[concrete5] [V8] Create a draft detail page if you make a draft calendar event, and approve the page when you publish that event.

app.php

<?php

// Add below code into your application/bootstrap/app.php
$app->bind(\Concrete\Core\Calendar\Event\EventService::class, \Application\Calendar\Event\EventService::class);

autoload.php

<?php

// Add below code into your application/bootstrap/autoload.php
$classLoader = new \Symfony\Component\ClassLoader\Psr4ClassLoader();
$classLoader->addPrefix('Application\\Calendar', DIR_APPLICATION . '/' . DIRNAME_CLASSES . '/Calendar');
$classLoader->register();

EventService.php

<?php
// application/src/Calendar/Event/EventService.php

namespace Application\Calendar\Event;

use Concrete\Core\Entity\Calendar\Calendar;
use Concrete\Core\Entity\Calendar\CalendarEvent;
use Concrete\Core\Entity\Calendar\CalendarEventVersion;
use Concrete\Core\Page\Page;
use Concrete\Core\Page\Type\Type;
use Concrete\Core\Permission\Checker;
use Concrete\Core\Support\Facade\Application;
use Concrete\Core\User\User;
use Concrete\Core\Workflow\Request\ApprovePageRequest as ApprovePagePageWorkflowRequest;

class EventService extends \Concrete\Core\Calendar\Event\EventService
{
    public function addEventVersion(CalendarEvent $event, Calendar $calendar, CalendarEventVersion $version, $repetitions = [])
    {
        parent::addEventVersion($event, $calendar, $version, $repetitions);

        $enableMoreDetails = $calendar->enableMoreDetails();
        if ($enableMoreDetails === 'C' && !$version->getPageID()) {
            // We haven't created a page yet. So let's make one, but keep it as draft
            $parent = Page::getDraftsParentPage();
            if (is_object($parent) && !$parent->isError()) {
                $type = Type::getByID($calendar->getEventPageTypeID());
                if (is_object($type)) {
                    $page = $parent->add($type, [
                        'cName' => $version->getName(),
                        'cIsDraft' => 1,
                        'cIsActive' => 0,
                        'cvIsApproved' => 0,
                        'cAcquireComposerOutputControls' => true,
                    ]);
                    $page->setAttribute($calendar->getEventPageAttributeKeyHandle(), $event);
                    $version->setPageID($page->getCollectionID());
                    $version->setRelatedPageRelationType('C');
                    $this->save($event);
                }
            }
        }
    }

    public function approve(CalendarEventVersion $version)
    {
        parent::approve($version);
        /** @var CalendarEvent $event */
        $event = $version->getEvent();
        $calendar = $event->getCalendar();

        if ($version->getPageID()) {
            // If the page is not approved, let's approve it also
            $page = Page::getByID($version->getPageID());
            if (!$page->isActive()) {
                $parent = Page::getByID($calendar->getEventPageParentID());
                $cp = new Checker($page);
                if ($cp->canApprovePageVersions() && $cp->canMoveCopyTo($parent)) {
                    $page->move($parent);
                    $u = Application::getFacadeApplication()->make(User::class);
                    $pkr = new ApprovePagePageWorkflowRequest();
                    $pkr->setRequestedPage($page);
                    $v = $page->getVersionToModify();
                    $pkr->setRequestedVersionID($v->getVersionID());
                    $pkr->setRequesterUserID($u->getUserID());
                    $response = $pkr->trigger();
                }
            }
        }
    }
}