Thread-topic: matrixes, custom cells, prototypes, and drawing
User-agent: Microsoft-Entourage/11.2.1.051004
>> I have an NSMatrix (actually, it's a subclass, MyMatrix) whose cell is a
>> custom NSCell type, i.e. MyCell. I couldn't find a way in Interface Builder
>> to specify that the whole matrix should use MyCell, so in Interface Builder I
>> made the NSMatrix be one cell, an NSButtonCell, and then I used Custom Class
>> to set that one cell to MyCell (which is an NSButtonCell subclass for this
>> sole reason). Then, in my app, in the matrix's awakeFromNib, I set the
>> matrix's prototype and add a row with addRow. So now we've got two rows and
>> they are both displaying MyCell.
>>
>> The weird thing is that the two rows behave very differently when they
>> redraw. The second row, the one added in code, gets redraw messages far more
>> often than the first row; and when it does, it redraws over the old drawing,
>> so that as time goes on it gets darker and darker and fuzzier and fuzzier.
>> Meanwhile, the first row, the one specified in IB, redraws just fine.
>>
>> I can think of ways to work around this, but my question is: why? What's
>> causing this difference in redraw behavior? Thx. m.
>>
> Further to this: Using Quartz Debug I can see also that there is a big
> difference between the way the original cell redraws and the way the new cell
> redraws. The original cell flashes a complete rectangle when it redraws, but
> the added cell just flashes in the areas of the cell where my
> drawInteriorWithFrame explicitly draws. Again, the question is: how can it be
> that two cells with the same class are behaving so differently? Thx m.
Solved it, thanks to Eric Morand's note:
<http://www.cocoabuilder.com/archive/message/cocoa/2005/9/8/145918>
I still don't understand why the IB-created cell and the code-created cell
would behave differently, though. m.
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