jiti-meet/react/features/chat/components/web/MessageContainer.js

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// @flow
import React from 'react';
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import { MESSAGE_TYPE_REMOTE } from '../../constants';
import AbstractMessageContainer, { type Props }
from '../AbstractMessageContainer';
import ChatMessageGroup from './ChatMessageGroup';
/**
* Displays all received chat messages, grouped by sender.
*
* @extends AbstractMessageContainer
*/
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export default class MessageContainer extends AbstractMessageContainer<Props> {
/**
* Whether or not chat has been scrolled to the bottom of the screen. Used
* to determine if chat should be scrolled automatically to the bottom when
* the {@code ChatInput} resizes.
*/
_isScrolledToBottom: boolean;
/**
* Reference to the HTML element at the end of the list of displayed chat
* messages. Used for scrolling to the end of the chat messages.
*/
_messagesListEndRef: Object;
/**
* A React ref to the HTML element containing all {@code ChatMessageGroup}
* instances.
*/
_messageListRef: Object;
/**
* Initializes a new {@code MessageContainer} instance.
*
* @param {Props} props - The React {@code Component} props to initialize
* the new {@code MessageContainer} instance with.
*/
constructor(props: Props) {
super(props);
this._isScrolledToBottom = true;
this._messageListRef = React.createRef();
this._messagesListEndRef = React.createRef();
this._onChatScroll = this._onChatScroll.bind(this);
}
/**
* Implements {@code Component#render}.
*
* @inheritdoc
*/
render() {
const groupedMessages = this._getMessagesGroupedBySender();
const messages = groupedMessages.map((group, index) => {
const messageType = group[0] && group[0].messageType;
return (
<ChatMessageGroup
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className = { messageType || MESSAGE_TYPE_REMOTE }
key = { index }
messages = { group } />
);
});
return (
<div
id = 'chatconversation'
onScroll = { this._onChatScroll }
ref = { this._messageListRef }>
{ messages }
<div ref = { this._messagesListEndRef } />
</div>
);
}
/**
* Scrolls to the bottom again if the instance had previously been scrolled
* to the bottom. This method is used when a resize has occurred below the
* instance and bottom scroll needs to be maintained.
*
* @returns {void}
*/
maybeUpdateBottomScroll() {
if (this._isScrolledToBottom) {
this.scrollToBottom(false);
}
}
/**
* Automatically scrolls the displayed chat messages down to the latest.
*
* @param {boolean} withAnimation - Whether or not to show a scrolling
* animation.
* @returns {void}
*/
scrollToBottom(withAnimation: boolean) {
this._messagesListEndRef.current.scrollIntoView({
behavior: withAnimation ? 'smooth' : 'auto',
block: 'nearest'
});
}
_getMessagesGroupedBySender: () => Array<Array<Object>>;
_onChatScroll: () => void;
/**
* Callback invoked to listen to the current scroll location.
*
* @private
* @returns {void}
*/
_onChatScroll() {
const element = this._messageListRef.current;
this._isScrolledToBottom
= element.scrollHeight - element.scrollTop === element.clientHeight;
}
}