moodle-mod-customcert/element/image/classes/element.php
2015-12-15 13:15:17 +08:00

266 lines
10 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/>.
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 {
private $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');
$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');
$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.
$errors += $this->validate_form_element_position($data);
return $errors;
}
/**
* Handles saving the form elements created by this element.
* Can be overridden if more functionality is needed.
*
* @param \stdClass $data the form data
*/
public function save_form_elements($data) {
global $COURSE;
// Handle file uploads.
customcert_upload_imagefiles($data->customcertimage, \context_course::instance($COURSE->id)->id);
parent::save_form_elements($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' => $data->width,
'height' => $data->height
);
return json_encode($arrtostore);
}
/**
* Handles rendering the element on the pdf.
*
* @param \pdf $pdf the pdf object
* @param bool $preview true if it is a preview, false otherwise
*/
public function render($pdf, $preview) {
global $CFG;
// If there is no element data, we have nothing to display.
if (empty($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)) {
$contenthash = $file->get_contenthash();
$l1 = $contenthash[0] . $contenthash[1];
$l2 = $contenthash[2] . $contenthash[3];
$location = $CFG->dataroot . '/filedir' . '/' . $l1 . '/' . $l2 . '/' . $contenthash;
$pdf->Image($location, $this->element->posx, $this->element->posy, $imageinfo->width, $imageinfo->height);
}
}
/**
* Render the element in html.
*
* This function is used to render the element when we are using the
* drag and drop interface to position it.
*/
public function render_html() {
// If there is no element data, we have nothing to display.
if (empty($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 $COURSE;
// Set the image, width and height for this element.
if (!empty($this->element->data)) {
$imageinfo = json_decode($this->element->data);
$this->element->image = $imageinfo->pathnamehash;
$this->element->width = $imageinfo->width;
$this->element->height = $imageinfo->height;
}
// Editing existing instance - copy existing files into draft area.
$draftitemid = file_get_submitted_draft_itemid('customcertimage');
file_prepare_draft_area($draftitemid, \context_course::instance($COURSE->id)->id, 'mod_customcert', 'image', 0, $this->filemanageroptions);
$element = $mform->getElement('customcertimage');
$element->setValue($draftitemid);
parent::definition_after_data($mform);
}
/**
* 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;
}
}