How to know which is the class that sends the signal in qt ?

sliver_twist

My question is about how to know which is the class that sends the signal because what i want to do is specified to the class that has sent the signal
is it possible to do that ?
this is a prototype of what i intend to do

@ if (signal comes from class 1)
{do specified actions }
else if (comes from class 2)
{do something else } @

thanks

qxoz

Hi!
Look at this "thread":http://qt-project.org/forums/viewthread/12877

raven-worx

Check "this":http://qt-project.org/doc/qt-4.8/qobject.html#sender.
This only works if you use Qt::DirectConnection and your application is not "threaded".

@
slot() {
qDebug() << sender()->metaObject()->className();
}
@

SGaist

Hi,

It is, you can use "QObject::sender()":http://qt-project.org/doc/qt-4.8/qobject.html#sender coupled with "qobject_cast":http://qt-project.org/doc/qt-4.8/qobject.html#qobject_cast

But are you sure it's the right design ?

sliver_twist

how to translate this and use qt signal mapper with it ???

@ connect( ui->welcome, SIGNAL(changeStackedWidgetIndex(int)),
ui->stackedWidget, SLOT(setCurrentIndex(int)) );
connect( ui->credentials, SIGNAL(changeStackedWidgetIndex(int)),
ui->stackedWidget, SLOT(setCurrentIndex(int)) );
connect( ui->config, SIGNAL(changeStackedWidgetIndex(int)),
ui->stackedWidget, SLOT(setCurrentIndex(int)) );
connect( ui->syncwindow, SIGNAL(changeStackedWidgetIndex(int)),
ui->stackedWidget, SLOT(setCurrentIndex(int)) );
connect( ui->loaduser, SIGNAL(changeStackedWidgetIndex(int)),
ui->stackedWidget, SLOT(setCurrentIndex(int)) );@

SGaist

When is changeStackedWidgetIndex emitted ?
What are you trying to achieve ?

JulienMaille

If you really need to do different things depending on the sender, why don't you create 5 different slots?

@connect( ui->welcome, SIGNAL(changeStackedWidgetIndex(int)),
this, SLOT(setWelcomeIndex(int)) );
connect( ui->credentials, SIGNAL(changeStackedWidgetIndex(int)),
this, SLOT(setCredentialsIndex(int)) );
connect( ui->config, SIGNAL(changeStackedWidgetIndex(int)),
this, SLOT(setConfigIndex(int)) );
connect( ui->syncwindow, SIGNAL(changeStackedWidgetIndex(int)),
this, SLOT(setSyncwindowIndex(int)) );
connect( ui->loaduser, SIGNAL(changeStackedWidgetIndex(int)),
this, SLOT(setLoaduserIndex(int)) );

void YourClass::setWelcomeIndex(int idx)
{
someCodeSpecificToWelcome(idx);
commonSetIndex(idx);
}

void YourClass::setCredentialsIndex(int idx)
{
someCodeSpecificToCredential(idx);
commonSetIndex(idx);
}

void YourClass::commonSetIndex(int idx)
{
someCodeCommonToEveryone(idx);
ui->stackedWidget->setCurrentIndex(idx);
}@