Hello everyone,
I'm a bit of a newbie here, but hopefully this question won't be too annoying.
:-)
My application contains several records displayed to the user in an NSTableView
bound to an NSArrayController. Because these records are complicated
(containing around thirty fields), I have implemented an Edit option where the
user can select one of rows in the table, click the Edit button, and have a new
window appear displaying all of the fields, radio buttons, numeric values, etc.
for changing.
I have implemented NSCopying on my data objects. When I go to display the edit
window, I get a reference to the selected object (myController arrangedObjects
/ selectionIndexes / objectAtIndex), copy the data into a new object for
editing ([myObject copy]) and then pass that off to the NSWindowController that
manages the editing process. I do this so that a Cancel from the editor window
will not affect the original object.
All of that seems to be straightforward enough.
My question is how to get the new, edited object back into the array controller.
I have implemented all of the KVC methods in the Manager class that supplies
the data to the NSArrayController, and they are being called for Add and
Delete. I've also coded a replaceObjectInMyArrayAtIndex:withObject: which I
would like to be called by the array controller when it swaps in the new object
for the old one. Although my current code does the same thing with separate
remove and insert calls (see below), that seems to lead to two undoable
actions, rather than the one I have coded in
replaceObjectInMyArrayAtIndex:withObject:
fSrcbook = [selArray objectAtIndex: selItem];
fEditbook = [fSrcbook copy];
// display editing window, etc.
if (returnCode == NSOKButton) {
NSArray * bka = [fArrayController arrangedObjects];
int row = [bka indexOfObjectIdenticalTo: fSrcItem];
[fArrayController removeObject: fSrcItem];
[fArrayController insertObject: fEditItem
atArrangedObjectIndex: row];
}
(I suppose I could put the remove/insert in an undo edit group, but I'd like to
keep my undo code out of this method, if possible. No particular reason, except
that it feels cleaner to me.)
I can't see anything in the NSArrayController class that will help me do the
replace directly, and nothing else relevant has popped up in my searching for a
solution. I admit, however, that I am sometimes blind to the obvious, and I
also may have used inadequate search terms. Still, I highly doubt I'm the first
person to want to do this, and it just seems like it should be possible to do a
replace directly.
And I am also wondering if this is the usual way to implement editing a
complicated object like I am attempting to do.
Any suggestions or clarifications would be greatly appreciated.
Thank you,
Bill
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