TemplateSelectorContentView.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
 
namespace NeuroAccessMaui.UI.Controls
{
    public class TemplateSelectorContentView : ContentView
    {
        public static readonly BindableProperty ItemProperty =
             BindableProperty.Create(
                  nameof(Item),
                  typeof(object),
                  typeof(TemplateSelectorContentView),
                  defaultValue: null,
                  propertyChanged: OnItemChanged);
 
        public static readonly BindableProperty TemplateSelectorProperty =
             BindableProperty.Create(
                  nameof(TemplateSelector),
                  typeof(DataTemplateSelector),
                  typeof(TemplateSelectorContentView),
                  defaultValue: null,
                  propertyChanged: OnItemChanged);
 
        public object Item
        {
            get => (object)this.GetValue(ItemProperty);
            set => this.SetValue(ItemProperty, value);
        }
 
        public DataTemplateSelector TemplateSelector
        {
            get => (DataTemplateSelector)this.GetValue(TemplateSelectorProperty);
            set => this.SetValue(TemplateSelectorProperty, value);
        }
 
        private static void OnItemChanged(BindableObject bindable, object oldValue, object newValue)
        {
            if (bindable is TemplateSelectorContentView View)
            {
                View.ApplyTemplate();
            }
        }
 
        private void ApplyTemplate()
        {
            if (this.TemplateSelector is null || this.Item is null)
            {
                this.Content = null;
                return;
            }
 
            DataTemplate? Template = this.TemplateSelector.SelectTemplate(this.Item, this);
            if (Template is not null)
            {
                this.Content = (View)Template.CreateContent();
            }
            else
            {
                this.Content = null;
            }
        }
    }
 
}