MainWindow 0 0 367 526 MainWindow 20 40 321 71 0 0 Qt::RightToLeft true Hello 10 140 340 341 0 0 0 0 CE 0 0 C 0 0 DEL 0 0 ÷ 0 0 7 0 0 8 0 0 9 0 0 × 0 0 4 0 0 5 0 0 6 0 0 - 0 0 1 0 0 2 0 0 3 0 0 + 0 0 +/- 0 0 0 0 0 . 0 0 = 0 0 367 20