bigbluebutton-Github/bigbluebutton-html5/imports/ui/components/presentation/container.jsx

import React, { useContext } from 'react';
import { withTracker } from 'meteor/react-meteor-data';
import { notify } from '/imports/ui/services/notification';
import PresentationService from './service';
import { Slides } from '/imports/api/slides';
import Presentation from '/imports/ui/components/presentation/component';
import PresentationToolbarService from './presentation-toolbar/service';
import { UsersContext } from '../components-data/users-context/context';
import Auth from '/imports/ui/services/auth';
import Meetings from '/imports/api/meetings';
import getFromUserSettings from '/imports/ui/services/users-settings';
import {
  layoutSelect,
  layoutSelectInput,
  layoutSelectOutput,
  layoutDispatch,
} from '../layout/context';
import lockContextContainer from "/imports/ui/components/lock-viewers/context/container";
import WhiteboardService from '/imports/ui/components/whiteboard/service';
import { DEVICE_TYPE } from '../layout/enums';

const PresentationContainer = ({ presentationIsOpen, presentationPodIds, mountPresentation, ...props }) => {

  const cameraDock = layoutSelectInput((i) => i.cameraDock);
  const presentation = layoutSelectOutput((i) => i.presentation);
  const layoutType = layoutSelect((i) => i.layoutType);
  const fullscreen = layoutSelect((i) => i.fullscreen);
  const deviceType = layoutSelect((i) => i.deviceType);
  const layoutContextDispatch = layoutDispatch();

  const { numCameras } = cameraDock;
  const { element } = fullscreen;
  const fullscreenElementId = 'Presentation';
  const fullscreenContext = (element === fullscreenElementId);

  const isIphone = !!(navigator.userAgent.match(/iPhone/i));

  const usingUsersContext = useContext(UsersContext);
  const { users } = usingUsersContext;
  const currentUser = users[Auth.meetingID][Auth.userID];
  const userIsPresenter = currentUser.presenter;

  return (
    <Presentation
      {
      ...{
        layoutContextDispatch,
        numCameras,
        ...props,
        userIsPresenter,
        presentationBounds: presentation,
        layoutType,
        fullscreenContext,
        fullscreenElementId,
        isMobile: deviceType === DEVICE_TYPE.MOBILE,
        isIphone,
        presentationIsOpen,
      }
      }
    />
  );
};

const APP_CONFIG = Meteor.settings.public.app;
const PRELOAD_NEXT_SLIDE = APP_CONFIG.preloadNextSlides;
const fetchedpresentation = {};

export default lockContextContainer( 
  withTracker(({ podId, presentationIsOpen, userLocks }) => {
  const currentSlide = PresentationService.getCurrentSlide(podId);
  const presentationIsDownloadable = PresentationService.isPresentationDownloadable(podId);
  const isViewersCursorLocked = userLocks?.hideViewersCursor;

  let slidePosition;
  if (currentSlide) {
    const {
      presentationId,
      id: slideId,
    } = currentSlide;
    slidePosition = PresentationService.getSlidePosition(podId, presentationId, slideId);
    if (PRELOAD_NEXT_SLIDE && !fetchedpresentation[presentationId]) {
      fetchedpresentation[presentationId] = {
        canFetch: true,
        fetchedSlide: {},
      };
    }
    const currentSlideNum = currentSlide.num;
    const presentation = fetchedpresentation[presentationId];

    if (PRELOAD_NEXT_SLIDE
      && !presentation.fetchedSlide[currentSlide.num + PRELOAD_NEXT_SLIDE]
      && presentation.canFetch) {
      const slidesToFetch = Slides.find({
        podId,
        presentationId,
        num: {
          $in: Array(PRELOAD_NEXT_SLIDE).fill(1).map((v, idx) => currentSlideNum + (idx + 1)),
        },
      }).fetch();

      const promiseImageGet = slidesToFetch
        .filter((s) => !fetchedpresentation[presentationId].fetchedSlide[s.num])
        .map(async (slide) => {
          if (presentation.canFetch) presentation.canFetch = false;
          const image = await fetch(slide.imageUri);
          if (image.ok) {
            presentation.fetchedSlide[slide.num] = true;
          }
        });
      Promise.all(promiseImageGet).then(() => {
        presentation.canFetch = true;
      });
    }
  }

  return {
    currentSlide,
    slidePosition,
    downloadPresentationUri: PresentationService.downloadPresentationUri(podId),
    multiUser: (WhiteboardService.hasMultiUserAccess(currentSlide && currentSlide.id, Auth.userID) || WhiteboardService.isMultiUserActive(currentSlide?.id))
      && presentationIsOpen,
    presentationIsDownloadable,
    mountPresentation: !!currentSlide,
    currentPresentation: PresentationService.getCurrentPresentation(podId),
    notify,
    zoomSlide: PresentationToolbarService.zoomSlide,
    podId,
    publishedPoll: Meetings.findOne({ meetingId: Auth.meetingID }, {
      fields: {
        publishedPoll: 1,
      },
    }).publishedPoll,
    restoreOnUpdate: getFromUserSettings(
      'bbb_force_restore_presentation_on_new_events',
      Meteor.settings.public.presentation.restoreOnUpdate,
    ),
    addWhiteboardGlobalAccess: WhiteboardService.addGlobalAccess,
    removeWhiteboardGlobalAccess: WhiteboardService.removeGlobalAccess,
    multiUserSize: WhiteboardService.getMultiUserSize(currentSlide?.id),
    isViewersCursorLocked,
  };
})(PresentationContainer));