How to display Widgets in the midle of a Window

[revellix]

Following problem:

I want to display a widget in the middle of a QMdiSubWindow. I also want to use Tabs later. Therefore I add a QStackWidget to a QMdiSubWindow. The first QStackWidget is a Widget I constructed called inAOrifice. Now in the Fullscreenmode the inAOrifice Widget isnt that big and I want to display it in the middle of the QMdiSubWindow, in the QStackWidget respectively. It always appears in the left upper corner. Any suggestions? I have tried a lot already. Cant see my mistake…

Most common code yet …

MainChild::MainChild(QWidget *parent) : QMdiSubWindow(parent)
{
    this->setAttribute(Qt::WA_DeleteOnClose);
 
    inAOrifice = new inputAOrifice(this);
    stackLayout = new QVBoxLayout(this);
    stackWidget = new QStackedWidget;
 
    stackWidget->addWidget(inAOrifice);
    stackLayout->setAlignment(stackWidget,Qt::AlignCenter);
    this->setWidget(stackWidget);
 
}

MainChild::MainChild(QWidget *parent) : QMdiSubWindow(parent)
{
    this->setAttribute(Qt::WA_DeleteOnClose);

    inAOrifice = new inputAOrifice(this);
    stackLayout = new QVBoxLayout(this);
    stackWidget = new QStackedWidget;

    stackWidget->addWidget(inAOrifice);
    stackLayout->setAlignment(stackWidget,Qt::AlignCenter);
    this->setWidget(stackWidget);

}

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[mvuori]

One bug that I see is that you don't seem to add any items in your layout, so centering it does not help. You probably need to add your "orifice" into it.

[Santosh Reddy]

For you custom widget to be centered, you need to create an empty QWidget, set a layout on to the empty widget, add custom widget on to the layout, and set center alignment to the custom widget, something like this.

QWidget * widget = new QWidget;
QGridLayout * layout = new QGridLayout(widget);
QWidget * inAOrifice = new inputAOrifice(widget);
layout->addWidget(inAOrifice);
layout->setAlignment(inAOrifice, Qt::AlignCenter);
// now add widget to the stacked widget

QWidget * widget = new QWidget;
QGridLayout * layout = new QGridLayout(widget);
QWidget * inAOrifice = new inputAOrifice(widget);
layout->addWidget(inAOrifice);
layout->setAlignment(inAOrifice, Qt::AlignCenter);
// now add widget to the stacked widget

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[revellix]

Santosh Reddy... very big thanks!!!!