Read of delegate objectName

Galilio

Hello everybody,

I have something like this:
QML:

ListView{
id: listViewId
objectName:"listViewObj"
....
delegate: Rectangle {
	id: rectnagleId
	objectName: "rectangleDelegate"
	....
	}
}

and how can i get the property from the delegate?

IntruderExcluder

We need more info to understand what do you want to do. But since delegate property is Component you cannot acces anything by id rectnagleId. This id is internal only for that rectangle.

Galilio

I want to write a unittest for the QML file.
I could access all objects using ObjectName and check the property.

at delegate I can not use objectname and my question how can I access the property within this delegate?

IntruderExcluder

As I said, in fact your delegate isn't exist like an any item. ListView will instantiate such items by demand, you can access only really existed items.

Galilio

@intruderexcluder
How can I then test the property of this delegate with Unittest?

IntruderExcluder

Not sure, but if you want to test only objectName property you can create dummy component and then create object from this component. Get delegate property of your ListView and then create object via QQmlComponent or Qt.createComponent depends from which side you want to test your delegate. Hope this can help.

Galilio

I really did not understand that exactly.
can you please explain to me more exactly with an example?

many thanks

IntruderExcluder

In case of QML you can create Rectangle object directly from delegate property:

    ListView {
        id: view
        objectName: "listview"
        delegate: Rectangle { objectName: "delegaterect" }
    }

    Component.onCompleted: {
        let d = view.delegate.createObject(null);
        console.log(d.objectName);
        d.Component.destruction.connect(() => { console.log("READY TO BE DESTRUCTED"); });
        d.destroy();
    }

In case of C++ side code can be something like:

    auto lv = engine.rootObjects()[0]->findChild<QObject*>("listview");
    auto component = lv->property("delegate").value<QQmlComponent*>();
    auto delegate = component->create();
    qDebug() << delegate->objectName();
    delegate->deleteLater();

J.Hilk

@galilio said in Read of delegate objectName:

ListView{
id: listViewId
objectName:"listViewObj"
....
delegate: Rectangle {
	id: rectnagleId
	objectName: "rectangleDelegate"
	....
	}
}

//to get item and access the properies

function getItemAtIndex(index){
    var item = listViewId.itemAtIndex(index);
    if(item){
          console.log(item.objectName)
    }
}

Galilio

@j-hilk
my qt version is 5.9.1

J.Hilk

@galilio fair enough.

alright, trick 17 (untested)

ListView{
id: listViewId
objectName:"listViewObj"
var testObject: undefined
signal assignToObject(var id)
....
delegate: Rectangle {
	id: rectnagleId
	objectName: "rectangleDelegate"
        Connections{
             target: listViewId
             onAssignToObject: if(index === id) listViewId.testObject = rectnagleId
        }
	....
	}
}
//to get item and access the properies
        onTestObjectChanged:{
            if(testObject)
                console.log(testObject.objectName)
        }

Galilio

@j-hilk said in Read of delegate objectName:

onAssignToObject: if(index === id) listViewId.testObject = rectnagleId

what is your id here
Thanks

J.Hilk

@galilio said in Read of delegate objectName:

@j-hilk said in Read of delegate objectName:

onAssignToObject: if(index === id) listViewId.testObject = rectnagleId

what is your id here
Thanks

the argument of the signal
signal assignToObject(var id)

Galilio

This post is deleted!

Galilio

Sorry:
nothing happens
Slot was not called

J.Hilk

@galilio
works fine in my test file

import QtQuick 2.12
import QtQuick.Window 2.12
import QtQuick.Controls 2.0

Window {
    visible: true
    width: 400
    height: 750
    title: qsTr("Hello World")

    id: root
    property int testIndex: 0
    Timer{
        running: true
        interval: 1000
        repeat: true
        onTriggered: {
            listViewId.assignToObject(root.testIndex)
            testIndex++
            if(testIndex >= 10)
                testIndex = 0
        }
    }

    ListView{
        id: listViewId
        anchors.fill: parent
        objectName:"listViewObj"
        property var testObject: undefined
        onTestObjectChanged:{
            if(testObject)
                console.log(testObject.objectName)
        }
        signal assignToObject(var id)

        model: 10
        spacing: 2

        delegate: Rectangle {
            id: rectnagleId
            objectName: "rectangleDelegate" + index
            Text {
                text: modelData
                anchors.centerIn: parent
            }
            width: listViewId.width
            height:  20
            color: "green"
            Connections{
                target: listViewId
                onAssignToObject: if(index === id) listViewId.testObject = rectnagleId
            }
        }
    }
}

Galilio

@J-Hilk

and how is it if I want to test the delegate with unit test (in cpp) sorry

Shivaraj

@Galilio how do you access the objects using objectName can you share some code

dheerendra

@Shivaraj

Delegate you can't access using the object name. These are dynamically created object.