如何用棱镜实现Xamarin.Forms中按下和释放事件的松散耦合？

public class CustomEvent
{
    public event EventHandler OnPressed;
    public event EventHandler OnReleased;

    public void Pressed()
    {
        OnPressed?.Invoke(this, EventArgs.Empty);
    }

    public void Released()
    {
        OnReleased?.Invoke(this, EventArgs.Empty);
    }
}

using Prism.Mvvm;

public class MainPageViewModel : BindableBase
{
    private CustomEvent _customEvent;

    public MainPageViewModel()
    {
        _customEvent = new CustomEvent();
        _customEvent.OnPressed += CustomEvent_OnPressed;
        _customEvent.OnReleased += CustomEvent_OnReleased;
    }

    private void CustomEvent_OnPressed(object sender, EventArgs e)
    {
        // 处理按下事件
    }

    private void CustomEvent_OnReleased(object sender, EventArgs e)
    {
        // 处理释放事件
    }
}

<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:prism="clr-namespace:Prism.Behaviors;assembly=Prism.Forms"
             x:Class="YourNamespace.MainPage">
    <ContentPage.Behaviors>
        <prism:EventToCommandBehavior EventName="OnPressed" Command="{Binding PressedCommand}" />
        <prism:EventToCommandBehavior EventName="OnReleased" Command="{Binding ReleasedCommand}" />
    </ContentPage.Behaviors>
    <!-- 页面内容 -->
</ContentPage>

using Prism.Commands;

public class MainPageViewModel : BindableBase
{
    private CustomEvent _customEvent;

    public DelegateCommand PressedCommand { get; private set; }
    public DelegateCommand ReleasedCommand { get; private set; }

    public MainPageViewModel()
    {
        _customEvent = new CustomEvent();
        _customEvent.OnPressed += CustomEvent_OnPressed;
        _customEvent.OnReleased += CustomEvent_OnReleased;

        PressedCommand = new DelegateCommand(OnPressed);
        ReleasedCommand = new DelegateCommand(OnReleased);
    }

    private void CustomEvent_OnPressed(object sender, EventArgs e)
    {
        PressedCommand.Execute();
    }

    private void CustomEvent_OnReleased(object sender, EventArgs e)
    {
        ReleasedCommand.Execute();
    }

    private void OnPressed()
    {
        // 处理按下事件
    }

    private void OnReleased()
    {
        // 处理释放事件
    }
}