[Qt-interest] Nested widget disappears when I add a spacer item / dynamically adding widgets to widgets

[Tony Rietwyk]

Kustaa, 

I sent a response to the list and received it... 

And I think the answer is the same in this case as well !

Tony.


> -----Original Message-----
> Related to my unanswered question yesterday here is a more specific
> test case:
> 
> I've got following simple code:
> 
>     gLayout = new QBoxLayout(QBoxLayout::TopToBottom, this);
> 
>     QWidget* top=new QWidget();
>     new QPushButton("A",top);
> 
>     gLayout->addWidget(top);
> 
>     gLayout->addWidget(new QPushButton("B"));
> 
> 
> This works, and displays two buttons, A and B.
> 
> But if I add a spacer to the mix by adding a single line:
> 
> gLayout->addItem(
>    new QSpacerItem(20, 40, QSizePolicy::Minimum, 
> QSizePolicy::Expanding));
> 
> then button A disappers!
> 
> What is going on?
> 
> Note that button A is a child of the widget 'top' which is what I add
> to the layout. If I add A button to gLayout directly then there is no
> problem but inmy bigger application that is not feasible 
> because 'top' is a
> form maintained with Qt Designer...
> 
> So what is the proper way to add a widget that contains widgets
> to a layout?
> 
> br Kusti