Hi,
I'm adding a custom user setting to a NSPrintPanel by adding an "accessory view
controller" for a view that contains just one control (a checkbox) and which is
loaded from a nib file. The checkbox's value has a binding to the view
controller's "representedObject.printSettings.checkboxvalue" keypath. (The
representedObject is a NSPrintInfo object).
I have been able to verify that this binding works correctly.
One thing I haven't gotten to work yet, is to automatically update the
"preview" in the print panel when I chance the state of the checkbox. The
preview updates itself correctly when I change one of the "built-in" settings,
and it even correctly represents my own custom setting. But, how can I trigger
an automatic update when I just change my own custom setting?
I assume I should implement the "keyPathsForValuesAffectingPreview" protocol
method in my accessory view controller, which I did, but so far without
success. Here's my implementation:
- (NSSet *)keyPathsForValuesAffectingPreview
{
return [NSSet setWithObjects:
[NSString
stringWithFormat:@"representedObject.printSettings.checkboxvalue"],
nil];
}
Any help much appreciated.
--
Luc Van Bogaert
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