[Qt-interest] How do I get QScrollArea to let its widget expand?

[kent williams]

I actually was doing scrollArea->setWidget(widgetForScrolling); -- but
I left it out of my code in the post.

Actually what fixed it for me was to ignore the documentation for
QScrollArea where it says

"If a standard QWidget is used for the child widget, it may be
necessary to call QWidget::setMinimumSize() to ensure that the
contents of the widget are shown correctly within the scroll area."

If I call setMinimumSize() the Widget for the widgetForScrolling, it
stays the minimum size, and all the subwidgets get crammed in so you
can't see them.


On Thu, Feb 24, 2011 at 12:21 PM, Girish Ramakrishnan
<girish at forwardbias.in> wrote:
> Hi,
>
> On Thu, Feb 24, 2011 at 9:23 PM, kent williams
> <nkwmailinglists at gmail.com> wrote:
>> Every time I have to do this, I have to try a bunch of different
>> permutations to get it to work, and THEN what I end up doing doesn't
>> WORK in the next context in which I try to do the SAME THING, so now
>> I'm asking how do I get this to work properly?
>>
>> QScrollArea *scrollArea = new QScrollArea(parent);
>>
>> QWidget *widgetForScrolling = new QWidget(scrollArea);
>>
>
> This only makes widgetForScrolling a child of the scrollArea. A
> QScrollArea does not show scrollbars based on it's children's
> geometry, but based on the widget you set using
> QScrollArea::setWidget(). So, what's missing is:
>
> scrollArea->setWidget(widgetForScrolling);
>
> The above call actually reparent the widgetForScrolling into
> QScrollArea's internal viewport widget. So, passing the parent
> argument can mislead you into thinking scrollArea is the parent of
> widgetForScrolling.
>
> Girish
>