QMathGL in a QScrollArea: resizing crashes

[SImon]

Hi there,

I have a Qt test program with a main window with a QScrollArea, with a QMathGL
widget (graph) as child.

The program crashes (exits) if i try to resize the main window (no scollbars
appear).

If I set

graph->autoResize = true

, nothing crashes but graph just adopts its parent size and rescales. Still no
scrollbars.

Why does the program crash with resizing? What is the best approach?

Thank you!

[SImon]

By the way, it QMathGL does work with QSplitter as parent container

[SImon]

The crash is caused by a segmentation fault.

Not that that is very helpful ;)

[SImon]

Ok, narrowed it down to the calling of resize(int, int)

void QMathGL::resizeEvent(QResizeEvent *ev)
{
        if (autoResize && ev->size().width() > 0 && ev->size().height() > 0) {
            graph->SetSize(ev->size().width(), ev->size().height());
            update();
        } else {
            resize(graph->GetWidth(), graph->GetHeight()); // this causes the exit
        }
}

[SImon]

Ha, cool! Its causing an infinite loop of resizing! (Probably still caused by
the construction within the parent QScrollArea)

[SImon]

Still no luck with the scrollbars though. Seems that the parent QScrollArea
doesn't see the size of its child QMathGL.

[Nobody/Anonymous]

Checked it out: Looks like a result of working with QDesigner forms...

But why?

Anyway, I'll try to re-implement without using the form designer...

[Nobody/Anonymous]

Ok, not using QDesigner works great!!!

[Alexey Balakin]

Which version do you use? Because I was comment this call sometime ago (at
least in SVN version).

[SImon]

I use
Qt Creator 2.2.1
with
QMake version 2.01a
using
Qt version 4.7.4 in /usr/lib/x86_64-linux-gnu
on
Ubuntu.

[Alexey Balakin]

No, the question was -- do you try latest SVN version?

[SImon]

Oh, excuse me. Using Ubuntu package mathgl 1.11.2-2ubuntu1.