QAbstractListModel resetModel lags

Dmitry89

I use QAbstractListModel with my ListView. The delegate of the ListView consist of 19 Rectangles with Text. When I reset the model, it takes about 300ms to recreate 1 delegate item. If there are 20-30 items in the new model data, it takes 5-6 sec. If I reset the model 2-3 times, it crashes with an error at this line:
endResetModel();
Is there a faster way to update a ListView content and how can I fix this crash problem?
Here is my minimized code:
@

QVariant TargetsModel::data(const QModelIndex & index, int role) const {
return QVariant(0); //does not matter
}
void TargetsModel::setModel(int ship, TableData &model)
{
beginResetModel();
m_data.replace(model); //Just replace old vector
endResetModel();
}
@

ListView delegate:

@
Column {
id: column
property double firstblockwidth: Math.round(column.width/17*7)
width: parent.width
spacing: 0

Row {
    z: 20
    spacing: 0
    CustomNumberField {
        width: Math.round(column.firstblockwidth/3)
        value:  complexnum
    }
    CustomNumberField {
        width: Math.round(column.firstblockwidth/3*2)-x
        value:  mcnum
    }
    CustomNumberField {
        width: Math.round(column.width/17*10.5)-x
        value: vip
    }
    CustomNumberField {
        width: Math.round(column.width/17*13)-x
        value: bearing
    }
    CustomNumberField {
        width: Math.round(column.width)-x
        value: distance/1000.0
    }
}

}
@

CustomNumberField:

@
Rectangle {
id: numberfield
property alias font: textfield.font
property var value: 0
property real minimumValue: 0
property real maximumValue: 0
property real decimals: 2

property string background: "#2f2f2f"

property bool edited: false
width: 25
height: 25
color: "#2f2f2f"
border.width: 1
border.color: "#6d6d6d"
Text {
    id: textfield
    font.pointSize: 10
    font.family: arialFont.name
    anchors.fill: parent
    anchors.margins: 2
    verticalAlignment: Qt.AlignVCenter
    text: numberfield.value
    color: "white"
}

}
@

Due to the non-standard shape of the delegate I can't use TableView (2 rows with different number of items)

morte

Hi, did you try to notify view of changes (beginInsertRows()/endInsertRows(), beginMoveRows()/endMoveRows(), etc.) instead of resetting whole model?