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It looks like you are confusing the structure of how to nest a QGraphicsView and a QGraphicsScene. (Maybe it was just a typo?) <pre><code> QGraphicsView *widgetToScroll = new QGraphicsView(new QGraphicsScene(sa), sa); </code></pre> should be changed to <pre><code> QGraphicsView *widgetToScroll = new QGraphicsView(new QGraphicsScene(), sa); </code></pre> or <pre><code> QGraphicsView *widgetToScroll = new QGraphicsView(); sa->setWidget(widgetToScroll); </code></pre> When you add a QWidget to a layout, you change the widget's parent. When you set a widget (or QGraphicsView) to a QScrollArea, you change that widget's parent. See <a href="http://doc.qt.io/qt-5/objecttrees.html" rel="nofollow noreferrer">Object Trees & Ownership</a> for more information. So if you wanted to set up your QGraphicsView inside a QScrollArea your code would look like this: <pre><code> QWidget *appWindow = new QWidget; QScrollArea *sa = new QScrollArea(); // No need to specify a parent here if // you add it to a layout later sa->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOn); sa->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn); sa->setContentsMargins(50, 50, 50, 50); QGraphicsView *widgetToScroll = new QGraphicsView(); widgetToScroll->setAlignment(Qt::AlignLeft | Qt::AlignTop); widgetToScroll->resize(5000, 5000); sa->setWidget(widgetToScroll); // This sets the parent for widgetToScroll QVBoxLayout *appWindowLayout = new QVBoxLayout(); appWindowLayout->addWidget(sa); // This sets the parent for sa appWindow->setLayout(appWindowLayout); // This sets the parent for appWindowLayout appWindow->show(); </code></pre> As a side note... When using QGraphicsViews with a QGraphicsScene, instead of setting the margins using a QScrollArea's setContentsMargins, I use the QGraphicsView automatic scrolling and just set the scene rect to have a larger margin that the size of my content like so: <pre><code> QWidget *appWindow = new QWidget; QGraphicsView *widgetToScroll = new QGraphicsView(); QGraphicsScene *scene = new QGraphicsScene(); scene->addRect(0,0, 5000, 5000); widgetToScroll->setSceneRect(-50,-50, 5050, 5050); widgetToScroll->setScene(scene); QVBoxLayout *appWindowLayout = new QVBoxLayout(appWindow); appWindowLayout->addWidget(widgetToScroll); appWindow->setLayout(appWindowLayout); appWindow->show(); </code></pre> The QGraphicsView includes quite a bit more than just automatic scrolling when needed. You can resize everything inside of it and quite a bit more. It is great for 2D layouts, interactions and animations. See Qt's Graphics View Framework at <a href="http://doc.qt.io/qt-5/graphicsview.html" rel="nofollow noreferrer">http://doc.qt.io/qt-5/graphicsview.html</a> for more information. Here is more information that may be useful when using margins and paddings: <a href="http://doc.qt.io/qt-5/stylesheet-customizing.html#box-model" rel="nofollow noreferrer">The Box Model</a> used by QStyleSheets.
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1. COI'm still a newbie to Qt; your detailed answer really helped me understand Qt concepts more. I'll definitely try your suggestions.
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2. CONo problem. Good luck.
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