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<?php
// This file is part of 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/>.
/**
* Duration form element
*
* Contains class to create length of time for element.
*
* @package core_form
* @copyright 2009 Tim Hunt
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
global $CFG;
require_once($CFG->libdir . '/form/group.php');
require_once($CFG->libdir . '/formslib.php');
require_once($CFG->libdir . '/form/text.php');
/**
* Duration element
*
* HTML class for a length of time. For example, 30 minutes of 4 days. The
* values returned to PHP is the duration in seconds.
*
* @package core_form
* @category form
* @copyright 2009 Tim Hunt
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class MoodleQuickForm_duration extends MoodleQuickForm_group {
/**
* Control the fieldnames for form elements
* optional => if true, show a checkbox beside the element to turn it on (or off)
* @var array
*/
protected $_options = array('optional' => false, 'defaultunit' => MINSECS);
/** @var array associative array of time units (days, hours, minutes, seconds) */
private $_units = null;
/**
* constructor
*
* @param string $elementName Element's name
* @param mixed $elementLabel Label(s) for an element
* @param array $options Options to control the element's display. Recognised values are
* 'optional' => true/false - whether to display an 'enabled' checkbox next to the element.
* 'defaultunit' => 1|MINSECS|HOURSECS|DAYSECS|WEEKSECS - the default unit to display when
* the time is blank. If not specified, minutes is used.
* 'units' => array containing some or all of 1, MINSECS, HOURSECS, DAYSECS and WEEKSECS
* which unit choices to offer.
* @param mixed $attributes Either a typical HTML attribute string or an associative array
*/
public function __construct($elementName = null, $elementLabel = null,
$options = array(), $attributes = null) {
// TODO MDL-52313 Replace with the call to parent::__construct().
HTML_QuickForm_element::__construct($elementName, $elementLabel, $attributes);
$this->_persistantFreeze = true;
$this->_appendName = true;
$this->_type = 'duration';
// Set the options, do not bother setting bogus ones
if (!is_array($options)) {
$options = array();
}
$this->_options['optional'] = !empty($options['optional']);
if (isset($options['defaultunit'])) {
if (!array_key_exists($options['defaultunit'], $this->get_units())) {
throw new coding_exception($options['defaultunit'] .
' is not a recognised unit in MoodleQuickForm_duration.');
}
$this->_options['defaultunit'] = $options['defaultunit'];
}
if (isset($options['units'])) {
if (!is_array($options['units'])) {
throw new coding_exception(
'When creating a duration form field, units option must be an array.');
}
// Validate and register requested units.
$availableunits = $this->get_units();
$displayunits = [];
foreach ($options['units'] as $requestedunit) {
if (!isset($availableunits[$requestedunit])) {
throw new coding_exception($requestedunit .
' is not a recognised unit in MoodleQuickForm_duration.');
}
$displayunits[$requestedunit] = $availableunits[$requestedunit];
}
krsort($displayunits, SORT_NUMERIC);
$this->_options['units'] = $displayunits;
}
}
/**
* Old syntax of class constructor. Deprecated in PHP7.
*
* @deprecated since Moodle 3.1
*/
public function MoodleQuickForm_duration($elementName = null, $elementLabel = null,
$options = array(), $attributes = null) {
debugging('Use of class name as constructor is deprecated', DEBUG_DEVELOPER);
self::__construct($elementName, $elementLabel, $options, $attributes);
}
/**
* Returns time associative array of unit length.
*
* @return array unit length in seconds => string unit name.
*/
public function get_units() {
if (is_null($this->_units)) {
$this->_units = array(
WEEKSECS => get_string('weeks'),
DAYSECS => get_string('days'),
HOURSECS => get_string('hours'),
MINSECS => get_string('minutes'),
1 => get_string('seconds'),
);
}
return $this->_units;
}
/**
* Get the units to be used for this field.
*
* The ones specified in the options passed to the constructor, or all by default.
*
* @return array number of seconds => lang string.
*/
protected function get_units_used() {
if (!empty($this->_options['units'])) {
return $this->_options['units'];
} else {
return $this->get_units();
}
}
/**
* Converts seconds to the best possible time unit. for example
* 1800 -> [30, MINSECS] = 30 minutes.
*
* @param int $seconds an amout of time in seconds.
* @return array associative array ($number => $unit)
*/
public function seconds_to_unit($seconds) {
if ($seconds == 0) {
return array(0, $this->_options['defaultunit']);
}
foreach ($this->get_units_used() as $unit => $notused) {
if (fmod($seconds, $unit) == 0) {
return array($seconds / $unit, $unit);
}
}
return array($seconds, 1);
}
/**
* Override of standard quickforms method to create this element.
*/
function _createElements() {
$attributes = $this->getAttributes();
if (is_null($attributes)) {
$attributes = array();
}
if (!isset($attributes['size'])) {
$attributes['size'] = 3;
}
$this->_elements = array();
// E_STRICT creating elements without forms is nasty because it internally uses $this
$number = $this->createFormElement('text', 'number',
get_string('time', 'form'), $attributes, true);
$number->set_force_ltr(true);
$this->_elements[] = $number;
unset($attributes['size']);
$this->_elements[] = $this->createFormElement('select', 'timeunit',
get_string('timeunit', 'form'), $this->get_units_used(), $attributes, true);
// If optional we add a checkbox which the user can use to turn if on
if($this->_options['optional']) {
$this->_elements[] = $this->createFormElement('checkbox', 'enabled', null,
get_string('enable'), $this->getAttributes(), true);
}
foreach ($this->_elements as $element){
if (method_exists($element, 'setHiddenLabel')){
$element->setHiddenLabel(true);
}
}
}
/**
* Called by HTML_QuickForm whenever form event is made on this element
*
* @param string $event Name of event
* @param mixed $arg event arguments
* @param MoodleQuickForm $caller calling object
* @return bool
*/
function onQuickFormEvent($event, $arg, &$caller) {
$this->setMoodleForm($caller);
switch ($event) {
case 'updateValue':
// constant values override both default and submitted ones
// default values are overriden by submitted
$value = $this->_findValue($caller->_constantValues);
if (null === $value) {
// if no boxes were checked, then there is no value in the array
// yet we don't want to display default value in this case
if ($caller->isSubmitted() && !$caller->is_new_repeat($this->getName())) {
$value = $this->_findValue($caller->_submitValues);
} else {
$value = $this->_findValue($caller->_defaultValues);
}
}
if (!is_array($value)) {
list($number, $unit) = $this->seconds_to_unit($value);
$value = array('number' => $number, 'timeunit' => $unit);
// If optional, default to off, unless a date was provided
if ($this->_options['optional']) {
$value['enabled'] = $number != 0;
}
} else {
$value['enabled'] = isset($value['enabled']);
}
if (null !== $value){
$this->setValue($value);
}
break;
case 'createElement':
if (!empty($arg[2]['optional'])) {
$caller->disabledIf($arg[0], $arg[0] . '[enabled]');
}
$caller->setType($arg[0] . '[number]', PARAM_FLOAT);
return parent::onQuickFormEvent($event, $arg, $caller);
break;
default:
return parent::onQuickFormEvent($event, $arg, $caller);
}
}
/**
* Returns HTML for advchecbox form element.
*
* @return string
*/
function toHtml() {
include_once('HTML/QuickForm/Renderer/Default.php');
$renderer = new HTML_QuickForm_Renderer_Default();
$renderer->setElementTemplate('{element}');
parent::accept($renderer);
return $renderer->toHtml();
}
/**
* Accepts a renderer
*
* @param HTML_QuickForm_Renderer $renderer An HTML_QuickForm_Renderer object
* @param bool $required Whether a group is required
* @param string $error An error message associated with a group
*/
function accept(&$renderer, $required = false, $error = null) {
$renderer->renderElement($this, $required, $error);
}
/**
* Output a timestamp. Give it the name of the group.
* Override of standard quickforms method.
*
* @param array $submitValues
* @param bool $assoc whether to return the value as associative array
* @return array field name => value. The value is the time interval in seconds.
*/
function exportValue(&$submitValues, $assoc = false) {
// Get the values from all the child elements.
$valuearray = array();
foreach ($this->_elements as $element) {
$thisexport = $element->exportValue($submitValues[$this->getName()], true);
if (!is_null($thisexport)) {
$valuearray += $thisexport;
}
}
// Convert the value to an integer number of seconds.
if (empty($valuearray)) {
return null;
}
if ($this->_options['optional'] && empty($valuearray['enabled'])) {
return $this->_prepareValue(0, $assoc);
}
return $this->_prepareValue($valuearray['number'] * $valuearray['timeunit'], $assoc);
}
}