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

[sliverTwist]

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 }

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

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Thanks

[Santosh Reddy]

To answer yor question yes, use QObject::sender() and then cast it in to whatever class you want.

But basing the logic on the sending object is not considered as a good design, so try not to base your logic on the sender.

May be you could use QSignalMapper instead and base your logic on the formal slot parameter.

[sliverTwist]

i know the method QSignalMapper but don't konw how to use it with this code

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)) );

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)) );

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[wysota]

Why would you want to use it with this code?

[Santosh Reddy]

QSignalMapper * signalMapper = QSignalMapper(this);
 
connect(ui->welcome, SIGNAL(changeStackedWidgetIndex()),     signalMapper, SLOT(map()) );
signalMapper->setMapping(ui->welcome, 0);
 
connect(ui->credentials, SIGNAL(changeStackedWidgetIndex()), signalMapper, SLOT(map()) );
signalMapper->setMapping(ui->credentials, 1);
 
connect(ui->config, SIGNAL(changeStackedWidgetIndex()),      signalMapper, SLOT(map()) );
signalMapper->setMapping(ui->config, 2);
 
connect(ui->syncwindow, SIGNAL(changeStackedWidgetIndex()),  signalMapper, SLOT(map()) );
signalMapper->setMapping(ui->syncwindow, 3);
 
connect(ui->loaduser, SIGNAL(changeStackedWidgetIndex()),    signalMapper, SLOT(map()) );
signalMapper->setMapping(ui->loaduser, 4);
 
connect(signalMapper, SIGNAL(mapped(int)), this, SIGNAL(setCurrentIndex(int)));

QSignalMapper * signalMapper = QSignalMapper(this);

connect(ui->welcome, SIGNAL(changeStackedWidgetIndex()),     signalMapper, SLOT(map()) );
signalMapper->setMapping(ui->welcome, 0);

connect(ui->credentials, SIGNAL(changeStackedWidgetIndex()), signalMapper, SLOT(map()) );
signalMapper->setMapping(ui->credentials, 1);

connect(ui->config, SIGNAL(changeStackedWidgetIndex()),      signalMapper, SLOT(map()) );
signalMapper->setMapping(ui->config, 2);

connect(ui->syncwindow, SIGNAL(changeStackedWidgetIndex()),  signalMapper, SLOT(map()) );
signalMapper->setMapping(ui->syncwindow, 3);

connect(ui->loaduser, SIGNAL(changeStackedWidgetIndex()),    signalMapper, SLOT(map()) );
signalMapper->setMapping(ui->loaduser, 4);

connect(signalMapper, SIGNAL(mapped(int)), this, SIGNAL(setCurrentIndex(int)));

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