FramelessWindowHint freezes form with QAxWidget

[Tikitko]

An interesting problem when installing FramelessWindowHint flag all the content in the form as it is frozen, those buttons does not change when you hover style (: hover), and you can not edit the text field and more. All this happens when the form has QAxWidget. What could it be?
Win10 x32-x64
Qt 5.6 - 5.7

[mrjj]

Hi
That sounds odd.
Have you tried to create the QAxWidget later ?
Like via button.
After window is up and running etc.
Im wondering if QAxWidget get truma if put in
UI and then u set FramelessWindowHint in code.

[Tikitko]

I do everything on pure paper for the test...
i create 2 example photo:
no initialized qAxWidget
initialized qAxWidget

[mrjj]

@Tikitko
Ok, but in both cases, its included in the UI from start?
It seems once active it dont like FramelessWindowHint

I would look in
https://bugreports.qt.io/secure/Dashboard.jspa

and also test if you insert from code only
not having it in UI .

[Tikitko]

@mrjj
I tried so

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    this->setWindowFlags(Qt::FramelessWindowHint);
}

like this

void MainWindow::on_pushButton_clicked()
{
    this->setWindowFlags(Qt::FramelessWindowHint);
    this->show();
}

and

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.setWindowFlags(Qt::FramelessWindowHint);
    w.show();
    qDebug() << w.windowFlags();

    return a.exec();
}

[mrjj]

@Tikitko said:

setWindowFlags(Qt::FramelessWindowHint);

ok, but the flag is not the issue. that works.

I was thinking about
void MainWindow::on_pushButton_clicked()
{
QAxWidget *Test = new QAxWidget(this);
Test->Show();
.. other setup

and not have it in UI.
just to test.

[Tikitko]

@mrjj hmm
i do this:

void MainWindow::on_pushButton_clicked()
{
    QAxWidget *Test = new QAxWidget(this);
    Test->setControl("{8856f961-340a-11d0-a96b-00c04fd705a2}");
    Test->dynamicCall("Navigate(const  QString&)","http://vk.com/");
    Test->show();
}

And work! this bug work when i create QAxWidget in Disigner...

---

Hmm when i creat not in on_pushButton_clicked also this bug...

[mrjj]

well my "theory" is that
if QAxWidget is assigned to a parent before FramelessWindowHint
then bug comes.

[Tikitko]

@mrjj Then the solution is not to create QAxWidget in the constructor?

[mrjj]

Well I assume u tested that ?
Create it after setupUI and FramelessWindowHint does not make it work ?

If no, you can try with the showEvent
void maiwinxx::showEvent( QShowEvent* event ) {
QMainwindxx::showEvent( event );

// create it here.

}

[Tikitko]

@mrjj i create:

void MainWindow::showEvent( QShowEvent* event ) {

    QAxWidget *Test = new QAxWidget(this);
    Test->setControl("{8856f961-340a-11d0-a96b-00c04fd705a2}");
    Test->dynamicCall("Navigate(const  QString&)","http://vk.com/");
    Test->show();

}

Not help...
Excuse me, I find it hard to understand you, because I'm Russian ...

[mrjj]

@Tikitko
Hi, np. That was what i wanted to test.

So if we create it before windows is fully shown we get bug?

But if you create in button_click , it works?

[Tikitko]

@mrjj Yes, once checked, it is so ...

[mrjj]

@Tikitko
very strange!
I though showEvent would been same as clicked.
Try timer so that we first create after window fully shown.

// in constructor
QTimer *timer = new QTimer(this);
connect(timer, SIGNAL(timeout()), this, SLOT(nowcreate()));
timer->start(4000);
}

void MainWindow::nowcreate() << add this to .h also
{
qDebug() << "nowcreate";
// create here
QAxWidget *Test = new QAxWidget(this);
..
}

[Tikitko]

@mrjj This work!

[mrjj]

@Tikitko
ok
so window must be fully shown to make it happy.
Good testing :)

[Tikitko]

@mrjj Thank you very much for your help! So show window, and then create a widget ... So still the question, it is a bug Qt or something else? The problem can be considered solved only in the bug tracker you need to add ...

[mrjj]

@Tikitko
You are most welcome.
well I think its a bug but not sure.
When bug comes, it seems to me it hangs. That seems like bug.

Oh I forgot to ask.
What is {8856f961-340a-11d0-a96b-00c04fd705a2} ?

[Tikitko]

@mrjj this is Internet Explorer but in any case, the error with any object in QAxWidget...

[Tikitko]

@mrjj Hello, another mament noticed everything was decided widget loading after displaying the window, but if you minimize the window and deploy the freeze button again ...