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// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/core/css/layout_upgrade.h"
#include "third_party/blink/renderer/core/css/container_query_data.h"
#include "third_party/blink/renderer/core/css/post_style_update_scope.h"
#include "third_party/blink/renderer/core/css/style_engine.h"
#include "third_party/blink/renderer/core/dom/container_node.h"
#include "third_party/blink/renderer/core/dom/document.h"
#include "third_party/blink/renderer/core/dom/element.h"
#include "third_party/blink/renderer/core/dom/layout_tree_builder_traversal.h"
#include "third_party/blink/renderer/core/html/html_frame_owner_element.h"
#include "third_party/blink/renderer/core/style/computed_style.h"
namespace blink {
bool DocumentLayoutUpgrade::ShouldUpgrade() {
StyleEngine& style_engine = document_.GetStyleEngine();
return style_engine.SkippedContainerRecalc() ||
style_engine.StyleAffectedByLayout();
}
bool ParentLayoutUpgrade::ShouldUpgrade() {
StyleEngine& style_engine = document_.GetStyleEngine();
return style_engine.HasViewportDependentMediaQueries() ||
style_engine.HasViewportDependentPropertyRegistrations() ||
ElementLayoutUpgrade(owner_).ShouldUpgrade();
}
bool ElementLayoutUpgrade::ShouldUpgrade() {
if (!element_.isConnected()) {
return false;
}
// We do not allow any elements to remain in a skipped state after a style
// update, therefore we always upgrade whenever we've skipped something, even
// if the current ancestors chain does not depend on layout.
StyleEngine& style_engine = element_.GetDocument().GetStyleEngine();
if (style_engine.SkippedContainerRecalc()) {
return true;
}
bool maybe_affected_by_layout =
style_engine.StyleMaybeAffectedByLayout(element_);
if (!maybe_affected_by_layout) {
return false;
}
if (PostStyleUpdateScope::AnimationData* data =
PostStyleUpdateScope::CurrentAnimationData()) {
// If an old style is stored, it means a style recalc has happened for an
// element which may need layout for computing the final style for the style
// change event. An upgrade is required, otherwise the style change for the
// element will be split across two style change events and observable
// through transitions.
if (data->HasOldStyles()) {
return true;
}
}
// For pseudo-style requests, we may have to update pseudo-elements of the
// interleaving root itself. Hence we use inclusive ancestors here.
for (const Element* ancestor = &element_; ancestor;
ancestor = LayoutTreeBuilderTraversal::ParentElement(*ancestor)) {
if (ComputedStyle::IsInterleavingRoot(ancestor->GetComputedStyle())) {
return true;
}
}
return false;
}
} // namespace blink
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