extension.driver.php

<?php

	Class Extension_FieldSuppressor extends Extension {

		public function about() {
			return array(
				'name' => 'Field Suppressor',
				'version' => '1.1',
				'release-date' => '2012-06-12',
				'author' => array(
			 		'name' => 'Phill Gray',
					'email' => 'pixel.ninjad@gmail.com'
				),
				'description' => 'Hide or show fields on the edit pages.'
			);
		}

		public function getSubscribedDelegates() {
			return array(
				array(
					'page' => '/backend/',
					'delegate' => 'InitaliseAdminPageHead',
					'callback' => 'initaliseAdminPageHead'
				),
				array(
					'page' => '/blueprints/sections/',
					'delegate' => 'FieldPostCreate',
					'callback' => 'saveSuppressToField'
				),
				array(
					'page' => '/blueprints/sections/',
					'delegate' => 'FieldPostEdit',
					'callback' => 'saveSuppressToField'
				),
				array(
					'page' => '/blueprints/sections/',
					'delegate' => 'SectionPostEdit',
					'callback' => 'cleanUp'
				)
			);
		}

		public function install(){
			Symphony::Database()->query('
				CREATE TABLE IF NOT EXISTS tbl_fieldsuppressor (
					`field_id` INT(11) NOT NULL,
					`section_id` INT(11) UNSIGNED DEFAULT NULL,
					`suppress` ENUM("yes","no") DEFAULT NULL,
					PRIMARY KEY (`field_id`),
					UNIQUE KEY field_id_section_id (`field_id`, `section_id`)
				) ENGINE=MyISAM
			');

            return true;
		}

		public function uninstall() {
			Symphony::Database()->query('DROP TABLE IF EXISTS tbl_fieldsuppressor');
		}

	/*-------------------------------------------------------------------------
		Utilities:
	-------------------------------------------------------------------------*/
		private function addContextToPage(Array $data = array()) {
			if(!empty($data)) {
				// Get current value and inject into Symphony Context
				$user_type = Symphony::Author()->get('user_type');
				
				Administration::instance()->Page->addElementToHead(
					new XMLElement('script', "Symphony.Context.add('fieldsuppressor', " . json_encode($data) . ");", array('type' => 'text/javascript')), 10000
				);
				Administration::instance()->Page->addElementToHead(
					new XMLElement('script', "Symphony.Context.add('user_type', " . json_encode($user_type) . ");", array('type' => 'text/javascript')), 10000
				);
			}
		}
		
		public function getSuppressedFieldsForSection($section_id = null) {
			if(!is_null($section_id) && !is_numeric($section_id)) {
				$section_id = Symphony::Database()->fetchVar('id', 0, "SELECT `id` FROM `tbl_sections` WHERE `handle` = '$section_id' LIMIT 1");
			}

			if(is_null($section_id)) return array();

			return Symphony::Database()->fetch("
				SELECT field_id, suppress
				FROM tbl_fieldsuppressor
				WHERE section_id = " . $section_id,
				'field_id'
			);
		}

	/*-------------------------------------------------------------------------
		Delegate Callbacks
	-------------------------------------------------------------------------*/
		public function initaliseAdminPageHead($context) {
			$callback = Administration::instance()->getPageCallback();
			
			// Append assets
			if($callback['driver'] == 'blueprintssections' && $callback['context'][0] == 'edit') {
				$data = $this->getSuppressedFieldsForSection($callback['context'][1]);
				$this->addContextToPage($data);
				Administration::instance()->Page->addScriptToHead(URL . '/extensions/fieldsuppressor/assets/fieldsuppressor.sections.js', 10001, false);
			}
			if($callback['driver'] == 'publish' && ($callback['context']['page'] == 'edit' || $callback['context']['page'] == 'new')) {
				$data = $this->getSuppressedFieldsForSection($callback['context']['section_handle']);
				$this->addContextToPage($data);
				Administration::instance()->Page->addScriptToHead(URL . '/extensions/fieldsuppressor/assets/fieldsuppressor.publish.js', 10001, false);
				Administration::instance()->Page->addStylesheetToHead(URL . '/extensions/fieldsuppressor/assets/fieldsuppressor.publish.css', 'screen');
			}
		}

		public function saveSuppressToField(&$context) {
			$field = $context['field'];
			
			$data = array(
				'field_id' => $field->get('id'),
				'section_id' => $field->get('parent_section'),
				'suppress' => $field->get('fieldsuppressor')
			);
			
			// Save suppressor against this field
			return Symphony::Database()->insert($data, 'tbl_fieldsuppressor', true);
		}

		public function cleanUp(&$context) {
			$section_id = $context['section_id'];

			$section_field_ids = Symphony::Database()->fetchCol("id", "SELECT id FROM tbl_fields WHERE parent_section = " . $section_id);
			$suppress_field_ids = Symphony::Database()->fetchCol("field_id", "SELECT field_id FROM tbl_fieldsuppressor WHERE section_id = " . $section_id);

			// If we have any Field ID's that tbl_fields doesn't have
			// remove them, as they have been deleted from the section
			$field_ids = array_diff($suppress_field_ids, $section_field_ids);

			if(!empty($field_ids)) {
				Symphony::Database()->delete('`tbl_fieldsuppressor`', 'field_id IN (' . implode(',', $field_ids) . ');');
			}
		}

	}