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It's possible to bind more than one signal to one slot (isn't?). So, is there a way to understand which widget sends the signal? I'm looking for something like sender argument of events in .NET
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A signal is emitted when a particular event occurs. Qt's widgets have many predefined signals, but we can always subclass widgets to add our own signals to them. A slot is a function that is called in response to a particular signal.
You can connect as many signals as you want to a single slot, and a signal can be connected to as many slots as you need. It is even possible to connect a signal directly to another signal. (This will emit the second signal immediately whenever the first is emitted.)
Use QObject::sender() in the slot, like in the following Example:
void MainWindow::someSetupFunction( void ) { ... connect( _foobarButton, SIGNAL(clicked()), this, SLOT(buttonPressedSlot()) ); } void MainWindow::buttonPressedSlot() { // e.g. check with member variable _foobarButton QObject* obj = sender(); if( obj == _foobarButton ) { ... } // e.g. casting to the class you know its connected with QPushButton* button = qobject_cast<QPushButton*>(sender()); if( button != NULL ) { ... } } QObject::sender() will do the job.
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