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/>.

/**

 * Contains class mod_feedback_complete_form

 *

 * @package   mod_feedback

 * @copyright 2016 Marina Glancy

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

 */

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

/**

 * Class mod_feedback_complete_form

 *

 * @package   mod_feedback

 * @copyright 2016 Marina Glancy

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

 */

class mod_feedback_complete_form extends moodleform {

    /** @var int */

    const MODE_COMPLETE = 1;

    /** @var int */

    const MODE_PRINT = 2;

    /** @var int */

    const MODE_EDIT = 3;

    /** @var int */

    const MODE_VIEW_RESPONSE = 4;

    /** @var int */

    const MODE_VIEW_TEMPLATE = 5;

    /** @var int */

    protected $mode;

    /** @var mod_feedback_structure|mod_feedback_completion */

    protected $structure;

    /** @var mod_feedback_completion */

    protected $completion;

    /** @var int */

    protected $gopage;

    /** @var bool */

    protected $hasrequired = false;

    /**

     * Constructor

     *

     * @param int $mode

     * @param mod_feedback_structure $structure

     * @param string $formid CSS id attribute of the form

     * @param array $customdata

     */

    public function __construct($mode, mod_feedback_structure $structure, $formid, $customdata = null) {

        $this->mode = $mode;

        $this->structure = $structure;

        $this->gopage = isset($customdata['gopage']) ? $customdata['gopage'] : 0;

        $isanonymous = $this->structure->is_anonymous() ? ' ianonymous' : '';

        parent::__construct(null, $customdata, 'POST', '',

                array('id' => $formid, 'class' => 'feedback_form' . $isanonymous), true);

        $this->set_display_vertical();

    }

    /**

     * Form definition

     */

    public function definition() {

        $mform = $this->_form;

        $mform->addElement('hidden', 'id', $this->get_cm()->id);

        $mform->setType('id', PARAM_INT);

        $mform->addElement('hidden', 'courseid', $this->get_current_course_id());

        $mform->setType('courseid', PARAM_INT);

        $mform->addElement('hidden', 'gopage');

        $mform->setType('gopage', PARAM_INT);

        $mform->addElement('hidden', 'lastpage');

        $mform->setType('lastpage', PARAM_INT);

        $mform->addElement('hidden', 'startitempos');

        $mform->setType('startitempos', PARAM_INT);

        $mform->addElement('hidden', 'lastitempos');

        $mform->setType('lastitempos', PARAM_INT);

        if (isloggedin() && !isguestuser() && $this->mode != self::MODE_EDIT && $this->mode != self::MODE_VIEW_TEMPLATE &&

                    $this->mode != self::MODE_VIEW_RESPONSE) {

            // Output information about the current mode (anonymous or not) in some modes.

            if ($this->structure->is_anonymous()) {

                $anonymousmodeinfo = get_string('anonymous', 'feedback');

            } else {

                $anonymousmodeinfo = get_string('non_anonymous', 'feedback');

            }

            $element = $mform->addElement('static', 'anonymousmode', '',

                    get_string('mode', 'feedback') . ': ' . $anonymousmodeinfo);

            $element->setAttributes($element->getAttributes() + ['class' => 'feedback_mode']);

        }

        // Add buttons to go to previous/next pages and submit the feedback.

        if ($this->mode == self::MODE_COMPLETE) {

            $buttonarray = array();

            $buttonarray[] = &$mform->createElement('submit', 'gopreviouspage', get_string('previous_page', 'feedback'));

            $buttonarray[] = &$mform->createElement('submit', 'gonextpage', get_string('next_page', 'feedback'),

                    array('class' => 'form-submit'));

            $buttonarray[] = &$mform->createElement('submit', 'savevalues', get_string('save_entries', 'feedback'),

                    array('class' => 'form-submit'));

            $buttonarray[] = &$mform->createElement('cancel');

            $mform->addGroup($buttonarray, 'buttonar', '', array(' '), false);

            $mform->closeHeaderBefore('buttonar');

        }

        if ($this->mode == self::MODE_COMPLETE) {

            $this->definition_complete();

        } else {

            $this->definition_preview();

        }

        // Set data.

        $this->set_data(array('gopage' => $this->gopage));

    }

    /**

     * Called from definition_after_data() in the completion mode

     *

     * This will add only items from a current page to the feedback and adjust the buttons

     */

    protected function definition_complete() {

        if (!$this->structure instanceof mod_feedback_completion) {

            // We should not really be here but just in case.

            return;

        }

        $pages = $this->structure->get_pages();

        $gopage = $this->gopage;

        $pageitems = $pages[$gopage];

        $hasnextpage = $gopage < count($pages) - 1; // Until we complete this page we can not trust get_next_page().

        $hasprevpage = $gopage && ($this->structure->get_previous_page($gopage, false) !== null);

        // Add elements.

        foreach ($pageitems as $item) {

            $itemobj = feedback_get_item_class($item->typ);

            $itemobj->complete_form_element($item, $this);

        }

        // Remove invalid buttons (for example, no "previous page" if we are on the first page).

        if (!$hasprevpage) {

            $this->remove_button('gopreviouspage');

        }

        if (!$hasnextpage) {

            $this->remove_button('gonextpage');

        }

        if ($hasnextpage) {

            $this->remove_button('savevalues');

        }

    }

    /**

     * Called from definition_after_data() in all modes except for completion

     *

     * This will add all items to the form, including pagebreaks as horizontal rules.

     */

    protected function definition_preview() {

        foreach ($this->structure->get_items() as $feedbackitem) {

            $itemobj = feedback_get_item_class($feedbackitem->typ);

            $itemobj->complete_form_element($feedbackitem, $this);

        }

    }

    /**

     * Removes the button that is not applicable for the current page

     *

     * @param string $buttonname

     */

    private function remove_button($buttonname) {

        $el = $this->_form->getElement('buttonar');

        foreach ($el->_elements as $idx => $button) {

            if ($button instanceof MoodleQuickForm_submit && $button->getName() === $buttonname) {

                unset($el->_elements[$idx]);

                return;

            }

        }

    }

    /**

     * Returns value for this element that is already stored in temporary or permanent table,

     * usually only available when user clicked "Previous page". Null means no value is stored.

     *

     * @param stdClass $item

     * @return string

     */

    public function get_item_value($item) {

        if ($this->structure instanceof mod_feedback_completion) {

            return $this->structure->get_item_value($item);

        }

        return null;

    }

    /**

     * Can be used by the items to get the course id for which feedback is taken

     *

     * This function returns 0 for feedbacks that are located inside the courses.

     * $this->get_feedback()->course will return the course where feedback is located.

     * $this->get_current_course_id() will return the course where user was before taking the feedback

     *

     * @return int

     */

    public function get_course_id() {

        return $this->structure->get_courseid();

    }

    /**

     * Record from 'feedback' table corresponding to the current feedback

     * @return stdClass

     */

    public function get_feedback() {

        return $this->structure->get_feedback();

    }

    /**

     * Current feedback mode, see constants on the top of this class

     * @return int

     */

    public function get_mode() {

        return $this->mode;

    }

    /**

     * Returns whether the form is frozen, some items may prefer to change the element

     * type in case of frozen form. For example, text or textarea element does not look

     * nice when frozen

     *

     * @return bool

     */

    public function is_frozen() {

        return $this->mode == self::MODE_VIEW_RESPONSE;

    }

    /**

     * Returns the current course module

     * @return cm_info

     */

    public function get_cm() {

        return $this->structure->get_cm();

    }

    /**

     * Returns the course where user was before taking the feedback.

     *

     * For feedbacks inside the course it will be the same as $this->get_feedback()->course.

     * For feedbacks on the frontpage it will be the same as $this->get_course_id()

     *

     * @return int

     */

    public function get_current_course_id() {

        return $this->structure->get_courseid() ?: $this->get_feedback()->course;

    }

    /**

     * CSS class for the item

     * @param stdClass $item

     * @return string

     */

    protected function get_suggested_class($item) {

        $class = "feedback_itemlist feedback-item-{$item->typ}";

        if ($item->dependitem) {

            $class .= " feedback_is_dependent";

        }

        if ($item->typ !== 'pagebreak') {

            $itemobj = feedback_get_item_class($item->typ);

            if ($itemobj->get_hasvalue()) {

                $class .= " feedback_hasvalue";

            }

        }

        return $class;

    }

    /**

     * Adds an element to this form - to be used by items in their complete_form_element() method

     *

     * @param stdClass $item

     * @param HTML_QuickForm_element|array $element either completed form element or an array that

     *      can be passed as arguments to $this->_form->createElement() function

     * @param bool $addrequiredrule automatically add 'required' rule

     * @param bool $setdefaultvalue automatically set default value for element

     * @return HTML_QuickForm_element

     */

    public function add_form_element($item, $element, $addrequiredrule = true, $setdefaultvalue = true) {

        global $OUTPUT;

        if (is_array($element) && $element[0] == 'group') {

            // For groups, use the mforms addGroup API.

            // $element looks like: ['group', $groupinputname, $name, $objects, $separator, $appendname],

            $element = $this->_form->addGroup($element[3], $element[1], $element[2], $element[4], $element[5]);

        } else {

            // Add non-group element to the form.

            if (is_array($element)) {

                $element = call_user_func_array(array($this->_form, 'createElement'), $element);

            }

            $element = $this->_form->addElement($element);

        }

        // Prepend standard CSS classes to the element classes.

        $attributes = $element->getAttributes();

        $class = !empty($attributes['class']) ? ' ' . $attributes['class'] : '';

        $attributes['class'] = $this->get_suggested_class($item) . $class;

        $element->setAttributes($attributes);

        // Add required rule.

        if ($item->required && $addrequiredrule) {

            $this->_form->addRule($element->getName(), get_string('required'), 'required', null, 'client');

        }

        // Set default value.

        if ($setdefaultvalue && ($tmpvalue = $this->get_item_value($item))) {

            $this->_form->setDefault($element->getName(), htmlspecialchars_decode($tmpvalue, ENT_QUOTES));

        }

        // Freeze if needed.

        if ($this->is_frozen()) {

            $element->freeze();

        }

        // Add red asterisks on required fields.

        if ($item->required) {

            $required = $OUTPUT->pix_icon('req', get_string('requiredelement', 'form'));

            $element->setLabel($element->getLabel() . $required);

            $this->hasrequired = true;

        }

        // Add different useful stuff to the question name.

        $this->add_item_label($item, $element);

        $this->add_item_dependencies($item, $element);

        $this->add_item_number($item, $element);

        if ($this->mode == self::MODE_EDIT) {

            $this->enhance_name_for_edit($item, $element);

        }

        return $element;

    }

    /**

     * Adds a group element to this form - to be used by items in their complete_form_element() method

     *

     * @param stdClass $item

     * @param string $groupinputname name for the form element

     * @param string $name question text

     * @param array $elements array of arrays that can be passed to $this->_form->createElement()

     * @param string $separator separator between group elements

     * @param string $class additional CSS classes for the form element

     * @return HTML_QuickForm_element

     */

    public function add_form_group_element($item, $groupinputname, $name, $elements, $separator,

            $class = '') {

        $objects = array();

        foreach ($elements as $element) {

            $object = call_user_func_array(array($this->_form, 'createElement'), $element);

            $objects[] = $object;

        }

        $element = $this->add_form_element($item,

                ['group', $groupinputname, $name, $objects, $separator, false],

                false,

                false);

        if ($class !== '') {

            $attributes = $element->getAttributes();

            $attributes['class'] .= ' ' . $class;

            $element->setAttributes($attributes);

        }

        return $element;

    }

    /**

     * Adds an item number to the question name (if feedback autonumbering is on)

     * @param stdClass $item

     * @param HTML_QuickForm_element $element

     */

    protected function add_item_number($item, $element) {

        if ($this->get_feedback()->autonumbering && !empty($item->itemnr)) {

            $name = $element->getLabel();

            $element->setLabel(html_writer::span($item->itemnr. '.', 'itemnr') . ' ' . $name);

        }

    }

    /**

     * Adds an item label to the question name

     * @param stdClass $item

     * @param HTML_QuickForm_element $element

     */

    protected function add_item_label($item, $element) {

        if (strlen($item->label) && ($this->mode == self::MODE_EDIT || $this->mode == self::MODE_VIEW_TEMPLATE)) {

            $name = get_string('nameandlabelformat', 'mod_feedback',

                (object)['label' => format_string($item->label), 'name' => $element->getLabel()]);

            $element->setLabel($name);

        }

    }

    /**

     * Adds a dependency description to the question name

     * @param stdClass $item

     * @param HTML_QuickForm_element $element

     */

    protected function add_item_dependencies($item, $element) {

        $allitems = $this->structure->get_items();

        if ($item->dependitem && ($this->mode == self::MODE_EDIT || $this->mode == self::MODE_VIEW_TEMPLATE)) {

            if (isset($allitems[$item->dependitem])) {

                $dependitem = $allitems[$item->dependitem];

                $name = $element->getLabel();

                $name .= html_writer::span(' ('.format_string($dependitem->label).'->'.$item->dependvalue.')',

                        'feedback_depend');

                $element->setLabel($name);

            }

        }

    }

    /**

     * Returns the CSS id attribute that will be assigned by moodleform later to this element

     * @param stdClass $item

     * @param HTML_QuickForm_element $element

     */

    protected function guess_element_id($item, $element) {

        if (!$id = $element->getAttribute('id')) {

            $attributes = $element->getAttributes();

            $id = $attributes['id'] = 'feedback_item_' . $item->id;

            $element->setAttributes($attributes);

        }

        if ($element->getType() === 'group') {

            return 'fgroup_' . $id;

        }

        return 'fitem_' . $id;

    }

    /**

     * Adds editing actions to the question name in the edit mode

     * @param stdClass $item

     * @param HTML_QuickForm_element $element

     */

    protected function enhance_name_for_edit($item, $element) {

        global $OUTPUT;

        $menu = new action_menu();

        $menu->set_owner_selector('#' . $this->guess_element_id($item, $element));

        $menu->set_menu_trigger(get_string('edit'));

        $menu->prioritise = true;

        $itemobj = feedback_get_item_class($item->typ);

        $actions = $itemobj->edit_actions($item, $this->get_feedback(), $this->get_cm());

        foreach ($actions as $action) {

            $menu->add($action);

        }

        $editmenu = $OUTPUT->render($menu);

        $name = $element->getLabel();

        $name = html_writer::span('', 'itemdd', array('id' => 'feedback_item_box_' . $item->id)) .

                html_writer::span($name, 'itemname') .

                html_writer::span($editmenu, 'itemactions');

        $element->setLabel(html_writer::span($name, 'itemtitle'));

    }

    /**

     * Sets the default value for form element - alias to $this->_form->setDefault()

     * @param HTML_QuickForm_element|string $element

     * @param mixed $defaultvalue

     */

    public function set_element_default($element, $defaultvalue) {

        if ($element instanceof HTML_QuickForm_element) {

            $element = $element->getName();

        }

        $this->_form->setDefault($element, $defaultvalue);

    }

    /**

     * Sets the default value for form element - wrapper to $this->_form->setType()

     * @param HTML_QuickForm_element|string $element

     * @param int $type

     */

    public function set_element_type($element, $type) {

        if ($element instanceof HTML_QuickForm_element) {

            $element = $element->getName();

        }

        $this->_form->setType($element, $type);

    }

    /**

     * Adds a validation rule for the given field - wrapper for $this->_form->addRule()

     *

     * Do not use for 'required' rule!

     * Required * will be added automatically, if additional validation is needed

     * use method {@link self::add_validation_rule()}

     *

     * @param string $element Form element name

     * @param string $message Message to display for invalid data

     * @param string $type Rule type, use getRegisteredRules() to get types

     * @param string $format (optional)Required for extra rule data

     * @param string $validation (optional)Where to perform validation: "server", "client"

     * @param bool $reset Client-side validation: reset the form element to its original value if there is an error?

     * @param bool $force Force the rule to be applied, even if the target form element does not exist

     */

    public function add_element_rule($element, $message, $type, $format = null, $validation = 'server',

            $reset = false, $force = false) {

        if ($element instanceof HTML_QuickForm_element) {

            $element = $element->getName();

        }

        $this->_form->addRule($element, $message, $type, $format, $validation, $reset, $force);

    }

    /**

     * Adds a validation rule to the form

     *

     * @param callable $callback with arguments ($values, $files)

     */

    public function add_validation_rule(callable $callback) {

        if ($this->mode == self::MODE_COMPLETE) {

            $this->_form->addFormRule($callback);

        }

    }

    /**

     * Returns a reference to the element - wrapper for function $this->_form->getElement()

     *

     * @param string $elementname Element name

     * @return HTML_QuickForm_element reference to element

     */

    public function get_form_element($elementname) {

        return $this->_form->getElement($elementname);

    }

    /**

     * Displays the form

     */

    public function display() {

        global $OUTPUT, $PAGE;

        // Finalize the form definition if not yet done.

        if (!$this->_definition_finalized) {

            $this->_definition_finalized = true;

            $this->definition_after_data();

        }

        $mform = $this->_form;

        // Add "This form has required fields" text in the bottom of the form.

        if (($mform->_required || $this->hasrequired) &&

               ($this->mode == self::MODE_COMPLETE || $this->mode == self::MODE_PRINT || $this->mode == self::MODE_VIEW_TEMPLATE)) {

            $element = $mform->addElement('static', 'requiredfields', '',

                    get_string('somefieldsrequired', 'form',

                            $OUTPUT->pix_icon('req', get_string('requiredelement', 'form'))));

            $element->setAttributes($element->getAttributes() + ['class' => 'requirednote']);

        }

        // Reset _required array so the default red * are not displayed.

        $mform->_required = array();

        // Move buttons to the end of the form.

        if ($this->mode == self::MODE_COMPLETE) {

            $mform->addElement('hidden', '__dummyelement');

            $buttons = $mform->removeElement('buttonar', false);

            $mform->insertElementBefore($buttons, '__dummyelement');

            $mform->removeElement('__dummyelement');

        }

        $this->_form->display();

        if ($this->mode == self::MODE_EDIT) {

            $PAGE->requires->js_call_amd('mod_feedback/edit', 'setup');

        }

    }

}