[Qt-interest] What widget was clicked?

[Andre Somers]

On 23-4-2010 8:59, Eckhard Jokisch wrote:
> Nikos Chantziaras schrieb:
>    
>> On 04/22/2010 09:55 PM, Keiver Hdez Fdez wrote:
>>
>>      
>>> Hello folks, I have some widget added dynamically, like this:
>>>
>>> QWidget * uno = new QWidget(parent);
>>> uno->setStyleSheet("background: yellow");
>>> QWidget * dos = new QWidget(parent);
>>> dos->setStyleSheet("background: blue");
>>> QWidget * tres = new QWidget(parent);
>>> tres->setStyleSheet("background: white");
>>>
>>> ui->horizontalLayout->addWidget(uno);
>>> ui->horizontalLayout->addWidget(dos);
>>> ui->horizontalLayout->addWidget(tres);
>>>
>>> How do I know what was the widget the user clicked?
>>>
>>>        
>> By using a QWidget subclass that can tell you this.  Like a QPushButton,
>> or your own custom subclass that reimplements mousePressEvent() and/or
>> mouseReleaseEvent() and emits some kind of signal when a click is
>> detected.  You then catch that signal, just like you do if you use a
>> QPushButton.
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>>
>>      
> How do you connect the signals to slots?
> If you handcode this you could as well create different slots for every
> widget, set some value in this slot and call a slot that is shared by
> all widgets equally if needed.
>
> Or do I miss something?
>    
Or, as an alternative to the QSignalMapper solution Nikos already gave:

If you are working with your own subclassed widget anyway, you might as 
well add an identifier property that you can set on it (on construction 
and/or later on) and that get's emitted with the signal straight away. 
To do that, you can even just implement a private slot on the widget, 
connect it to the widget's own clicked() signal, and emit another signal 
from that slot that includes the identifier you set.

André