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

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

export default function aspectRatioMix(art, player) {
    const {
        template: { $video, $player },
        i18n,
        notice,
    } = art;

    Object.defineProperty(player, 'aspectRatio', {
        get() {
            return $player.dataset.aspectRatio || '';
        },
        set(ratio) {
            if (ratio) {
                const ratioList = ['default', '4:3', '16:9'];
                errorHandle(
                    ratioList.includes(ratio),
                    `'aspectRatio' only accept ${ratioList.toString()} as parameters`,
                );

                if (ratio === 'default') {
                    player.aspectRatio = false;
                } else {
                    const ratioArray = ratio.split(':');
                    const { videoWidth, videoHeight } = $video;
                    const { clientWidth, clientHeight } = $player;
                    const videoRatio = videoWidth / videoHeight;
                    const setupRatio = ratioArray[0] / ratioArray[1];
                    if (videoRatio > setupRatio) {
                        const percentage = (setupRatio * videoHeight) / videoWidth;
                        setStyle($video, 'width', `${percentage * 100}%`);
                        setStyle($video, 'height', '100%');
                        setStyle($video, 'padding', `0 ${(clientWidth - clientWidth * percentage) / 2}px`);
                    } else {
                        const percentage = videoWidth / setupRatio / videoHeight;
                        setStyle($video, 'width', '100%');
                        setStyle($video, 'height', `${percentage * 100}%`);
                        setStyle($video, 'padding', `${(clientHeight - clientHeight * percentage) / 2}px 0`);
                    }
                }

                $player.dataset.aspectRatio = ratio;
                notice.show(`${i18n.get('Aspect ratio')}: ${ratio === 'default' ? i18n.get('Default') : ratio}`);
                art.emit('aspectRatioChange', ratio);
            } else if (player.aspectRatio) {
                setStyle($video, 'width', null);
                setStyle($video, 'height', null);
                setStyle($video, 'padding', null);
                delete $player.dataset.aspectRatio;
                art.emit('aspectRatioRemove');
            }
        },
    });

    Object.defineProperty(player, 'aspectRatioReset', {
        set(value) {
            if (value && player.aspectRatio) {
                player.aspectRatio = player.aspectRatio;
                art.emit('aspectRatioReset');
            }
        },
    });
}