moodle-mod_htmlcert/classes/element.php
2021-10-25 17:22:23 +08:00

501 lines
14 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 base class for the customcert elements.
*
* @package mod_customcert
* @copyright 2013 Mark Nelson <markn@moodle.com>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
namespace mod_customcert;
defined('MOODLE_INTERNAL') || die();
/**
* Class element
*
* All customcert element plugins are based on this class.
*
* @package mod_customcert
* @copyright 2013 Mark Nelson <markn@moodle.com>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
abstract class element {
/**
* @var string The left alignment constant.
*/
const ALIGN_LEFT = 'L';
/**
* @var string The centered alignment constant.
*/
const ALIGN_CENTER = 'C';
/**
* @var string The right alignment constant.
*/
const ALIGN_RIGHT = 'R';
/**
* @var \stdClass $element The data for the element we are adding - do not use, kept for legacy reasons.
*/
protected $element;
/**
* @var int The id.
*/
protected $id;
/**
* @var int The page id.
*/
protected $pageid;
/**
* @var string The name.
*/
protected $name;
/**
* @var mixed The data.
*/
protected $data;
/**
* @var string The font name.
*/
protected $font;
/**
* @var int The font size.
*/
protected $fontsize;
/**
* @var string The font colour.
*/
protected $colour;
/**
* @var int The position x.
*/
protected $posx;
/**
* @var int The position y.
*/
protected $posy;
/**
* @var int The width.
*/
protected $width;
/**
* @var int The refpoint.
*/
protected $refpoint;
/**
* @var string The alignment.
*/
protected $alignment;
/**
* @var bool $showposxy Show position XY form elements?
*/
protected $showposxy;
/**
* @var edit_element_form Element edit form instance.
*/
private $editelementform;
/**
* Constructor.
*
* @param \stdClass $element the element data
*/
public function __construct($element) {
$showposxy = get_config('customcert', 'showposxy');
// Keeping this for legacy reasons so we do not break third-party elements.
$this->element = clone($element);
$this->id = $element->id;
$this->pageid = $element->pageid;
$this->name = $element->name;
$this->data = $element->data;
$this->font = $element->font;
$this->fontsize = $element->fontsize;
$this->colour = $element->colour;
$this->posx = $element->posx;
$this->posy = $element->posy;
$this->width = $element->width;
$this->refpoint = $element->refpoint;
$this->showposxy = isset($showposxy) && $showposxy;
$this->set_alignment(isset($element->alignment) ? $element->alignment : element::ALIGN_LEFT);
}
/**
* Returns the id.
*
* @return int
*/
public function get_id() {
return $this->id;
}
/**
* Returns the page id.
*
* @return int
*/
public function get_pageid() {
return $this->pageid;
}
/**
* Returns the name.
*
* @return int
*/
public function get_name() {
return $this->name;
}
/**
* Returns the data.
*
* @return mixed
*/
public function get_data() {
return $this->data;
}
/**
* Returns the font name.
*
* @return string
*/
public function get_font() {
return $this->font;
}
/**
* Returns the font size.
*
* @return int
*/
public function get_fontsize() {
return $this->fontsize;
}
/**
* Returns the font colour.
*
* @return string
*/
public function get_colour() {
return $this->colour;
}
/**
* Returns the position x.
*
* @return int
*/
public function get_posx() {
return $this->posx;
}
/**
* Returns the position y.
*
* @return int
*/
public function get_posy() {
return $this->posy;
}
/**
* Returns the width.
*
* @return int
*/
public function get_width() {
return $this->width;
}
/**
* Returns the refpoint.
*
* @return int
*/
public function get_refpoint() {
return $this->refpoint;
}
/**
* Returns the alignment.
*
* @return string The current alignment value.
*/
public function get_alignment() {
return isset($this->alignment) ? $this->alignment : element::ALIGN_LEFT;
}
/**
* Sets the alignment.
*
* @param string $alignment The new alignment.
*
* @throws InvalidArgumentException if the provided new alignment is not valid.
*/
protected function set_alignment($alignment) {
$valid_values = array(element::ALIGN_LEFT, element::ALIGN_CENTER, element::ALIGN_RIGHT);
if (!in_array($alignment, $valid_values)) {
throw new \InvalidArgumentException("'$alignment' is not a valid alignment value. It has to be one of " . implode(', ', $valid_values));
}
$this->alignment = $alignment;
}
/**
* This function renders the form elements when adding a customcert element.
* Can be overridden if more functionality is needed.
*
* @param \MoodleQuickForm $mform the edit_form instance.
*/
public function render_form_elements($mform) {
// Render the common elements.
element_helper::render_form_element_font($mform);
element_helper::render_form_element_colour($mform);
if ($this->showposxy) {
element_helper::render_form_element_position($mform);
}
element_helper::render_form_element_width($mform);
element_helper::render_form_element_refpoint($mform);
element_helper::render_form_element_alignment($mform);
}
/**
* Sets the data on the form when editing an element.
* Can be overridden if more functionality is needed.
*
* @param edit_element_form $mform the edit_form instance
*/
public function definition_after_data($mform) {
// Loop through the properties of the element and set the values
// of the corresponding form element, if it exists.
$properties = [
'name' => $this->name,
'font' => $this->font,
'fontsize' => $this->fontsize,
'colour' => $this->colour,
'posx' => $this->posx,
'posy' => $this->posy,
'width' => $this->width,
'refpoint' => $this->refpoint,
'alignment' => $this->get_alignment()
];
foreach ($properties as $property => $value) {
if (!is_null($value) && $mform->elementExists($property)) {
$element = $mform->getElement($property);
$element->setValue($value);
}
}
}
/**
* Performs validation on the element values.
* Can be overridden if more functionality is needed.
*
* @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();
// Common validation methods.
$errors += element_helper::validate_form_element_colour($data);
if ($this->showposxy) {
$errors += element_helper::validate_form_element_position($data);
}
$errors += element_helper::validate_form_element_width($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 $DB;
// Get the data from the form.
$element = new \stdClass();
$element->name = $data->name;
$element->data = $this->save_unique_data($data);
$element->font = (isset($data->font)) ? $data->font : null;
$element->fontsize = (isset($data->fontsize)) ? $data->fontsize : null;
$element->colour = (isset($data->colour)) ? $data->colour : null;
if ($this->showposxy) {
$element->posx = (isset($data->posx)) ? $data->posx : null;
$element->posy = (isset($data->posy)) ? $data->posy : null;
}
$element->width = (isset($data->width)) ? $data->width : null;
$element->refpoint = (isset($data->refpoint)) ? $data->refpoint : null;
$element->alignment = (isset($data->alignment)) ? $data->alignment : element::ALIGN_LEFT;
$element->timemodified = time();
// Check if we are updating, or inserting a new element.
if (!empty($this->id)) { // Must be updating a record in the database.
$element->id = $this->id;
return $DB->update_record('customcert_elements', $element);
} else { // Must be adding a new one.
$element->element = $data->element;
$element->pageid = $data->pageid;
$element->sequence = \mod_customcert\element_helper::get_element_sequence($element->pageid);
$element->timecreated = time();
return $DB->insert_record('customcert_elements', $element, false);
}
}
/**
* This will handle how form data will be saved into the data column in the
* customcert_elements table.
* Can be overridden if more functionality is needed.
*
* @param \stdClass $data the form data
* @return string the unique data to save
*/
public function save_unique_data($data) {
return '';
}
/**
* This handles copying data from another element of the same type.
* Can be overridden if more functionality is needed.
*
* @param \stdClass $data the form data
* @return bool returns true if the data was copied successfully, false otherwise
*/
public function copy_element($data) {
return true;
}
/**
* This defines if an element plugin can be added to a certificate.
* Can be overridden if an element plugin wants to take over the control.
*
* @return bool returns true if the element can be added, false otherwise
*/
public static function can_add() {
return true;
}
/**
* Handles rendering the element on the pdf.
*
* Must be overridden.
*
* @param \pdf $pdf the pdf object
* @param bool $preview true if it is a preview, false otherwise
* @param \stdClass $user the user we are rendering this for
*/
abstract public function render($pdf, $preview, $user);
/**
* Render the element in html.
*
* Must be overridden.
*
* This function is used to render the element when we are using the
* drag and drop interface to position it.
*
* @return string the html
*/
abstract public function render_html();
/**
* Handles deleting any data this element may have introduced.
* Can be overridden if more functionality is needed.
*
* @return bool success return true if deletion success, false otherwise
*/
public function delete() {
global $DB;
return $DB->delete_records('customcert_elements', array('id' => $this->id));
}
/**
* This function is responsible for handling the restoration process of the element.
*
* For example, the function may save data that is related to another course module, this
* data will need to be updated if we are restoring the course as the course module id will
* be different in the new course.
*
* @param \restore_customcert_activity_task $restore
*/
public function after_restore($restore) {
}
/**
* Magic getter for read only access.
*
* @param string $name
*/
public function __get($name) {
debugging('Please call the appropriate get_* function instead of relying on magic getters', DEBUG_DEVELOPER);
if (property_exists($this->element, $name)) {
return $this->element->$name;
}
}
/**
* Set edit form instance for the custom cert element.
*
* @param \mod_customcert\edit_element_form $editelementform
*/
public function set_edit_element_form(edit_element_form $editelementform) {
$this->editelementform = $editelementform;
}
/**
* Get edit form instance for the custom cert element.
*
* @return \mod_customcert\edit_element_form
*/
public function get_edit_element_form() {
if (empty($this->editelementform)) {
throw new \coding_exception('Edit element form instance is not set.');
}
return $this->editelementform;
}
}