Using async call results in QML

Joey7796

in QT6
Q_INVOKABLE QFuture<int> BackendMethod(const QString& addr,const int& port);

I don't want to block the UI so I use an asynchronous method call。

When should await / async be used in QtQuick? Is there a roadmap or plan?
Or can I use some syntactic sugar to get asynchronous results? My software has a lot of asynchronous methods, and using signals to connect them all is not a good approach. Are there any standardized or engineered solutions?
Thanks。

GrecKo

You could inspire yourself from this : https://github.com/benlau/quickfuture

My guess is that can be simplified in Qt 6 with easier registration.

jeremy_k

An expedient solution is to wrap the asynchronous behavior in a customized C++ QObject, initiate the call through a property or Q_INVOKABLE, and later return the result through a property or signal.

Kai Nickel

Are you aware of the possibility of calling JS callbacks from C++?
I use something like this:

void Misc::doSomething(const QJSValue& callback) {
    // do sth async here but make sure to call the callback from the main thread
    callback.call();
}

In QML:

Misc.doSomething(() => { console.log("callback!"); })

You can also have arguments in the callback funtion, like for result or error.