QML List View is not updating when the model is updated

yegender

Hi everyone,

When, when the data is added or removed, qml model doesn't update. But when I change the existing data it updates.

Function that add data:

        beginInsertRows(QModelIndex(), rowCount(), rowCount());
        ApplicationItem *item = new ApplicationItem;
        item->id = id;
        item->iconName = info.value("iconName").toString();
        item->visibleName = info.value("visibleName").toString();
        item->isActive = info.value("active").toBool();
        item->wids.append(wid);

        if (!desktopPath.isEmpty()) {
            QMap<QString, QString> desktopInfo = Utils::instance()->readInfoFromDesktop(desktopPath);
            item->iconName = desktopInfo.value("Icon");
            item->visibleName = desktopInfo.value("Name");
            item->exec = desktopInfo.value("Exec");
            item->desktopPath = desktopPath;
        }

        m_Items << item;
        endInsertRows();

        emit itemAdded();
        emit countChanged();

and the remove data function:

    ApplicationItem *item = findItembyWId(wid);
            
                if (!item)
                    return;
            
                item->wids.removeOne(wid);
            
                if (item->currentActive >= item->wids.size())
                    item->currentActive = 0;
            
                handleDataChangedFromItem(item);
            
                if (item->wids.isEmpty()) {
                    if (!item->isPinned) {
                        int index = indexOf(item->id);
            
                        if (index == -1)
                            return;
            
                        beginRemoveRows(QModelIndex(), index, index);
                        m_Items.removeAll(item);
                        endRemoveRows();
            
                        emit itemRemoved();
                        emit countChanged();
                    }
                }

There isn't special in QML. It's implemented in standard way.

Thank you

yegender

I found out that row count isn't updating. It's updating in every part of the class except the rowCount() function. When I called list size, when a item is appending, it updated, but rowCount() doesn't. Here is the function:

int AppModel::rowCount(const QModelIndex &parent = QModelIndex()) const
{
    Q_UNUSED(parent)
    return m_Items.size();
}```

piervalli

@yegender
In the beginRemoveRows you need specify the range of rows to remove. The function removeAll clear a one or more items?

yegender

@piervalli It's assumed to clear one. As the reference code I used a tutorial for this app removes one Item. I found that rowCount() always return same value in qml. But it updates in c++. and i used qDebug() << m_Items.size() in this function. It also gives me same number. I am confused. what's going on. If you want to see full code it's :

header file: https://github.com/yegender124001/avdan-os-dock/blob/master/appmodel.h

definations: https://github.com/yegender124001/avdan-os-dock/blob/master/appmodel.cpp