Re: NSComboBox and bindings
Re: NSComboBox and bindings
- Subject: Re: NSComboBox and bindings
- From: Ivan Myrvold <email@hidden>
- Date: Thu, 27 May 2004 08:23:06 +0200
My problem was that I really didn't understand the meanings of content,
contentValues and values. Your help have given these value selections
more meaning to me, and I think I understand this better now. The
bricks seems to have fallen into place. Thank you again.
Ivan
Pe 26. mai. 2004 kl. 18.48 skrev Fritz Anderson:
The problem is that a combo box is not a popup menu:
A popup menu represents a choice of an immutable value from an
immutable array of choices.
A combo box represents an arbitrary value, which is coordinated with
an array of choices, which the programmer may make mutable -- for
instance by adding each new entry in the field to the array. There is
no question of selecting an indexed member of the list, as it is
permissible to enter a string that isn't a member of the list.
Binding the value of an NSComboBox to a property of an
NSArrayController's selection would therefore be expected to edit the
property of the selected item itself. It's hard to see what else to
expect, as the mutability and content of the contentValues are at the
option of the programmer.
The experiment that I found works is:
-- Bind the contentValues to arrangedObjects.name
-- Bind the value to some property of the NSObjectController that
owns the array from which the arrangedObjects were drawn. This has to
be independent of the array and the selection of the
NSArrayController, because (I repeat) NSComboBox doesn't really deal
in selection from a list except as a convenience in filling in a text
field. It's a text field, not a menu.
-- In the setter method for the value property, modify the
contentValues array, if desired.
-- F
On 26 May 2004, at 9:02 AM, Ivan Myrvold wrote:
I see exactly the same problem. I didn't see any answer of this
posting. Have anyone an answer to this?
Ivan
Pe 17. des. 2003 kl. 23.28 skrev David Webster:
Hi list,
Am I doing something wrong or is this a bug? The following is
reduced to the simplest I can make it.
I have a NSComboBox a NSArrayController and a model class with a
"name" instance variable with KVC compliant accessors. I have set
the following:
NSArrayController's - Object Class Name: to the model class
NSComboBox's bindings to:-
content ->
BindTo: NSArrayController
Controller Key: arrangedObjects
Model Key Path:
contentValues ->
BindTo: NSArrayController
Controller Key: arrangedObjects
Model Key Path: name
value->
BindTo: NSArrayController
Controller Key: selection (Note: have tried all other
combinations as well)
Model Key Path: name
I also have an Add button hooked up to the Add: action method on
NSArrayController
Repeat 3X {
Hit Add, edit the combo field followed by <cr>
}
If I drop down the list I have, for example
Item1
Item2
Item3 <- this is highlighted as it was the last item entered
If I NSLog() the contents of the NSArrayController I get the same
three strings - everything OK so far!
Now if I select Item1 from the list, for example, the text field
shows Item1 as expected but if I drop the list down again I have
Item1
Item2
Item1
if I output the contents of the NSArrayController I also have the
above.
It would seem that the NSArrayController is updating the last
selected position but with the newly selected list item.
A bug or just me?
Thanks
David
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Ivan C Myrvold
OrtopediService AS
Mob. 913 16 356
Tlf. 38 14 45 93
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