comboBox signal question?

i can't understand how to connect signal slots of comboBox.If it was just a pushButton everything is clear but comboBox consists of
different choices for example:

Cars
Bus
Truck

how to implement that different slot to be called if Cars is selected and different if Bus....?

Maeby you don't need to... What if you connect QComboBox class signal currentIndexChanged ( const QString & text ) to slot where you use switch:

Code:

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connect(combo,SIGNAL(QString &),this,SLOT(makesomething(QString &)));
 
void myClass::makesomething(QString selection){
switch(selection){
 
case...
 
}
}

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There is no such distinction since you don't need to:).

You could emit a custom signal inside your "activated" signals slot in order to handle if the pressed item is a Bus.

What i do is:

connect(ui->comboBox, SIGNAL(currentIndexChanged()), this, SLOT(combochanged()));

void Rechnik::combochanged(int index)
{
switch (index) {
case 0:
select_dictionary1();
break;
case 1:
select_dictionary2();
break;
case 2:
select_dictionary3();
break;
}

it compiles without errors but nothing happens when i changed comboBox

Check the output window - there will be an error there for you.

Also, check the documentation - currentIndexChanged() doesn't exist. It's currentIndexChanged(int)

When i put some integer inside it underline it as error.
I suppose that inside must be the number of the selected item from comboBox i mean 0 for first, 1 for next etc.

Maybe you misunderstand, what I mean is this:

Code:

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connect(ui->comboBox, SIGNAL(currentIndexChanged(int)), this, SLOT(combochanged(int)));

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it works, thanks a lot!!!!