[cairo] How to refer Cairo::Context outside on_expose_event

[Murray Cumming]

On Mon, 2009-05-04 at 10:14 +0800, 陈凯 wrote:
> Unfortunately, the execution always crashes because get_window() in
> the constructor returns NULL. 

That's because get_window() never returns the GDK window until the
widget is realized. That means that the earliest you can discover it is
in on_realize().

But I don't know if you can keep the cairo context like that instead of
getting it each time.

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