Donnal Walter <donnalcwalter@[...].com>  writes:

>  Sizers are extremely powerful, but it is common knowledge that they
>  can be equally confusing. IMHO there are two reasons for this
>  confusion. The first reason is that the arguments are far from
>  intuitive and perhaps Chris's API would help with this. (I have
>  taken a similar approach and implemented three keyword arguments:
>  resize, margin, and align.)

Yeah, border is an unfortunate choice of keywords, in that what a
sizer calls a border is really a margin of empty space, not a visible
line, which is what most would think of as a border.  Cascading style
sheets have margin (space around an element), border (visible line of
a certain color, style and width) and padding (space between the
element and its border).  Worse, the border parameter is really just
the border width.  The actual border depends on what type of border is
specified in the flags parameter, itself a mishmash of border and
resize behavior configuration options.

More unfortunate is the option parameter, which only applies to
BoxSizer, but is defined in the Sizer parent class, and isn't easily
ignored because it is the second parameter and comes before the flag
and border parameters.  And the wxWindows docs don't call it option,
they call it proportion, which is a bit more descriptive since it
determines the proportion of space allocated to the item in relation
to the space requested by all items in that particular BoxSizer.

I'm starting to think the entire sizer API is ripe for an overhaul.
If ever there was a place to deviate from wxWindows, surely this is a
pretty good one.

>  But the second source of confusion is that if one uses nested
>  windows (panels) and nested sizers to any degree, one ends up with
>  two entirely different containment hierarchies. The way I have
>  handled this is to build sizers into my panels, so that adding a
>  component to the panel automatically adds it to the sizer. No muss,
>  no fuss.

I think this is worth discussing as well.  Robin?  Any thoughts?

-- 
Patrick K. O'Brien
Orbtech      http://www.orbtech.com/web/pobrien
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