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Message from discussion Bug in row.height ?
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John Machin  
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 More options Dec 30 2009, 10:10 pm
From: John Machin <sjmac...@lexicon.net>
Date: Thu, 31 Dec 2009 14:10:31 +1100
Local: Wed, Dec 30 2009 10:10 pm
Subject: Re: [pyxl] Bug in row.height ?
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On 31/12/2009 1:00 PM, John Yeung wrote:

> If only I had read this more carefully when I first opened it, I could
> have saved myself hours of painful BIFF-documentation-reading and
> bit-by-bit (byte-reversed!) file inspection.  (More comments below.)

A wise person once said: You can lead a horse to water, tie a brick to
its nose, and kick it in the fundament with a size 12 Doc but you can't
make it drink :-)

> On Mon, Dec 28, 2009 at 6:18 PM, John Machin <sjmac...@lexicon.net> wrote:
>> Assuming hidden=0, collapsed=0, has_default_height=0, as far as I can
>> tell the following rules are applied:

>> A. If height_mismatch is true, Excel will use the requested height. In
>> other words, font doesn't match requested height, so go with the
>> requested height. If the font is small, you get space. If the font is
>> large, you get chopped characters.

>> B. Else: (1) Excel will calculate a row height high enough to accomodate
>> the tallest font used in the row. (2) If any cell in the row is styled
>> with "alignment: wrap on" and the text is too long to fit in the column
>> width, Excel will calculate a row height sufficient to accomodate
>> wrapping all such cells within their column width.

> Given behavior A (which I independently discovered through much effort
> earlier today), I suggest the "tutorial" (de facto manual, available
> at python-excel.org as python-excel.pdf) be updated, because it
> currently says

> "Do not be fooled by the height attribute of the Row class, it does
> nothing.  Specify a style on the row and set its font height attribute
> instead."

That's a very sound suggestion.

> The height attribute certainly does more than nothing when combined
> with height_mismatch.  The font-based solution has its merits, but
> isn't a perfect substitute for being able to pick a specific row
> height.

> As a vague idea (weaker than a suggestion), it might be easier, or at
> least less cryptic, to add a Row.set_height method and point people to
> it in the tutorial, than to explain in the tutorial that they have to
> set both height and height_mismatch.

Your vague idea covers behaviour A, leaving the tutorial to explain that
if behaviour B is required, they must not set height_mismatch to True
etc etc. Your proposed method would do nothing else but set the height
attribute to the arg value and setting height_mismatch to 1. Do you plan
on not documenting why height_mismatch is set to 1? Perhaps you'd like
to explain what you mean by "easier" and "less cryptic".

> Oh, it might be useful to mention that the reason I was investigating
> setting the row height in the first place was because I couldn't coax
> Excel into doing automatic height adjustment to accommodate wrapped
> text in merged cells.

I presume you didn't read far enough into that cryptic message to get to
the mention of the demo script :-(

>  (As far as I can tell, this is a bug in Excel
> 2000 and doesn't imply any deficiency in xlwt.)

Can you produce the required behaviour using the Excel UI?

Cheers,
John


 
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