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_customcert
* @copyright Mark Nelson <markn@moodle.com>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
defined('MOODLE_INTERNAL') || die('Direct access to this script is forbidden.');
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.
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* Can be overridden 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;
// Set the time as a variable.
$time = time();
$data = new stdClass();
$data->pageid = $pageid;
$data->element = $element;
$data->font = 'Times-Roman';
$data->size = '12';
$data->colour = '#000000';
$data->posx = '250';
$data->posy = '250';
$data->sequence = customcert_element_base::get_element_sequence($pageid);
$data->timecreated = $time;
$data->timemodified = $time;
$DB->insert_record('customcert_elements', $data);
}
/**
* Returns the sequence on a specified customcert page for a
* newly created element.
*
* @param int $pageid the id of the page we are adding this element to
* @return int the element number
*/
public static function get_element_sequence($pageid) {
global $DB;
// Set the sequence of the element we are creating.
$sequence = 1;
// Check if there already elements that exist, if so, overwrite value.
$sql = "SELECT MAX(sequence) as maxsequence
FROM {customcert_elements}
WHERE pageid = :id";
// Get the current max sequence on this page and add 1 to get the new sequence.
if ($maxseq = $DB->get_record_sql($sql, array('id' => $pageid))) {
$sequence = $maxseq->maxsequence + 1;
}
return $sequence;
}
/**
* This function renders the form elements when adding a customcert element.
* Can be overridden if more functionality is needed.
*
* @param stdClass $mform the edit_form instance.
*/
public function render_form_elements($mform) {
// The identifier.
$id = $this->element->id;
// Commonly used string.
$strrequired = get_string('required');
// The common elements.
$mform->addElement('select', 'font_' . $id, get_string('font', 'customcert'), customcert_get_fonts());
$mform->addElement('select', 'size_' . $id, get_string('fontsize', 'customcert'), customcert_get_font_sizes());
$mform->addElement('customcert_colourpicker', 'colour_' . $id, get_string('fontcolour', 'customcert'));
$mform->addElement('text', 'posx_' . $id, get_string('posx', 'customcert'), array('size' => 10));
$mform->addElement('text', 'posy_' . $id, get_string('posy', 'customcert'), array('size' => 10));
// 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 that this is a valid colour.
$mform->setType('posx_' . $id, PARAM_INT);
$mform->setType('posy_' . $id, PARAM_INT);
// 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);
// Add help buttons.
$mform->addHelpButton('font_' . $id, 'font', 'customcert');
$mform->addHelpButton('size_' . $id, 'fontsize', 'customcert');
$mform->addHelpButton('colour_' . $id, 'fontcolour', 'customcert');
$mform->addHelpButton('posx_' . $id, 'posx', 'customcert');
$mform->addHelpButton('posy_' . $id, 'posy', 'customcert');
}
/**
* 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) {
$errors = array();
// The identifier.
$id = $this->element->id;
// Validate the colour.
$colour = 'colour_' . $id;
$colourdata = $data[$colour];
if (!$this->validate_colour($colourdata)) {
$errors[$colour] = get_string('invalidcolour', 'customcert');
}
// Get position X.
$posx = 'posx_' . $id;
// Check if posx is not set, or not numeric or less than 0.
if ((!isset($data[$posx])) || (!is_numeric($data[$posx])) || ($data[$posx] <= 0)) {
$errors[$posx] = get_string('invalidposition', 'customcert', 'X');
}
// Get position Y.
$posy = 'posy_' . $id;
// Check if posy is not set, or not numeric or less than 0.
if ((!isset($data[$posy])) || (!is_numeric($data[$posy])) || ($data[$posy] <= 0)) {
$errors[$posy] = get_string('invalidposition', 'customcert', 'Y');
}
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 $data the form data.
*/
public function save_form_elements($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)) ? $data->$colour : null;
$element->posx = (!empty($data->$posx)) ? $data->$posx : null;
$element->posy = (!empty($data->$posy)) ? $data->$posy : null;
$element->timemodified = time();
// 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.
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* Can be overridden if more functionality is needed.
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*
* @param stdClass $data the form data.
*/
public function save_unique_data($data) {
return null;
}
/**
* This will handle how individual elements save their data
* to a template to be loaded later.
* Can be overridden if more functionality is needed.
*
* @param stdClass $data the form data.
*/
public function save_data_to_template($data) {
return true;
}
/**
* This will handle how individual elements load their data
* from a template to an existing customcert.
* Can be overridden if more functionality is needed.
*
* @param stdClass $data the form data.
*/
public function load_data_from_template($data) {
return true;
}
/**
* Handles rendering the element on the pdf.
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* Must be overridden.
*
* @param stdClass $pdf the pdf object
* @param int $userid
*/
public function render($pdf, $userid) {
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// Must be overridden.
return false;
}
/**
* Common behaviour for rendering specified content on the pdf.
*
* @param stdClass $pdf the pdf object
* @param stdClass $content the content to render
*/
public function render_content($pdf, $content) {
$pdf->setFont($this->element->font, '', $this->element->size);
$fontcolour = TCPDF_COLORS::convertHTMLColorToDec($this->element->colour, $fontcolour);
$pdf->SetTextColor($fontcolour['R'], $fontcolour['G'], $fontcolour['B']);
$pdf->writeHTMLCell(0, 0, $this->element->posx, $this->element->posy, $content);
}
/**
* 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_element() {
global $DB;
return $DB->delete_records('customcert_elements', array('id' => $this->element->id));
}
/**
* Validates the colour selected.
*
* @param string $data
* @return string|false
*/
protected function validate_colour($colour) {
/**
* List of valid HTML colour names
*
* @var array
*/
$colournames = array(
'aliceblue', 'antiquewhite', 'aqua', 'aquamarine', 'azure',
'beige', 'bisque', 'black', 'blanchedalmond', 'blue',
'blueviolet', 'brown', 'burlywood', 'cadetblue', 'chartreuse',
'chocolate', 'coral', 'cornflowerblue', 'cornsilk', 'crimson',
'cyan', 'darkblue', 'darkcyan', 'darkgoldenrod', 'darkgray',
'darkgrey', 'darkgreen', 'darkkhaki', 'darkmagenta',
'darkolivegreen', 'darkorange', 'darkorchid', 'darkred',
'darksalmon', 'darkseagreen', 'darkslateblue', 'darkslategray',
'darkslategrey', 'darkturquoise', 'darkviolet', 'deeppink',
'deepskyblue', 'dimgray', 'dimgrey', 'dodgerblue', 'firebrick',
'floralwhite', 'forestgreen', 'fuchsia', 'gainsboro',
'ghostwhite', 'gold', 'goldenrod', 'gray', 'grey', 'green',
'greenyellow', 'honeydew', 'hotpink', 'indianred', 'indigo',
'ivory', 'khaki', 'lavender', 'lavenderblush', 'lawngreen',
'lemonchiffon', 'lightblue', 'lightcoral', 'lightcyan',
'lightgoldenrodyellow', 'lightgray', 'lightgrey', 'lightgreen',
'lightpink', 'lightsalmon', 'lightseagreen', 'lightskyblue',
'lightslategray', 'lightslategrey', 'lightsteelblue', 'lightyellow',
'lime', 'limegreen', 'linen', 'magenta', 'maroon',
'mediumaquamarine', 'mediumblue', 'mediumorchid', 'mediumpurple',
'mediumseagreen', 'mediumslateblue', 'mediumspringgreen',
'mediumturquoise', 'mediumvioletred', 'midnightblue', 'mintcream',
'mistyrose', 'moccasin', 'navajowhite', 'navy', 'oldlace', 'olive',
'olivedrab', 'orange', 'orangered', 'orchid', 'palegoldenrod',
'palegreen', 'paleturquoise', 'palevioletred', 'papayawhip',
'peachpuff', 'peru', 'pink', 'plum', 'powderblue', 'purple', 'red',
'rosybrown', 'royalblue', 'saddlebrown', 'salmon', 'sandybrown',
'seagreen', 'seashell', 'sienna', 'silver', 'skyblue', 'slateblue',
'slategray', 'slategrey', 'snow', 'springgreen', 'steelblue', 'tan',
'teal', 'thistle', 'tomato', 'turquoise', 'violet', 'wheat', 'white',
'whitesmoke', 'yellow', 'yellowgreen'
);
if (preg_match('/^#?([[:xdigit:]]{3}){1,2}$/', $colour)) {
return true;
} else if (in_array(strtolower($colour), $colournames)) {
return true;
}
return false;
}
}