I am developing a custom textfield in Cocoa. To handle the backspace character
I should be defining :
- (void) keyUp: (NSEvent*)theEvent {
[self interpretKeyEvents: [NSArray arrayWithObject: theEvent];
NSString *text = [theEvent charactersIgnoringModifiers];
[[self text] appendString: text];
}
Then implement :
- (void) deleteBackward:(id)sender {
if ([[self text] length] == 0)
return;
NSString* textMinusLastCharacter = [[self text] substringToIndex: [[self
text] length] - 1];
[self setText: [NSMutableString stringWithString: textMinusLastCharacter]];
[self setNeedsDisplay:YES];
}
When I run the application, for every alphanumeric character key I press I hear
a sound. When I press the backspace key, a call is made to the deleteBackward:
and after that the key up method appends the backspace char to the end of the
string. How do I filter the backspace key press in a device independent manner
(without key codes).
Seems like the event is being passed to someplace else up in the responder
chain. How do I control that? I am avoiding comparing keyCodes that come
through the event object. I want to remove the sound played when each character
is pressed.
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