Re: Touch panel keyboard in GNUstep app

[Wolfgang Lux]

> 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;
    }