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LibWeb: Avoid layout invalidation for some CSS property changes
Use the new CSS::property_affects_layout() helper to figure out if we actually need to perform a full relayout after recomputing style. There are three tiers of required invalidation after an element receives new style: none, repaint only, or full relayout. This avoids the need to rebuild the layout tree (and perform layout on it) when trivial properties like "color" etc are changed.
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275db39c94
commit
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3 changed files with 60 additions and 10 deletions
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@ -595,17 +595,20 @@ void Document::update_layout()
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m_layout_update_timer->stop();
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}
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static void update_style_recursively(DOM::Node& node)
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static bool update_style_recursively(DOM::Node& node)
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{
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if (is<Element>(node))
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static_cast<Element&>(node).recompute_style();
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bool needs_relayout = false;
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if (is<Element>(node)) {
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needs_relayout |= static_cast<Element&>(node).recompute_style() == Element::NeedsRelayout::Yes;
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}
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node.set_needs_style_update(false);
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if (node.child_needs_style_update()) {
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if (node.is_element()) {
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if (auto* shadow_root = static_cast<DOM::Element&>(node).shadow_root()) {
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if (shadow_root->needs_style_update() || shadow_root->child_needs_style_update())
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update_style_recursively(*shadow_root);
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needs_relayout |= update_style_recursively(*shadow_root);
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}
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}
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node.for_each_child([&](auto& child) {
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@ -616,6 +619,7 @@ static void update_style_recursively(DOM::Node& node)
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}
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node.set_child_needs_style_update(false);
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return needs_relayout;
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}
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void Document::update_style()
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@ -624,9 +628,9 @@ void Document::update_style()
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return;
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if (!needs_style_update() && !child_needs_style_update())
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return;
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update_style_recursively(*this);
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if (update_style_recursively(*this))
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invalidate_layout();
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m_style_update_timer->stop();
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set_needs_layout();
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}
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void Document::set_link_color(Color color)
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