[SOLVED] How to restore ListView's selected item after the collection (model) changes?

Aralox

Hey there, the title says it all.

I have buttons that add and remove items from the QList<QObject*> that my ListView is bound to. The currentItem of the ListView reverts back to the first item whenever I add or remove items - is there a way to preserve this, at least for additions?

Thanks

p3c0

Hi,

Can you show how do you remove item ? Can you post the code ?

Aralox

The relevant QML looks like this:

@ Button{
width: 100; height: 30
text: "remove"
onClicked: {
myModel.removeThing(myListView.currentIndex)
}
}
...

ListView {
id: myListView
anchors.fill: parent
model: myModel.list

delegate: Rectangle {
 width: 300;
 height: 30;

 Text {
  text: model.modelData.stuff
 }

                                    ..... [logic for selecting items].....

}

}

@

The C++ (within myModel):

@ void removeThing(int index)
{
_list.removeAt(index);
}@

where _list is a QList<QObject*> which is exposed as a Q_PROPERTY that 'myListView' binds to.

p3c0

How did you set the currentIndex of the ListView ?

Aralox

in my delegate, I have this:

@ MouseArea {
anchors.fill: parent
onClicked: {
myListView.currentIndex = index
}
}@

p3c0

So when you add you can "incrementCurrentIndex()":http://qt-project.org/doc/qt-5/qml-qtquick-listview.html#incrementCurrentIndex-method or "decrementCurrentIndex()":http://qt-project.org/doc/qt-5/qml-qtquick-listview.html#decrementCurrentIndex-method on removal.

Aralox

ahh right thats so obvious, ive just saved and restored the index before and after my add now. Thanks!

p3c0

You're welcome :)
You can mark the post as solved.

Aralox

How do I do that? just put "[SOLVED]" in the title?

p3c0

bq. just put “[SOLVED]” in the title?

Yes. This is how it works currently :)