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/>.
/**
* 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();
/**
* Class helper.
*
* Provides useful functions related to elements.
*/
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, $content) {
list($font, $attr) = \mod_customcert\element_helper::get_font($element);
$pdf->setFont($font, $attr, $element->size);
$fontcolour = \TCPDF_COLORS::convertHTMLColorToDec($element->colour, $fontcolour);
$pdf->SetTextColor($fontcolour['R'], $fontcolour['G'], $fontcolour['B']);
$x = $element->posx;
$y = $element->posy;
$w = $element->width;
$refpoint = $element->refpoint;
$actualwidth = $pdf->GetStringWidth($content);
if ($w and $w < $actualwidth) {
$actualwidth = $w;
}
switch ($refpoint) {
case self::CUSTOMCERT_REF_POINT_TOPRIGHT:
$x = $element->posx - $actualwidth;
if ($x < 0) {
$x = 0;
$w = $element->posx;
} else {
$w = $actualwidth;
}
break;
case self::CUSTOMCERT_REF_POINT_TOPCENTER:
$x = $element->posx - $actualwidth / 2;
if ($x < 0) {
$x = 0;
$w = $element->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, $content) {
list($font, $attr) = \mod_customcert\element_helper::get_font($element);
$fontstyle = 'font-family: ' . $font;
if (strpos($attr, 'B') !== false) {
$fontstyle .= ': font-weight: bold';
}
if (strpos($attr, 'I') !== false) {
$fontstyle .= ': font-style: italic';
}
$style = $fontstyle . '; color: ' . $element->colour . '; font-size: ' . $element->size . 'pt';
return \html_writer::tag('span', $content, array('style' => $style));
}
/**
* Helper function to render the font elements.
*
* @param \mod_customcert\edit_element_form $mform the edit_form instance.
*/
public static function render_form_element_font($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', 'size', get_string('fontsize', 'customcert'), \mod_customcert\certificate::get_font_sizes());
$mform->setType('size', PARAM_INT);
$mform->setDefault('size', 12);
$mform->addHelpButton('size', 'fontsize', 'customcert');
}
/**
* Helper function to render the colour elements.
*
* @param \mod_customcert\edit_element_form $mform the edit_form instance.
*/
public static function render_form_element_colour($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 \mod_customcert\edit_element_form $mform the edit_form instance.
*/
public static function render_form_element_position($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');
$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');
$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) {
$errors = array();
// Validate the colour.
if (!\mod_customcert\element_helper::validate_colour($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) {
$errors = array();
// Check if width is less than 0.
if (isset($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->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;
}
}