cobalt/dom/intersection_observer.idl

// Copyright 2019 The Cobalt Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

// https://www.w3.org/TR/intersection-observer/#intersection-observer-interface

[Constructor(IntersectionObserverCallback callback, optional IntersectionObserverInit options),
 ConstructorCallWith=EnvironmentSettings,
 RaisesException=Constructor,
 Exposed=Window]
interface IntersectionObserver {
  readonly attribute Element? root;
  readonly attribute DOMString rootMargin;
  // TODO(b/236750294): Make this be FrozenArray<double> when available.
  readonly attribute sequence<double> thresholds;
  void observe(Element target);
  void unobserve(Element target);
  void disconnect();
  sequence<IntersectionObserverEntry> takeRecords();
};

callback IntersectionObserverCallback = void (sequence<IntersectionObserverEntry> entries, IntersectionObserver observer);