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  1. Qt
  2. QTBUG-116464

QML/JS signal.connect(): Accept a context object like QObject::connect()

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      If we have QT_LOGGING_RULES="qt.qml.object.connect.info=true;" then the following code produces a runtime message:

      qt.qml.object.connect: Could not find receiver of the connection, using sender as receiver. Disconnect explicitly (or delete the sender) to make sure the connection is removed.

      QObject::connect() avoids this scenario by allowing the user to specify a "context object": https://doc.qt.io/qt-6/qobject.html#connect-5 It would be nice if the JS connect allowed the same.

      In addition, the contextless version of connect() should then be discouraged by qmllint, like what clazy does: https://github.com/KDE/clazy/blob/master/docs/checks/README-connect-3arg-lambda.md

       

      Code

      import QtQuick

Window {
    id: root
    width: 640
    height: 480
    visible: true

    Component {
        id: comp
        QtObject {
            signal finished()
            function doStuff() {
                // ...
                finished()
            }
        }
    }

    Component.onCompleted: {
        let obj = comp.createObject(root)
        obj.finished.connect(function() {
            console.log("Stuff done!")
        })

        obj.doStuff()
    }
}

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            qt.team.quick.subscriptions Qt Quick and Widgets Team
            skoh-qt Sze Howe Koh
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              Created:
              Updated:

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