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Re: Touch panel keyboard in GNUstep app


From: Andreas Höschler
Subject: Re: Touch panel keyboard in GNUstep app
Date: Tue, 31 Mar 2020 11:30:53 +0000 (UTC)

Hi Fred,

in the meanwhile I was able to test the 

- (void)mouseDown:(NSEvent *)theEvent
{    
 NSLog(@"mouseDown ...");
 [NSApp preventWindowOrdering];        

 [self highlight:YES];

 NSEvent *mouseUpEvent = [[self window] nextEventMatchingMask:NSLeftMouseUpMask untilDate:[NSDate distantFuture] inMode:NSEventTrackingRunLoopMode dequeue:YES];
 NSPoint mouseLocation = [self convertPoint:[mouseUpEvent locationInWindow] fromView:nil];
 BOOL mouseUpInside = [self mouse:mouseLocation inRect:[self bounds]];

 if (mouseUpInside)
   {
    if ([self target]) [[self target] performSelector:[self action] withObject:self]; 
   }      
 [self highlight:NO];                  
}

code fragment (NSButton subclass) on GNUstep. And as expected it does not work there. So I am still looking for a solution ...

Do you know which part in the GNustep source tree resigns fist responder from a currently active control and transfers it to a clicked button? I got somehow lost in the event handling code. 

Thanks a lot,

   Andreas



The method preventWindowOrdering is a NOOP on GNUstep, so it won’t help you. Put if this is what helps you on MacOS then most likely your touch panel is stealing the focus. You should try to override canBecomeKeyWindow for that panel.

Hope this help,
Fred

Am 30.03.2020 um 19:13 schrieb Andreas Höschler <address@hidden>:


Am 30.03.2020 um 15:19 schrieb Andreas Höschler <address@hidden>:

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;
 }

I got this working on MacOSX by subclassing NSButton and doing

- (void)mouseDown:(NSEvent *)theEvent
{    
 NSLog(@"mouseDown ...");
 [NSApp preventWindowOrdering];        

 [self highlight:YES];

 NSEvent *mouseUpEvent = [[self window] nextEventMatchingMask:NSLeftMouseUpMask
 untilDate:[NSDate distantFuture] inMode:NSEventTrackingRunLoopMode dequeue:YES];
 NSPoint mouseLocation = [self convertPoint:[mouseUpEvent locationInWindow] fromView:nil];
 BOOL mouseUpInside = [self mouse:mouseLocation inRect:[self bounds]];

 if (mouseUpInside)
   {
    if ([self target])
    [[self target] performSelector:[self action] withObject:self];
   }      
 [self highlight:NO];                  
}

I haven't tested that on the GNUstep machine yet. But if it worked there as well this would make my day.

Best wishes,

Andrea




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