jiti-meet/react/features/filmstrip/middleware.web.js

// @flow

import VideoLayout from '../../../modules/UI/videolayout/VideoLayout';
import {
    DOMINANT_SPEAKER_CHANGED,
    getDominantSpeakerParticipant,
    getLocalParticipant,
    PARTICIPANT_JOINED,
    PARTICIPANT_LEFT
} from '../base/participants';
import { MiddlewareRegistry } from '../base/redux';
import { CLIENT_RESIZED } from '../base/responsive-ui';
import { SETTINGS_UPDATED } from '../base/settings';
import {
    getCurrentLayout,
    LAYOUTS,
    setTileView
} from '../video-layout';

import { ADD_STAGE_PARTICIPANT, REMOVE_STAGE_PARTICIPANT, SET_USER_FILMSTRIP_WIDTH } from './actionTypes';
import {
    addStageParticipant,
    removeStageParticipant,
    setFilmstripWidth,
    setHorizontalViewDimensions,
    setStageParticipants,
    setTileViewDimensions,
    setVerticalViewDimensions
} from './actions';
import {
    ACTIVE_PARTICIPANT_TIMEOUT,
    DEFAULT_FILMSTRIP_WIDTH,
    MAX_ACTIVE_PARTICIPANTS,
    MIN_STAGE_VIEW_WIDTH
} from './constants';
import {
    isFilmstripResizable,
    updateRemoteParticipants,
    updateRemoteParticipantsOnLeave
} from './functions';
import './subscriber';
import { getActiveParticipantsIds, isStageFilmstripEnabled } from './functions.web';

/**
 * Map of timers.
 *
 * @type {Map}
 */
const timers = new Map();

/**
 * The middleware of the feature Filmstrip.
 */
MiddlewareRegistry.register(store => next => action => {
    if (action.type === PARTICIPANT_LEFT) {
        // This has to be executed before we remove the participant from features/base/participants state in order to
        // remove the related thumbnail component before we need to re-render it. If we do this after next()
        // we will be in sitation where the participant exists in the remoteParticipants array in features/filmstrip
        // but doesn't exist in features/base/participants state which will lead to rendering a thumbnail for
        // non-existing participant.
        updateRemoteParticipantsOnLeave(store, action.participant?.id);
    }

    let result;

    switch (action.type) {
    case CLIENT_RESIZED: {
        const state = store.getState();
        const layout = getCurrentLayout(state);

        switch (layout) {
        case LAYOUTS.TILE_VIEW: {
            store.dispatch(setTileViewDimensions());
            break;
        }
        case LAYOUTS.HORIZONTAL_FILMSTRIP_VIEW:
            store.dispatch(setHorizontalViewDimensions());
            break;

        case LAYOUTS.VERTICAL_FILMSTRIP_VIEW:
            store.dispatch(setVerticalViewDimensions());
            break;
        }

        if (isFilmstripResizable(state)) {
            const { width: filmstripWidth } = state['features/filmstrip'];
            const { clientWidth } = action;
            let width;

            if (filmstripWidth.current > clientWidth - MIN_STAGE_VIEW_WIDTH) {
                width = Math.max(clientWidth - MIN_STAGE_VIEW_WIDTH, DEFAULT_FILMSTRIP_WIDTH);
            } else {
                width = Math.min(clientWidth - MIN_STAGE_VIEW_WIDTH, filmstripWidth.userSet);
            }

            if (width !== filmstripWidth.current) {
                store.dispatch(setFilmstripWidth(width));
            }
        }
        break;
    }
    case PARTICIPANT_JOINED: {
        result = next(action);
        updateRemoteParticipants(store, action.participant?.id);
        break;
    }
    case SETTINGS_UPDATED: {
        if (typeof action.settings?.localFlipX === 'boolean') {
            // TODO: This needs to be removed once the large video is Reactified.
            VideoLayout.onLocalFlipXChanged();
        }
        if (action.settings?.disableSelfView) {
            const state = store.getState();
            const local = getLocalParticipant(state);
            const activeParticipantsIds = getActiveParticipantsIds(state);

            if (activeParticipantsIds.find(id => id === local.id)) {
                store.dispatch(removeStageParticipant(local.id));
            }
        }
        break;
    }
    case SET_USER_FILMSTRIP_WIDTH: {
        VideoLayout.refreshLayout();
        break;
    }
    case ADD_STAGE_PARTICIPANT: {
        const { dispatch, getState } = store;
        const { participantId, pinned } = action;
        const state = getState();
        const { activeParticipants } = state['features/filmstrip'];
        let queue;

        if (activeParticipants.find(p => p.participantId === participantId)) {
            queue = activeParticipants.filter(p => p.participantId !== participantId);
            queue.push({
                participantId,
                pinned
            });
            const tid = timers.get(participantId);

            clearTimeout(tid);
        } else if (activeParticipants.length < MAX_ACTIVE_PARTICIPANTS) {
            queue = [ ...activeParticipants, {
                participantId,
                pinned
            } ];
        } else {
            const notPinnedIndex = activeParticipants.findIndex(p => !p.pinned);

            if (notPinnedIndex === -1) {
                if (pinned) {
                    queue = [ ...activeParticipants, {
                        participantId,
                        pinned
                    } ];
                    queue.shift();
                }
            } else {
                queue = [ ...activeParticipants, {
                    participantId,
                    pinned
                } ];
                queue.splice(notPinnedIndex, 1);
            }
        }

        dispatch(setStageParticipants(queue));
        if (!pinned) {
            const timeoutId = setTimeout(() => dispatch(removeStageParticipant(participantId)),
                ACTIVE_PARTICIPANT_TIMEOUT);

            timers.set(participantId, timeoutId);
        }
        if (getCurrentLayout(state) === LAYOUTS.TILE_VIEW) {
            dispatch(setTileView(false));
        }
        break;
    }
    case REMOVE_STAGE_PARTICIPANT: {
        const state = store.getState();
        const { participantId } = action;
        const tid = timers.get(participantId);

        clearTimeout(tid);
        timers.delete(participantId);
        const dominant = getDominantSpeakerParticipant(state);

        if (participantId === dominant?.id) {
            const timeoutId = setTimeout(() => store.dispatch(removeStageParticipant(participantId)),
                ACTIVE_PARTICIPANT_TIMEOUT);

            timers.set(participantId, timeoutId);

            return;
        }
        break;
    }
    case DOMINANT_SPEAKER_CHANGED: {
        const { id } = action.participant;
        const state = store.getState();
        const stageFilmstrip = isStageFilmstripEnabled(state);
        const currentLayout = getCurrentLayout(state);

        if (stageFilmstrip && currentLayout === LAYOUTS.VERTICAL_FILMSTRIP_VIEW) {
            store.dispatch(addStageParticipant(id));
        }
        break;
    }
    case PARTICIPANT_LEFT: {
        const { id } = action.participant;
        const activeParticipantsIds = getActiveParticipantsIds(store.getState());

        if (activeParticipantsIds.find(pId => pId === id)) {
            store.dispatch(removeStageParticipant(id));
        }
        break;
    }
    }

    return result ?? next(action);
});