[Qt-interest] connect()ing multiple buttons to a receiver

[Malyushytsky, Alex]

>> but I still don't know of how to tell
*which* button it points to at that point.

sender() gives you a pointer to your button.

If this slot can be invoked only from clicking on QButton you could:

if ( sender() )
{
QButton* b = (QButton*) sender();
 .....

}

Regards,
    Alex


-----Original Message-----
From: qt-interest-bounces at trolltech.com [mailto:qt-interest-bounces at trolltech.com] On Behalf Of Paul England
Sent: Tuesday, January 06, 2009 9:36 PM
Cc: qt-interest at trolltech.com
Subject: Re: [Qt-interest] connect()ing multiple buttons to a receiver

Hi

I know about QObject::sender(), but I still don't know of how to tell
*which* button it points to at that point.  I'll check out
QSignalMapper.  I recall using this a while back (vaguely).

 >> QButtonGroup

Doesn't this require the buttons to be in a group?  Like in a box?
That's not going to work in this case, unfortunately.

Cheers
Paul


Kaleb Pederson wrote:
> On Tue, Jan 6, 2009 at 8:55 PM, Paul England <pengland at cmt-asia.com> wrote:
>
>> To put this simply:
>>
>> I will have a few buttons (4 or 5) that I want to connect() to a single
>> receiver.
>> The receiver will behave slightly differently depending on what button
>> is pushed though (does the same thing on different data).
>>
>> The buttons are stored in an array, and are made in a loop.  How many
>> depends on an
>> environment variable.  I can connect() them to the receiver just fine,
>> but as they are in
>> an array, the receiver doesn't know which one was pushed.
>>
>
> Take a look at QSignalMapper.  I believe the example is almost exactly
> what you're discussing above.
>
> Also, take a look at QObject::sender().
>
>
>>  From what I remember, reimplementing event handlers is a nono.
>>
>
> Re-implementing event handlers is fine, under the appropriate
> conditions.  In this case, it's quite unnecessary.
>
> HTH,
>
> --Kaleb
>
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