How to handle backspace in NSComboBox with swift 5

Question

I have NSComboBox with external datadource and I'm using method:

(NSString *)comboBox:(NSComboBox *)aComboBox completedString:(NSString *)string

to complete string with suggestions, everything is working all right except when I press backspace, it won't autocomplete. I have tried to debug and it didn't even call this method on backspace. I have also tried call it directly from method:

-(void)controlTextDidChange:(NSNotification *)notification

but it wont select completed string that way. My question is what am I doing wrong? Is there better way to handle delete or I should just try to select completed text programmatically?

What is your expected behaviour when the user presses delete? — Aderstedt, Nov 09 '15 at 13:38
Good example is in Photoshop when you are choosing fonts: it should delete letter from control text, but make suggestion which should be selected, so when you type you can retype throught selected (sugested area)) — Zuzana Paulis, Nov 09 '15 at 13:49

score 1 · Accepted Answer · answered Nov 10 '15 at 15:04

1

Use controlTextDidChange to detect when backspace was pressed, then trigger completion manually using complete on NSTextView:

-(void)controlTextDidChange:(NSNotification *)notification {
    if (... /* backspace pressed */) {
        NSTextField *textField = [[notification userInfo] objectForKey:@"NSFieldEditor"];
        [textField complete:self];
    }
}

answered Nov 10 '15 at 15:04

Aderstedt

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how to tell, if backspace was pressed? I can store my own most recent value, but can't distinguish from pasting a value. – Klaas Dec 18 '17 at 11:25

How to handle backspace in NSComboBox with swift 5

1 Answers1