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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/>.
/**
* Float type form element
*
* Contains HTML class for a float type element
*
* @package core_form
* @category form
* @copyright 2019 Shamim Rezaie <shamim@moodle.com>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
defined('MOODLE_INTERNAL') || die();
global $CFG;
require_once($CFG->libdir . '/form/text.php');
/**
* Float type form element.
*
* This is preferred over the text element when working with float numbers, and takes care of the fact that different languages
* may use different symbols as the decimal separator.
* Using this element, submitted float numbers will be automatically translated from the localised format into the computer format,
* and vice versa when they are being displayed.
*
* @copyright 2019 Shamim Rezaie <shamim@moodle.com>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class MoodleQuickForm_float extends MoodleQuickForm_text {
/**
* MoodleQuickForm_float constructor.
*
* @param string $elementName (optional) name of the float field
* @param string $elementLabel (optional) float field label
* @param string $attributes (optional) Either a typical HTML attribute string or an associative array
*/
public function __construct($elementName = null, $elementLabel = null, $attributes = null) {
parent::__construct($elementName, $elementLabel, $attributes);
$this->_type = 'float';
}
/**
* Called by HTML_QuickForm whenever form event is made on this element.
*
* @param string $event Name of event
* @param mixed $arg event arguments
* @param object $caller calling object
* @return bool
*/
public function onQuickFormEvent($event, $arg, &$caller) {
switch ($event) {
case 'updateValue':
if ($value = $this->_findValue($caller->_constantValues)) {
$value = $this->format_float($value);
}
if (null === $value) {
$value = $this->_findValue($caller->_submitValues);
if (null === $value) {
if ($value = $this->_findValue($caller->_defaultValues)) {
$value = $this->format_float($value);
}
}
}
if (null !== $value) {
parent::setValue($value);
}
return true;
case 'createElement':
$caller->setType($arg[0], PARAM_RAW_TRIMMED);
default:
return parent::onQuickFormEvent($event, $arg, $caller);
}
}
/**
* Checks that the submitted value is a valid float number.
*
* @param string $value The localised float number that is submitted.
* @return string|null Validation error message or null.
*/
public function validateSubmitValue($value) {
if (false === unformat_float($value, true)) {
return get_string('err_numeric', 'core_form');
}
}
/**
* Sets the value of the form element.
*
* @param string $value Default value of the form element
*/
public function setValue($value) {
$value = $this->format_float($value);
parent::setValue($value);
}
/**
* Returns the value of the form element.
*
* @return false|float
*/
public function getValue() {
$value = parent::getValue();
if ($value) {
$value = unformat_float($value, true);
}
return $value;
}
/**
* Returns a 'safe' element's value.
*
* @param array $submitValues array of submitted values to search
* @param bool $assoc whether to return the value as associative array
* @return mixed
*/
public function exportValue(&$submitValues, $assoc = false) {
$value = $this->_findValue($submitValues);
if (null === $value) {
$value = $this->getValue();
} else if ($value) {
$value = unformat_float($value, true);
}
return $this->_prepareValue($value, $assoc);
}
/**
* Used by getFrozenHtml() to pass the element's value if _persistantFreeze is on.
*
* @return string
*/
public function _getPersistantData() {
if (!$this->_persistantFreeze) {
return '';
} else {
$id = $this->getAttribute('id');
if (isset($id)) {
// Id of persistant input is different then the actual input.
$id = array('id' => $id . '_persistant');
} else {
$id = array();
}
return '<input' . $this->_getAttrString(array(
'type' => 'hidden',
'name' => $this->getAttribute('name'),
'value' => $this->getAttribute('value')
) + $id) . ' />';
}
}
/**
* Given a float, prints it nicely.
* This function reserves the number of decimal places.
*
* @param float|null $value The float number to format
* @return string Localised float
*/
private function format_float($value) {
if (is_numeric($value)) {
if ($value > 0) {
$decimals = strlen($value) - strlen(floor($value)) - 1;
} else {
$decimals = strlen($value) - strlen(ceil($value)) - 1;
}
$value = format_float($value, $decimals);
}
return $value;
}
}