moodle/message/send_form.php

<?php

require_once($CFG->dirroot.'/lib/formslib.php');

class send_form extends moodleform {

    function definition () {

        $mform =& $this->_form;

        $editoroptions = array('maxfiles'=>0, 'maxbytes'=>0, 'trusttext'=>false);

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

        $systemcontext   = get_context_instance(CONTEXT_SYSTEM);

        $mform->addElement('html', '<div class="message-send-box">');
        $mform->addElement('editor', 'message_editor', get_string('message', 'message'), null, $editoroptions);
        $mform->addElement('html', '</div>');

        $this->add_action_buttons(false, get_string('sendmessage', 'message'));

    }

    /**
     * Used to structure incoming data for the message editor component
     *
     * @param <type> $data
     */
    function set_data($data) {

        $data->message = array('text'=>$data->message, 'format'=>$data->messageformat);

        parent::set_data($data);
    }

    /**
     * Used to reformat the data from the editor component
     *
     * @return stdClass
     */
    function get_data() {
        $data = parent::get_data();

        if ($data !== null) {
            $data->messageformat = $data->message_editor['format'];
            $data->message = clean_text($data->message_editor['text'], $data->messageformat);
        }

        return $data;
    }

    /**
     * Resets the value of the message
     *
     * This is used because after we have acted on the submitted content we want to
     * re-display the form but with an empty message so the user can type the next
     * thing into it
     */
    function reset_message() {
        $this->_form->_elements[$this->_form->_elementIndex['message_editor']]->setValue(array('text'=>''));
    }

}

?>