moodle-mod_htmlcert/element/image/classes/element.php
2017-04-27 22:21:21 +08:00

344 lines
13 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 \mod_customcert\edit_element_form $mform the edit_form instance
*/
public function render_form_elements($mform) {
$mform->addElement('select', 'image', 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);
$mform->addHelpButton('height', 'height', 'customcertelement_image');
if (get_config('customcert', 'showposxy')) {
\mod_customcert\element_helper::render_form_element_position($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_imagefiles($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) {
// Array of data we will be storing in the database.
$arrtostore = array(
'pathnamehash' => $data->image,
'width' => (int) $data->width,
'height' => (int) $data->height
);
return json_encode($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->element->data)) {
return;
}
$imageinfo = json_decode($this->element->data);
// Get the image.
$fs = get_file_storage();
if ($file = $fs->get_file_by_hash($imageinfo->pathnamehash)) {
$location = make_request_directory() . '/target';
$file->copy_content_to($location);
$mimetype = $file->get_mimetype();
if ($mimetype == 'image/svg+xml') {
$pdf->ImageSVG($location, $this->element->posx, $this->element->posy, $imageinfo->width, $imageinfo->height);
} else {
$pdf->Image($location, $this->element->posx, $this->element->posy, $imageinfo->width, $imageinfo->height);
}
}
}
/**
* Render the element in html.
*
* This function is used to render the element when we are using the
* drag and drop interface to position it.
*
* @return string the html
*/
public function render_html() {
// If there is no element data, we have nothing to display.
if (empty($this->element->data)) {
return '';
}
$imageinfo = json_decode($this->element->data);
// Get the image.
$fs = get_file_storage();
if ($file = $fs->get_file_by_hash($imageinfo->pathnamehash)) {
$url = \moodle_url::make_pluginfile_url($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 \mod_customcert\edit_element_form $mform the edit_form instance
*/
public function definition_after_data($mform) {
global $COURSE, $SITE;
// Set the image, width and height for this element.
if (!empty($this->element->data)) {
$imageinfo = json_decode($this->element->data);
$this->element->image = $imageinfo->pathnamehash;
$this->element->width = $imageinfo->width;
$this->element->height = $imageinfo->height;
}
// Set the context.
if ($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 $DB;
// Check the files that have been processed in the backup file that belong to the custom certificate activity.
if ($files = $DB->get_records('backup_files_temp', array('backupid' => $restore->get_restoreid(),
'component' => 'mod_customcert', 'filearea' => 'image'))) {
// Get the current data we have stored for this element.
$elementinfo = json_decode($this->element->data);
// Create a file storage instance we are going to use to create pathname hashes.
$fs = get_file_storage();
// Loop through each of the files found and compare them with this element.
foreach ($files as $file) {
if ($fileinfo = \backup_controller_dbops::decode_backup_temp_info($file->info)) {
// Create the array to identify the image by.
$fileidentifier = [
$file->contextid,
'mod_customcert',
'image',
0,
$fileinfo->filepath,
$fileinfo->filename
];
$pathnamehash = $fs->get_pathname_hash(...$fileidentifier);
// Check if we found the image, if so we need to update the pathname hash.
if ($pathnamehash == $elementinfo->pathnamehash) {
// Change the context id to get the new hash.
$fileidentifier[0] = $file->newcontextid;
$newpathnamehash = $fs->get_pathname_hash(...$fileidentifier);
// Save the data now.
$datatosave = new \stdClass();
$datatosave->image = $newpathnamehash;
$datatosave->width = $elementinfo->width;
$datatosave->height = $elementinfo->height;
$DB->set_field('customcert_elements', 'data', self::save_unique_data($datatosave),
array('id' => $this->element->id));
}
}
}
}
}
/**
* 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) {
$arrfiles[$hash] = $file->get_filename();
}
}
// Loop through the files uploaded in the course context.
if ($files = $fs->get_area_files(\context_course::instance($COURSE->id)->id, 'mod_customcert', 'image', false,
'filename', false)) {
foreach ($files as $hash => $file) {
$arrfiles[$hash] = $file->get_filename();
}
}
\core_collator::asort($arrfiles);
$arrfiles = array_merge(array('0' => get_string('noimage', 'customcert')), $arrfiles);
return $arrfiles;
}
}