def __init__(self, parent=None):
super(CalculatorDialog, self).__init__(parent)
self.ui = Ui_MainWindow()
self.ui.setupUi(self)
self.prepare_connections()
class CalculatorDialog(QMainWindow):
def __init__(self, parent=None):
super(CalculatorDialog, self).__init__(parent)
self.ui = Ui_MainWindow()
self.ui.setupUi(self)
self.prepare_connections()
def prepare_connections(self):
for num in range(0,10):
btn = self.ui.__dict__['button_' + str(num)]
self.connect(btn, SIGNAL("clicked()"), self.digit_pressed)
for op in ["Plus", "Minus", "Mult", "Div"]:
btn = self.ui.__dict__['button' + op]
self.connect(btn, SIGNAL("clicked()"), self.operator_pressed)
def digit_pressed(self):
pressedBtn = self.sender()
self.handle_digit(pressedBtn.text())
def operator_pressed(self):
pressedBtn = self.sender()
self.handle_operator(pressedBtn.text())
def on_buttonCE_clicked(self):
self.ui.display.setText("")
def on_buttonRes_clicked(self):
self.handle_equals()
def handle_digit(self, digitchar):
display = self.ui.display
display.setText(self._display_txt() + digitchar)
def handle_operator(self, opchar):
display = self.ui.display
if self._last_display_char_is_digit():
display.setText(self._display_txt() + opchar)
def handle_equals(self):
display = self.ui.display
if self._last_display_char_is_digit():
self._compute_result()
def keyPressEvent(self, event):
key = str(event.text())
if key.isdigit():
self.handle_digit(key)
elif key in ["+", "-", "*", "/"]:
self.handle_operator(key)
elif event.matches(QKeySequence.InsertParagraphSeparator):
self.handle_equals()
else:
super(CalculatorDialog, self).keyPressEvent(event)
def _display_txt(self):
return str(self.ui.display.text())
def _last_display_char_is_digit(self):
txt = self._display_txt()
return txt and txt[-1].isdigit()
def _compute_result(self):
res = eval(self._display_txt())
self.ui.display.setText(str(res))
