I’m currently working on implementing a CarouselView in .NET MAUI and want the position be changed by buttons rather than scrolling.

Incrementing works just fine, decrementing however seems to malfunction.

CarouselView in View:

<CarouselView Grid.Row="2"
              ItemsSource="{Binding Questions}"
              HorizontalScrollBarVisibility="Never"
              IndicatorView="indicatorView"
              Position="{Binding CarouselViewPosition}"
              EmptyView="No items to display."
              IsBounceEnabled="False"
              Loop="False">
    <CarouselView.ItemsLayout>
        <LinearItemsLayout Orientation="Horizontal"
                           SnapPointsType="MandatorySingle"
                           SnapPointsAlignment="Center" />
    </CarouselView.ItemsLayout>

    <CarouselView.ItemTemplate>
        <DataTemplate>
            <Frame BorderColor="DarkBlue">
                <Label Text="{Binding QuestionContent}" />
            </Frame>
        </DataTemplate>
    </CarouselView.ItemTemplate>
</CarouselView>

Code in ViewModel:

[ObservableProperty]
private ObservableCollection<Question> _questions = new();

[ObservableProperty]
[NotifyCanExecuteChangedFor(nameof(NextQuestionCommand))]
[NotifyCanExecuteChangedFor(nameof(PreviousQuestionCommand))]
private int _carouselViewPosition = 0;

//...

[RelayCommand]
private void OnNextQuestion()
{
    CarouselViewPosition += 1;
    Debug.WriteLine($"Increment position in carousel: {CarouselViewPosition}");
}

[RelayCommand]
private void OnPreviousQuestion()
{
    CarouselViewPosition -= 1;
    Debug.WriteLine($"Decrement position in carousel: {CarouselViewPosition}");
}

I’ve tried to follow the value with Debug.WriteLine.

The output is as expected when moving up three times:

Increment position in carousel: 1
Increment position in carousel: 2
Increment position in carousel: 3

After decrementing three times, however, the output is the following:

Decrement position in carousel: 2
Decrement position in carousel: 2
Decrement position in carousel: 2

Does anybody understand, what is happening here?