extension.driver.php

<?php

	require_once(TOOLKIT . '/class.alert.php');

	class Extension_Enhanced_Upload_Field extends Extension {

		const FIELD_TABLE = 'tbl_fields_enhanced_upload';
		const FIELD_NAME = 'enhanced_upload';

		public function getSubscribedDelegates() {
			return array(
						array(
							'page' => '/backend/',
							'delegate' => 'AdminPagePreGenerate',
							'callback' => '__appendAssets'
						),
					);
		}

		public static function hasInstance($ext_name=NULL, $section_handle) {
			$sid  = SectionManager::fetchIDFromHandle($section_handle);
			$section = SectionManager::fetch($sid);
			$fm = $section->fetchFields($ext_name);
			return is_array($fm) && !empty($fm);
		}

		/**
		* append needed css an js files to the document head
		*/
		public function __appendAssets($context) {
			$callback = Symphony::Engine()->getPageCallback();

			// Append styles for publish area
			if ($callback['driver'] == 'publish' && $callback['context']['page'] != 'index') {
				if (self::hasInstance('enhanced_upload', $callback['context']['section_handle'])) {
					Administration::instance()->Page->addScriptToHead(URL . '/extensions/enhanced_upload_field/assets/script.enhanced_upload_field.js', 80, false);
				}
			}
		}

		public function uninstall() {
			return Symphony::Database()->query(sprintf(
					"DROP TABLE IF EXISTS `%s`",
					self::FIELD_TABLE
			));
		}

		public function install(){
			return Symphony::Database()->query(sprintf(
				"CREATE TABLE `%s` (
					`id` int(11) unsigned NOT NULL auto_increment,
					`field_id` int(11) unsigned NOT NULL,
					`destination` varchar(255) NOT NULL,
					`override` enum('yes','no') default 'yes',
					`validator` varchar(50),
					`unique` enum('yes','no') default 'yes',
					PRIMARY KEY (`id`),
					KEY `field_id` (`field_id`)
				) ENGINE=MyISAM DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;",
				self::FIELD_TABLE
			));
		}
	}