How to find a binding loop?

Kofr

Hi, I am getting this message from Qt

file:///D:/dev/tools/Qt/5.7/mingw53_32/qml/QtQuick/Controls/Private/BasicTableView.qml:551:13: QML FocusScope: Binding loop detected for property "itemSelected"

I work on quite complex project and I use

TableViewColumn {
                    id: column
                    width: tv1.width
 }

with TreeView
The error comes up when I use SelecionModel

selectionModel.setCurrentIndex(styleData.index, ItemSelectionModel.SelectCurrent)

...
selection: ItemSelectionModel  {
                    id: selectionModel
                    model: tv1.model
                }

How to find source of such error?
How to debug so I can find the origin?

NotJo4Ever

Try referencing the selection model by retrieving it from the TreeView instead of by id... And try giving the SelectionFlag as an int. See if either of those suggestions work. I have code that does something almost identical to what you are doing and am not receiving a binding loop.

TreeView {
id: tree
...
selection: ItemSelectionModel {
        model: tv1.model
    }
...
}

//Somewhere else I call the following.
tree.selection.setCurrentIndex( styleData.index, 3 );

Where 3 is Equivalent to QItemSelectionModel::ClearAndSelect

Works fine for me. More detail may be necessary as it is very possible that you are calling "setCurrentIndex" in the wrong place.

SGaist

Hi,

I've seen recently that there's a small tool to help finding these loops that might be of interest.

See here

Hope it helps.

Kofr

@SGaist this tool does not work. Have you tried?
I think the problem is in BasicTableView as I could not find loop manually yet.

Kofr

@NotJo4Ever it does not change anything

NotJo4Ever

where exactly are you calling setCurrentIndex?

Kofr

@NotJo4Ever

onClicked: {
                        selectionModel.setCurrentIndex(styleData.index, ItemSelectionModel.SelectCurrent)////tv1.selection.setCurrentIndex(styleData.index, ItemSelectionModel.SelectCurrent)//
                        //selectionModel.select(styleData.index, ItemSelectionModel.SelectCurrent)
                        mainW.contentX = tv1.itemIndention * (styleData.depth + 0.9) //0.9 is alignment coefficient
                    }

handler of delegate's signal clicked(var mouse) which is generated on click over current delegate

Kofr

Solved. Problem was in case of using styleData.selected

NotJo4Ever

So I was right from our chat?! Score!