Connecting from a dialog to mainWindow

[anda_skoa]

You can forward the signal from the Dialog's line edit

class Dialog : public QDialog
{
    Q_OBJECT
public:
    explicit Dialog(QWidget *parent = 0);
 
signals:
    void textChanged(const QString &text);
};

class Dialog : public QDialog
{
    Q_OBJECT
public:
    explicit Dialog(QWidget *parent = 0);

signals:
    void textChanged(const QString &text);
};

To copy to clipboard, switch view to plain text mode 

Dialog::Dialog(QWidget *parent)
    : QDialog(parent)
    , ui(....)
{
    connect(ui->lineEdit, SIGNAL(textChanged(QString)), this, SIGNAL(textChanged(QString)));
}

Dialog::Dialog(QWidget *parent)
    : QDialog(parent)
    , ui(....)
{
    connect(ui->lineEdit, SIGNAL(textChanged(QString)), this, SIGNAL(textChanged(QString)));
}

To copy to clipboard, switch view to plain text mode 

And then connect that signal in your main window to whatever slot you want.

Cheers,
_

[toufic.dbouk]

Is there any advantage behind forwarding the signal to another signal

connect(ui->lineEdit, SIGNAL(textChanged(QString)), this, SIGNAL(textChanged(QString)));

connect(ui->lineEdit, SIGNAL(textChanged(QString)), this, SIGNAL(textChanged(QString)));

To copy to clipboard, switch view to plain text mode 

over just emitting a new signal such as ?

emit sendText(ui->lineEdit->text());

emit sendText(ui->lineEdit->text());

To copy to clipboard, switch view to plain text mode 

[anda_skoa]

Is there any advantage behind forwarding the signal to another signal

connect(ui->lineEdit, SIGNAL(textChanged(QString)), this, SIGNAL(textChanged(QString)));

connect(ui->lineEdit, SIGNAL(textChanged(QString)), this, SIGNAL(textChanged(QString)));

To copy to clipboard, switch view to plain text mode 

over just emitting a new signal such as ?

emit sendText(ui->lineEdit->text());

emit sendText(ui->lineEdit->text());

To copy to clipboard, switch view to plain text mode 

It depends on what the goal is.

Given the thread starter's question it looks like the goal is a synchronisation between two line edits.
For that goal the forwarding is "nicer" because you don't need a slot just to emit a signal again and the signal/signal connect makes the forwarding very obvious when reading the code.

In the example you gave, i.e. reacting to a button, the slot plus explicit emit is the only possible choice.

Cheers,
_

[toufic.dbouk]

Alright got it anda_skoa.
Thanks for the explanation.

[myta212]

Hi,
Your problem is like this thread http://www.qtcentre.org/threads/5647...ng-error/page2
I have created a sample code from above link (signal and slot using QmainWindow and QDialog).
You can check that and I hope get idea how to solve your problem.

Best regards,

Toto

[toufic.dbouk]

Hello, if you are addressing me , i dont have a problem.
My question was if there is any advantages of one way over the other.
Good Luck.