CarouselView Validation

Question

I have a CarouselView with multiple ContenViews as if it were a "step by step" form. I wonder how I could validate the content before the user swipes. Do I have to do everything in the CurrentItemChangedCommand?

Answer 1

I have:

<CarouselView x:Name="CarouselRegister" Position="{Binding Position}" IndicatorView="indicatorView" 
                  Loop="False" 
                  IsSwipeEnabled="False">
        <CarouselView.ItemsSource>
            <x:Array Type="{x:Type ContentView}">
                <views:CenterView />
                <views:PersonalInformationView />
                <views:AddressView />
            </x:Array>
        </CarouselView.ItemsSource>
        <CarouselView.ItemTemplate>
            <DataTemplate x:DataType="d:ContentView">
                <ContentView Content="{Binding .}" />
            </DataTemplate>
        </CarouselView.ItemTemplate>
    </CarouselView>
    <StackLayout Orientation="Horizontal">
        <Button Text="{xct:Translate Back}" BackgroundColor="DarkOrange" Command="{Binding BackCommand}">
            <Button.Triggers>
                <DataTrigger TargetType="Button" Binding="{Binding Position}" Value="0">
                    <Setter Property="IsEnabled" Value="False" />
                </DataTrigger>
            </Button.Triggers>
        </Button>
        <IndicatorView x:Name="indicatorView"
                       IndicatorSize="14"
                       IndicatorsShape="Circle"
                       Padding="14"
                       IndicatorColor="LightGray"
                       SelectedIndicatorColor="{StaticResource Primary}"
                       HorizontalOptions="CenterAndExpand">
        </IndicatorView>
        <Button Text="{xct:Translate Next}" BackgroundColor="DarkGreen" Command="{Binding NextCommand}" />
    </StackLayout>

And:

 public ICommand NextCommand => new Command(Next);

    private void Next()
    {
        if (Position + 1 != 0)
        {
            Position++;
        }
    }

    public ICommand BackCommand => new Command(Back);

    private void Back()
    {
        if (Position != 0)
        {
            Position--;
        }
    }

In each ContentView, I must do a validation through Behavior with XamarinCommunityToolkit, but I don't know very well how to approach it, since each Behavior is independent in ContentView, any ideas with my example?