On 05/06/2009, at 11:29 AM, Joar Wingfors wrote:
On 4 jun 2009, at 18.10, Graham Cox wrote:
There's a note in the documentation for -validateToolbarItem: that
"NSToolbar only calls this method for image items", which might
explain it. So what do I need to do to make this work for the
segmented control? I've read all the toolbar and validation
documentation I can find but I'm none the wiser - nothing so far
stands out as the obvious right way to proceed.
I like to back all of my view-type toolbar items by separate view
controllers. In this design it is the job of these view controllers
to monitor the state of your application that affects their views,
and update the enabled / selected state appropriately. Your views,
or view controllers, can often times use bindings to achieve this
with minimal fuss and overhead. There is no built in support in
NSToolbar for managing view controllers for your view-type toolbar
items, so you would have to manage that part for yourself.
Thanks a lot - this is working out well so far.
Follow-up question: how can I turn OFF a segment in a segmented
control? The situation is this:
The segmented control represents text alignment - left, center, right,
justified. Only one can be on at a time normally, but if I select a
non-text object that doesn't respond to the alignment settings, I want
to disable the control and turn off all the segments. I can disable it
alright, but there doesn't seem to be a way to turn all segments off -
passing -1 to selectSegmentWithTag: doesn't do anything, -
setSelectedSegment: with -1 produces an out of range exception, even
though its counterpart -selectedSegment, returns -1 for no selection.
Any ideas?
--Graham
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