lbry-desktop/ui/js/page/discover/view.jsx

import React from "react";
import lbry from "lbry.js";
import lbryio from "lbryio.js";
import lbryuri from "lbryuri";
import FileCard from "component/fileCard";
import { BusyMessage } from "component/common.js";
import ToolTip from "component/tooltip.js";

const FeaturedCategory = props => {
  const { category, names } = props;

  return (
    <div className="card-row card-row--small">
      <h3 className="card-row__header">
        {category}
        {category &&
          category.match(/^community/i) &&
          <ToolTip
            label={__("What's this?")}
            body={__(
              'Community Content is a public space where anyone can share content with the rest of the LBRY community. Bid on the names "one," "two," "three," "four" and "five" to put your content here!'
            )}
            className="tooltip--header"
          />}
      </h3>
      {names &&
        names.map(name =>
          <FileCard
            key={name}
            displayStyle="card"
            uri={lbryuri.normalize(name)}
          />
        )}
    </div>
  );
};

class DiscoverPage extends React.PureComponent {
  componentWillMount() {
    this.props.fetchFeaturedUris();
    this.scrollListener = this.handleScroll.bind(this);
  }

  componentDidMount() {
    if (this.props.isNavigatingBack) {
      const scrollY = parseInt(lbry.getClientSetting("prefs_scrolly"));
      if (!isNaN(scrollY)) {
        const restoreScrollPosition = () => {
          window.scrollTo(0, scrollY);
        };
        setTimeout(restoreScrollPosition, 100);
      }

      this.props.finishedNavigatingBack();
    }
    window.addEventListener("scroll", this.scrollListener);
  }

  handleScroll() {
    lbry.setClientSetting("prefs_scrolly", window.scrollY);
  }

  componentWillUnmount() {
    this.props.cancelResolvingUris();
    window.removeEventListener("scroll", this.scrollListener);
  }

  render() {
    const { featuredUris, fetchingFeaturedUris } = this.props;
    const failedToLoad =
      !fetchingFeaturedUris &&
      (featuredUris === undefined ||
        (featuredUris !== undefined && Object.keys(featuredUris).length === 0));

    return (
      <main>
        {fetchingFeaturedUris &&
          <BusyMessage message={__("Fetching content")} />}
        {typeof featuredUris === "object" &&
          Object.keys(featuredUris).map(
            category =>
              featuredUris[category].length
                ? <FeaturedCategory
                    key={category}
                    category={category}
                    names={featuredUris[category]}
                  />
                : ""
          )}
        {failedToLoad &&
          <div className="empty">
            {__("Failed to load landing content.")}
          </div>}
      </main>
    );
  }
}

export default DiscoverPage;