Traits for CxxQtType/QtObject #562
Description
We could move some of our "magic" methods into traits, which would make it a lot more obvious where they are coming from, and would allow us to e.g. "inherit" methods from QObject, reason about types, etc.
// cxx-qt crate - may also need to go in cxx-qt-lib
mod ffi {
extern "C++" {
type QObject;
fn children(self: &QObject) -> QList<*mut QObject>;
fn objectName(self: &QObject) -> QString;
}
}
// Note: QtObject vs QObject
trait QtObject {
fn as_qobject(&self) -> &cxx_qt_lib::QObject;
fn as_qobject_mut(&mut self) -> Pin<&mut cxx_qt_lib::QObject>;
fn children(&self) -> QList<*mut QObject> {
as_qobject().children()
}
fn objectName(&self) -> Pin<&mut cxx_qt_lib::QObject> {
as_qobject().objectName()
}
// ... other methods wrapped as needed.
}
trait CxxQtType {
type Inner;
fn rust(&self) -> &Self::Inner;
fn rust_mut(self: Pin<&mut self>) -> &mut Self::Inner;
}Then in C++, we could generate a generic cast to QObject, similar to how we do constructors.
template<typename T>
QObject *as_qobject(T* t) {
return static_cast<QObject*>(t);
}