Show Qt3D stuff inside QWidget in Qt5

问题:

So I felt all warm and fuzzy inside after reading that Qt3D has re-emerged in a v2.0 and is in fact becoming a part of Qt5 soon and that parts of it is already available for testing as a tech preview.

I set out with a simple plan, I would have Qt3D working inside a widget in my existing C++/widgets based application. However the only example I could find that shows how to use Qt3D from C++ is called basicshapes-cpp, and it shows some shapes rendered in a separate OpenGL/Qt3D prepared window (class that extends QWindow) as opposed from a QWidget.

Now I read about the role of QWindow vs. QWidget and how it all hangs together neatly, but I am still struggling to understand how I can port the Qt3D code from the basicshapes-cpp program to run inside a QWidget. What are the basic steps that need to observed?

回答1:

This extraction of this post shows how it works:

#include <QObject>
#include <QWidget>
#include <Qt3DExtras/Qt3DWindow>

class Qt3DWidget
      : public QWidget
{
    Q_OBJECT
    QWidget *container;

public:
    explicit Qt3DWidget(QWidget *parent = nullptr);

};

Qt3DWidget::Qt3DWidget(QWidget *parent)
   : QWidget(parent)
{
    auto view = new Qt3DExtras::Qt3DWindow();

    // put Qt3DWindow into a container in order to make it possible
    // to handle the view inside a widget
    container = createWindowContainer(view,this);

    // ... further stuff goes here
}