[Qt-interest] Adding a QSpacerItem makes other widgets disapper...

[Tony Rietwyk]

Kustaa, 

Do your custom widgets (InputPane, etc) return a valid size hint?  

It may also help to set the sizing policies, min sizes, etc.  

Use QLayout.count and .itemAt to get the layout items - not
QObject.children.  

Tony.


> -----Original Message-----

snip

> MyView is derived from QWidget, and so are CalibrationPane, 
> OutputPane and
> InputPane. Each of them also has a .ui form.
> 
> The above code works I get eg three panes nicely laid out 
> vertically thanks
> to 'new  QBoxLayout(QBoxLayout::TopToBottom, this)' in the MyView
> constructor.
> 
> However, as soon as I uncomment the last line, the all the 
> widgets that re
> created int the while loop disappear. But I I add for example 
> QPushButton's
> before and/or after the 'addItem(new QSpacerItem' those are displayed
> correctly.
> 
> So my thinking is that this is some sort of 
> layout/hint/constraint issue but
> I'm at lost on how to debug this.
> 
> I tried to display the widget as follows:
> 
>      QObject* t;
>      QObjectList list = layout()->children();
>      foreach (t , list) {
>          QLayoutItem* item=reinterpret_cast<QLayoutItem*>(t);
>          qDebug() << "***" << item->geometry();
>      }
> 
> But the list seems to be empty, regardless if the widgets are
> displayed correctly or not.
> 
> br Kusti