Sharpnado.Shadows: add many shadows to any Xamarin.Forms view

Get it from Github and Nuget:

	https://github.com/roubachof/Sharpnado.Shadows

Supported platforms:

• Android
• iOS
• UWP

Read the doc on https://github.com/roubachof/Sharpnado.Shadows.

Presentation

Add as many custom shadows as you like to any Xamarin.Forms view (Android, iOS, UWP).

• You can specify each shadow Color, Opacity, BlurRadius, and Offset
• Simply implement Neumorphism
• You can add one shadow, 3 shadows, 99 shadows, to any Xamarin.Forms element
• Animate any of these property and make the shadows dance around your elements
• Only dependency is Xamarin.Forms, no AndroidX, no SkiaSharp needed!

The story

I first wanted to add a Neumorphism style to the MaterialFrame.

A Neumorphism effect can be achieved using too different shadows, a bright one ont top left, and a dark one on bottom right.

On UWP and iOS it wasn't really difficult to implement since there are some build-in mechanism for that.

But on Android, oh boy, there is nothing.
You can only play with Elevation.
So I started creating shadows from scratch with RenderScript and its blurring script. I was beginning to have good looking results when it struck me:

Since I can create 2 specific shadows for the 3 platforms, why not create a Xamarin.Forms shadow component allowing the user to add as many custom shadows he wants to a Xamarin.Forms View ?

Boom, Sharpnado.Shadows was born :)

Using Shadows

Shadows is a container for any Xamarin.Forms view.
Just wrap your view in it and start adding shadows:

```xml ```

Thanks to the CornerRadius property you can match your target corner to achieve a perfect shadow.
For example, you can add a shadow to a rounded button:

```xml ```

Neumorphism

Since Neumorphism implementation is made of 2 shadows, one bright at the top left, one dark at the bottom right, achieving a Neumorphism style with Shadows for all the views is really easy:

<Style ApplyToDerivedTypes="True" TargetType="sh:Shadows">
    <Setter Property="CornerRadius" Value="10" />
    <Setter Property="Shades">
        <sh:ImmutableShades>
            <sh:Shade BlurRadius="10"
                      Opacity="1"
                      Offset="-10,-10"
                      Color="White" />
            <sh:Shade BlurRadius="10"
                      Opacity="1"
                      Offset="6, 6"
                      Color="#19000000" />
        </sh:ImmutableShades>
    </Setter>
</Style>

If you want to add Neumorphism to specific elements a NeumorphismShades markup extension will help you with that:

<sh:Shadows Grid.Row="1"
            Grid.Column="0"
            CornerRadius="40"
            Shades="{sh:NeumorphismShades}">
    <ImageButton WidthRequest="60"
                 HeightRequest="60"
                 Padding="20"
                 HorizontalOptions="Center"
                 VerticalOptions="Center"
                 BackgroundColor="#F0F0F3"
                 CornerRadius="30"
                 Source="{StaticResource IconPlusGray}" />
</sh:Shadows>

<sh:Shadows Grid.Row="1"
            Grid.Column="1"
            CornerRadius="10"
            Shades="{sh:NeumorphismShades}">
    <Button Style="{StaticResource TextHeadline}"
            WidthRequest="120"
            HeightRequest="60"
            HorizontalOptions="Center"
            VerticalOptions="Center"
            BackgroundColor="#F0F0F3"
            CornerRadius="10"
            Text="Reset"
            TextColor="Gray" />
</sh:Shadows>

Be creative!

One last thing: all properties of a Shade are animatable.

You can achieve nice effects thinking outside the box!
Have a look at the BeCreative.xaml file and its code-behind.