def getNewButtonLabel(self):
'''
Requests a new button label from the user.
Returns None if user canceled out, or a string
with the new button label.
@return: None if user canceled, else string from input field.
@rtype: {None | string}
'''
prompt = "New label for this button:";
dialogBox = QInputDialog(parent=self);
dialogBox.setStyleSheet(SpeakEasyGUI.stylesheetAppBG);
dialogBox.setLabelText(prompt);
dialogBox.setCancelButtonText("Keep existing label");
userChoice = dialogBox.exec_();
if userChoice == QDialog.Accepted:
return dialogBox.textValue();
else:
return None;
