def __onDisplayLetterKey(self,event):
if (FUF.hasModifier(event.modifiers()) == False) or (FUF.onlyShiftModifier(event.modifiers()) == True):
self.deleteSelectText(False)
indexPos = self.document().insertText(self.cursor().getCursorIndexPos(), event.text())
self.cursor().setGlobalCursorPos(indexPos)
self.update()
elif FUF.onlyCtrlModifier(event.modifiers()):
self.onQuickCtrlKeySignal.emit(event.key())
elif FUF.onlyAltModifier(event.modifiers()):
self.onQuickAltKeySignal.emit(event.key())
