MainWindow 0 0 400 300 GUIProjekt SS2015_SS Qt::Horizontal 40 20 Hello Qt World. Qt::Horizontal 40 20 0 0 400 29 Fi&le Edi&t Hel&p false &Exit &Preferences &About actionExit triggered() MainWindow close() -1 -1 199 149 actionPreferences triggered() MainWindow on_action_Preferences_triggered() -1 -1 199 149 on_action_Preferences_triggered()