Draws cell background to context

def draw(self):
        """Draws cell background to context"""

        self.context.set_source_rgb(*self._get_background_color())
        self.context.rectangle(*self.rect)
        self.context.fill()

        # If show frozen is active, show frozen pattern
        if self.view_frozen and self.cell_attributes[self.key]["frozen"]:
            self._draw_frozen_pattern()