moodle-mod-customcert/element/image/classes/element.php
Mark Nelson 48c83d34df Loading templates copies system images to the course (#298)
Before it would just reference the system images. However, this meant
backup/restore was broken as it did not include the images the template
was using.
2020-04-17 16:52:04 +02:00

447 lines
16 KiB
PHP

<?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/>.
/**
* This file contains the customcert element image's core interaction API.
*
* @package customcertelement_image
* @copyright 2013 Mark Nelson <markn@moodle.com>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
namespace customcertelement_image;
defined('MOODLE_INTERNAL') || die();
/**
* The customcert element image's core interaction API.
*
* @package customcertelement_image
* @copyright 2013 Mark Nelson <markn@moodle.com>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class element extends \mod_customcert\element {
/**
* @var array The file manager options.
*/
protected $filemanageroptions = array();
/**
* Constructor.
*
* @param \stdClass $element the element data
*/
public function __construct($element) {
global $COURSE;
$this->filemanageroptions = array(
'maxbytes' => $COURSE->maxbytes,
'subdirs' => 1,
'accepted_types' => 'image'
);
parent::__construct($element);
}
/**
* This function renders the form elements when adding a customcert element.
*
* @param \MoodleQuickForm $mform the edit_form instance
*/
public function render_form_elements($mform) {
$mform->addElement('select', 'fileid', get_string('image', 'customcertelement_image'), self::get_images());
$mform->addElement('text', 'width', get_string('width', 'customcertelement_image'), array('size' => 10));
$mform->setType('width', PARAM_INT);
$mform->setDefault('width', 0);
$mform->addHelpButton('width', 'width', 'customcertelement_image');
$mform->addElement('text', 'height', get_string('height', 'customcertelement_image'), array('size' => 10));
$mform->setType('height', PARAM_INT);
$mform->setDefault('height', 0);
$mform->addHelpButton('height', 'height', 'customcertelement_image');
$alphachannelvalues = [
'0' => 0,
'0.1' => 0.1,
'0.2' => 0.2,
'0.3' => 0.3,
'0.4' => 0.4,
'0.5' => 0.5,
'0.6' => 0.6,
'0.7' => 0.7,
'0.8' => 0.8,
'0.9' => 0.9,
'1' => 1
];
$mform->addElement('select', 'alphachannel', get_string('alphachannel', 'customcertelement_image'), $alphachannelvalues);
$mform->setType('alphachannel', PARAM_FLOAT);
$mform->setDefault('alphachannel', 1);
$mform->addHelpButton('alphachannel', 'alphachannel', 'customcertelement_image');
if (get_config('customcert', 'showposxy')) {
\mod_customcert\element_helper::render_form_element_position($mform);
}
$mform->addElement('filemanager', 'customcertimage', get_string('uploadimage', 'customcert'), '',
$this->filemanageroptions);
}
/**
* Performs validation on the element values.
*
* @param array $data the submitted data
* @param array $files the submitted files
* @return array the validation errors
*/
public function validate_form_elements($data, $files) {
// Array to return the errors.
$errors = array();
// Check if width is not set, or not numeric or less than 0.
if ((!isset($data['width'])) || (!is_numeric($data['width'])) || ($data['width'] < 0)) {
$errors['width'] = get_string('invalidwidth', 'customcertelement_image');
}
// Check if height is not set, or not numeric or less than 0.
if ((!isset($data['height'])) || (!is_numeric($data['height'])) || ($data['height'] < 0)) {
$errors['height'] = get_string('invalidheight', 'customcertelement_image');
}
// Validate the position.
if (get_config('customcert', 'showposxy')) {
$errors += \mod_customcert\element_helper::validate_form_element_position($data);
}
return $errors;
}
/**
* Handles saving the form elements created by this element.
* Can be overridden if more functionality is needed.
*
* @param \stdClass $data the form data
* @return bool true of success, false otherwise.
*/
public function save_form_elements($data) {
global $COURSE, $SITE;
// Set the context.
if ($COURSE->id == $SITE->id) {
$context = \context_system::instance();
} else {
$context = \context_course::instance($COURSE->id);
}
// Handle file uploads.
\mod_customcert\certificate::upload_files($data->customcertimage, $context->id);
return parent::save_form_elements($data);
}
/**
* This will handle how form data will be saved into the data column in the
* customcert_elements table.
*
* @param \stdClass $data the form data
* @return string the json encoded array
*/
public function save_unique_data($data) {
$arrtostore = [
'width' => !empty($data->width) ? (int) $data->width : 0,
'height' => !empty($data->height) ? (int) $data->height : 0
];
if (isset($data->alphachannel)) {
$arrtostore['alphachannel'] = (float) $data->alphachannel;
}
if (!empty($data->fileid)) {
// Array of data we will be storing in the database.
$fs = get_file_storage();
if ($file = $fs->get_file_by_id($data->fileid)) {
$arrtostore += [
'contextid' => $file->get_contextid(),
'filearea' => $file->get_filearea(),
'itemid' => $file->get_itemid(),
'filepath' => $file->get_filepath(),
'filename' => $file->get_filename(),
];
}
}
return json_encode($arrtostore);
}
/**
* Handles rendering the element on the pdf.
*
* @param \pdf $pdf the pdf object
* @param bool $preview true if it is a preview, false otherwise
* @param \stdClass $user the user we are rendering this for
*/
public function render($pdf, $preview, $user) {
// If there is no element data, we have nothing to display.
if (empty($this->get_data())) {
return;
}
$imageinfo = json_decode($this->get_data());
// If there is no file, we have nothing to display.
if (empty($imageinfo->filename)) {
return;
}
if ($file = $this->get_file()) {
$location = make_request_directory() . '/target';
$file->copy_content_to($location);
// Check if the alpha channel is set, if it is, use it.
if (isset($imageinfo->alphachannel)) {
$pdf->SetAlpha($imageinfo->alphachannel);
}
$mimetype = $file->get_mimetype();
if ($mimetype == 'image/svg+xml') {
$pdf->ImageSVG($location, $this->get_posx(), $this->get_posy(), $imageinfo->width, $imageinfo->height);
} else {
$pdf->Image($location, $this->get_posx(), $this->get_posy(), $imageinfo->width, $imageinfo->height);
}
// Restore to full opacity.
$pdf->SetAlpha(1);
}
}
/**
* Render the element in html.
*
* This function is used to render the element when we are using the
* drag and drop interface to position it.
*
* @return string the html
*/
public function render_html() {
// If there is no element data, we have nothing to display.
if (empty($this->get_data())) {
return '';
}
$imageinfo = json_decode($this->get_data());
// If there is no file, we have nothing to display.
if (empty($imageinfo->filename)) {
return '';
}
// Get the image.
$fs = get_file_storage();
if ($file = $fs->get_file($imageinfo->contextid, 'mod_customcert', $imageinfo->filearea, $imageinfo->itemid,
$imageinfo->filepath, $imageinfo->filename)) {
$url = \moodle_url::make_pluginfile_url($file->get_contextid(), 'mod_customcert', 'image', $file->get_itemid(),
$file->get_filepath(), $file->get_filename());
$fileimageinfo = $file->get_imageinfo();
$whratio = $fileimageinfo['width'] / $fileimageinfo['height'];
// The size of the images to use in the CSS style.
$style = '';
if ($imageinfo->width === 0 && $imageinfo->height === 0) {
$style .= 'width: ' . $fileimageinfo['width'] . 'px; ';
$style .= 'height: ' . $fileimageinfo['height'] . 'px';
} else if ($imageinfo->width === 0) { // Then the height must be set.
// We must get the width based on the height to keep the ratio.
$style .= 'width: ' . ($imageinfo->height * $whratio) . 'mm; ';
$style .= 'height: ' . $imageinfo->height . 'mm';
} else if ($imageinfo->height === 0) { // Then the width must be set.
$style .= 'width: ' . $imageinfo->width . 'mm; ';
// We must get the height based on the width to keep the ratio.
$style .= 'height: ' . ($imageinfo->width / $whratio) . 'mm';
} else { // Must both be set.
$style .= 'width: ' . $imageinfo->width . 'mm; ';
$style .= 'height: ' . $imageinfo->height . 'mm';
}
return \html_writer::tag('img', '', array('src' => $url, 'style' => $style));
}
}
/**
* Sets the data on the form when editing an element.
*
* @param \MoodleQuickForm $mform the edit_form instance
*/
public function definition_after_data($mform) {
global $COURSE, $SITE;
// Set the image, width, height and alpha channel for this element.
if (!empty($this->get_data())) {
$imageinfo = json_decode($this->get_data());
if (!empty($imageinfo->filename)) {
if ($file = $this->get_file()) {
$element = $mform->getElement('fileid');
$element->setValue($file->get_id());
}
}
if (isset($imageinfo->width) && $mform->elementExists('width')) {
$element = $mform->getElement('width');
$element->setValue($imageinfo->width);
}
if (isset($imageinfo->height) && $mform->elementExists('height')) {
$element = $mform->getElement('height');
$element->setValue($imageinfo->height);
}
if (isset($imageinfo->alphachannel) && $mform->elementExists('alphachannel')) {
$element = $mform->getElement('alphachannel');
$element->setValue($imageinfo->alphachannel);
}
}
// Set the context.
if ($COURSE->id == $SITE->id) {
$context = \context_system::instance();
} else {
$context = \context_course::instance($COURSE->id);
}
// Editing existing instance - copy existing files into draft area.
$draftitemid = file_get_submitted_draft_itemid('customcertimage');
file_prepare_draft_area($draftitemid, $context->id, 'mod_customcert', 'image', 0, $this->filemanageroptions);
$element = $mform->getElement('customcertimage');
$element->setValue($draftitemid);
parent::definition_after_data($mform);
}
/**
* This function is responsible for handling the restoration process of the element.
*
* We will want to update the file's pathname hash.
*
* @param \restore_customcert_activity_task $restore
*/
public function after_restore($restore) {
global $DB;
// Get the current data we have stored for this element.
$elementinfo = json_decode($this->get_data());
// Update the context.
$elementinfo->contextid = \context_course::instance($restore->get_courseid())->id;
// Encode again before saving.
$elementinfo = json_encode($elementinfo);
// Perform the update.
$DB->set_field('customcert_elements', 'data', $elementinfo, array('id' => $this->get_id()));
}
/**
* Fetch stored file.
*
* @return \stored_file|bool stored_file instance if exists, false if not
*/
public function get_file() {
$imageinfo = json_decode($this->get_data());
$fs = get_file_storage();
return $fs->get_file($imageinfo->contextid, 'mod_customcert', $imageinfo->filearea, $imageinfo->itemid,
$imageinfo->filepath, $imageinfo->filename);
}
/**
* Return the list of possible images to use.
*
* @return array the list of images that can be used
*/
public static function get_images() {
global $COURSE;
// Create file storage object.
$fs = get_file_storage();
// The array used to store the images.
$arrfiles = array();
// Loop through the files uploaded in the system context.
if ($files = $fs->get_area_files(\context_system::instance()->id, 'mod_customcert', 'image', false, 'filename', false)) {
foreach ($files as $hash => $file) {
$arrfiles[$file->get_id()] = get_string('systemimage', 'customcertelement_image', $file->get_filename());
}
}
// Loop through the files uploaded in the course context.
if ($files = $fs->get_area_files(\context_course::instance($COURSE->id)->id, 'mod_customcert', 'image', false,
'filename', false)) {
foreach ($files as $hash => $file) {
$arrfiles[$file->get_id()] = get_string('courseimage', 'customcertelement_image', $file->get_filename());
}
}
\core_collator::asort($arrfiles);
$arrfiles = array('0' => get_string('noimage', 'customcert')) + $arrfiles;
return $arrfiles;
}
/**
* This handles copying data from another element of the same type.
*
* @param \stdClass $data the form data
* @return bool returns true if the data was copied successfully, false otherwise
*/
public function copy_element($data) {
global $COURSE, $DB, $SITE;
$imagedata = json_decode($data->data);
// If we are in the site context we don't have to do anything, the images are already there.
if ($COURSE->id == $SITE->id) {
return true;
}
$context = \context_course::instance($COURSE->id);
// Copy files to new location.
$fs = get_file_storage();
$systemfiles = $fs->get_area_files(\context_system::instance()->id, 'mod_customcert', $imagedata->filearea,
$imagedata->itemid);
$fieldupdates = [
'contextid' => $context->id
];
foreach ($systemfiles as $systemfile) {
// We might have loaded this template already in this course.
if (!$storedfile = $fs->get_file(
$context->id,
'mod_customcert',
$systemfile->get_filearea(),
$systemfile->get_itemid(),
$systemfile->get_filepath(),
$systemfile->get_filename())
) {
$storedfile = $fs->create_file_from_storedfile($fieldupdates, $systemfile);
}
// Set the image to the copied file in the course.
$imagedata->fileid = $storedfile->get_id();
$DB->set_field('customcert_elements', 'data', $this->save_unique_data($imagedata), ['id' => $this->get_id()]);
}
return true;
}
}