Re: Controlling field editor for an outline view

FROM : John Stiles
DATE : Fri Jan 11 04:05:23 2008

Honestly, I've implemented a custom NSFormatter before, and it's way 
more code than just replacing the contents of the field editor. :)


On Jan 10, 2008, at 5:15 PM, Ken Thomases wrote:

> Are you perhaps still over-thinking?  Can you use NSFormatter and 
> its editingStringForObjectValue: method?
>
> Logically, the object value would be $(BUILD_LOC) and the formatter 
> would perform the substitution and show the resulting string.  When 
> editing, it would revert to the "real" value.
>
> -Ken
>
> On Jan 8, 2008, at 8:32 PM, John Stiles wrote:
>

>> I think I was over-thinking the problem. Since I'm starting the 
>> edit programmatically, after I call -editColumn:etc:, I just need 
>> to grab the field editor with [[myOutlineView window] 
>> fieldEditor:YES forObject:myOutlineView], and then call 
>> [fieldEditor setString:myNewString]. Voila, it's done.
>>
>> If I had to support regular edits (initiated by slow-clicking in a 
>> cell), I could probably put a -performSelector:afterDelay: in -
>> setUpFieldEditorAttributes: and provide a zero delay. This would 
>> give the field editor a chance to get warmed up, and then I could 
>> swoop in and replace its contents.
>>
>> FWIW, it looks like Xcode is doing something hokey here. If you 
>> watch closely, when you click on it to begin an edit, it actually 
>> visibly changes the cell's contents, and then editing begins 1/10 
>> of a second later. If you time your clicks just right, you can 
>> confuse it and it will leave cells in the "wrong" state (showing $
>> (STUFF) instead of a real path). Whoops! :)
>>
>>
>> John Stiles wrote:

>>> I thought I found a good workaround. -setUpFieldEditorAttributes: 
>>> is, in fact, called whenever editing begins. However, it doesn't 
>>> seem to work. I tried this:
>>>
>>> -(NSText*) setUpFieldEditorAttributes:(NSText*)textObj {
>>>    [textObj setString:@"This is a test"];
>>>    return textObj;
>>> }
>>>
>>> My code was definitely being called. But the field editor didn't 
>>> change its contents! "This is a test" never appeared.
>>> :(
>>> How is Xcode managing this trick??
>>>
>>>
>>> John Stiles wrote:

>>>> I'm trying to set up a custom field editor for an NSOutlineView. 
>>>> When it displays, its contents are not necessarily the same as 
>>>> the cell being displayed by the outline view. For instance, 
>>>> consider the Xcode project settings dialog—it has a table that 
>>>> displays stuff like:
>>>>    Build Location            /Volumes/MyDrive/MyFolder
>>>>
>>>> But when you go to edit it, it changes to
>>>>    Build Location            $(BUILD_LOC)
>>>>
>>>> I'm basically trying to do something similar to that. So how is 
>>>> this done?
>>>>
>>>> If it matters, I'm beginning the edit session programmatically 
>>>> (in this case, in response to a menu selection). I suppose in 
>>>> this case I might be able to get away with changing the cell's 
>>>> string just before the edit begins, and change it back as soon 
>>>> as the edit completes, but that's pretty hokey; I think it would 
>>>> be a cleaner solution to just put the appropriate text in the 
>>>> field editor and leave the cell's string alone. I just can't 
>>>> manage to make it work though.
>>>>
>>>> I've tried using the delegate method -
>>>> control:textShouldBeginEditing: but this was a total bust; it's 
>>>> not called until the user begins typing.
>>>>
>>>> I've also tried adding -
>>>> editWithFrame:inView:editor:delegate:event: to my NSCell 
>>>> subclass but this did not seem to ever be called, strangely. (I 
>>>> did notice that -selectWithFrame:inView:… etc. /is/ being 
>>>> called, but that is probably because I am using "select:YES" in 
>>>> my call to -editColumn:row:withEvent:select:.)
>>>>
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