masto-fe-archos/app/javascript/mastodon/features/account_gallery/components/media_item.jsx

import PropTypes from "prop-types";

import classNames from "classnames";

import ImmutablePropTypes from "react-immutable-proptypes";
import ImmutablePureComponent from "react-immutable-pure-component";

import { Blurhash } from "mastodon/components/blurhash";
import { Icon }  from "mastodon/components/icon";
import { autoPlayGif, displayMedia, useBlurhash } from "mastodon/initial_state";

export default class MediaItem extends ImmutablePureComponent {

  static propTypes = {
    attachment: ImmutablePropTypes.map.isRequired,
    displayWidth: PropTypes.number.isRequired,
    onOpenMedia: PropTypes.func.isRequired,
  };

  state = {
    visible: displayMedia !== "hide_all" && !this.props.attachment.getIn(["status", "sensitive"]) || displayMedia === "show_all",
    loaded: false,
  };

  handleImageLoad = () => {
    this.setState({ loaded: true });
  };

  handleMouseEnter = e => {
    if (this.hoverToPlay()) {
      e.target.play();
    }
  };

  handleMouseLeave = e => {
    if (this.hoverToPlay()) {
      e.target.pause();
      e.target.currentTime = 0;
    }
  };

  hoverToPlay () {
    return !autoPlayGif && ["gifv", "video"].indexOf(this.props.attachment.get("type")) !== -1;
  }

  handleClick = e => {
    if (e.button === 0 && !(e.ctrlKey || e.metaKey)) {
      e.preventDefault();

      if (this.state.visible) {
        this.props.onOpenMedia(this.props.attachment);
      } else {
        this.setState({ visible: true });
      }
    }
  };

  render () {
    const { attachment, displayWidth } = this.props;
    const { visible, loaded } = this.state;

    const width  = `${Math.floor((displayWidth - 4) / 3) - 4}px`;
    const height = width;
    const status = attachment.get("status");
    const title  = status.get("spoiler_text") || attachment.get("description");

    let thumbnail, label, icon, content;

    if (!visible) {
      icon = (
        <span className='account-gallery__item__icons'>
          <Icon id='eye-slash' />
        </span>
      );
    } else {
      if (["audio", "video"].includes(attachment.get("type"))) {
        content = (
          <img
            src={attachment.get("preview_url") || status.getIn(["account", "avatar_static"])}
            alt={attachment.get("description")}
            lang={status.get("language")}
            onLoad={this.handleImageLoad}
          />
        );

        if (attachment.get("type") === "audio") {
          label = <Icon id='music' />;
        } else {
          label = <Icon id='play' />;
        }
      } else if (attachment.get("type") === "image") {
        const focusX = attachment.getIn(["meta", "focus", "x"]) || 0;
        const focusY = attachment.getIn(["meta", "focus", "y"]) || 0;
        const x      = ((focusX /  2) + .5) * 100;
        const y      = ((focusY / -2) + .5) * 100;

        content = (
          <img
            src={attachment.get("preview_url")}
            alt={attachment.get("description")}
            lang={status.get("language")}
            style={{ objectPosition: `${x}% ${y}%` }}
            onLoad={this.handleImageLoad}
          />
        );
      } else if (attachment.get("type") === "gifv") {
        content = (
          <video
            className='media-gallery__item-gifv-thumbnail'
            aria-label={attachment.get("description")}
            title={attachment.get("description")}
            lang={status.get("language")}
            role='application'
            src={attachment.get("url")}
            onMouseEnter={this.handleMouseEnter}
            onMouseLeave={this.handleMouseLeave}
            autoPlay={autoPlayGif}
            playsInline
            loop
            muted
          />
        );

        label = "GIF";
      }

      thumbnail = (
        <div className='media-gallery__gifv'>
          {content}

          {label && (
            <div className='media-gallery__item__badges'>
              <span className='media-gallery__gifv__label'>{label}</span>
            </div>
          )}
        </div>
      );
    }

    return (
      <div className='account-gallery__item' style={{ width, height }}>
        <a className='media-gallery__item-thumbnail' href={`/@${status.getIn(["account", "acct"])}/${status.get("id")}`} onClick={this.handleClick} title={title} target='_blank' rel='noopener noreferrer'>
          <Blurhash
            hash={attachment.get("blurhash")}
            className={classNames("media-gallery__preview", { "media-gallery__preview--hidden": visible && loaded })}
            dummy={!useBlurhash}
          />

          {visible ? thumbnail : icon}
        </a>
      </div>
    );
  }

}