LazyView.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using NeuroAccessMaui.Services;
 
namespace NeuroAccessMaui.UI.Controls
{
    public class LazyView<T> : ContentView where T : View
    {
        public static readonly BindableProperty DelayMsProperty =
            BindableProperty.Create(
                nameof(DelayMs),
                typeof(int),
                typeof(LazyView<T>),
                100);
 
        public int DelayMs
        {
            get => (int)this.GetValue(DelayMsProperty);
            set => this.SetValue(DelayMsProperty, value);
        }
 
        private bool isLoaded = false;
 
        public LazyView()
        {
            // Start loading after appearing
            this.Loaded += async (s, e) => await this.TryLoadAsync();
        }
 
        private async Task TryLoadAsync()
        {
            if (this.isLoaded) return;
            this.isLoaded = true;
 
            if (this.DelayMs > 0)
                await Task.Delay(this.DelayMs);
 
            T PageOrView = ServiceRef.Provider.GetRequiredService<T>();
 
            if (PageOrView.BindingContext is null)
                PageOrView.BindingContext = this.BindingContext;
 
            // (Optional) If you want to support Page or View, you can check here
            if (PageOrView is View v)
                this.Content = v;
            else
                throw new InvalidOperationException($"{typeof(T).Name} is not a View.");
        }
    }
}