ListView currentIndex strange behaviour

[justmatt]

Hello.
This is very confusing for me, I don't know why this is working the way it is.
Let me explain.
I have ApplicationWindow which contains ListView. I want ListView to be the size of its parent.

import QtQuick.Controls 1.3
import QtQuick 2.4
import QtQuick.Layouts 1.1
import QtQml.Models 2.1

ApplicationWindow {
    width: 800
    height: 600
    visible: true
    id: window

    property alias cwidth: window.width

    ListView {
        id: listView
        orientation: ListView.Horizontal
        snapMode: ListView.SnapOneItem
        boundsBehavior: Flickable.StopAtBounds
        highlightMoveDuration: 250
        currentIndex: 1

        height: parent.height

        // Case #1
        width: parent.width

        // Case #2
//                width: window.width

        // Case #3
//                anchors.fill: parent

        model: ObjectModel {
            Page {
                width: listView.width
                height: listView.height
                color: "yellow"
                text: "Page1"
            }

            Page {
                width: listView.width
                height: listView.height
                color: "cyan"
                text: "Page2"
            }

            Page {
                width: listView.width
                height: listView.height
                color: "magenta"
                text: "Page3"
            }
        }
    }
}

//Page is simply a Rectangle with a Text
import QtQuick 2.4

Rectangle {
    smooth: true
    antialiasing: true

    property alias text: nameText.text

    Text {
        id: nameText
        anchors.centerIn: parent
        text: "PAGE 1"
        font.pointSize: 24
    }
}

I set listView.currentIndex to 1 so the first thing I am supposed to see, after I launch the application is Page2 with cyan color.

There are 3 cases.

• parent.width
• window.width
• anchors.fill: parent OR window

When I set listView.width to parent.width and launch application, I see Page1 instead of Page2 - Not good.
When I set listView.width to window.width and launch application, I see Page2 - Good.
When I set anchors.fill to parent and launch application, I see Page1 instead of Page2 - Not good.

When I print listView.currentIndex property, it says it has value 1(in each case), exactly what I assigned to it.

Do you have any idea why this happens? I would be very grateful if someone could explain it to me.