The QStatusBar class provides a horizontal bar suitable for presenting status messages. ... void  clear  ()  . ... Each status message falls into one of three classes: . ... Normal and permanent messages are displayed by creating a widget (typically a QLabel ) and using addWidget () to add this widget to the status bar. ... Adds widget to this status bar, with a width of stretch. widget is permanently visible if permanent is TRUE, and is obscured by temporary messages if permanent is FALSE. ...