mtb_dcatadmin_album/app/Exceptions/Form/TradImage.php

<?php

namespace App\Exceptions\Form;

use Dcat\Admin\Form\Field\File;
use Dcat\Admin\Form\Field\ImageField;
use Symfony\Component\HttpFoundation\File\UploadedFile;

class TradImage extends File
{
    use ImageField;
    protected $view = 'admin.form_custom.trad-image';

    protected $rules = ['nullable', 'image'];

    public function __construct($column, $arguments = [])
    {
        parent::__construct($column, $arguments);

        $this->setupImage();
    }



    protected function setupImage()
    {
        if (! isset($this->options['accept'])) {
            $this->options['accept'] = [];
        }

        $this->options['accept']['mimeTypes'] = 'image/*';
        $this->options['isImage'] = true;
    }

    public function dimensions(array $options)
    {
        if (! $options) {
            return $this;
        }

        $this->mergeOptions(['dimensions' => $options]);

        foreach ($options as $k => &$v) {
            $v = "$k=$v";
        }

        return $this->rules('dimensions:'.implode(',', $options));
    }

    /**
     * Set ratio constraint.
     *
     * @param  float  $ratio  width/height
     * @return $this
     */
    public function ratio($ratio)
    {
        if ($ratio <= 0) {
            return $this;
        }

        return $this->dimensions(['ratio' => $ratio]);
    }

    /**
     * @param  UploadedFile  $file
     */
    protected function prepareFile(UploadedFile $file)
    {
        $this->callInterventionMethods($file->getRealPath(), $file->getMimeType());

        $this->uploadAndDeleteOriginalThumbnail($file);
    }
}