::Icon m_element_icon;
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GUI::Icon m_text_icon;
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JsonObject m_dom_tree;
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HashMap<JsonObject const*, JsonObject const*> m_dom_node_to_parent_map;
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};
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}
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