Open subwindow from parent window ctor

[olidem]

Hmm, I think I didn't explain prcisely enough what I mean.

After your first replies, my (working) code looks as follows:

class EditCustomerImageDialog : public QDialog
{
	Q_OBJECT
 
public:
	EditCustomerImageDialog(Customer * c, QWidget * parent = 0, Qt::WindowFlags f = 0)
	: QDialog(parent, f)
	{
		//...
		openFile();
	}
public slots:
	void openFile()
	{
		QString filename = QFileDialog::getOpenFileName(
				NULL, tr("Open face image"), "",
				tr("Image Files (*.jpg)"));
		//...
	}
}

class EditCustomerImageDialog : public QDialog
{
	Q_OBJECT

public:
	EditCustomerImageDialog(Customer * c, QWidget * parent = 0, Qt::WindowFlags f = 0)
	: QDialog(parent, f)
	{
		//...
		openFile();
	}
public slots:
	void openFile()
	{
		QString filename = QFileDialog::getOpenFileName(
				NULL, tr("Open face image"), "",
				tr("Image Files (*.jpg)"));
		//...
	}
}

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If I now open such a dialog from somewhere via

EditCustomerImageDialog d (new Customer);
d.exec();

EditCustomerImageDialog d (new Customer);
d.exec();

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what happens is that *first*, the openFileName Dialog pops up, nothing else.

*After* having chosen a file, and after the openfilediag has disappeared, then the EditCustomerDialog pops up.

Question:
Can I realise that the EditCustomerDialog pops up, and directly after that, the open FIle diag should pop up ???

[spirit]

did you try something like this?
main.cpp

...
int main(int argc, char **argv)
{
QApplication app(argc, argv);
EditCustomerImageDialog ecid;
ecid.show();
const QString fileName(QFileDialog::getOpenFileName(
                NULL, tr("Open face image"), "",
                tr("Image Files (*.jpg)")));
ecid.openFile(fileName);
return app.exec();
}

...
int main(int argc, char **argv)
{
QApplication app(argc, argv);
EditCustomerImageDialog ecid;
ecid.show();
const QString fileName(QFileDialog::getOpenFileName(
                NULL, tr("Open face image"), "",
                tr("Image Files (*.jpg)")));
ecid.openFile(fileName);
return app.exec();
}

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EditCustomerImageDialog.cpp

class EditCustomerImageDialog : public QDialog
{
    Q_OBJECT
 
public:
    EditCustomerImageDialog(Customer * c, QWidget * parent = 0, Qt::WindowFlags f = 0)
    : QDialog(parent, f)
    {
        //...
        //openFile();
    }
public slots:
    void openFile(const QString &fileName = QString())
    {
        QString tmpFileName = fileName;
        if (tmpFileName.isEmpty())
                tmpFileName = QFileDialog::getOpenFileName(
                                NULL, tr("Open face image"), "",
                                tr("Image Files (*.jpg)"));
        //...
    }
}

class EditCustomerImageDialog : public QDialog
{
    Q_OBJECT
 
public:
    EditCustomerImageDialog(Customer * c, QWidget * parent = 0, Qt::WindowFlags f = 0)
    : QDialog(parent, f)
    {
        //...
        //openFile();
    }
public slots:
    void openFile(const QString &fileName = QString())
    {
        QString tmpFileName = fileName;
        if (tmpFileName.isEmpty())
                tmpFileName = QFileDialog::getOpenFileName(
                                NULL, tr("Open face image"), "",
                                tr("Image Files (*.jpg)"));
        //...
    }
}

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[olidem]

I know what you mean, but QDialog::show() returns immediately, while my ::exec() realisation blocks the caller. Ok, one can discuss for hours about this, it is a matter of taste, but I like the blocking thing more, also because this is just a modal dialog on top of my app, which is blocked while the dialog is shown.

Thanks again for your support, great people out here!

[spirit]

ok, another solution
cpp

Test::Test(QWidget *parent)
	: QDialog(parent)
{
	...
	QMetaObject::invokeMethod(this, "showDialog", Qt::QueuedConnection);
	...
}
 
void Test::showDialog()
{
	QFileDialog::getOpenFileName(this);
}

Test::Test(QWidget *parent)
	: QDialog(parent)
{
	...
	QMetaObject::invokeMethod(this, "showDialog", Qt::QueuedConnection);
	...
}

void Test::showDialog()
{
	QFileDialog::getOpenFileName(this);
}

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h

private slots:
	void showDialog();

private slots:
	void showDialog();

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[fifth]

For this situation is usually use a single shot timer, put something like

QTimer::singleShot(0, this, SLOT(openFile()));

QTimer::singleShot(0, this, SLOT(openFile()));

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at the end of your constructor for the main window. A time of zero will fire the slot after your window is visible.

ps Hopefully the above code is correct i don't do much (any?) C++ put I think you'll get the idea.

[spirit]

For this situation is usually use a single shot timer, put something like

QTimer::singleShot(0, this, SLOT(openFile()));

QTimer::singleShot(0, this, SLOT(openFile()));

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at the end of your constructor for the main window. A time of zero will fire the slot after your window is visible.

ps Hopefully the above code is correct i don't do much (any?) C++ put I think you'll get the idea.

your code has the same behavior as my, because

The default value for this property is 0. A QTimer with a timeout interval of 0 will time out as soon as all the events in the window system's event queue have been processed.

but I don't use a timer.

[fifth]

but I don't use a timer.

You win I didn't know about QMetaObject but will probably use your method now. It is more obvious in the code what is happening.

For PyQt, just need to make sure you include the signature for the slot.

class MainWindow(QWidget):
    def __init__(self, parent = None):
        super(MainWindow, self).__init__(parent)
 
        QMetaObject.invokeMethod(self, "showDialog", Qt.QueuedConnection);
 
    @pyqtSignature("showDialog()")
    def showDialog(self):
        QFileDialog.getOpenFileName(self)

class MainWindow(QWidget):
    def __init__(self, parent = None):
        super(MainWindow, self).__init__(parent)
        
        QMetaObject.invokeMethod(self, "showDialog", Qt.QueuedConnection);
    
    @pyqtSignature("showDialog()")
    def showDialog(self):
        QFileDialog.getOpenFileName(self)

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