rx-player/dist/es2017/compat/on_height_width_change.js

Canal+ HTML5 Video Player

/**
 * Copyright 2015 CANAL+ Group
 *
 * 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.
 */
import log from "../log";
import globalScope from "../utils/global_scope";
import SharedReference from "../utils/reference";
const _ResizeObserver = globalScope.ResizeObserver;
/**
 * Emit the current height and width of the given `element` each time it
 * changes.
 *
 * On some browsers, we might not be able to rely on a native API to know when
 * it changes, the `interval` argument allow us to provide us an inverval in
 * milliseconds at which we should query that element's size.
 * @param {HTMLElement} element
 * @param {number} interval
 * @returns {Object}
 */
export default function onHeightWidthChange(element, interval, cancellationSignal) {
    const { height: initHeight, width: initWidth } = element.getBoundingClientRect();
    const ref = new SharedReference({
        height: initHeight,
        width: initWidth,
    }, cancellationSignal);
    let lastHeight = initHeight;
    let lastWidth = initWidth;
    if (_ResizeObserver !== undefined) {
        const resizeObserver = new _ResizeObserver((entries) => {
            if (entries.length === 0) {
                log.error("utils", "Resized but no observed element.");
                return;
            }
            const entry = entries[0];
            const { height, width } = entry.contentRect;
            if (height !== lastHeight || width !== lastWidth) {
                lastHeight = height;
                lastWidth = width;
                ref.setValue({ height, width });
            }
        });
        resizeObserver.observe(element);
        cancellationSignal.register(() => {
            resizeObserver.disconnect();
        });
    }
    else {
        const intervalId = setInterval(() => {
            const { height, width } = element.getBoundingClientRect();
            if (height !== lastHeight || width !== lastWidth) {
                lastHeight = height;
                lastWidth = width;
                ref.setValue({ height, width });
            }
        }, interval);
        cancellationSignal.register(() => {
            clearInterval(intervalId);
        });
    }
    return ref;
}