[Interest] Qml ListView currentIndex behavior

[Dmitry Ashkadov]

05.08.2013 20:58, Nils Jeisecke пишет:
> Hi list,
>
> when explicitly setting a view's model to an empty array (or an empty
> ListModel, C++-Model, etc.) the currentIndex property changes from -1
> to 0. Initializing the model property with an empty model works as
> expected.
>
> ---
>
> import QtQuick 2.0
>
> Rectangle {
>    width: 360
>    height: 360
>
>    ListView {
>      id: view
>      anchors.fill: parent
>      // model: [] // this works, currentIndex will be -1
>      delegate: Text {
>        text: modelData
>      }
>    }
>
>    Text {
>      anchors { right: parent.right }
>      text: view.currentIndex
>      MouseArea {
>        anchors.fill: parent
>        onClicked: view.model = [] // now currentIndex becomes 0
>      }
>    }
> }
>
> ---
>
> This looks like a bug to me because 0 is not a valid index for an
> empty model. It's the same behavior in QtQuick 1 and QtQuick 2.
>
> Any ideas?

If I understand right, in code "model: []" the brackets are a QML list 
and it is empty. In code "view.model = []" the brackets are JS object of 
type Array.

I think the next should work as expected:

ListModel { id: emptyModel }
...
onClicked: view.model = emptyModel





>
> Nils
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