Proyectos de Subversion LeadersLinked - Antes de SPA

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import React, { useEffect, useRef, useState } from 'react';
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import MessageBarHead from './MessageBarHead';
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import MessageBox from './MessageBox';
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import MessageTemplate from './MessageTemplate';
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function areEqual(prevProps, nextProps) {
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    return prevProps.messages.length === nextProps.messages.length
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}
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export default ({
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    messages,
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    selectedConversation,
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    onSend,
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    backendVars,
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    getMoreMessages,
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    handleShowConversation,
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    loading
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}) => {
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    const lastMessage = useRef(null);
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    useEffect(() => {
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        const observer = new IntersectionObserver(([entry]) => {
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            if (entry.isIntersecting) {
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                getMoreMessages()
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            }
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        }, {
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            rootMargin: '0px'
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        })
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        if (lastMessage.current) {
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            observer.observe(lastMessage.current)
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        }
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    }, [messages]);
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    return (
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        <div className="main-conversation-box border-gray border-radius">
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            {
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                !selectedConversation
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                    ?
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                    <div className='message-select-conversation'>
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                        <div className='msgs-select-container'>
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                            <i className='fas fa-messages icon text-gray' />
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                            <h3>
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                                No hay mensajes
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                            </h3>
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                        </div>
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                    </div>
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                    :
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                    <>
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                        <MessageBarHead
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                            selectedConversation={selectedConversation}
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                            handleShowConversation={handleShowConversation}
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                        />
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                        <div className="messages-line">
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                            {
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                                messages.length
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                                    ?
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                                    messages.map((element, i) =>
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                                        <MessageTemplate
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                                            key={i}
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                                            message={element}
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                                        />
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                                    )
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                                    :
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                                    <div className='message-select-conversation'>
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                                        <div className='msgs-select-container'>
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                                            <i className='fas fa-inbox icon' />
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                                            <h3>No hay mensajes en esta conversación</h3>
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                                        </div>
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                                    </div>
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                            }
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                            <hr ref={lastMessage} />
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                        </div>
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                        <MessageBox
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                            onSend={onSend}
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                            backendVars={backendVars}
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                        />
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                    </>
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            }
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        </div>
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    )
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}