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ðŸ“ ..
ðŸ“„ AccessiblemediaField.php(4.58 KB)
ðŸ“„ AccesslevelField.php(900 B)
ðŸ“„ AliastagField.php(1.71 KB)
ðŸ“„ AuthorField.php(1.66 KB)
ðŸ“„ CachehandlerField.php(1.1 KB)
ðŸ“„ CalendarField.php(10.72 KB)
ðŸ“„ CaptchaField.php(4.15 KB)
ðŸ“„ CategoryField.php(2.9 KB)
ðŸ“„ CheckboxField.php(3.51 KB)
ðŸ“„ CheckboxesField.php(3.95 KB)
ðŸ“„ ChromestyleField.php(5.57 KB)
ðŸ“„ ColorField.php(8.14 KB)
ðŸ“„ ComboField.php(1.4 KB)
ðŸ“„ ComponentlayoutField.php(7.54 KB)
ðŸ“„ ComponentsField.php(1.73 KB)
ðŸ“„ ContenthistoryField.php(1.72 KB)
ðŸ“„ ContentlanguageField.php(908 B)
ðŸ“„ ContenttypeField.php(2.3 KB)
ðŸ“„ DatabaseconnectionField.php(2.05 KB)
ðŸ“„ EditorField.php(7.37 KB)
ðŸ“„ EmailField.php(1.45 KB)
ðŸ“„ FileField.php(3.41 KB)
ðŸ“„ FilelistField.php(5.6 KB)
ðŸ“„ FolderlistField.php(5.48 KB)
ðŸ“„ FrontendlanguageField.php(1.89 KB)
ðŸ“„ GroupedlistField.php(3.89 KB)
ðŸ“„ HeadertagField.php(970 B)
ðŸ“„ HiddenField.php(1.26 KB)
ðŸ“„ ImagelistField.php(926 B)
ðŸ“„ IntegerField.php(1.75 KB)
ðŸ“„ LanguageField.php(2.12 KB)
ðŸ“„ LastvisitdaterangeField.php(1.39 KB)
ðŸ“„ LimitboxField.php(2.19 KB)
ðŸ“„ ListField.php(5.98 KB)
ðŸ“„ MediaField.php(10.56 KB)
ðŸ“„ MenuField.php(3.06 KB)
ðŸ“„ MenuitemField.php(5.9 KB)
ðŸ“„ MeterField.php(4.53 KB)
ðŸ“„ ModulelayoutField.php(6.24 KB)
ðŸ“„ ModuleorderField.php(3.28 KB)
ðŸ“„ ModulepositionField.php(4.42 KB)
ðŸ“„ ModuletagField.php(1011 B)
ðŸ“„ NoteField.php(2.19 KB)
ðŸ“„ NumberField.php(5.08 KB)
ðŸ“„ OrderingField.php(4.89 KB)
ðŸ“„ PasswordField.php(6.12 KB)
ðŸ“„ PluginsField.php(4.4 KB)
ðŸ“„ PluginstatusField.php(649 B)
ðŸ“„ PredefinedlistField.php(3 KB)
ðŸ“„ RadioField.php(1.1 KB)
ðŸ“„ RadiobasicField.php(1.29 KB)
ðŸ“„ RangeField.php(1.38 KB)
ðŸ“„ RedirectStatusField.php(724 B)
ðŸ“„ RegistrationdaterangeField.php(1.39 KB)
ðŸ“„ RulesField.php(7.3 KB)
ðŸ“„ SessionhandlerField.php(1.2 KB)
ðŸ“„ SpacerField.php(3.39 KB)
ðŸ“„ SqlField.php(7.28 KB)
ðŸ“„ StatusField.php(714 B)
ðŸ“„ SubformField.php(10.79 KB)
ðŸ“„ TagField.php(8.24 KB)
ðŸ“„ TelephoneField.php(1.61 KB)
ðŸ“„ TemplatestyleField.php(4.84 KB)
ðŸ“„ TextField.php(7.17 KB)
ðŸ“„ TextareaField.php(4.57 KB)
ðŸ“„ TimeField.php(3.8 KB)
ðŸ“„ TimezoneField.php(3.83 KB)
ðŸ“„ TransitionField.php(4.5 KB)
ðŸ“„ UrlField.php(1.78 KB)
ðŸ“„ UserField.php(3.87 KB)
ðŸ“„ UseractiveField.php(1.08 KB)
ðŸ“„ UsergrouplistField.php(2.53 KB)
ðŸ“„ UserstateField.php(672 B)
ðŸ“„ WorkflowComponentSectionsField.php(1.47 KB)
ðŸ“„ WorkflowconditionField.php(3.23 KB)
ðŸ“„ WorkflowstageField.php(4.08 KB)

Editing: AccessiblemediaField.php

<?php
/**
 * Joomla! Content Management System
 *
 * @copyright  (C) 2020 Open Source Matters, Inc. <https://www.joomla.org>
 * @license    GNU General Public License version 2 or later; see LICENSE.txt
 */

namespace Joomla\CMS\Form\Field;

\defined('JPATH_PLATFORM') or die;

/**
 * The Field to load the form inside current form
 *
 * @since  4.0.0
 */
class AccessiblemediaField extends SubformField
{
	/**
	 * The form field type.
	 *
	 * @var    string
	 * @since  4.0.0
	 */
	protected $type = 'Accessiblemedia';

/**
	 * The preview.
	 *
	 * @var    string
	 * @since  4.0.0
	 */
	protected $preview;

/**
	 * The directory.
	 *
	 * @var    string
	 * @since  4.0.0
	 */
	protected $directory;

/**
	 * The previewWidth.
	 *
	 * @var    integer
	 * @since  4.0.0
	 */
	protected $previewWidth;

/**
	 * The previewHeight.
	 *
	 * @var    integer
	 * @since  4.0.0
	 */
	protected $previewHeight;

/**
	 * Layout to render
	 *
	 * @var    string
	 * @since  4.0.0
	 */
	protected $layout;

/**
	 * Method to get certain otherwise inaccessible properties from the form field object.
	 *
	 * @param   string  $name  The property name for which to get the value.
	 *
	 * @return  mixed  The property value or null.
	 *
	 * @since   4.0.0
	 */
	public function __get($name)
	{
		switch ($name)
		{
			case 'directory':
			case 'preview':
			case 'previewHeight':
			case 'previewWidth':
				return $this->$name;
		}

return parent::__get($name);
	}

/**
	 * Method to set certain otherwise inaccessible properties of the form field object.
	 *
	 * @param   string  $name   The property name for which to set the value.
	 * @param   mixed   $value  The value of the property.
	 *
	 * @return  void
	 *
	 * @since   4.0.0
	 */
	public function __set($name, $value)
	{
		switch ($name)
		{
			case 'directory':
			case 'preview':
				$this->$name = (string) $value;
				break;

case 'previewHeight':
			case 'previewWidth':
				$this->$name = (int) $value;
				break;

default:
				parent::__set($name, $value);
		}
	}

/**
	 * Method to attach a Form object to the field.
	 *
	 * @param   \SimpleXMLElement  $element  The SimpleXMLElement object representing the <field /> tag for the form field object.
	 * @param   mixed              $value    The form field value to validate.
	 * @param   string             $group    The field name group control value.
	 *
	 * @return  boolean  True on success.
	 *
	 * @since   4.0.0
	 */
	public function setup(\SimpleXMLElement $element, $value, $group = null)
	{
		/**
		 * If the value is not a string, it is
		 * most likely within a custom field of type subform
		 * and the value is a stdClass with properties
		 * imagefile and alt_text. So it is fine.
		*/
		if (\is_string($value))
		{
			json_decode($value);

// Check if value is a valid JSON string.
			if ($value !== '' && json_last_error() !== JSON_ERROR_NONE)
			{
				/**
				 * If the value is not empty and is not a valid JSON string,
				 * it is most likely a custom field created in Joomla 3 and
				 * the value is a string that contains the file name.
				*/
				if (is_file(JPATH_ROOT . '/' . $value))
				{
					$value = '{"imagefile":"' . $value . '","alt_text":""}';
				}
				else
				{
					$value = '';
				}
			}
		}
		elseif (!is_object($value)
			|| !property_exists($value, 'imagefile')
			|| !property_exists($value, 'alt_text'))
		{
			return false;
		}

if (!parent::setup($element, $value, $group))
		{
			return false;
		}

$this->directory = (string) $this->element['directory'];
		$this->preview = (string) $this->element['preview'];
		$this->previewHeight = isset($this->element['preview_height']) ? (int) $this->element['preview_height'] : 200;
		$this->previewWidth = isset($this->element['preview_width']) ? (int) $this->element['preview_width'] : 200;

$xml = <<<XML
<?xml version="1.0" encoding="utf-8"?>
<form>
	<fieldset
		name="accessiblemedia"
		label="JLIB_FORM_FIELD_PARAM_ACCESSIBLEMEDIA_LABEL"
	>
		<field
			name="imagefile"
			type="media"
			label="JLIB_FORM_FIELD_PARAM_ACCESSIBLEMEDIA_PARAMS_IMAGEFILE_LABEL"
			directory="$this->directory"
			preview="$this->preview"
			preview_width="$this->previewWidth"
			preview_height="$this->previewHeight"
		/>

<field
			name="alt_empty"
			type="checkbox"
			label="JLIB_FORM_FIELD_PARAM_ACCESSIBLEMEDIA_PARAMS_ALT_EMPTY_LABEL"
			description="JLIB_FORM_FIELD_PARAM_ACCESSIBLEMEDIA_PARAMS_ALT_EMPTY_DESC"
		/>
	</fieldset>
</form>
XML;
		$this->formsource = $xml;

$this->layout = 'joomla.form.field.media.accessiblemedia';

return true;
	}
}

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