third_party/blink/renderer/core/invisible_dom/invisible_dom.cc

// Copyright 2019 The Chromium Authors. All rights reserved.
// 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/invisible_dom/invisible_dom.h"

#include "third_party/blink/renderer/core/dom/element.h"
#include "third_party/blink/renderer/core/dom/flat_tree_traversal.h"
#include "third_party/blink/renderer/core/dom/node.h"

namespace blink {
bool InvisibleDOM::IsInsideInvisibleSubtree(const Node& node) {
  if (!RuntimeEnabledFeatures::InvisibleDOMEnabled())
    return false;
  if (!node.CanParticipateInFlatTree())
    return false;
  for (Node& ancestor : FlatTreeTraversal::InclusiveAncestorsOf(node)) {
    if (ancestor.IsElementNode() &&
        ToElement(ancestor).HasInvisibleAttribute()) {
      return true;
    }
  }
  return false;
}

Element* InvisibleDOM::InvisibleRoot(const Node& node) {
  if (!RuntimeEnabledFeatures::InvisibleDOMEnabled())
    return nullptr;
  Element* root = nullptr;
  for (Node& ancestor : FlatTreeTraversal::InclusiveAncestorsOf(node)) {
    if (ancestor.IsElementNode() &&
        ToElement(ancestor).HasInvisibleAttribute()) {
      root = &ToElement(ancestor);
    }
  }
  return root;
}

bool InvisibleDOM::ActivateRangeIfNeeded(
    const EphemeralRangeInFlatTree& range) {
  if (!RuntimeEnabledFeatures::InvisibleDOMEnabled())
    return false;
  if (range.IsNull() || range.IsCollapsed())
    return false;
  HeapVector<Member<Element>> elements_to_activate;
  for (Node& node : range.Nodes()) {
    if (!InvisibleDOM::IsInsideInvisibleSubtree(node))
      continue;
    for (Node& ancestor_node : FlatTreeTraversal::AncestorsOf(node)) {
      if (ancestor_node.IsElementNode()) {
        elements_to_activate.push_back(ToElement(ancestor_node));
        break;
      }
    }
  }
  for (Element* element : elements_to_activate) {
    element->DispatchActivateInvisibleEventIfNeeded();
  }
  return !elements_to_activate.IsEmpty();
}

}  // namespace blink