[pygtk] custom cairo widget

[M.B.]

hi all,
im trying write my first custom widget.
its cairo slider. on my first look im happy :) but i know that code is
ugly. if this code running, Xorg is on 50% and python thread is on 49%
CPU !!!. ( using 'top' in console ).
Kick me to the right way with this code snipet pls.
where is error ? Why too much cpu power ?

PS: sry for my english.
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