moodle/mod/forum/post_form.php

<?php
require_once ($CFG->libdir.'/formslib.php');
class forum_post_form extends moodleform {

	function definition() {

		global $CFG;
		$mform    =& $this->_form;
		$renderer =& $mform->defaultRenderer();

		extract($this->_customdata);


        $mform->addElement('header', 'general', '');//fill in the data depending on page params
                                                //later using set_defaults
		$mform->addElement('text', 'subject', get_string("subject", "forum"), 'size="60"');
		$mform->setType('subject', PARAM_TEXT);
		$mform->addRule('subject', get_string('required'), 'required', null, 'client');

		$mform->addElement('htmleditor', 'message', get_string("message", "forum"));
		$mform->setType('message', PARAM_RAW);
		$mform->addRule('message', get_string('required'), 'required', null, 'client');

        $mform->addElement('format', 'format', get_string('format'));
        $mform->setHelpButton('format', array("textformat", get_string("helpformatting")));


		if (isset($forum->id)&& forum_is_forcesubscribed($forum->id)) {

			$mform->addElement('static', 'subscribemessage', get_string("subscription", "forum"), get_string("everyoneissubscribed", "forum"));
            $mform->addElement('hidden', 'subscribe');
            $mform->setHelpButton('subscribemessage', array("subscription", get_string("subscription", "forum"), "forum"));

		} else if (isset($forum->forcesubscribe)&& $forum->forcesubscribe != FORUM_DISALLOWSUBSCRIBE ||
		              has_capability('moodle/course:manageactivities', $coursecontext)){
			unset($options);
			$options[0] = get_string("subscribestop", "forum");
			$options[1] = get_string("subscribestart", "forum");

			$mform->addElement('select', 'subscribe', get_string("subscription", "forum"), $options);
            $mform->setHelpButton('subscribe', array("subscription", get_string("subscription", "forum"), "forum"));
		} else if ($forum->forcesubscribe == FORUM_DISALLOWSUBSCRIBE) {
			$mform->addElement('static', 'subscribemessage', get_string("subscription", "forum"), get_string('disallowsubscribe', 'forum'));
            $mform->addElement('hidden', 'subscribe');
            $mform->setHelpButton('subscribemessage', array("subscription", get_string("subscription", "forum"), "forum"));
		}

		if (empty($post->id)
		      && has_capability('moodle/course:manageactivities', $coursecontext)) {
            $mform->addElement('checkbox', 'mailnow', get_string("mailnow", "forum"));
		}

		if (!isset($discussion->timestart)) {
			$discussion->timestart = 0;
		}
		if (!isset($discussion->timeend)) {
			$discussion->timeend = 0;
		}
		if (!empty($CFG->forum_enabletimedposts) && !$post->parent) {
            $mform->addElement('header','', get_string("displayperiod", "forum"));
		    $timestartgroup=array();
		    $timestartgroup[]=&MoodleQuickForm::createElement('date_selector', 'timestart', get_string('timestartday', 'forum'));
		    $timestartgroup[]=&MoodleQuickForm::createElement('checkbox', 'timestartdisabled', '', get_string('disable'));
            $mform->addGroup($timestartgroup, 'timestartgroup', get_string('displaystart', 'forum'), '&nbsp;', false);
			$mform->setHelpButton('timestartgroup', array("displayperiod", get_string("displayperiod", "forum"), "forum"));
			$timeendgroup=array();
		    $timeendgroup[]=&MoodleQuickForm::createElement('date_selector', 'timeend', get_string('timeendday', 'forum'));
			$timeendgroup[]=&MoodleQuickForm::createElement('checkbox', 'timeenddisabled', '', get_string('disable'));
            $mform->addGroup($timeendgroup, 'timeendgroup', get_string('displayend', 'forum'), '&nbsp;', false);
			$mform->setHelpButton('timeendgroup', array("displayperiod", get_string("displayperiod", "forum"), "forum"));
		} else {
			$mform->addElement('hidden', 'timestartdisabled', '1');
			$mform->setType('timestartdisabled', PARAM_INT);
			$mform->addElement('hidden', 'timeenddisabled', '1');
			$mform->setType('timeenddisabled', PARAM_INT);

		}
		if(isset($post->edit)){
			$submit_string=get_string('savechanges');
		}else{
			$submit_string=get_string('posttoforum', 'forum');
		}
		$mform->addElement('submit', 'submit', $submit_string);
		$renderer->addStopFieldsetElements('submit');

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

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

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

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

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

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

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

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

	}

	function validation($data){
	    $error=array();
        if (empty($data['timeenddisabled']) && empty($data['timestartdisabled'])
                     && $data['timeend'] <= $data['timestart']) {
             $error['timeendgroup'] = get_string('timestartenderror', 'forum');
        }
        return (count($error)==0)?true:$error;
	}

}
?>