How to put a layout over a fullscreen item?

[Violet Giraffe]

I want to have a set of buttons "floating" over a full-screen item at the bottom, overlapping it. Can this be done?

[raven-worx]

Edit: sorry, i have seen afterwards that you are looking for a QML solution.

@Violet-Giraffe
something like this is a possibility (untested):

class MyButtonPanel : public QFrame
{
public:
    MyButtonPanel( QWidget* fullScreenWidget )
        : QFrame( fullScreenWidget, Qt::Window )
    {
           fullScreenWidget->installEventFilter( this );
    }

    virtual bool eventFilter( Qobject* watched, QEvent* event )
    {
           switch( event->type() )
           {
                case QEvent::Resize:
                case QEvent::Move:
                      this->updatePosition();
                break;
           return QFrame::eventFilter( watched, event );
    }

protected slots:
      void updatePosition()
      {
             if( this->isHidden() )
                   return;

             QWidget* fullScreenWidget = this->parentWidget();
             QRect globalRect = fullScreenWidget->rect();
                  globalRect->moveTopLeft( fullScreenWidget->mapToGlobal( QPoint(0,0) );

             QRect geometry = this->geometry();
             geometry.moveBottomRight( globalRect.bottomRight() - QPoint(20,20) );
             this->setGeometry( geometry );
      }
};

[Violet Giraffe]

@raven-worx
Thanks, but I meant QML - this is the Qt Quick section, didn't think I need to specify :)

[raven-worx]

@Violet-Giraffe
yes, my fault.
I realized it after i made the post.

[Violet Giraffe]

I think anchors is the way to go. Works like charm:

import QtQuick 2.7
import QtQuick.Controls 2.0
import QtQuick.Layouts 1.3
import ReaderView 1.0

ApplicationWindow {
    id: window

    CReaderView {
        anchors.fill: parent
        id: readerView
    }

    Button {
        anchors.bottom: readerView.bottom
        anchors.horizontalCenter: readerView.horizontalCenter

        width: 64
        height: 64
        text: "Start"
    }
}

I haven't tested with a Layout instead of Button, but hope it'll work.
Oddly enough, if I anchor to window instead of readerView (which seems more logical because that's what I want to do semantically), it doesn't work right.