QGraphicsScene&QGraphicsview support

[tiny911]

I was wondering if there were any plans to support QGraphicsScene QGraphicsview, if so any idea when we can expect the crate to support it?

[ahayzen-kdab]

Thanks for taking the time to report this issue.

Our plans are initially to make it easier for developers themselves to express a binding using a CXX-Qt bridge to an existing Qt type, then once we have rearranged things internally we can start looking at wrapping more types in cxx-qt-lib.

The idea for 0.6 is that you should be able to write the following and then use the ffi::QPushButton type, in theory the same could be used for QGraphicsScene / QGraphicsView.

#[cxxqt::bridge]
mod ffi {
    extern "C++Qt" {
        include!(<QPushButton>);
        type QPushButton;

        #[rust_name = "set_text"]
        fn setText(self: Pin<&mut QPushButton>, text: &QString);

        #[qsignal]
        fn clicked(self: &QPushButton, bool checked);
    }
}

Note however that a lot of the QtWidgets API uses raw pointers, which means with CXX this becomes unsafe API. Constructors either need to use the helper in cxx-qt-lib or your own C++ trampoline. And we also need to wrap a few more useful types like quintptr etc. I think in the 0.7 and 0.8 cycles we should explore how to improve this.