objective c - NSTableCellView / NSTextField did end editing notification -- without text change? -

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how can notification when textfield has ended editing (enter key pressed, clicked outside text field, clicked inside same column, outside text field, etc)

i checked 

- (void)textdidendediting:(nsnotification *)anotification {    //some code here }

but notification called when text has changed. need notified if no text changes have been made.

edit: sort of notification first responder has changed work well.

any ideas?

observe firstresponder state of window …

… [thewindow addobserver:self forkeypath:@"firstresponder" options:nskeyvalueobservingoptionold context:null]; …

… , read field editor's delegate:

- (void)observevalueforkeypath:(nsstring *)keypath ofobject:(id)object change:(nsdictionary *)change context:(void *)context {   if ([keypath isequaltostring:@"firstresponder"])   {     nsresponder *oldresponder =change[nskeyvaluechangeoldkey];     if ([oldresponder iskindofclass:[nstextview class]])     {       nstextview *editor = (nstextview*)oldresponder;       nstextfield *textfield = (nstextfield*)editor.delegate;       nslog(@"this text field lost focus: %@", textfield.identifier);     }   } }

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