How to cilck two button in the same time?

[tanthinh1510]

Hi all!
I development app by using qt android 5.5
I have 4 button, when I press one button, how to press button two, three, four (still pressing buttons 1)
example as picture below.
11655

thanks so much!

[alainstgt]

use signal/slot to propagate the signal emited by the first button