jiti-meet/react/features/filmstrip/components/native/Filmstrip.js

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// @flow
import React, { Component } from 'react';
import { ScrollView } from 'react-native';
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import { connect } from 'react-redux';
import { Container, Platform } from '../../../base/react';
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import {
isNarrowAspectRatio,
makeAspectRatioAware
} from '../../../base/responsive-ui';
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import { isFilmstripVisible } from '../../functions';
import LocalThumbnail from './LocalThumbnail';
import styles from './styles';
import Thumbnail from './Thumbnail';
/**
* Filmstrip component's property types.
*/
type Props = {
/**
* The indicator which determines whether the filmstrip is enabled.
*
* @private
*/
_enabled: boolean,
/**
* The participants in the conference.
*
* @private
*/
_participants: Array<any>,
/**
* The indicator which determines whether the filmstrip is visible.
*
* @private
*/
_visible: boolean
};
/**
* Implements a React {@link Component} which represents the filmstrip on
* mobile/React Native.
*
* @extends Component
*/
class Filmstrip extends Component<Props> {
/**
* Whether the local participant should be rendered separately from the
* remote participants i.e. outside of their {@link ScrollView}.
*/
_separateLocalThumbnail: boolean;
/**
* Constructor of the component.
*
* @inheritdoc
*/
constructor(props) {
super(props);
// XXX Our current design is to have the local participant separate from
// the remote participants. Unfortunately, Android's Video
// implementation cannot accommodate that because remote participants'
// videos appear on top of the local participant's video at times.
// That's because Android's Video utilizes EGL and EGL gives us only two
// practical layers in which we can place our participants' videos:
// layer #0 sits behind the window, creates a hole in the window, and
// there we render the LargeVideo; layer #1 is known as media overlay in
// EGL terms, renders on top of layer #0, and, consequently, is for the
// Filmstrip. With the separate LocalThumnail, we should have left the
// remote participants' Thumbnails in layer #1 and utilized layer #2 for
// LocalThumbnail. Unfortunately, layer #2 is not practical (that's why
// I said we had two practical layers only) because it renders on top of
// everything which in our case means on top of participant-related
// indicators such as moderator, audio and video muted, etc. For now we
// do not have much of a choice but to continue rendering LocalThumbnail
// as any other remote Thumbnail on Android.
this._separateLocalThumbnail = Platform.OS !== 'android';
}
/**
* Implements React's {@link Component#render()}.
*
* @inheritdoc
* @returns {ReactElement}
*/
render() {
if (!this.props._enabled) {
return null;
}
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const isNarrowAspectRatio_ = isNarrowAspectRatio(this);
const filmstripStyle
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= isNarrowAspectRatio_
? styles.filmstripNarrow
: styles.filmstripWide;
return (
<Container
style = { filmstripStyle }
visible = { this.props._visible }>
{
this._separateLocalThumbnail
&& !isNarrowAspectRatio_
&& <LocalThumbnail />
}
<ScrollView
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horizontal = { isNarrowAspectRatio_ }
showsHorizontalScrollIndicator = { false }
showsVerticalScrollIndicator = { false }
style = { styles.scrollView } >
{
!this._separateLocalThumbnail
&& !isNarrowAspectRatio_
&& <LocalThumbnail />
}
{
this._sort(
this.props._participants,
isNarrowAspectRatio_)
.map(p => (
<Thumbnail
key = { p.id }
participant = { p } />))
}
{
!this._separateLocalThumbnail
&& isNarrowAspectRatio_
&& <LocalThumbnail />
}
</ScrollView>
{
this._separateLocalThumbnail
&& isNarrowAspectRatio_
&& <LocalThumbnail />
}
</Container>
);
}
/**
* Sorts a specific array of {@code Participant}s in display order.
*
* @param {Participant[]} participants - The array of {@code Participant}s
* to sort in display order.
* @param {boolean} isNarrowAspectRatio_ - Indicates if the aspect ratio is
* wide or narrow.
* @private
* @returns {Participant[]} A new array containing the elements of the
* specified {@code participants} array sorted in display order.
*/
_sort(participants, isNarrowAspectRatio_) {
// XXX Array.prototype.sort() is not appropriate because (1) it operates
// in place and (2) it is not necessarily stable.
const sortedParticipants = [
...participants
];
if (isNarrowAspectRatio_) {
// When the narrow aspect ratio is used, we want to have the remote
// participants from right to left with the newest added/joined to
// the leftmost side. The local participant is the leftmost item.
sortedParticipants.reverse();
}
return sortedParticipants;
}
}
/**
* Maps (parts of) the redux state to the associated {@code Filmstrip}'s props.
*
* @param {Object} state - The redux state.
* @private
* @returns {{
* _participants: Participant[],
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* _visible: boolean
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* }}
*/
function _mapStateToProps(state) {
const participants = state['features/base/participants'];
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const { enabled } = state['features/filmstrip'];
return {
/**
* The indicator which determines whether the filmstrip is enabled.
*
* @private
* @type {boolean}
*/
_enabled: enabled,
/**
* The remote participants in the conference.
*
* @private
* @type {Participant[]}
*/
_participants: participants.filter(p => !p.local),
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/**
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* The indicator which determines whether the filmstrip is visible. The
* mobile/react-native Filmstrip is visible when there are at least 2
* participants in the conference (including the local one).
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*
* @private
* @type {boolean}
*/
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_visible: isFilmstripVisible(state)
};
}
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// $FlowExpectedError
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export default connect(_mapStateToProps)(makeAspectRatioAware(Filmstrip));