C:/xampp/htdocs/moodle/mod/feedback/item/feedback_item_class.php

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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/>.

abstract class feedback_item_base {
    protected $type;

    public function __construct() {
        $this->init();
    }

    //this function only can used after the call of build_editform()
    public function show_editform() {
        $this->item_form->display();
    }

    public function is_cancelled() {
        return $this->item_form->is_cancelled();
    }

    public function get_data() {
        if ($this->item = $this->item_form->get_data()) {
            return true;
        }
        return false;
    }

    public function value_type() {
        return PARAM_RAW;
    }

    public function value_is_array() {
        return false;
    }

    abstract public function init();
    abstract public function build_editform($item, $feedback, $cm);
    abstract public function save_item();
    abstract public function check_value($value, $item);
    abstract public function create_value($data);
    abstract public function compare_value($item, $dbvalue, $dependvalue);
    abstract public function get_presentation($data);
    abstract public function get_hasvalue();
    abstract public function can_switch_require();

    abstract public function excelprint_item(&$worksheet, $row_offset,
                                      $xls_formats, $item,
                                      $groupid, $courseid = false);

    abstract public function print_analysed($item, $itemnr = '', $groupid = false, $courseid = false);

    abstract public function get_printval($item, $value);

    abstract public function get_analysed($item, $groupid = false, $courseid = false);

    abstract public function print_item_preview($item);

    abstract public function print_item_complete($item, $value = '', $highlightrequire = false);

    abstract public function print_item_show_value($item, $value = '');

}

//a dummy class to realize pagebreaks
class feedback_item_pagebreak extends feedback_item_base {
    protected $type = "pagebreak";

    public function show_editform() {
    }
    public function is_cancelled() {
    }
    public function get_data() {
    }
    public function init() {
    }
    public function build_editform($item, $feedback, $cm) {
    }
    public function save_item() {
    }
    public function check_value($value, $item) {
    }
    public function create_value($data) {
    }
    public function compare_value($item, $dbvalue, $dependvalue) {
    }
    public function get_presentation($data) {
    }
    public function get_hasvalue() {
    }
    public function excelprint_item(&$worksheet, $row_offset,
                            $xls_formats, $item,
                            $groupid, $courseid = false) {
    }

    public function print_analysed($item, $itemnr = '', $groupid = false, $courseid = false) {
    }
    public function get_printval($item, $value) {
    }
    public function get_analysed($item, $groupid = false, $courseid = false) {
    }
    public function print_item_preview($item) {
    }
    public function print_item_complete($item, $value = '', $highlightrequire = false) {
    }
    public function print_item_show_value($item, $value = '') {
    }
    public function can_switch_require() {
    }

}