Best way to add child windows

I've been trying QT4 for the past few days and i'm having problems understanding how the implement this in my application:

What i want to achieve:

1) Main window with buttons -OK
2) User press one of the buttons a Tab widget will appear -OK
3) Tab Widget have button -OK
4) User press button on tab widget and a new window must appear on top of the tab widget

The 4) never works for me, unless i use a QmessageBox, but i really need more "control" over the message window in question.


I created things like this:

//Create the tab widget

Stuff_tab::Stuff_tab(QWidget *parent) : QDialog(parent)
{

tabWidget = new QTabWidget;
tabWidget->addTab(new Tab1, tr("Tab 1"));
tabWidget->addTab(new Tab2, tr("Tab 2"));

.......

mainLayout = new QVBoxLayout;//(this);
mainLayout->setSizeConstraint( QLayout::SetFixedSize );
tabWidget->setFixedSize(400, 768);

mainLayout->addWidget(tabWidget);
setLayout(mainLayout);

setWindowTitle(tr("Tab"));
}




void Stuff_tab::infoMessage() //called from a button on the tab widget
{

QDialogButtonBox *buttonBox; // i also tried with different widget types
buttonBox = new QDialogButtonBox(QDialogButtonBox::Open
| QDialogButtonBox::Cancel
| QDialogButtonBox::Help);


QVBoxLayout *mainLayout2 = new QVBoxLayout( this );
mainLayout2->setSizeConstraint( QLayout::SetFixedSize );

buttonBox->setFixedSize(200, 200);
mainLayout2->addWidget(buttonBox);

setLayout(mainLayout2); // use this?
}
//this part never show up on screen


I can't have nested layouts? Am i doing things the wrong way? Any help will be really appreciated. Thanks in advance.

What exactly do you want to achieve? Have you tried calling show() on widgets which you add after the window is first shown?

Well, as a matter of fact i didn't called show(), which i just did now, the child widget now pops up but under the tab widget, and i only have control over it after i close the tab widget.

Does "under the tab widget" mean "behind the tab widget" or "lower than the tab widget" (in terms of geometry)?
Maybe you're just after a modal dialog? In that case wrap the new widget into a QDialog and use QDialog::exec() to pop up a modal dialog.

Quote:

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Originally Posted by wysota

Does "under the tab widget" mean "behind the tab widget" or "lower than the tab widget" (in terms of geometry)?

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Well, after i press the button on the tab widget, the new window shows up near top left of the screen (not centered with the tab widget) and i can't press on it, i only can after i close the tab widget.

Quote:

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Originally Posted by wysota

Maybe you're just after a modal dialog? In that case wrap the new widget into a QDialog and use QDialog::exec() to pop up a modal dialog.

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I understand it in theory, but after browsing through the Qdialog members i couldn't see which will be the correct member to cal for wrapping a widget into Qdialog?

Code:

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QDialog dlg;
QVBoxLayout *l = new QVBoxLayout(&dlg);
MyWidget *wgt = new MyWidget;
l->addWidget(wgt);
dlg.exec()

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