Repeater with QAbstractListModel: Repeater does not update

maxwell31

Hi,

I am doing a plotting library. For this I made a QQuickItem which exposes a QAbstractListModel for the ticks of the axis to qml. Now I have a problem with drawing the ticks and labels, which I want to do using a repeater:

Item{
    id: root
    property int tickLength: 5
    property int tickWidth: 1
    anchors.fill: parent
    visible: true
    property var tickModel: plot.xTickModel

    Repeater {
        model: tickModel
        Rectangle{
            height: tickLength
            width: tickWidth
            x: model.PositionRole
            y: parent.height-height
            visible: true
            color: "black"
            border.width: 2
        }

    }

    Repeater {
        model: tickModel
        Text {
            text: PositionLabelRole
            x: PositionRole-width/2-tickWidth/2.0
            y: parent.height+8
            font.pixelSize: Style.fontSizeAxisLabel

        }
    }

However, nothing is drawn on the screen. Outside, the repeater, I tested that every time the ticks are updated

console.log("tickmodel",xAxis.tickModel.data(xAxis.tickModel.index(1,0),256))

is giving the correct results. So What am I doing wrong here?

maxwell31

What I found out so far:
The repeater never seems to call the data function of my model. Here is my setTicks Function in case the signals I emit there are relevant.:

void TickModel::setTicks(std::vector<double> &pos,std::vector<QString> &labels) {
  beginRemoveRows(QModelIndex(),0,_tickPos.size()-1);
  _tickPos.clear();
  _tickLabels.clear();
  endRemoveRows();
  beginInsertRows(QModelIndex(), 0, _tickPos.size()-1);
  _tickPos = std::move(pos);
  _tickLabels = std::move(labels);
  endInsertRows();
}

Is there something I need to do to get the repeater updated? Or is the problem, that I made the model available to qml as a Q_PROPERTY (see https://forum.qt.io/topic/104303/can-i-expose-a-c-model-as-q_property/6) and have no notify signal?

maxwell31

This post is deleted!

maxwell31

@maxwell31 said in Problem using Repeater with QAbstractListModel:

beginInsertRows(QModelIndex(), 0, _tickPos.size()-1);

This should have been pos noat _tickPos, now it works

Gojir4

@maxwell31 As you are reseting the whole content of your model, you can call begineResetModel() and endResetModel() respectively at start and end of your function setTicks().

maxwell31

Thank you for the suggestion, I will change this