handler.php

<?php
namespace Bitrix\Mail\Integration\Main\UISelector;
 
use Bitrix\Main\Event;
use Bitrix\Main\EventResult;
 
class Handler
{
    const ENTITY_TYPE_MAILCONTACTS = 'MAILCONTACTS';
 
    public static function OnUISelectorGetProviderByEntityType(Event $event)
    {
        $result = new EventResult(EventResult::UNDEFINED, null, 'mail');
 
        $entityType = $event->getParameter('entityType');
 
        switch($entityType)
        {
            case self::ENTITY_TYPE_MAILCONTACTS:
                $provider = new \Bitrix\Mail\Integration\Main\UISelector\MailContacts;
                break;
            default:
                $provider = false;
        }
 
        if ($provider)
        {
            $result = new EventResult(
                EventResult::SUCCESS,
                array(
                    'result' => $provider
                ),
                'mail'
            );
        }
 
        return $result;
    }
 
    public static function OnUISelectorFillLastDestination(Event $event)
    {
        $result = new EventResult(EventResult::UNDEFINED, null, 'mail');
 
        $params = $event->getParameter('params');
        $destSortData = $event->getParameter('destSortData');
 
        $lastDestinationList = [];
 
        $mailContactCounter = 0;
 
        if (is_array($destSortData))
        {
            $mailContactLimit = 10;
 
            foreach($destSortData as $code => $sortInfo)
            {
                if($mailContactCounter >= $mailContactLimit)
                {
                    break;
                }
 
                if(preg_match('/^'.MailContacts::PREFIX.'(\d+)$/i', $code, $matches))
                {
                    if($mailContactCounter >= $mailContactLimit)
                    {
                        continue;
                    }
                    if(!isset($lastDestinationList[self::ENTITY_TYPE_MAILCONTACTS]))
                    {
                        $lastDestinationList[self::ENTITY_TYPE_MAILCONTACTS] = [];
                    }
                    $lastDestinationList[self::ENTITY_TYPE_MAILCONTACTS][$code] = $code;
                    $mailContactCounter++;
                }
            }
 
            $result = new EventResult(
                EventResult::SUCCESS,
                [
                    'lastDestinationList' => $lastDestinationList
                ],
                'mail'
            );
        }
 
        return $result;
    }
}