[Mono-bugs] [Bug 531591] TableLayoutPanel.SetColumnSpan does not display all cells with ColumnStyle AutoSize

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http://bugzilla.novell.com/show_bug.cgi?id=531591

User timotheus.pokorra at gmail.com added comment
http://bugzilla.novell.com/show_bug.cgi?id=531591#c1





--- Comment #1 from Timotheus Pokorra <timotheus.pokorra at gmail.com>  2009-08-22 16:54:40 MDT ---
I have now investigated this issue further.

I had a look at
http://anonsvn.mono-project.com/viewvc/trunk/mcs/class/Managed.Windows.Forms/System.Windows.Forms.Layout/TableLayout.cs

In TableLayout::CalculateColumnRowSizes, when calculating the maximum width per
column, it skips the controls that span several columns. To some degree this
makes sense, because the control width on this column is hard to calculate.

But if there is no other row with a column that belongs only into this column,
the  max_width will be 0, and the column will not be visible.

It does not make much sense to have such a scenario, with 2 columns always
being spanned (I wanted to auto generate forms, and assign a label and a
control each to one column; in some cases, eg. checkboxes, I span the 2
columns; now if in one panel, there are only checkboxes, the scenario would
occur). 
But it works fine on the .net Winforms, therefore I am wondering if it would be
good if there is a solution for this on Mono as well.

I will attach a possible solution for this.
I have no idea if this is a good solution, but perhaps it gives a good start to
a nice solution!

Thanks,
  Timo

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