wxPython Flickering

lemon.png

reproduce.py

import wx

class Fader(object):
    def __init__(self, button):
        self.button = button
        self.val = 0

    def fade(self, time=1000):
        if self.val >= 255:
            self.val = 0
            return
        else:
            self.button.SetBackgroundColour(wx.Colour(self.val, self.val, self.val))
            self.val += 10
            wx.FutureCall(time / 50, lambda: self.fade(time))

def make_button(parent, image):
    button = wx.BitmapButton(parent)
    button.SetBitmapLabel(wx.Image(image).ConvertToBitmap())
    return button

if __name__ == "__main__":
    app = wx.App(False)
    frame = wx.Frame(None)
    button = make_button(frame, "lemon.png")
    fader = Fader(button)
    button.Bind(wx.EVT_BUTTON, lambda *x: fader.fade())

    frame.Show()
    app.MainLoop()