MdiSubwindows when minimized and restored don't have same position.

[MasterBLB]

Hey Qt Devs

I created 2 widgets, then put them into QMdiArea by QMdiArea::addSubwindow(QWidget *widget). The trick I wish to archive is to minimize 2nd subwindow when I'm minimizing the 1st one, and restore it as well. Do to that, I've written code:

void My1stWidget::changeEvent(QEvent *event)
{
    event->accept();
    QWidget::changeEvent(event);
    if (event->type() == QEvent::WindowStateChange && addEquipmentDialog)
    {
        if (isMinimized())
        {
            //emit minimizeAddNewEquipmentDialog();
            addEquipmentDialog->showMinimized();//that's 2nd widget
        }
        else
        {
            //emit restoreAddNewEquipmentDialog();
            addEquipmentDialog->showNormal();
        }
    }
}

Works fine, except the 1st widget is not restored to the same position on QMdiArea it had before minimizing. If I minimize the widgets separately they restore to correct positions.
What I'm doing wrong, or what knowledge I'm missing?

Qt 5.11.2, mingw32 compiler.

[SGaist]

Hi,

Since you call accept on the event, it will not be further processed when calling the base class implementation. so you should likely remove that line.

[MasterBLB]

Unfortunetly @SGaist it didn't helped :/
Well, more information. The 2nd widget(the one with red close buttons) at the beginning is a child of 1st widget

Then it is switched to independent window, and looks like this:

Code which does the switch:

void AddEquipmentItem::switchToFloatingMode(bool turnOn)
{
    if (turnOn)
    {
        if (!floatingWindow)
        {
            floatingWindow = area->addSubWindow(this);
            floatingWindow->setWindowFlags(Qt::Widget | Qt::WindowTitleHint | Qt::WindowMinimizeButtonHint | Qt::WindowStaysOnTopHint);
            floatingWindow->setWindowFlag(Qt::WindowSystemMenuHint, false);
            floatingWindow->setFixedWidth(this->width() + 8);
        }
        else
        {
            floatingWindow->setWidget(this);
        }
        floatingModeButton->setToolTip("Switch to docked mode");
        floatingModeButton->setIcon(dockedIcon);
        floatingWindow->show();
    }
    else
    {
        floatingWindow->setWidget(nullptr);
        floatingWindow->hide();

        setParent(parentWidget);//parent widget is the 1st widget

        floatingModeButton->setToolTip("Switch to floating mode");
        floatingModeButton->setIcon(floatingIcon);

        setGeometry(geometryRectangle);
        initAndShow(mechPart);
        move(anchorPoint);
    }
}

And the bug - after minimizing, then restoring the main widget its position should be like on the screen above - yet it isn't

[SGaist]

What's that geometryRectangle variable ?

[MasterBLB]

geometryRectangle is used to position 2nd widget when in docked mode - as you can see on 1st screen shot.

[SGaist]

I meant: where does it come from.

Looks like only the top is not aligned with your other widget's geometry.

[MasterBLB]

That geometryRectangle is irrelevant, as it is used only for the widget with 2 large, red close buttons which is positioned correctly. What I observed via debugging/logging is that code part:

        if (isMinimized())
        {
            //emit minimizeAddNewEquipmentDialog();
            addEquipmentDialog->showMinimized();//that's 2nd widget
        }

somehow spoils behavior of the widget, if I recall correctly after manual, separate minimizing call showNormal() simultaneously worked fine for both widgets. Need to confirm that after work, though.