how to modify contents of QScrollArea?

[cyrfer]

Hi,
I'd like to make a 'quiz' and I assumed I should add the long list of questions and radiobutton answers into a QScrollArea so they could all be seeen by the user. I'm having trouble to populate the scrollarea procedurally. In the Designer, I've been able to add mock-up questions to the scrollarea, but I can't even remove these mock-ups using my C++ code. I assume that if I can delete these children, I will know how to add content too.

I tried iterating over the "children of the scrollbar's widget's layout" (it hurts a little to say that). Here is my code to do that, which has a bad side-effect; the children render in a different place instead of just being deleted. I'd like to know the right way to delete the content of a scrollarea, thanks for any tips!

QWidget* scrollarea_content = ui->_quiz_scrollarea->widget();
if( scrollarea_content )
{
    //what is this?  scrollarea_content->children();
 
    QLayout* scrollarea_layout = scrollarea_content->layout();
 
    if( scrollarea_layout )
    {
       QLayoutItem *child;
       while ((child = scrollarea_layout->takeAt(0)) != 0)
       {
           delete child;
       }
    }
}

QWidget* scrollarea_content = ui->_quiz_scrollarea->widget();
if( scrollarea_content )
{
    //what is this?  scrollarea_content->children();

    QLayout* scrollarea_layout = scrollarea_content->layout();

    if( scrollarea_layout )
    {
       QLayoutItem *child;
       while ((child = scrollarea_layout->takeAt(0)) != 0)
       {
           delete child;
       }
    }
}

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[mattc]

I believe the problem is that you are not resetting the widget parent (i.e. you are removing it from the layout, but it is still a child of the scroll area)

Try something like this:

QLayoutItem *child;
 
while ((child = scrollarea_layout->takeAt(0)) != 0)
{
    child->widget()->setParent(0);
    delete child;
}

QLayoutItem *child;

while ((child = scrollarea_layout->takeAt(0)) != 0)
{
    child->widget()->setParent(0);
    delete child;
}

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(I am sorry I cannot test the code at the moment)