/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this file,
 * You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * The origin of this IDL file is
 * https://wicg.github.io/ResizeObserver/
 */

enum ResizeObserverBoxOptions {
    "border-box",
    "content-box"
};

dictionary ResizeObserverOptions {
    ResizeObserverBoxOptions box = "content-box";
};

[Constructor(ResizeObserverCallback callback),
 Exposed=Window,
 Pref="layout.css.resizeobserver.enabled"]
interface ResizeObserver {
    [Throws]
    void observe(Element? target, optional ResizeObserverOptions options);
    [Throws]
    void unobserve(Element? target);
    void disconnect();
};

callback ResizeObserverCallback = void (sequence<ResizeObserverEntry> entries, ResizeObserver observer);

[Constructor(Element? target),
 Pref="layout.css.resizeobserver.enabled"]
interface ResizeObserverEntry {
    readonly attribute Element target;
    readonly attribute DOMRectReadOnly? contentRect;
    // We are using a [Pure, Cached, Frozen] sequence since `FrozenArray` is not implemented in webidl.
    // This is functionally similar enough. As of #2340 Mozilla has not implemented this yet, either.
    [Frozen, Cached, Pure]
    readonly attribute sequence<ResizeObserverSize> borderBoxSize;
    [Frozen, Cached, Pure]
    readonly attribute sequence<ResizeObserverSize> contentBoxSize;
};

[Pref="layout.css.resizeobserver.enabled"]
interface ResizeObserverSize {
    readonly attribute unrestricted double inlineSize;
    readonly attribute unrestricted double blockSize;
};

[ChromeOnly,
 Pref="layout.css.resizeobserver.enabled"]
interface ResizeObservation {
    readonly attribute Element target;
    boolean isActive();
};