Re: selectText of NSTextField on focus
Re: selectText of NSTextField on focus
- Subject: Re: selectText of NSTextField on focus
- From: Mike Abdullah <email@hidden>
- Date: Mon, 06 Jul 2015 21:03:21 +0100
> On 6 Jul 2015, at 20:38, Richard Charles <email@hidden> wrote:
>
>> On Jul 6, 2015, at 12:12 PM, Gary L. Wade wrote:
>>
>> You want to select the text using the associated text view of the NSTextField control.
>
> Not sure what you mean by the "associated text view" of the control. Do you mean the field editor of the control? I have subclassed NSTextField and overridden becomeFirstResponder. NSTextField is a subclass of NSControl which is a subclass of NSView.
>
>
>> On Jul 6, 2015, at 12:07 PM, Quincey Morris wrote:
>>
>> On Jul 6, 2015, at 10:54 , Richard Charles wrote:
>>
>>> [self performSelector:@selector(selectText:) withObject:self afterDelay:0];
>>
>> I dunno, but I suspect that this isn’t good enough. You’re merely guessing that “on the next iteration of the run loop” is *after* the text field finished becoming first responder, but it may take time to get the text field into a state where its selection can be set.
>
> Yes I think that is the case. The following code works.
>
> [self performSelector:@selector(selectText:) withObject:self afterDelay:0.1];
>
>
>> I’d suggest you try selecting the text in a delegate method (textDidBeginEditing or controlTextDidBeginEditing) instead.
>
> The delegate methods textDidBeginEditing: and controlTextDidBeginEditing: are not called when clicking into the view. They are called when the first edit is actually attempted. So that did not work.
>
>
> In fiddling around with afterDelay: values this is what I found.
>
> afterDelay:0.01 // This did not work. Text not selected.
>
> afterDelay:0.02 // This works. Text is selected.
>
> afterDelay:0.1 // This works. Text is selected.
>
> afterDelay:1.0 // This works but the delay is too long.
>
> So do you think I am safe using this call.
>
> [self performSelector:@selector(selectText:) withObject:self afterDelay:0.1];
No.
Almost any time you have a delayed perform in your code, you’re doing something a bit dubious, and you’ve just wandered into proper dodgy territory, where your code is guaranteed to be unreliable.
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