Attempts to show the specified tip at the current cursor location.

def show_tip(self, point, tip):
        """
        Attempts to show the specified tip at the current cursor location.
        """
        # Don't attempt to show it if it's already visible and the text
        # to be displayed is the same as the one displayed before.
        if self.isVisible():
            if self.tip == tip:
                return True
            else:
                self.hide()

        # Set the text and resize the widget accordingly.
        self.tip = tip
        self.setText(tip)
        self.resize(self.sizeHint())
        self.move(point)
        self.show()
        return True