On 25 Feb 2012, at 7:10 AM, Graham Cox wrote:
> I was surprised to find I couldn't set whether the color panel displayed the
> opacity slider depending on which colour well was selected. Can anyone think
> of a way I could achieve that? Seems to me that the color well/color panel
> communication is a totally closed book - I've already got various workarounds
> to overcome other issues with this communication, but with this one it's
> looking like I'm going to have to throw out NSColorWell and just do it myself
> from scratch. I thought frameworks were supposed to help, not hinder?
What I'd try next would be to subclass NSColorWell and override -activate: and
-deactivate, and send the shared color panel -setShowsAlpha: accordingly.
If you have a lot of wells, that may be a lot of work. It might reduce the work
if your subclass had a property controlling whether to ask for the alpha
slider, and use User Defined Runtime Attributes (Identity inspector) to set it
at load time.
— F
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