My custom view implements -optionDescriptionsForBinding: as follows:
- (NSArray *)optionDescriptionsForBinding:(NSString *)binding {
NSMutableArray *descs = [NSMutableArray arrayWithArray:[super
optionDescriptionsForBinding:binding]];
if([binding isEqualToString:@“foo"]) {
NSAttributeDescription *desc = [[[NSAttributeDescription alloc] init]
autorelease];
[desc setName:NSConditionallySetsHiddenBindingOption];
[desc setAttributeType:NSBooleanAttributeType];
[desc setDefaultValue:[NSNumber numberWithBool:NO]];
[descs addObject:desc];
desc = [[[NSAttributeDescription alloc] init] autorelease];
[desc setName:NSConditionallySetsEnabledBindingOption];
[desc setAttributeType:NSBooleanAttributeType];
[desc setDefaultValue:[NSNumber numberWithBool:NO]];
[descs addObject:desc];
desc = [[[NSAttributeDescription alloc] init] autorelease];
[desc setName:NSConditionallySetsEditableBindingOption];
[desc setAttributeType:NSBooleanAttributeType];
[desc setDefaultValue:[NSNumber numberWithBool:YES]];
[descs addObject:desc];
}
return descs;
}
As expected, this causes Interface Builder to show the checkboxes for these
three options. However, if I try to click one of them,
bind:toObject:withKeyPath:options: gets called twice — the first time with
these three options properly present in the options dictionary, but the second
time with the options dictionary set to nil (or to a dictionary containing
nothing but the value transformer, if there is one). The result of this is that
trying to click one of the check boxes causes the checkbox to change
momentarily but then flicker back to the default setting, and there’s no way to
actually set these binding options.
What’s more, I had a look at some of the standard Cocoa views that implement
bindings, such as NSTextView, and discovered that sending
-optionDescriptionsForBinding: to them returns an empty array — yet, the
aforementioned options appear for these views in Interface Builder. So is there
some other, better way to make “Conditionally sets enabled” and friends show up
for a view other than returning those options in
-optionDescriptionsForBinding:? What’s the approved way to do it?
Thanks,
Charles_______________________________________________
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