Re: Ephemeral Changes

FROM : Jens Miltner
DATE : Thu Mar 27 14:46:14 2008

Am 27.03.2008 um 11:57 schrieb Gerriet M. Denkmann:
> On 26 Mar 2008, at 22:56, Graham Cox wrote:

>> The undo manager will directly change the data in the text view 
>> using an invocation or target/action - it doesn't go back through 
>> changeFont: normally, which is really a "high level" method.
>>
>> Maybe the solution to this is to subclass NSUndoManager so that you 
>> can hook into the undo and redo methods and use those opportunities 
>> to modify the change count of the document.

>
> So I implement in MyUndoManager:
> - (void)undo
> {
>     NSString *action = [self undoActionName];
>     [ super undo ];
>     if ( action contains "Font" ) [myDocument 
> updateChangeCount:NSChangeUndone];
> }
>


Maybe there's a way to trigger on the action selector instead of the 
action name? However, even the action selector _might_ change in 
future AppKit versions, so even this would be a somewhat fragile 
solution.

I'd still think that it might be easier to register you own undo 
action for the font changes instead of trying to hijack the automatic 
undo...

just my €.02,
</jum>