On 5 Apr 2017, at 10:45, J.E. Schotsman <jesc...@xs4all.nl> wrote:
>
> On 03 Apr 2017, at 21:00, J.E. Schotsman wrote:
>>
>> What is the Cocoa way of enabling/disabling a group of controls?
>> In Carbon I used to use a user pane for that.
>> I thought I would try an NSBox but then I realized it is not a control.
>
> Nobody?
> I thought this would be a simple and solved problem.
> I tried subclassing MyEmbedder:NSControl and embedding in a custom view of
> class MyEmbedder.
> Alas, setting the isEnabled property of the custom view has no effect on the
> embedded controls.
> What am I missing?
I started writing a reply, then decided I was too busy and others would
respond. Since they haven’t, here’s my two cents:
1. AFAIK there isn’t a mechanism to disable all controls in a given subview.
You could write code to do this easily enough, e.g.
for (NSView *child in [groupView subviews]) {
if ([child respondsToSelector:@selector(setEnabled:)])
[child setEnabled:NO];
}
or you can bind all the Enable properties in the UI editor to the same value
using bindings.
2. For some types of control, for instance toolbar buttons and menus, there’s a
validation mechanism; you can just implement -validateUserInterfaceItem: and
return YES or NO as appropriate.
3. It’s possible, at least in theory, to make your own controls conform to
NSValidatedUserInterfaceItem, if that seems appropriate. (This is kind of a
gold-plated solution, and only applies in any case to controls with a target.)
You’d probably want to start by reading about user interface validation:
<https://developer.apple.com/library/content/documentation/Cocoa/Conceptual/UIValidation/UIValidation.html>
Kind regards,
Alastair.
--
http://alastairs-place.net
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