moodle-mod_htmlcert/elements/image/lib.php
2013-06-06 11:14:06 +08:00

193 lines
7 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/>.
/**
* The image elements core interaction API.
*
* @package customcertelement_image
* @copyright Mark Nelson <markn@moodle.com>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
defined('MOODLE_INTERNAL') || die('Direct access to this script is forbidden.');
require_once($CFG->dirroot . '/mod/customcert/elements/element.class.php');
class customcert_element_image extends customcert_element_base {
/**
* This function is responsible for adding the element for the first time
* to the database when no data has yet been specified, default values set.
* Can be overridden if more functionality is needed.
*
* @param string $element the name of the element
* @param int $pageid the page id we are saving it to
*/
public static function add_element($element, $pageid) {
global $DB;
$data = customcert_element_base::get_required_attributes($element, $pageid);
$data->width = '0';
$data->height = '0';
$data->posx = '0';
$data->posy = '0';
$DB->insert_record('customcert_elements', $data);
}
/**
* This function renders the form elements when adding a customcert element.
*
* @param stdClass $mform the edit_form instance.
*/
public function render_form_elements($mform) {
$image = '';
$width = '0';
$height = '0';
// Check if there is any data for this element.
if (!empty($this->element->data)) {
$imageinfo = json_decode($this->element->data);
$image = $imageinfo->pathnamehash;
$width = $imageinfo->width;
$height = $imageinfo->height;
}
$mform->addElement('select', 'image_' . $this->element->id, get_string('image', 'customcertelement_image'), self::get_images());
$mform->setDefault('image_' . $this->element->id, $image);
$mform->addElement('text', 'imagewidth_' . $this->element->id, get_string('width', 'customcertelement_image'), array('size' => 10));
$mform->setType('imagewidth_' . $this->element->id, PARAM_INT);
$mform->setDefault('imagewidth_' . $this->element->id, $width);
$mform->addHelpButton('imagewidth_' . $this->element->id, 'width', 'customcertelement_image');
$mform->addElement('text', 'imageheight_' . $this->element->id, get_string('height', 'customcertelement_image'), array('size' => 10));
$mform->setType('imageheight_' . $this->element->id, PARAM_INT);
$mform->setDefault('imageheight_' . $this->element->id, $height);
$mform->addHelpButton('imageheight_' . $this->element->id, 'height', 'customcertelement_image');
parent::render_form_elements_position($mform);
}
/**
* 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();
// Get width.
$width = 'imagewidth_' . $this->element->id;
// Check if width is not set, or not numeric or less than 0.
if ((!isset($data[$width])) || (!is_numeric($data[$width])) || ($data[$width] < 0)) {
$errors[$width] = get_string('invalidwidth', 'customcertelement_image');
}
// Get height.
$height = 'imageheight_' . $this->element->id;
// Check if height is not set, or not numeric or less than 0.
if ((!isset($data[$height])) || (!is_numeric($data[$height])) || ($data[$height] < 0)) {
$errors[$height] = get_string('invalidheight', 'customcertelement_image');
}
// Validate the position.
$errors += $this->validate_form_elements_position($data);
return $errors;
}
/**
* 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) {
// Get the date item and format from the form.
$image = 'image_' . $this->element->id;
$image = $data->$image;
$width = 'imagewidth_' . $this->element->id;
$width = $data->$width;
$height = 'imageheight_' . $this->element->id;
$height = $data->$height;
// Array of data we will be storing in the database.
$arrtostore = array(
'pathnamehash' => $image,
'width' => $width,
'height' => $height
);
return json_encode($arrtostore);
}
/**
* Handles rendering the element on the pdf.
*
* @param stdClass $pdf the pdf object
* @param int $userid
*/
public function render($pdf, $userid) {
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);
$image = $imageinfo->pathnamehash;
$width = $imageinfo->width;
$height = $imageinfo->height;
// Get the image.
$fs = get_file_storage();
if ($file = $fs->get_file_by_hash($image)) {
$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, $width, $height);
}
}
/**
* Return the list of possible images to use.
*
* @return array the list of images that can be used.
*/
public static function get_images() {
// Create file storage object.
$fs = get_file_storage();
// The array used to store the images.
$arrfiles = array();
$arrfiles[0] = get_string('noimage', 'customcert');
if ($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();
}
}
return $arrfiles;
}
}