moodle-mod-customcert/classes/element.php

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<?php
// This file is part of the customcert module for Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* The base class for the customcert elements.
*
* @package mod_customcert
* @copyright 2013 Mark Nelson <markn@moodle.com>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
namespace mod_customcert;
defined('MOODLE_INTERNAL') || die();
/**
* Class element
*
* All customercert element plugins are based on this class.
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*
* @package mod_customcert
* @copyright 2013 Mark Nelson <markn@moodle.com>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
abstract class element {
/**
* @var \stdClass $element The data for the element we are adding.
*/
public $element;
/**
* @var bool $showposxy Show position XY form elements?
*/
public $showposxy;
/**
* Constructor.
*
* @param \stdClass $element the element data
*/
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public function __construct($element) {
$showposxy = get_config('customcert', 'showposxy');
$this->element = clone($element);
$this->showposxy = isset($showposxy) && $showposxy;
}
/**
* This function renders the form elements when adding a customcert element.
* Can be overridden if more functionality is needed.
*
* @param edit_element_form $mform the edit_form instance.
*/
public function render_form_elements($mform) {
// Render the common elements.
element_helper::render_form_element_font($mform);
element_helper::render_form_element_colour($mform);
if ($this->showposxy) {
element_helper::render_form_element_position($mform);
}
element_helper::render_form_element_width($mform);
}
/**
* Sets the data on the form when editing an element.
* Can be overridden if more functionality is needed.
*
* @param edit_element_form $mform the edit_form instance
*/
public function definition_after_data($mform) {
// Loop through the properties of the element and set the values
// of the corresponding form element, if it exists.
foreach ($this->element as $property => $value) {
if ($mform->elementExists($property)) {
$element = $mform->getElement($property);
$element->setValue($value);
}
}
}
/**
* Performs validation on the element values.
* Can be overridden if more functionality is needed.
*
* @param array $data the submitted data
* @param array $files the submitted files
* @return array the validation errors
*/
public function validate_form_elements($data, $files) {
// Array to return the errors.
$errors = array();
// Common validation methods.
$errors += element_helper::validate_form_element_colour($data);
if ($this->showposxy) {
$errors += element_helper::validate_form_element_position($data);
}
$errors += element_helper::validate_form_element_width($data);
return $errors;
}
/**
* Handles saving the form elements created by this element.
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* Can be overridden if more functionality is needed.
*
* @param \stdClass $data the form data
* @return bool true of success, false otherwise.
*/
public function save_form_elements($data) {
global $DB;
// Get the data from the form.
$element = new \stdClass();
$element->name = $data->name;
$element->data = $this->save_unique_data($data);
$element->font = (isset($data->font)) ? $data->font : null;
$element->size = (isset($data->size)) ? $data->size : null;
$element->colour = (isset($data->colour)) ? $data->colour : null;
if ($this->showposxy) {
$element->posx = (isset($data->posx)) ? $data->posx : null;
$element->posy = (isset($data->posy)) ? $data->posy : null;
}
$element->width = (isset($data->width)) ? $data->width : null;
$element->refpoint = (isset($data->refpoint)) ? $data->refpoint : null;
$element->timemodified = time();
// Check if we are updating, or inserting a new element.
if (!empty($this->element->id)) { // Must be updating a record in the database.
$element->id = $this->element->id;
return $DB->update_record('customcert_elements', $element);
} else { // Must be adding a new one.
$element->element = $data->element;
$element->pageid = $data->pageid;
$element->sequence = \mod_customcert\element_helper::get_element_sequence($element->pageid);
$element->timecreated = time();
return $DB->insert_record('customcert_elements', $element, false);
}
}
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/**
* This will handle how form data will be saved into the data column in the
* customcert_elements table.
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* Can be overridden if more functionality is needed.
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*
* @param \stdClass $data the form data
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* @return string the unique data to save
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*/
public function save_unique_data($data) {
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return '';
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}
/**
* This handles copying data from another element of the same type.
* Can be overridden if more functionality is needed.
*
* @param \stdClass $data the form data
* @return bool returns true if the data was copied successfully, false otherwise
*/
public function copy_element($data) {
return true;
}
/**
* Handles rendering the element on the pdf.
*
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* Must be overridden.
*
* @param \pdf $pdf the pdf object
* @param bool $preview true if it is a preview, false otherwise
* @param \stdClass $user the user we are rendering this for
*/
public abstract function render($pdf, $preview, $user);
/**
* Render the element in html.
*
* Must be overridden.
*
* This function is used to render the element when we are using the
* drag and drop interface to position it.
*
* @return string the html
*/
public abstract function render_html();
/**
* Handles deleting any data this element may have introduced.
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* Can be overridden if more functionality is needed.
*
* @return bool success return true if deletion success, false otherwise
*/
public function delete() {
global $DB;
return $DB->delete_records('customcert_elements', array('id' => $this->element->id));
}
/**
* This function is responsible for handling the restoration process of the element.
*
* For example, the function may save data that is related to another course module, this
* data will need to be updated if we are restoring the course as the course module id will
* be different in the new course.
*
* @param \restore_customcert_activity_task $restore
*/
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public function after_restore($restore) {
}
/**
* Magic getter for read only access.
*
* @param string $name
*/
public function __get($name) {
if (property_exists($this->element, $name)) {
return $this->element->$name;
}
}
/**
* Returns an instance of the element class.
*
* @param \stdClass $element the element
* @return \mod_customcert\element|bool returns the instance of the element class, or false if element
* class does not exists.
*/
public static function instance($element) {
// Get the class name.
$classname = '\\customcertelement_' . $element->element . '\\element';
// Ensure the necessary class exists.
if (class_exists($classname)) {
return new $classname($element);
}
return false;
}
/**
* Return the list of possible elements to add.
*
* @return array the list of element types that can be used.
*/
public static function get_available_types() {
global $CFG;
// Array to store the element types.
$options = array();
// Check that the directory exists.
$elementdir = "$CFG->dirroot/mod/customcert/element";
if (file_exists($elementdir)) {
// Get directory contents.
$elementfolders = new \DirectoryIterator($elementdir);
// Loop through the elements folder.
foreach ($elementfolders as $elementfolder) {
// If it is not a directory or it is '.' or '..', skip it.
if (!$elementfolder->isDir() || $elementfolder->isDot()) {
continue;
}
// Check that the standard class exists, if not we do
// not want to display it as an option as it will not work.
$foldername = $elementfolder->getFilename();
// Get the class name.
$classname = '\\customcertelement_' . $foldername . '\\element';
// Ensure the necessary class exists.
if (class_exists($classname)) {
$component = "customcertelement_{$foldername}";
$options[$foldername] = get_string('pluginname', $component);
}
}
}
\core_collator::asort($options);
return $options;
}
}