Thread-topic: matrixes, custom cells, prototypes, and drawing
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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.
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