Contao\CheckBox::generate PHP Метод

    public function generate()
    {
        $arrOptions = array();
        if (!$this->multiple && count($this->arrOptions) > 1) {
            $this->arrOptions = array($this->arrOptions[0]);
        }
        // The "required" attribute only makes sense for single checkboxes
        if ($this->mandatory && !$this->multiple) {
            $this->arrAttributes['required'] = 'required';
        }
        /** @var AttributeBagInterface $objSessionBag */
        $objSessionBag = \System::getContainer()->get('session')->getBag('contao_backend');
        $state = $objSessionBag->get('checkbox_groups');
        // Toggle the checkbox group
        if (\Input::get('cbc')) {
            $state[\Input::get('cbc')] = isset($state[\Input::get('cbc')]) && $state[\Input::get('cbc')] == 1 ? 0 : 1;
            $objSessionBag->set('checkbox_groups', $state);
            $this->redirect(preg_replace('/(&(amp;)?|\\?)cbc=[^& ]*/i', '', \Environment::get('request')));
        }
        $blnFirst = true;
        $blnCheckAll = true;
        foreach ($this->arrOptions as $i => $arrOption) {
            // Single dimension array
            if (is_numeric($i)) {
                $arrOptions[] = $this->generateCheckbox($arrOption, $i);
                continue;
            }
            $id = 'cbc_' . $this->strId . '_' . \StringUtil::standardize($i);
            $img = 'folPlus.svg';
            $display = 'none';
            if (!isset($state[$id]) || !empty($state[$id])) {
                $img = 'folMinus.svg';
                $display = 'block';
            }
            $arrOptions[] = '<div class="checkbox_toggler' . ($blnFirst ? '_first' : '') . '"><a href="' . \Backend::addToUrl('cbc=' . $id) . '" onclick="AjaxRequest.toggleCheckboxGroup(this,\'' . $id . '\');Backend.getScrollOffset();return false">' . \Image::getHtml($img) . '</a>' . $i . '</div><fieldset id="' . $id . '" class="tl_checkbox_container checkbox_options" style="display:' . $display . '"><input type="checkbox" id="check_all_' . $id . '" class="tl_checkbox" onclick="Backend.toggleCheckboxGroup(this, \'' . $id . '\')"> <label for="check_all_' . $id . '" style="color:#a6a6a6"><em>' . $GLOBALS['TL_LANG']['MSC']['selectAll'] . '</em></label>';
            // Multidimensional array
            foreach ($arrOption as $k => $v) {
                $arrOptions[] = $this->generateCheckbox($v, standardize($i) . '_' . $k);
            }
            $arrOptions[] = '</fieldset>';
            $blnFirst = false;
            $blnCheckAll = false;
        }
        // Add a "no entries found" message if there are no options
        if (empty($arrOptions)) {
            $arrOptions[] = '<p class="tl_noopt">' . $GLOBALS['TL_LANG']['MSC']['noResult'] . '</p>';
            $blnCheckAll = false;
        }
        if ($this->multiple) {
            return sprintf('<fieldset id="ctrl_%s" class="tl_checkbox_container%s"><legend>%s%s%s%s</legend><input type="hidden" name="%s" value="">%s%s</fieldset>%s', $this->strId, $this->strClass != '' ? ' ' . $this->strClass : '', $this->mandatory ? '<span class="invisible">' . $GLOBALS['TL_LANG']['MSC']['mandatory'] . ' </span>' : '', $this->strLabel, $this->mandatory ? '<span class="mandatory">*</span>' : '', $this->xlabel, $this->strName, $blnCheckAll ? '<input type="checkbox" id="check_all_' . $this->strId . '" class="tl_checkbox" onclick="Backend.toggleCheckboxGroup(this,\'ctrl_' . $this->strId . '\')' . ($this->onclick ? ';' . $this->onclick : '') . '"> <label for="check_all_' . $this->strId . '" style="color:#a6a6a6"><em>' . $GLOBALS['TL_LANG']['MSC']['selectAll'] . '</em></label><br>' : '', str_replace('<br></fieldset><br>', '</fieldset>', implode('<br>', $arrOptions)), $this->wizard);
        } else {
            return sprintf('<div id="ctrl_%s" class="tl_checkbox_single_container%s"><input type="hidden" name="%s" value="">%s</div>%s', $this->strId, $this->strClass != '' ? ' ' . $this->strClass : '', $this->strName, str_replace('<br></div><br>', '</div>', implode('<br>', $arrOptions)), $this->wizard);
        }
    }