[Qt-interest] How to put a QLayout in a QScrollArea ?

[Constantin Makshin]

There's no magic. QScrollArea needs and uses its own layout for scroll  
bar[s]. Also documentation clearly describes QScrollArea'ss purpose and  
the way its contents must be specified: "A scroll area is used to display  
the contents of a child widget within a frame. ... The child widget must  
be specified with setWidget()."

On Tue, 15 Dec 2009 17:02:40 +0300, Stephen Collyer  
<scollyer at netspinner.co.uk> wrote:
> 2009/12/14 Eric Clark <eclark at ara.com>
>> QWidget’s do not have layouts by default, but some subclasses, like
>> QScrollArea, I believe, already does
> That sounds odd. Why should an empty QScrollArea have a layout ?
>
> Anyway, I've modified my original code based on your suggestion thus:
>
> QuestionSelectorList::QuestionSelectorList(const QList<QuestionSelector  
> *>
> qsels,
>                                            QWidget* parent)
>                        : QScrollArea(parent)
> {
>     QWidget* widget = new QWidget(this);
>     vbox_  = new QVBoxLayout(this);
>
>     foreach (QuestionSelector* qsel, qsels)
>     {
>         vbox_->addWidget(qsel);
>     }
>
>     widget->setLayout(vbox_);
>     setWidget(widget);
> }
>
> and this works fine. Thanks.
>
> Would it be sacreligious of me to suggest that the Qt layout system is  
> full of black magic and hidden secrets ?

-- 
Constantin Makshin