Re: NSPredicateEditor
Re: NSPredicateEditor
- Subject: Re: NSPredicateEditor
- From: Peter Ammon <email@hidden>
- Date: Thu, 24 Jan 2008 14:23:12 -0800
On Jan 24, 2008, at 12:47 PM, Kimo wrote:
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?
Hi Kimo,
The right way to do this is to create two row templates. From its
templateViews method, the first one should return two views, like this:
[Start Date / End Date] [is today]
While the second one should return three views, like this:
[Start Date / End Date] [is the date / is before the date]
_DATE_PICKER_
(By [Start Date / End Date], I mean that view should be a popup
button with two items titled respectively Start Date and End Date).
NSPredicateEditor will notice the identical titles in the initial
popups of both templates, merge them together, and correctly show or
hide the date picker based on what is selected in the second popup.
Hope that helps,
-Peter
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