/**
* Starts displaying the progress bar, with optional heading and a special
* div so it can be hidden later.
*
* @see core_backup_display_progress::start_html()
*/
public function start_html()
{
global $OUTPUT;
$this->id = 'core_backup_display_progress_if_slow' . self::$nextid;
self::$nextid++;
// Containing div includes a CSS class so that it can be themed if required,
// and an id so it can be automatically hidden at end.
echo html_writer::start_div('core_backup_display_progress_if_slow', array('id' => $this->id));
// Display optional heading.
if ($this->heading !== '') {
echo $OUTPUT->heading($this->heading, 3);
}
// Use base class to display progress bar.
parent::start_html();
}
