Source/WebCore/Modules/modern-media-controls/controls/watchos-activity-indicator.js

/*
 * Copyright (C) 2018 Apple Inc. All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

class WatchOSActivityIndicator extends Button
{

    constructor(layoutDelegate)
    {
        super({
            cssClassName: "watchos-activity-indicator",
            iconName: Icons.SpinnerSprite,
            layoutDelegate,
        });
    }

    // Public

    show()
    {
        let classList = this.element.classList;
        classList.add("spins");
        classList.remove("fades-out");
    }

    hide()
    {
        let classList = this.element.classList;
        if (!classList.contains("spins") || classList.contains("fades-out"))
            return;

        classList.add("fades-out");
        this.image.element.addEventListener("animationend", (event) => {
            if (event.animationName !== "watchos-activity-indicator-fades-out")
                return;
            classList.remove("spins");
            classList.remove("fades-out");
        }, { once: true });
    }

}