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Qt-interest Archive, October 2007
Signals and slots

Message 1 in thread

Hi,
Just a simple question. I wanted to do this:

    connect ( surfEdgeColorBt, SIGNAL ( clicked() ),
              this, SLOT ( setColor(FOREGROUNDCOLOR,SURFMESHVIEW) );

with EDGECOLOR, SURFMESHVIEW  being defined as  constants.

But I get a error message saying :
Object::connect: No such slot 
CSBDMainWindow::setColor(FOREGROUNDCOLOR,SURFMESHVIEW)


 even though I have a function  declared as a slot void setColor(int 
value1, int value2);

Is there a way to connect my signal to this function with arguments 
directly?

Thanks,
Marie

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Message 2 in thread

>
> Is there a way to connect my signal to this function with arguments 
> directly?
>
>
No, args in SLOT func must match or less than args in SIGNAL func.

Lingfa

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Message 3 in thread

With a minor change you can make this work...

In the classes definition of the method set color

Change setColor( int, int ) to setColor( int value1=FOREGROUNDCOLOR, int
value2=SURFMESHVIEW )

And then in your connect, call SLOT( setColor( int, int ) )

Works like a charm

Another method, have 2 slots, one with parameters one without, and have
the one without call the one with default parameters.. But I find that
very un-C++

Scott

> -----Original Message-----
> From: Marie-Christine Vallet [mailto:mmvallet@xxxxxxxxxxx]
> Sent: Friday, October 19, 2007 1:40 PM
> To: qt-interest@xxxxxxxxxxxxx
> Subject: Signals and slots
> 
> Hi,
> Just a simple question. I wanted to do this:
> 
>     connect ( surfEdgeColorBt, SIGNAL ( clicked() ),
>               this, SLOT ( setColor(FOREGROUNDCOLOR,SURFMESHVIEW) );
> 
> with EDGECOLOR, SURFMESHVIEW  being defined as  constants.
> 
> But I get a error message saying :
> Object::connect: No such slot
> CSBDMainWindow::setColor(FOREGROUNDCOLOR,SURFMESHVIEW)
> 
> 
>  even though I have a function  declared as a slot void setColor(int
> value1, int value2);
> 
> Is there a way to connect my signal to this function with arguments
> directly?
> 
> Thanks,
> Marie
> 
> --
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> "unsubscribe" in the subject or the body.
> List archive and information: http://lists.trolltech.com/qt-interest/

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Message 4 in thread

Em Saturday 20 October 2007 00:06:26 Scott Aron Bloom escreveu:
> Change setColor( int, int ) to setColor( int value1=FOREGROUNDCOLOR, int
> value2=SURFMESHVIEW )
>
> And then in your connect, call SLOT( setColor( int, int ) )

You have to name it SLOT(setColor()) so that the default parameters apply.

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Message 5 in thread

> Em Saturday 20 October 2007 00:06:26 Scott Aron Bloom escreveu:
> > Change setColor( int, int ) to setColor( int value1=FOREGROUNDCOLOR,
int
> > value2=SURFMESHVIEW )
> >
> > And then in your connect, call SLOT( setColor( int, int ) )
> 
> You have to name it SLOT(setColor()) so that the default parameters
apply.

Ill defer to your recommendation, but I have never done that... And when
I have, I get the warning "no slot exists" since the definition of the
slot has the int,int parameters....

Scott

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Message 6 in thread

Em Monday 22 October 2007 16:44:49 Scott Aron Bloom escreveu:
> > Em Saturday 20 October 2007 00:06:26 Scott Aron Bloom escreveu:
> > > Change setColor( int, int ) to setColor( int value1=FOREGROUNDCOLOR,
>
> int
>
> > > value2=SURFMESHVIEW )
> > >
> > > And then in your connect, call SLOT( setColor( int, int ) )
> >
> > You have to name it SLOT(setColor()) so that the default parameters
>
> apply.
>
> Ill defer to your recommendation, but I have never done that... And when
> I have, I get the warning "no slot exists" since the definition of the
> slot has the int,int parameters....

If you declare the slot like this in your class:

public slots:
	void setColor(int foreground = -1, int background = -1);

the moc will generate three slots:
	void setColor()
	void setColor(int)
	void setColor(int, int)
	The former two have a special attribute "cloned" set on them, if you inspect 
via QMetaMethod.

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Message 7 in thread

> 	void setColor()
> 	void setColor(int)
> 	void setColor(int, int)
> 	The former two have a special attribute "cloned" set on them, if
you
> inspect
> via QMetaMethod.

Thanks for the info...  I guess its been a while since I have used that
and inspected it...

Scott

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