enum SetPenParam<'a> {
    PenStyle(ffi::PenStyle),
    QColor(&'a QColor),
    QPen(&'a QPen),
}

impl From<ffi::PenStyle> for SetPenParam<'static> {
    fn from(value: ffi::PenStyle) -> Self {
        Self::PenStyle(value)
    }
}
impl<'a> From<&'a QColor> for SetPenParam<'a> {
    fn from(value: &'a QColor) -> Self {
        Self::QColor(value)
    }
}
impl<'a> From<&'a QPen> for SetPenParam<'a> {
    fn from(value: &'a QPen) -> Self {
        Self::QPen(value)
    }
}

impl QPainter {
    pub fn set_pen<'a, T: Into<SetPenParam<'a>>>(self: Pin<&mut QPainter>, pen: T) {
        match pen.into() {
            SetPenParam::PenStyle(style) => ffi::qpainter_set_pen_penstyle(self, style),
            SetPenParam::QColor(color) => ffi::qpainter_set_pen_qcolor(self, color),
            SetPenParam::QPen(pen) => ffi::qpainter_set_pen_qpen(self, pen),
        }
    }
}