QTimer::singleShot equivalent for QML

Question

Consider this C++ statement (example from docs):

QTimer::singleShot(600000, &app, SLOT(quit()));

How to do the same in .qml JavaScript, something like this QML:

Rectangle {
    property int counter: 0
    onCounterChanged: {
        if (counter > 42) {
            // do equivalent of above C++ statement here
        }
    }
    // more code, which actually manipulates counter 
}

There's the obvious solution of having separate Timer, which is then started by this JavaScript code, and I'll accept that as an answer if a one-liner is not possible. Is it?

Answer 1

I ended up adding this to my main.qml:

Component {
    id: delayCallerComponent
    Timer {
    }
}

function delayCall( interval, callback ) {
    var delayCaller = delayCallerComponent.createObject( null, { "interval": interval } );
    delayCaller.triggered.connect( function () {
        callback();
        delayCaller.destroy();
    } );
    delayCaller.start();
}

Which can be used like this:

delayCall( 1000, function () { ... } );

Answer 2

Change "repeat" property to false for Timer object.

import QtQuick 1.0

Item {
    Timer {
        id: timer
        interval: 600000
        running: false
        repeat: false
        onTriggered: Qt.quit()
    }

    Rectangle {
        property int counter: 0
        onCounterChanged: {
            if (counter > 42) {
                timer.running = true
            }
        }
    }
}