moodle-mod_htmlcert/elements/element.class.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
* @subpackage customcert
* @copyright Mark Nelson <markn@moodle.com>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
defined('MOODLE_INTERNAL') || die();
class customcert_element_base {
/**
* The data for the element we are adding.
*/
public $element;
/**
* Constructor.
*
* @param stdClass $element the element data
*/
function __construct($element) {
$this->element = new stdClass();
$this->element = $element;
}
/**
* This function is responsible for adding the element for the first time
* to the database when no data has yet been specified, default values set.
* Can be overriden if more functionality is needed.
*
* @param string $element the name of the element
* @param int $pageid the page id we are saving it to
*/
public static function add_element($element, $pageid) {
global $DB;
$data = new stdClass();
$data->pageid = $pageid;
$data->element = $element;
$data->font = 'Times-Roman';
$data->size = '12';
$data->colour = 'FFFFFF';
$data->posx = '250';
$data->posy = '250';
$data->timecreated = time();
$DB->insert_record('customcert_elements', $data);
}
/**
* This function renders the form elements when adding a customcert element.
* Can be overridden if more functionality is needed.
*
* @param stdClass $mform the edit_form instance.
* @return array the form elements
*/
public function render_form_elements($mform) {
// Keep track of the number of times these elements have been
// added, so we only add the help icon once.
static $numtimesadded = 0;
// The identifier.
$id = $this->element->id;
// The common group of elements.
$group = array();
$group[] = $mform->createElement('select', 'font_' . $id, '', customcert_get_fonts());
$group[] = $mform->createElement('select', 'size_' . $id, '', customcert_get_font_sizes());
$group[] = $mform->createELement('text', 'colour_' . $id, '', array('size' => 10, 'maxlength' => 6));
$group[] = $mform->createElement('text', 'posx_' . $id, '', array('size' => 10));
$group[] = $mform->createElement('text', 'posy_' . $id, '', array('size' => 10));
// Add this group.
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$mform->addElement('group', 'elementfieldgroup_' . $id, get_string('pluginname', 'customcertelement_' . $this->element->element),
$group, array(' ' . get_string('fontsize', 'customcert') . ' ', ' ' . get_string('colour', 'customcert') . ' ',
' ' . get_string('posx', 'customcert') . ' ', ' ' . get_string('posy', 'customcert') . ' '), false);
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$this->set_form_element_types($mform);
if ($numtimesadded == 0) {
$mform->addHelpButton('elementfieldgroup_' . $id, 'commonformelements', 'customcert');
}
$numtimesadded++;
}
/**
* Performs validation on the element values.
* Can be overridden if more functionality is needed.
*
* @param array $data the submitted data
* @return array the validation errors
*/
public function validate_form_elements($data, $files) {
$errors = array();
// The identifier.
$id = $this->element->id;
// Get the group name.
$group = 'elementfieldgroup_' . $id;
// Get the colour.
$colour = 'colour_' . $id;
$colour = $data[$colour];
$colour = ltrim($colour, "#");
// Check if colour is not a valid hexadecimal value.
if(!preg_match("/[0-9A-F]{6}/i", $colour)) {
$errors[$group] = get_string('invalidcolour', 'customcert');
}
// Get position X.
$posx = 'posx_' . $id;
$posx = $data[$posx];
// Check if posx is not numeric or less than 0.
if ((!is_numeric($posx)) || ($posx < 0)) {
if (!empty($errors[$group])) {
$errors[$group] .= "<br />";
$errors[$group] .= get_string('invalidposition', 'customcert', 'X');
} else {
$errors[$group] = get_string('invalidposition', 'customcert', 'X');
}
}
// Get position Y.
$posy = 'posy_' . $id;
$posy = $data[$posy];
// Check if posy is not numeric or less than 0.
if ((!is_numeric($posy)) || ($posy < 0)) {
if (!empty($errors[$group])) {
$errors[$group] .= "<br />";
$errors[$group] .= get_string('invalidposition', 'customcert', 'Y');
} else {
$errors[$group] = get_string('invalidposition', 'customcert', 'Y');
}
}
return $errors;
}
/**
* Handles saving the form elements created by this element.
* Can be overriden if more functionality is needed.
*
* @param stdClass $data the form data.
*/
public function save_form_elements($data) {
global $DB;
// The identifier.
$id = $this->element->id;
// Get the name of the fields we want from the form.
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$datainfo = $this->save_unique_data($data);
$font = 'font_' . $id;
$size = 'size_' . $id;
$colour = 'colour_' . $id;
$posx = 'posx_' . $id;
$posy = 'posy_' . $id;
// Get the data from the form.
$element = new stdClass();
$element->id = $id;
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$element->data = $datainfo;
$element->font = (!empty($data->$font)) ? $data->$font : null;
$element->size = (!empty($data->$size)) ? $data->$size : null;
$element->colour = (!empty($data->$colour)) ? ltrim($data->$colour, "#") : null;
$element->posx = (!empty($data->$posx)) ? $data->$posx : null;
$element->posy = (!empty($data->$posy)) ? $data->$posy : null;
// Ok, now update record in the database.
$DB->update_record('customcert_elements', $element);
}
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/**
* This will handle how form data will be saved into the data column in the
* customcert column.
* Can be overriden if more functionality is needed.
*
* @param stdClass $data the form data.
*/
public function save_unique_data($data) {
return null;
}
/**
* Handles displaying the element on the pdf.
* Must be overriden.
*
* @param stdClass the pdf object, see lib/pdflib.php
*/
public function display($pdf) {
// Must be overriden.
return false;
}
/**
* Handles deleting any data this element may have introduced.
* Can be overriden if more functionality is needed.
*
* @return bool success return true if deletion success, false otherwise
*/
public function delete_element() {
global $DB;
return $DB->delete_records('customcert_elements', array('id' => $this->element->id));
}
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/**
* Helper function that sets the types, defaults and rules for the common elements.
*
* @param stdClass $mform the edit_form instance.
* @return array the form elements
*/
public function set_form_element_types($mform) {
// The identifier.
$id = $this->element->id;
// Set the types of these elements.
$mform->setType('font_' . $id, PARAM_TEXT);
$mform->setType('size_' . $id, PARAM_INT);
$mform->setType('colour_' . $id, PARAM_RAW); // Need to validate this is a hexadecimal value.
$mform->setType('posx_' . $id, PARAM_INT);
$mform->setType('posy_' . $id, PARAM_INT);
// Add some rules.
$grouprule = array();
$grouprule['colour_' . $id][] = array(null, 'required', null, 'client');
$grouprule['posx_' . $id][] = array(null, 'required', null, 'client');
$grouprule['posy_' . $id][] = array(null, 'required', null, 'client');
$mform->addGroupRule('elementfieldgroup_' . $id, $grouprule);
// Set the values of these elements.
$mform->setDefault('font_' . $id, $this->element->font);
$mform->setDefault('size_' . $id, $this->element->size);
$mform->setDefault('colour_' . $id, $this->element->colour);
$mform->setDefault('posx_' . $id, $this->element->posx);
$mform->setDefault('posy_' . $id, $this->element->posy);
}
}