Re: intercepting keydowns

FROM : Douglas Davidson
DATE : Mon Apr 04 17:43:57 2005

On Apr 2, 2005, at 12:35 PM, Satoshi Matsumoto wrote:

> on 05.4.3 1:59 AM, Roland Silver at <email_removed> wrote:
>

>> I have a simple Cocoa application with a controller and a window with
>> an NSTextView. I want to intercept keydown events on their way to the
>> text view, process them with a function or method, and send a 
>> possibly
>> different keydown event on to the text view.
>> Nothing I try works.
>> Any suggestions?
>>

>
> Subclass NSTextView and override following method.
>
> - (void)keyDown:(NSEvent *)theEvent
>


I want to again recommend against subclassing NSTextView and 
overriding keyDown: except in extreme circumstances.  In most cases 
it is better to act as the text view's delegate and handle 
textView:doCommandBySelector:, 
textView:shouldChangeTextInRange:replacementString:, 
textView:willChangeSelectionFromCharacterRange:toCharacterRange:, and 
so forth.  You should override keyDown: if you want to handle raw key 
presses before any input methods or key bindings have been applied; 
if you do not want that, then you should avoid overriding keyDown:.

Douglas Davidson