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public class FloatingActionButtonView : View
{
    public static readonly BindableProperty ImageNameProperty = BindableProperty.Create<FloatingActionButtonView,string>( p => p.ImageName, string.Empty);
    public string ImageName 
    {
      get { return (string)GetValue (ImageNameProperty); } 
      set { SetValue (ImageNameProperty, value); } 
    }
  
    public static readonly BindableProperty ColorNormalProperty = BindableProperty.Create<FloatingActionButtonView,Color>( p => p.ColorNormal, Color.White);

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public enum FloatingActionButtonSize
{
	Normal,
	Mini
}

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public class FloatingActionButtonViewRenderer : ViewRenderer<FloatingActionButtonView, FrameLayout>
{
    ...
    private readonly Android.Content.Context context;
    private readonly FloatingActionButton fab;

    public FloatingActionButtonViewRenderer()
    {
        context = Xamarin.Forms.Forms.Context;
	    fab = new FloatingActionButton(context);

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public class MainPage : ContentPage
{
    public MainPage()
    {
        var fab = new FloatingActionButtonView() {
            ImageName = "ic_add.png",
            ColorNormal = Color.FromHex("ff3498db"),
            ColorPressed = Color.Black,
            ColorRipple = Color.FromHex("ff3498db")
        };

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public class CarouselLayout : ScrollView
{
	public enum IndicatorStyleEnum
	{
		None,
		Dots,
		Tabs
	}

	readonly StackLayout _stack;

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public static readonly BindableProperty ItemsSourceProperty =
    BindableProperty.Create<CarouselLayout, IList> (
        view => view.ItemsSource,
        null,
        propertyChanging: (bindableObject, oldValue, newValue) => {
        ((CarouselLayout)bindableObject).ItemsSourceChanging ();
    },
        propertyChanged: (bindableObject, oldValue, newValue) => {
        ((CarouselLayout)bindableObject).ItemsSourceChanged ();
    }

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void SnapScroll ()
{
    var roughIndex = (float)_scrollView.ScrollX / _scrollView.Width;

    var targetIndex = 
        _deltaX < 0 ? Math.Floor (roughIndex)
        : _deltaX > 0 ? Math.Ceil (roughIndex)
        : Math.Round (roughIndex);

    ScrollToIndex ((int)targetIndex);

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void NativeScrolled (object sender, EventArgs e)
{
    var center = _native.ContentOffset.X + (_native.Bounds.Width / 2);
    ((CarouselLayout)Element).SelectedIndex = ((int)center) / ((int)_native.Bounds.Width);
}

void ElementPropertyChanged(object sender, PropertyChangedEventArgs e) {
    if (e.PropertyName == CarouselLayout.SelectedIndexProperty.PropertyName && !Dragging) {
        ScrollToSelection (false);
    }

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public enum IndicatorStyleEnum
{
    None,
    Dots,
    Tabs
}

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void ItemsSourceChanged ()
{
    if (ItemsSource == null) return;

    var countDelta = ItemsSource.Count - Children.Count;

    if (countDelta > 0) {
        for (var i = 0; i < countDelta; i++) 
        {
            CreateDot();