moodle-mod_htmlcert/classes/element_helper.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/>.
/**
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* Provides useful functions related to elements.
*
* @package mod_customcert
* @copyright 2016 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();
require_once($CFG->libdir . '/grade/constants.php');
require_once($CFG->dirroot . '/grade/lib.php');
require_once($CFG->dirroot . '/grade/querylib.php');
/**
* Class helper.
*
* Provides useful functions related to elements.
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*
* @package mod_customcert
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* @copyright 2016 Mark Nelson <markn@moodle.com>
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class element_helper {
/**
* @var int the top-left of element
*/
const CUSTOMCERT_REF_POINT_TOPLEFT = 0;
/**
* @var int the top-center of element
*/
const CUSTOMCERT_REF_POINT_TOPCENTER = 1;
/**
* @var int the top-left of element
*/
const CUSTOMCERT_REF_POINT_TOPRIGHT = 2;
/**
* Common behaviour for rendering specified content on the pdf.
*
* @param \pdf $pdf the pdf object
* @param \mod_customcert\element $element the customcert element
* @param string $content the content to render
*/
public static function render_content($pdf, $element, $content) {
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list($font, $attr) = self::get_font($element);
$pdf->setFont($font, $attr, $element->get_fontsize());
$fontcolour = \TCPDF_COLORS::convertHTMLColorToDec($element->get_colour(), $fontcolour);
$pdf->SetTextColor($fontcolour['R'], $fontcolour['G'], $fontcolour['B']);
$x = $element->get_posx();
$y = $element->get_posy();
$w = $element->get_width();
$refpoint = $element->get_refpoint();
$actualwidth = $pdf->GetStringWidth($content);
if ($w and $w < $actualwidth) {
$actualwidth = $w;
}
switch ($refpoint) {
case self::CUSTOMCERT_REF_POINT_TOPRIGHT:
$x = $element->get_posx() - $actualwidth;
if ($x < 0) {
$x = 0;
$w = $element->get_posx();
} else {
$w = $actualwidth;
}
break;
case self::CUSTOMCERT_REF_POINT_TOPCENTER:
$x = $element->get_posx() - $actualwidth / 2;
if ($x < 0) {
$x = 0;
$w = $element->get_posx() * 2;
} else {
$w = $actualwidth;
}
break;
}
if ($w) {
$w += 0.0001;
}
$pdf->setCellPaddings(0, 0, 0, 0);
$pdf->writeHTMLCell($w, 0, $x, $y, $content, 0, 0, false, true);
}
/**
* Common behaviour for rendering specified content on the drag and drop page.
*
* @param \mod_customcert\element $element the customcert element
* @param string $content the content to render
* @return string the html
*/
public static function render_html_content($element, $content) {
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list($font, $attr) = self::get_font($element);
$fontstyle = 'font-family: ' . $font;
if (strpos($attr, 'B') !== false) {
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$fontstyle .= '; font-weight: bold';
}
if (strpos($attr, 'I') !== false) {
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$fontstyle .= '; font-style: italic';
}
$style = $fontstyle . '; color: ' . $element->get_colour() . '; font-size: ' . $element->get_fontsize() . 'pt;';
if ($element->get_width()) {
$style .= ' width: ' . $element->get_width() . 'mm';
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}
return \html_writer::div($content, '', array('style' => $style));
}
/**
* Helper function to render the font elements.
*
* @param \MoodleQuickForm $mform the edit_form instance.
*/
public static function render_form_element_font($mform) {
$mform->addElement('select', 'font', get_string('font', 'customcert'), \mod_customcert\certificate::get_fonts());
$mform->setType('font', PARAM_TEXT);
$mform->setDefault('font', 'times');
$mform->addHelpButton('font', 'font', 'customcert');
$mform->addElement('select', 'fontsize', get_string('fontsize', 'customcert'),
\mod_customcert\certificate::get_font_sizes());
$mform->setType('fontsize', PARAM_INT);
$mform->setDefault('fontsize', 12);
$mform->addHelpButton('fontsize', 'fontsize', 'customcert');
}
/**
* Helper function to render the colour elements.
*
* @param \MoodleQuickForm $mform the edit_form instance.
*/
public static function render_form_element_colour($mform) {
$mform->addElement('customcert_colourpicker', 'colour', get_string('fontcolour', 'customcert'));
$mform->setType('colour', PARAM_RAW); // Need to validate that this is a valid colour.
$mform->setDefault('colour', '#000000');
$mform->addHelpButton('colour', 'fontcolour', 'customcert');
}
/**
* Helper function to render the position elements.
*
* @param \MoodleQuickForm $mform the edit_form instance.
*/
public static function render_form_element_position($mform) {
$mform->addElement('text', 'posx', get_string('posx', 'customcert'), array('size' => 10));
$mform->setType('posx', PARAM_INT);
$mform->setDefault('posx', 0);
$mform->addHelpButton('posx', 'posx', 'customcert');
$mform->addElement('text', 'posy', get_string('posy', 'customcert'), array('size' => 10));
$mform->setType('posy', PARAM_INT);
$mform->setDefault('posy', 0);
$mform->addHelpButton('posy', 'posy', 'customcert');
}
/**
* Helper function to render the width element.
*
* @param \MoodleQuickForm $mform the edit_form instance.
*/
public static function render_form_element_width($mform) {
$mform->addElement('text', 'width', get_string('elementwidth', 'customcert'), array('size' => 10));
$mform->setType('width', PARAM_INT);
$mform->setDefault('width', 0);
$mform->addHelpButton('width', 'elementwidth', 'customcert');
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}
/**
* Helper function to render the refpoint element.
*
* @param \MoodleQuickForm $mform the edit_form instance.
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*/
public static function render_form_element_refpoint($mform) {
$refpointoptions = array();
$refpointoptions[self::CUSTOMCERT_REF_POINT_TOPLEFT] = get_string('topleft', 'customcert');
$refpointoptions[self::CUSTOMCERT_REF_POINT_TOPCENTER] = get_string('topcenter', 'customcert');
$refpointoptions[self::CUSTOMCERT_REF_POINT_TOPRIGHT] = get_string('topright', 'customcert');
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$mform->addElement('select', 'refpoint', get_string('refpoint', 'customcert'), $refpointoptions);
$mform->setType('refpoint', PARAM_INT);
$mform->setDefault('refpoint', self::CUSTOMCERT_REF_POINT_TOPCENTER);
$mform->addHelpButton('refpoint', 'refpoint', 'customcert');
}
/**
* Helper function to performs validation on the colour element.
*
* @param array $data the submitted data
* @return array the validation errors
*/
public static function validate_form_element_colour($data) {
$errors = array();
// Validate the colour.
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if (!self::validate_colour($data['colour'])) {
$errors['colour'] = get_string('invalidcolour', 'customcert');
}
return $errors;
}
/**
* Helper function to performs validation on the position elements.
*
* @param array $data the submitted data
* @return array the validation errors
*/
public static function validate_form_element_position($data) {
$errors = array();
// Check if posx is not set, or not numeric or less than 0.
if ((!isset($data['posx'])) || (!is_numeric($data['posx'])) || ($data['posx'] < 0)) {
$errors['posx'] = get_string('invalidposition', 'customcert', 'X');
}
// Check if posy is not set, or not numeric or less than 0.
if ((!isset($data['posy'])) || (!is_numeric($data['posy'])) || ($data['posy'] < 0)) {
$errors['posy'] = get_string('invalidposition', 'customcert', 'Y');
}
return $errors;
}
/**
* Helper function to perform validation on the width element.
*
* @param array $data the submitted data
* @return array the validation errors
*/
public static function validate_form_element_width($data) {
$errors = array();
// Check if width is less than 0.
if (isset($data['width']) && $data['width'] < 0) {
$errors['width'] = get_string('invalidelementwidth', 'customcert');
}
return $errors;
}
/**
* Returns the font used for this element.
*
* @param \mod_customcert\element $element the customcert element
* @return array the font and font attributes
*/
public static function get_font($element) {
// Variable for the font.
$font = $element->get_font();
// Get the last two characters of the font name.
$fontlength = strlen($font);
$lastchar = $font[$fontlength - 1];
$secondlastchar = $font[$fontlength - 2];
// The attributes of the font.
$attr = '';
// Check if the last character is 'i'.
if ($lastchar == 'i') {
// Remove the 'i' from the font name.
$font = substr($font, 0, -1);
// Check if the second last char is b.
if ($secondlastchar == 'b') {
// Remove the 'b' from the font name.
$font = substr($font, 0, -1);
$attr .= 'B';
}
$attr .= 'I';
} else if ($lastchar == 'b') {
// Remove the 'b' from the font name.
$font = substr($font, 0, -1);
$attr .= 'B';
}
return array($font, $attr);
}
/**
* Validates the colour selected.
*
* @param string $colour
* @return bool returns true if the colour is valid, false otherwise
*/
public static function validate_colour($colour) {
// List of valid HTML colour names.
$colournames = array(
'aliceblue', 'antiquewhite', 'aqua', 'aquamarine', 'azure',
'beige', 'bisque', 'black', 'blanchedalmond', 'blue',
'blueviolet', 'brown', 'burlywood', 'cadetblue', 'chartreuse',
'chocolate', 'coral', 'cornflowerblue', 'cornsilk', 'crimson',
'cyan', 'darkblue', 'darkcyan', 'darkgoldenrod', 'darkgray',
'darkgrey', 'darkgreen', 'darkkhaki', 'darkmagenta',
'darkolivegreen', 'darkorange', 'darkorchid', 'darkred',
'darksalmon', 'darkseagreen', 'darkslateblue', 'darkslategray',
'darkslategrey', 'darkturquoise', 'darkviolet', 'deeppink',
'deepskyblue', 'dimgray', 'dimgrey', 'dodgerblue', 'firebrick',
'floralwhite', 'forestgreen', 'fuchsia', 'gainsboro',
'ghostwhite', 'gold', 'goldenrod', 'gray', 'grey', 'green',
'greenyellow', 'honeydew', 'hotpink', 'indianred', 'indigo',
'ivory', 'khaki', 'lavender', 'lavenderblush', 'lawngreen',
'lemonchiffon', 'lightblue', 'lightcoral', 'lightcyan',
'lightgoldenrodyellow', 'lightgray', 'lightgrey', 'lightgreen',
'lightpink', 'lightsalmon', 'lightseagreen', 'lightskyblue',
'lightslategray', 'lightslategrey', 'lightsteelblue', 'lightyellow',
'lime', 'limegreen', 'linen', 'magenta', 'maroon',
'mediumaquamarine', 'mediumblue', 'mediumorchid', 'mediumpurple',
'mediumseagreen', 'mediumslateblue', 'mediumspringgreen',
'mediumturquoise', 'mediumvioletred', 'midnightblue', 'mintcream',
'mistyrose', 'moccasin', 'navajowhite', 'navy', 'oldlace', 'olive',
'olivedrab', 'orange', 'orangered', 'orchid', 'palegoldenrod',
'palegreen', 'paleturquoise', 'palevioletred', 'papayawhip',
'peachpuff', 'peru', 'pink', 'plum', 'powderblue', 'purple', 'red',
'rosybrown', 'royalblue', 'saddlebrown', 'salmon', 'sandybrown',
'seagreen', 'seashell', 'sienna', 'silver', 'skyblue', 'slateblue',
'slategray', 'slategrey', 'snow', 'springgreen', 'steelblue', 'tan',
'teal', 'thistle', 'tomato', 'turquoise', 'violet', 'wheat', 'white',
'whitesmoke', 'yellow', 'yellowgreen'
);
if (preg_match('/^#?([[:xdigit:]]{3}){1,2}$/', $colour)) {
return true;
} else if (in_array(strtolower($colour), $colournames)) {
return true;
}
return false;
}
/**
* Helper function that 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;
}
/**
* Helper function that returns the course id for this element.
*
* @param int $elementid The element id
* @return int The course id
*/
public static function get_courseid($elementid) {
global $DB, $SITE;
$sql = "SELECT course
FROM {customcert} c
INNER JOIN {customcert_pages} cp
ON c.templateid = cp.templateid
INNER JOIN {customcert_elements} ce
ON cp.id = ce.pageid
WHERE ce.id = :elementid";
// Check if there is a course associated with this element.
if ($course = $DB->get_record_sql($sql, array('elementid' => $elementid))) {
return $course->course;
} else { // Must be in a site template.
return $SITE->id;
}
}
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/**
* Helper function that returns the context for this element.
*
* @param int $elementid The element id
* @return \context The context
*/
public static function get_context(int $elementid) : \context {
global $DB;
$sql = "SELECT ct.contextid
FROM {customcert_templates} ct
INNER JOIN {customcert_pages} cp
ON ct.id = cp.templateid
INNER JOIN {customcert_elements} ce
ON cp.id = ce.pageid
WHERE ce.id = :elementid";
$contextid = $DB->get_field_sql($sql, array('elementid' => $elementid), MUST_EXIST);
return \context::instance_by_id($contextid);
}
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/**
* Return the list of possible elements to add.
*
* @return array the list of element types that can be used.
*/
public static function get_available_element_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)) {
// Additionally, check if the user is allowed to add the element at all.
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if ($classname::can_add()) {
$component = "customcertelement_{$foldername}";
$options[$foldername] = get_string('pluginname', $component);
}
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}
}
}
\core_collator::asort($options);
return $options;
}
/**
* Helper function to return all the grades items for a given course.
*
* @param \stdClass $course The course we want to return the grade items for
* @return array the array of gradeable items in the course
*/
public static function get_grade_items($course) {
global $DB;
// Array to store the grade items.
$modules = array();
// Collect course modules data.
$modinfo = get_fast_modinfo($course);
$mods = $modinfo->get_cms();
$sections = $modinfo->get_section_info_all();
// Create the section label depending on course format.
$sectionlabel = get_string('section');
if ($course->format == 'topics') {
$sectionlabel = get_string('topic');
} else if ($course->format == 'weeks') {
$sectionlabel = get_string('week');
}
// Loop through each course section.
for ($i = 0; $i <= count($sections) - 1; $i++) {
// Confirm the index exists, should always be true.
if (isset($sections[$i])) {
// Get the individual section.
$section = $sections[$i];
// Get the mods for this section.
$sectionmods = explode(",", $section->sequence);
// Loop through the section mods.
foreach ($sectionmods as $sectionmod) {
// Should never happen unless DB is borked.
if (empty($mods[$sectionmod])) {
continue;
}
$mod = $mods[$sectionmod];
$instance = $DB->get_record($mod->modname, array('id' => $mod->instance));
// Get the grade items for this activity.
if ($gradeitems = grade_get_grade_items_for_activity($mod)) {
$moditem = grade_get_grades($course->id, 'mod', $mod->modname, $mod->instance);
$gradeitem = reset($moditem->items);
if (isset($gradeitem->grademax)) {
$modules[$mod->id] = $sectionlabel . ' ' . $section->section . ' : ' . $instance->name;
}
}
}
}
}
if ($gradeitems = \grade_item::fetch_all(['courseid' => $course->id])) {
$arrgradeitems = [];
foreach ($gradeitems as $gi) {
// Skip the course and mod items since we already have them.
if ($gi->itemtype == 'mod' || $gi->itemtype == 'course') {
continue;
}
$arrgradeitems['gradeitem:' . $gi->id] = get_string('gradeitem', 'grades') . ' : ' . $gi->get_name(true);
}
// Alphabetise this.
asort($arrgradeitems);
// Merge results.
$modules = $modules + $arrgradeitems;
}
return $modules;
}
/**
* Helper function to return the grade information for a course for a specified user.
*
* @param int $courseid
* @param int $gradeformat
* @param int $userid
* @return grade_information|bool the grade information, or false if there is none.
*/
public static function get_course_grade_info($courseid, $gradeformat, $userid) {
$courseitem = \grade_item::fetch_course_item($courseid);
if (!$courseitem) {
return false;
}
$grade = new \grade_grade(array('itemid' => $courseitem->id, 'userid' => $userid));
return new grade_information(
$courseitem->get_name(),
$grade->finalgrade,
grade_format_gradevalue($grade->finalgrade, $courseitem, true, $gradeformat),
$grade->get_dategraded()
);
}
/**
* Helper function to return the grade information for a module for a specified user.
*
* @param int $cmid
* @param int $gradeformat
* @param int $userid
* @return grade_information|bool the grade information, or false if there is none.
*/
public static function get_mod_grade_info($cmid, $gradeformat, $userid) {
global $DB;
if (!$cm = $DB->get_record('course_modules', array('id' => $cmid))) {
return false;
}
if (!$module = $DB->get_record('modules', array('id' => $cm->module))) {
return false;
}
$params = [
'itemtype' => 'mod',
'itemmodule' => $module->name,
'iteminstance' => $cm->instance,
'courseid' => $cm->course,
'itemnumber' => 0
];
$gradeitem = \grade_item::fetch($params);
if (empty($gradeitem)) {
return false;
}
$grade = grade_get_grades(
$cm->course,
'mod',
$module->name,
$cm->instance,
$userid
);
if (!isset($grade->items[0]->grades[$userid])) {
return false;
}
$gradebookgrade = $grade->items[0]->grades[$userid];
$dategraded = null;
if (!empty($gradebookgrade->dategraded)) {
$dategraded = $gradebookgrade->dategraded;
}
$displaygrade = grade_format_gradevalue($gradebookgrade->grade, $gradeitem, true, $gradeformat);
return new grade_information(
$gradeitem->get_name(),
$gradebookgrade->grade,
$displaygrade,
$dategraded
);
}
/**
* Helper function to return the grade information for a grade item for a specified user.
*
* @param int $gradeitemid
* @param int $gradeformat
* @param int $userid
* @return grade_information|bool the grade information, or false if there is none.
*/
public static function get_grade_item_info($gradeitemid, $gradeformat, $userid) {
if (!$gradeitem = \grade_item::fetch(['id' => $gradeitemid])) {
return false;
}
$grade = new \grade_grade(array('itemid' => $gradeitem->id, 'userid' => $userid));
return new grade_information(
$gradeitem->get_name(),
$grade->finalgrade,
grade_format_gradevalue($grade->finalgrade, $gradeitem, true, $gradeformat),
$grade->get_dategraded()
);
}
}