310 lines
12 KiB
PHP
310 lines
12 KiB
PHP
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<?php
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// This file is part of the customcert module for Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
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/**
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* Provides useful functions related to elements.
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*
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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
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*/
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namespace mod_customcert;
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defined('MOODLE_INTERNAL') || die();
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/**
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* Class helper.
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*
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* Provides useful functions related to elements.
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*/
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class element_helper {
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/**
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* @var int the top-left of element
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*/
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const CUSTOMCERT_REF_POINT_TOPLEFT = 0;
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/**
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* @var int the top-center of element
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*/
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const CUSTOMCERT_REF_POINT_TOPCENTER = 1;
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/**
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* @var int the top-left of element
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*/
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const CUSTOMCERT_REF_POINT_TOPRIGHT = 2;
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/**
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* Common behaviour for rendering specified content on the pdf.
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*
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* @param \pdf $pdf the pdf object
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* @param \mod_customcert\element $element the customcert element
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* @param string $content the content to render
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*/
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public static function render_content($pdf, $element, $content) {
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list($font, $attr) = \mod_customcert\element_helper::get_font($element);
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$pdf->setFont($font, $attr, $element->size);
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$fontcolour = \TCPDF_COLORS::convertHTMLColorToDec($element->colour, $fontcolour);
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$pdf->SetTextColor($fontcolour['R'], $fontcolour['G'], $fontcolour['B']);
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$x = $element->posx;
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$y = $element->posy;
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$w = $element->width;
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$refpoint = $element->refpoint;
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$actualwidth = $pdf->GetStringWidth($content);
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if ($w and $w < $actualwidth) {
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$actualwidth = $w;
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}
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switch ($refpoint) {
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case self::CUSTOMCERT_REF_POINT_TOPRIGHT:
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$x = $element->posx - $actualwidth;
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if ($x < 0) {
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$x = 0;
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$w = $element->posx;
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} else {
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$w = $actualwidth;
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}
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break;
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case self::CUSTOMCERT_REF_POINT_TOPCENTER:
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$x = $element->posx - $actualwidth / 2;
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if ($x < 0) {
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$x = 0;
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$w = $element->posx * 2;
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} else {
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$w = $actualwidth;
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}
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break;
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}
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if ($w) {
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$w += 0.0001;
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}
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$pdf->setCellPaddings(0, 0, 0, 0);
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$pdf->writeHTMLCell($w, 0, $x, $y, $content, 0, 0, false, true);
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}
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/**
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* Common behaviour for rendering specified content on the drag and drop page.
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*
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* @param \mod_customcert\element $element the customcert element
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* @param string $content the content to render
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* @return string the html
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*/
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public static function render_html_content($element, $content) {
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list($font, $attr) = \mod_customcert\element_helper::get_font($element);
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$fontstyle = 'font-family: ' . $font;
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if (strpos($attr, 'B') !== false) {
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$fontstyle .= ': font-weight: bold';
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}
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if (strpos($attr, 'I') !== false) {
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$fontstyle .= ': font-style: italic';
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}
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$style = $fontstyle . '; color: ' . $element->colour . '; font-size: ' . $element->size . 'pt';
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return \html_writer::tag('span', $content, array('style' => $style));
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}
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/**
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* Helper function to render the font elements.
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*
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* @param \mod_customcert\edit_element_form $mform the edit_form instance.
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*/
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public static function render_form_element_font($mform) {
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$mform->addElement('select', 'font', get_string('font', 'customcert'), \mod_customcert\certificate::get_fonts());
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$mform->setType('font', PARAM_TEXT);
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$mform->setDefault('font', 'times');
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$mform->addHelpButton('font', 'font', 'customcert');
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$mform->addElement('select', 'size', get_string('fontsize', 'customcert'), \mod_customcert\certificate::get_font_sizes());
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$mform->setType('size', PARAM_INT);
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$mform->setDefault('size', 12);
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$mform->addHelpButton('size', 'fontsize', 'customcert');
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}
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/**
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* Helper function to render the colour elements.
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*
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* @param \mod_customcert\edit_element_form $mform the edit_form instance.
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*/
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public static function render_form_element_colour($mform) {
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$mform->addElement('customcert_colourpicker', 'colour', get_string('fontcolour', 'customcert'));
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$mform->setType('colour', PARAM_RAW); // Need to validate that this is a valid colour.
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$mform->setDefault('colour', '#000000');
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$mform->addHelpButton('colour', 'fontcolour', 'customcert');
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}
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/**
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* Helper function to render the position elements.
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*
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* @param \mod_customcert\edit_element_form $mform the edit_form instance.
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*/
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public static function render_form_element_position($mform) {
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$mform->addElement('text', 'width', get_string('elementwidth', 'customcert'), array('size' => 10));
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$mform->setType('width', PARAM_INT);
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$mform->setDefault('width', 0);
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$mform->addHelpButton('width', 'elementwidth', 'customcert');
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$refpointoptions = array();
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$refpointoptions[self::CUSTOMCERT_REF_POINT_TOPLEFT] = get_string('topleft', 'customcert');
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$refpointoptions[self::CUSTOMCERT_REF_POINT_TOPCENTER] = get_string('topcenter', 'customcert');
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$refpointoptions[self::CUSTOMCERT_REF_POINT_TOPRIGHT] = get_string('topright', 'customcert');
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$mform->addElement('select', 'refpoint', get_string('refpoint', 'customcert'), $refpointoptions);
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$mform->setType('refpoint', PARAM_INT);
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$mform->setDefault('refpoint', self::CUSTOMCERT_REF_POINT_TOPCENTER);
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$mform->addHelpButton('refpoint', 'refpoint', 'customcert');
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}
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/**
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* Helper function to performs validation on the colour element.
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*
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* @param array $data the submitted data
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* @return array the validation errors
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*/
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public static function validate_form_element_colour($data) {
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$errors = array();
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// Validate the colour.
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if (!\mod_customcert\element_helper::validate_colour($data['colour'])) {
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$errors['colour'] = get_string('invalidcolour', 'customcert');
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}
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return $errors;
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}
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/**
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* Helper function to performs validation on the position elements.
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*
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* @param array $data the submitted data
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* @return array the validation errors
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*/
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public static function validate_form_element_position($data) {
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$errors = array();
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// Check if width is less than 0.
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if (isset($data['width']) && $data['width'] < 0) {
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$errors['width'] = get_string('invalidelementwidth', 'customcert');
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}
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return $errors;
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}
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/**
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* Returns the font used for this element.
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*
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* @param \mod_customcert\element $element the customcert element
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* @return array the font and font attributes
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*/
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public static function get_font($element) {
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// Variable for the font.
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$font = $element->font;
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// Get the last two characters of the font name.
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$fontlength = strlen($font);
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$lastchar = $font[$fontlength - 1];
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$secondlastchar = $font[$fontlength - 2];
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// The attributes of the font.
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$attr = '';
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// Check if the last character is 'i'.
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if ($lastchar == 'i') {
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// Remove the 'i' from the font name.
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$font = substr($font, 0, -1);
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// Check if the second last char is b.
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if ($secondlastchar == 'b') {
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// Remove the 'b' from the font name.
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$font = substr($font, 0, -1);
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$attr .= 'B';
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}
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$attr .= 'I';
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} else if ($lastchar == 'b') {
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// Remove the 'b' from the font name.
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$font = substr($font, 0, -1);
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$attr .= 'B';
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}
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return array($font, $attr);
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}
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/**
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* Validates the colour selected.
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*
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* @param string $colour
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* @return bool returns true if the colour is valid, false otherwise
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*/
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public static function validate_colour($colour) {
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// List of valid HTML colour names.
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$colournames = array(
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'aliceblue', 'antiquewhite', 'aqua', 'aquamarine', 'azure',
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'beige', 'bisque', 'black', 'blanchedalmond', 'blue',
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'blueviolet', 'brown', 'burlywood', 'cadetblue', 'chartreuse',
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'chocolate', 'coral', 'cornflowerblue', 'cornsilk', 'crimson',
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'cyan', 'darkblue', 'darkcyan', 'darkgoldenrod', 'darkgray',
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'darkgrey', 'darkgreen', 'darkkhaki', 'darkmagenta',
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'darkolivegreen', 'darkorange', 'darkorchid', 'darkred',
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'darksalmon', 'darkseagreen', 'darkslateblue', 'darkslategray',
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'darkslategrey', 'darkturquoise', 'darkviolet', 'deeppink',
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'deepskyblue', 'dimgray', 'dimgrey', 'dodgerblue', 'firebrick',
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'floralwhite', 'forestgreen', 'fuchsia', 'gainsboro',
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'ghostwhite', 'gold', 'goldenrod', 'gray', 'grey', 'green',
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'greenyellow', 'honeydew', 'hotpink', 'indianred', 'indigo',
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'ivory', 'khaki', 'lavender', 'lavenderblush', 'lawngreen',
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'lemonchiffon', 'lightblue', 'lightcoral', 'lightcyan',
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'lightgoldenrodyellow', 'lightgray', 'lightgrey', 'lightgreen',
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'lightpink', 'lightsalmon', 'lightseagreen', 'lightskyblue',
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'lightslategray', 'lightslategrey', 'lightsteelblue', 'lightyellow',
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'lime', 'limegreen', 'linen', 'magenta', 'maroon',
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'mediumaquamarine', 'mediumblue', 'mediumorchid', 'mediumpurple',
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'mediumseagreen', 'mediumslateblue', 'mediumspringgreen',
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'mediumturquoise', 'mediumvioletred', 'midnightblue', 'mintcream',
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'mistyrose', 'moccasin', 'navajowhite', 'navy', 'oldlace', 'olive',
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'olivedrab', 'orange', 'orangered', 'orchid', 'palegoldenrod',
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'palegreen', 'paleturquoise', 'palevioletred', 'papayawhip',
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'peachpuff', 'peru', 'pink', 'plum', 'powderblue', 'purple', 'red',
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'rosybrown', 'royalblue', 'saddlebrown', 'salmon', 'sandybrown',
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'seagreen', 'seashell', 'sienna', 'silver', 'skyblue', 'slateblue',
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'slategray', 'slategrey', 'snow', 'springgreen', 'steelblue', 'tan',
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'teal', 'thistle', 'tomato', 'turquoise', 'violet', 'wheat', 'white',
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'whitesmoke', 'yellow', 'yellowgreen'
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);
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if (preg_match('/^#?([[:xdigit:]]{3}){1,2}$/', $colour)) {
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return true;
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} else if (in_array(strtolower($colour), $colournames)) {
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return true;
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}
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return false;
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}
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/**
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* Helper function that returns the sequence on a specified customcert page for a
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* newly created element.
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*
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* @param int $pageid the id of the page we are adding this element to
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* @return int the element number
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*/
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public static function get_element_sequence($pageid) {
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global $DB;
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// Set the sequence of the element we are creating.
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$sequence = 1;
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// Check if there already elements that exist, if so, overwrite value.
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$sql = "SELECT MAX(sequence) as maxsequence
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FROM {customcert_elements}
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WHERE pageid = :id";
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// Get the current max sequence on this page and add 1 to get the new sequence.
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if ($maxseq = $DB->get_record_sql($sql, array('id' => $pageid))) {
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$sequence = $maxseq->maxsequence + 1;
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}
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return $sequence;
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}
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}
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