[BLACKBOX] 'unit'

From: Douglas G. Danforth <"Douglas>
Date: Tue, 4 Mar 2008 14:17:42 -0800

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If one has a pointer, f, to a Ports.Frame or Views.Frame then one has access
to f.unit. If one does not have such a pointer then how can one find the
value of the unit?

For example, when implementing HandlePropMsg for MyView which is
an extension of Views.View the specification of size in Properties.SizePref
has the quantities msg.h and msg.w specified in universal units. If I knew
unit this would be trivial but I don't. Am I expected to do some
calculations
based on 1/36000 of a millimeter and pixel size? That sounds like a kludge.
I have not been able to find any module within the BB framework that exports
the value of 'unit'. Only Ports.Frame and Views.Frame export the unit but
embedded in the pointers to a frame.

What must I do to obtain the value of 'unit', or equivalently be able to
specify
sizes in universal units when I think in pixels?

-Doug Danforth

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Received on Tue Mar 04 2008 - 23:17:42 UTC