def check_color_input(value):
"""Check a value is a valid colour input.
Returns a parsed `RGBColor` instance if so, raises ValueError
otherwise.
"""
value = value.lower()
# Trim a leading hash
if value.startswith("#"):
value = value[1:]
if len(value) != 6:
raise ValueError(
"Color should be six hexadecimal digits, got %r (%s)" %
(value, len(value)))
if re.sub(r"[a-f0-9]", "", value):
raise ValueError("Color should only contain hex characters, got %r" %
value)
red = int(value[0:2], base=16)
green = int(value[2:4], base=16)
blue = int(value[4:6], base=16)
return RGBColor(red, green, blue)
def __init__(self, color=None):
"""Initialize with a color (default is black"""
Gtk.AspectFrame.__init__(self,
xalign=0.5,
yalign=0.5,
ratio=1.0,
obey_child=False)
self.set_shadow_type(Gtk.ShadowType.IN)
self.drawingarea = Gtk.DrawingArea()
self.add(self.drawingarea)
if color is None:
color = RGBColor(0, 0, 0)
self._color = color
self.drawingarea.set_size_request(8, 8)
self.drawingarea.connect("draw", self._draw_cb)
