ArtPlayer/packages/artplayer/src/player/autoSizeMix.js

import { setStyle } from '../utils';

export default function resizeMix(art, player) {
    const {
        template: { $container, $player, $video },
    } = art;

    Object.defineProperty(player, 'autoSizeState', {
        get: () => $container.classList.contains('artplayer-auto-size'),
    });

    Object.defineProperty(player, 'autoSize', {
        value: () => {
            const { videoWidth, videoHeight } = $video;
            const { width, height } = $container.getBoundingClientRect();
            const videoRatio = videoWidth / videoHeight;
            const containerRatio = width / height;
            $container.classList.add('artplayer-auto-size');
            if (containerRatio > videoRatio) {
                const percentage = ((height * videoRatio) / width) * 100;
                setStyle($player, 'width', `${percentage}%`);
                setStyle($player, 'height', '100%');
            } else {
                const percentage = (width / videoRatio / height) * 100;
                setStyle($player, 'width', '100%');
                setStyle($player, 'height', `${percentage}%`);
            }
            art.emit('autoSizeChange');
        },
    });

    Object.defineProperty(player, 'autoSizeRemove', {
        value: () => {
            $container.classList.remove('artplayer-auto-size');
            setStyle($player, 'width', null);
            setStyle($player, 'height', null);
            art.emit('autoSizeRemove');
        },
    });
}