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NSControlTextDidChangeNotification fires only once upon setting delegate
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NSControlTextDidChangeNotification fires only once upon setting delegate


  • Subject: NSControlTextDidChangeNotification fires only once upon setting delegate
  • From: email@hidden
  • Date: Fri, 28 Sep 2007 19:01:44 -0700

Hello list.

I'm trying to implement a Safari-style address field with completion. I'm using an ImageAndTextCell in an NSMatrix, and trying to leverage the built-in completion by doing the following in my controller code:

* Observe NSControlTextDidChangeNotification notifications from the NSMatrix.
* When the NSControlTextDidChangeNotification arrives, get the field editor for the ImageAndTextCell, and set the field editor's delegate to my controller, so that I get textView:completions:forPartialWordRange:indexOfSelectedItem: delegate calls.
* In textView:completions:forPartialWordRange:indexOfSelectedItem:, I fetch the matching items and return them.


This works as expected, but only the first time, that is, when I type the first character in the field. It fills in the field and selects the part following the keyboard input, and displays the pull-down list with that item selected. However, I do not get NSControlTextDidChangeNotification for subsequent key presses, hence no completion and no pull-down.

If I comment out the body of the NSControlTextDidChangeNotification handler and replace it with an NSLog, I see it is called as expected for all characters. Setting the delegate seems to be enough to cause the problem.

Am I doing something wrong in my delegate that keeps subsequent notifications from firing? I have tried google searches and read the NSTextView class documentation, and I'm stuck.

Is this the wrong approach? Any suggestions are welcome.

Thank you.

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