editimage_form.php

<?php

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

require_once("{$CFG->libdir}/formslib.php");

class image_form extends moodleform {
    function definition() {
        $mform = $this->_form;
        $instance = $this->_customdata;

        // visible elements
        $mform->addElement('filepicker', 'assignment_file',
            get_string('uploadafile'), null, $instance['options']);

        // hidden params
        $mform->addElement('hidden', 'contextid', $instance['contextid']);
        $mform->setType('contextid', PARAM_INT);
        $mform->addElement('hidden', 'userid', $instance['userid']);
        $mform->setType('userid', PARAM_INT);
        $mform->addElement('hidden', 'sectionid', $instance['sectionid']);
        $mform->setType('sectionid', PARAM_INT);
        $mform->addElement('hidden', 'action', 'uploadfile');
        $mform->setType('action', PARAM_ALPHA);

        // buttons
        $this->add_action_buttons(true, get_string('savechanges', 'admin'));
    }
}