QML custom notify event

Grunk

Hello,

I have a QObject with 2 properties :

Q_PROPERTY(int isInitialized READ isInitialized WRITE setInitialized NOTIFY initChanged)
Q_PROPERTY(QString message READ getMessage WRITE setMessage NOTIFY messageChanged)

I set this object to my QML like this :

mQuickWidget->engine()->rootContext()->setContextProperty("splash", &mSplash);

And then i my QML i use the properties like this :

Item {
    MouseArea {
            anchors.fill: parent
            onClicked: {
                splash.isInitialized= 1
	        splash.message="test";
            }
       }
}

This part is working great. I can send value from C++ to QML by using my mSplash object or i can edit my mSplash object from QML by clicking.

I would like in my QML to be able to "override" the initChanged NOTIFY to be able to do a specific action according to the value.
I have tried something like

Component.onCompleted: {
        splash.onInitChanged = function(){
            if(splash.isInitialized === 2) {
                //Do something here
            }
        }
}

But it give me a TypeError : Cannot assign to read-only property.

I'm a complete beginner with QT et QML , so i probably missing something obvious here.

Thanks

SGaist

Hi,

Are you looking for the connect statement ?

Grunk

Thanks , I finally found a solution which use a Connections object :

Connections {
	target: splash
	onInitChanged : {
		if(splash.isInitialized === 2) {
			//Do something
		}
	}
}

It seems that the connect statement you are talking about is kind of the same thing right ? Should i use one more than an other ?

By doing :

Component.onCompleted: {
	splash.onInitChanged.connect(doStuff);
}

function doStuff() {
	if(splash.isInitialized === 2) {
		//Do something
	}
}

I have the exact same result , so i don't really know which solution to choose :)

SGaist

I'd say it depends whether you'll reuse doStuff elsewhere. Otherwise, coding style and personnel taste.