Re: Touch panel keyboard in GNUstep app

[Wolfgang Lux]

Sorry,

accidentally sent the email below before realizing that this code is skipped 
when you click on button.
But that really makes me wonder where the text view is told to resign first 
responder. :-(

Wolfgang

> Am 30.03.2020 um 17:02 schrieb Wolfgang Lux <wolfgang.lux@gmail.com>:
> 
> 
> 
>> Am 30.03.2020 um 15:19 schrieb Andreas Höschler <ahoesch@smartsoft.de>:
>> 
>> Hi Fred,
>> 
>>> in NSButton you find this code:
>>> 
>>> 
>>> - (BOOL) acceptsFirstMouse: (NSEvent *)theEvent
>>> {
>>> return YES;
>>> }
>>> 
>>> 
>>> You will need to write a subclass to handle this different.
>> 
>> Thanks a lot for your response. I created a subclass KbButton and overwrote 
>> this method like so
>> 
>> - (BOOL)acceptsFirstMouse:(NSEvent *)theEvent
>> {
>>  NSLog(@"%@ returns acceptsFirstMouse NO", self);
>>  return NO;
>> }
>> 
>> When I click on the button the currently active NSTextField looses first 
>> responder and the action of the button is called 
>> 
>> 30/03/20 14:42:16,912 ScaleMaster[59798]: strike sender <KbButton: 
>> 0x7b82ae50> stringValue A
>> 
>> The method acceptsFirstMouse: of KbButton is never called. So this 
>> unfortunately does not work, at least not on MacOSX (dev machine for the 
>> project). :-( I will port the code to GNUstep and see whether GNUstep 
>> behaves differently. Will let you know ...
> 
> Well, yes. I'm afraid Fred's advice is wrong (even though . While the code in 
> -[NSWindow sendEvent:] indeed requires  The method acceptsFirstMouse is 
> supposed to serve a different purpose. When you activate window by clicking 
> onto it, acceptsFirstMouse governs whether this click is passed to the 
> control under the mouse (acceptsFirstMouse returns YES) or whether it is only 
> for activating the window (acceptsFirstMouse returns NO). Your original 
> approach calling setAcceptsFirstResponder: with NO looks right to me. It is 
> just that the code in -[NSEvent sendEvent:] gets the logic wrong. Where it 
> currently says
>  if ([v acceptsFirstResponder] && ![self makeFirstResponder: v])
>    {
>      return;
>    }
> it should really say
>  if (![v acceptsFirstResponder] || ![self makeFirstResponder: v])
>    {
>      return;
>    }