On 19 Feb 2009, at 11:45 am, Walker Argendeli wrote:
'm just having a bit of trouble getting this to work. First off, I
wasn't 100% certain about which should be buttonCell and which
should be self, although I think I got all of that right. how does
startTrackingAt:startPoint:inView: get called, however?
Again, sorry for my ignorance, but I'm just getting started with
Cocoa.
Thanks for your help, and the code!
I'm not quite sure what you've done here. What's the outlet
'buttonCell' refer to? This *IS* the button cell, it doesn't need to
refer to another one. I'd get rid of that and replace all uses of it
with 'self', as per the original code.
Note that you're not subclassing the button here, you are subclassing
its cell. Your class name maybe ought to reflect that as it currently
suggests that it's a subclass of a button, even though clearly it isn't.
In IB, let's say you've dragged a button into your window. To
customise the cell class, drill down into the button (keep clicking
it) until the cell is selected (keep an eye on the inspector palette
so you know when this is). Then in the 'Identity' (i symbol) section
of the inspector palette, enter the name of your custom class in the
field marked 'Class'. That should be all you need to do to make the
button use your custom cell subclass.
Don't forget to:
a) include the code in your project, and
b) hook up a menu to the cell so that it does have something to pop up.
You also need to set the 'showsMenuAfterDelay' to YES somewhere. It'll
default to NO unless you set it, so you might also want to add an -
awakeFromNib method to your code and set this to YES there.
-startTrackingAt:startPoint:inView: gets called when the mouse is
clicked in the button. This is a method of the normal NSButtonCell
that is being overridden here.
--Graham
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