Proyectos de Subversion Moodle

<?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/>.

defined('MOODLE_INTERNAL') || die();

use core\output\choicelist;

use core\output\local\dropdown\status;

require_once('HTML/QuickForm/select.php');

require_once('templatable_form_element.php');

/**

 * User choice using a dropdown type form element.

 *

 * @package   core_form

 * @category  form

 * @copyright 2023 Ferran Recio <ferran@moodle.com>

 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later

 */

class MoodleQuickForm_choicedropdown extends HTML_QuickForm_select implements templatable {

    use templatable_form_element {

        export_for_template as export_for_template_base;

    }

    /**

     * @var string html for help button, if empty then no help.

     */

    protected string $_helpbutton = '';

    /**

     * @var bool if true label will be hidden.

     */

    protected bool $_hiddenLabel = false;

    /**

     * @var choicelist the user choices.

     */

    protected ?choicelist $choice = null;

    /**

     * @var string[] Dropdown dialog width.

     */

    public const WIDTH = status::WIDTH;

    /**

     * @var string the dropdown width (from core\output\local\dropdown\status::WIDTH).

     */

    protected string $dropdownwidth = status::WIDTH['small'];

    /**

     * Constructor.

     *

     * @param string $elementname Select name attribute

     * @param mixed $elementlabel Label(s) for the select

     * @param choicelist $options Data to be used to populate options

     * @param mixed $attributes Either a typical HTML attribute string or an associative array

     */

    public function __construct(

        $elementname = null,

        $elementlabel = null,

        choicelist $options = null,

        $attributes = null

    ) {

        parent::__construct($elementname, $elementlabel, $options, $attributes);

        $this->_type = 'choicedropdown';

    }

    /**

     * Set the dropdown width.

     *

     * @param string $width

     */

    public function set_dialog_width(string $width) {

        $this->dropdownwidth = $width;

    }

    /**

     * Loads options from a choicelist.

     *

     * @param choicelist $choice Options source currently supports assoc array or DB_result

     * @param string|null $value optional value (in case it is not defined in the choicelist)

     * @param string|null $unused2 unused

     * @param string|null $unused3 unused

     * @param string|null $unused4 unused

     * @return bool

     */

    public function load(&$choice, $value = null, $unused2 = null, $unused3 = null, $unused4 = null): bool {

        if (!$choice instanceof choicelist) {

            throw new coding_exception('Choice must be instance of choicelist');

        }

        $this->choice = $choice;

        $this->choice->set_allow_empty(false);

        if ($value !== null && is_string($value)) {

            $choice->set_selected_value($value);

        }

        $this->setSelected($choice->get_selected_value());

        return true;

    }

    /**

     * Sets label to be hidden

     *

     * @param bool $hiddenLabel sets if label should be hidden

     */

    public function setHiddenLabel($hiddenLabel) {

        $this->_hiddenLabel = $hiddenLabel;

    }

    /**

     * Returns HTML for select form element.

     *

     * This method is only needed when forms renderer is forces via

     * $GLOBALS['_HTML_QuickForm_default_renderer']. Otherwise the

     * renderer will use mustache templates.

     *

     * @return string

     */

    public function toHtml(): string {

        $html = '';

        if ($this->_hiddenLabel) {

            $this->_generateId();

            $html .= '<label class="accesshide" for="'.$this->getAttribute('id').'" >'.$this->getLabel().'</label>';

        }

        $html .= parent::toHtml();

        return $html;

    }

    /**

     * get html for help button

     *

     * @return string html for help button

     */

    public function getHelpButton(): string {

        return $this->_helpbutton;

    }

    /**

     * Slightly different container template when frozen. Don't want to use a label tag

     * with a for attribute in that case for the element label but instead use a div.

     * Templates are defined in renderer constructor.

     *

     * @return string

     */

    public function getElementTemplateType(): string {

        if ($this->_flagFrozen) {

            return 'static';

        } else {

            return 'default';

        }

    }

    /**

     * We check the options and return only the values that _could_ have been

     * selected. We also return a scalar value if select is not "multiple"

     *

     * @param string $submitvalues submitted values

     * @param bool $assoc if true the returned value is associated array

     * @return string|null

     */

    public function exportValue(&$submitvalues, $assoc = false) {

        $value = $this->_findValue($submitvalues) ?? $this->getValue();

        if (is_array($value)) {

            $value = reset($value);

        }

        if ($value === null) {

            return $this->_prepareValue($value, $assoc);

        }

        if (!$this->choice->has_value($value)) {

            $value = $this->choice->get_selected_value();

        }

        return $this->_prepareValue($value, $assoc);

    }

    public function export_for_template(renderer_base $output): array {

        $context = $this->export_for_template_base($output);

        if (!empty($this->_values)) {

            $this->choice->set_selected_value(reset($this->_values));

        }

        $dialog = new status(

            $this->choice->get_selected_content($output),

            $this->choice,

            [

                'extras' => ['data-form-controls' => $context['id']],

                'buttonsync' => true,

                'updatestatus' => true,

                'dialogwidth' => $this->dropdownwidth,

            ]

        );

        $context['dropdown'] = $dialog->export_for_template($output);

        $context['select'] = $this->choice->export_for_template($output);

        $context['nameraw'] = $this->getName();

        return $context;

    }

}