Colored ReportLab Frames

I'm currently working on improving the style of a medical report where I need to create colored ReportLab frames. I found someone else wondering if it's possible but no code example. So I wrote my own.

The original question: http://two.pairlist.net/pipermail/reportlab-users/2008-January/006654.html

The source code for the frame class: https://github.com/ejucovy/reportlab/blob/master/src/reportlab/platypus/frames.py

My implementation:

from reportlab.lib.colors import toColor

class ColorFrame(Frame):
    """ Extends the reportlab Frame with a background color. """

    def __init__(self, *args, **kwargs):
        self.background = kwargs.pop('background')
        super().__init__(*args, **kwargs)

    def drawBackground(self, canv):
        color = toColor(self.background)

        canv.saveState()
        canv.setFillColor(color)
        canv.rect(
            self._x1, self._y1,
            self._x2 - self._x1,
            self._y2 - self._y1,
            stroke=0, fill=1
        )
        canv.restoreState()

    def addFromList(self, drawlist, canv):
        if self.background:
            self.drawBackground(canv)
        Frame.addFromList(self, drawlist, canv)

With this example it is possible to do something like that:

f = ColorFrame(background='#0000ff')
f.addFromList(elements, canvas)

To get a frame with blue background.