Re: NSPredicateEditor
Re: NSPredicateEditor
- Subject: Re: NSPredicateEditor
- From: Kimo <email@hidden>
- Date: Thu, 24 Jan 2008 12:47:55 -0800
On Jan 7, 2008, at 4:08 PM, Peter Ammon wrote:
On Jan 7, 2008, at 3:34 PM, Kimo wrote:
I'm using the NSPredicateEditor template in IB, and it works well.
The exception is with a BOOL value. For example, if I have a BOOL
value called flag, and I want to use the string (flag == 1),
however, using the NSPredicateEditor always produces the string
(flag == "1") which doesn't work. Is there an option to create the
string without the quotes? Or is there some setting in
NSPredicateEditor I'm not aware of?
TIA.
Hi Kimo,
If you want to have the boolean option be represented by a text
field, you can of course just select the Numbers type for the right
expression. That will coerce the right expressions to a numeric
type and give you a string like flag == 1.
If (more likely) you want the boolean value to be represented by a
popup, this can't yet be configured in IB, but it is easy to do
programmatically. Create an NSPredicateEditorRowTemplate with left
expressions your key path expressions, and right expressions as
constant expressions containing your boolean values. Then you can
configure the view titles and all the rest by modifying the
templateViews.
Let me know if you have any questions,
-Peter
Hi Peter,
That helped a lot, thank you. I have another question. I created
(programmatically) a NSPredicateEditorRowTemplate so that the left
popup button has "Start Date" and "End Date." The middle popup button
has "is today" and "is the date" and "is before the date." The right
expression is a NSDatePicker. However, when the user selects the
operator "is today" I want the NSDatePicker to be hidden, and then
visible for the other two operators.
I see other apps do this (Mail for example), but I can't seem to
accomplish the same thing. I subclassed NSPredicateEditorRowTemplate
so I could alter the templateViews, but I can't seem to determine
which middle popup is selected. What is the best way to hide the
NSDatePicker when the user selects the menu item "is today" and then
displays it for the other menu items?
Thanks in advance!
-Kimo
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