layout.php

См. документацию.

<?php
 
namespace Bitrix\Landing\Hook\Page;
 
use Bitrix\Landing\Field;
use Bitrix\Landing\Hook\Page;
use Bitrix\Landing\Manager;
use Bitrix\Main\Localization\Loc;
use Bitrix\Main\Text\HtmlFilter;
 
Loc::loadMessages(__FILE__);
 
class Layout extends Page
{
    protected const DEFAULT_BREAKPOINT = 'tablet';
    protected function getItems(): array
    {
        return [
            'mobile' => 'on mobile',
            'tablet' => 'on tablet',
            'desktop' => 'on desktop',
            'all' => 'never',
        ];
    }

    protected function getMap(): array
    {
        return [
            'BREAKPOINT' => new Field\Select('BREAKPOINT', [
                'title' => 'Adaptive view',
                'options' => $this->getItems(),
            ]),
        ];
    }

    public function getTitle(): string
    {
        return 'Layout breakpoint title';
//      return Loc::getMessage('LANDING_HOOK_VIEW_NAME');
    }

    public function enabled(): bool
    {
        if ($this->issetCustomExec())
        {
            return true;
        }
 
        return (bool)$this->fields['BREAKPOINT']->getValue();
    }

    public function exec(): void
    {
        if ($this->execCustom())
        {
            return;
        }
 
        $breakpoint = trim(HtmlFilter::encode($this->fields['BREAKPOINT']));
        if(!$breakpoint)
        {
            $breakpoint = self::DEFAULT_BREAKPOINT;
        }
 
        // Manager::setPageView('BodyClass', $bodyClass);
        Manager::setPageView('MainClass', 'landing-layout-breakpoint--' . $breakpoint);
    }
}