prs/prs.mobile.new/PRS.Mobile/Modules/Deliveries/Edit/DeliveryEditViewModel.cs

using System;
using System.Threading.Tasks;
using Comal.Classes;
using InABox.Core;
using InABox.Mobile;
using Xamarin.Forms;

namespace PRS.Mobile
{
    public class DeliveryEditViewModel : MobileViewModel<Delivery,DeliveryShell>
    {
        
        public DeliveryDocumentModel Documents { get; set; }
        
        public DeliveryItemModel Items { get; set; }
        
        public DeliveryFormModel Forms { get; set; }
        
        public DeliveryEditViewModel()
        {
            Documents = new DeliveryDocumentModel(App.Data,
                () => new Filter<DeliveryDocument>(x => x.EntityLink.ID).IsEqualTo(Item?.ID ?? Guid.Empty));
            
            Items = new DeliveryItemModel(App.Data, 
                () => new Filter<DeliveryItem>(x => x.Delivery.ID).IsEqualTo(Item?.ID ?? Guid.Empty));
            
            Forms = new DeliveryFormModel(App.Data, 
                () => new Filter<DeliveryForm>(x => x.Parent.ID).IsEqualTo(Item?.ID ?? Guid.Empty));
        }

        protected override void DoLoad()
        {
            var tasks = new Task[]
            {
                Task.Run(() =>
                {
                    if (Item != null && Item.ID != Guid.Empty)
                        Items.Refresh(true);
                }),
                
                Task.Run(() =>
                {
                    if (Item != null && Item.ID != Guid.Empty)
                        Documents.Refresh(true);
                }),
                
                Task.Run(() =>
                {
                    if (Item != null && Item.ID != Guid.Empty)
                        Forms.Refresh(true);
                })
            };
            Task.WaitAll(tasks);
        }
        
        public override bool IsChanged => Item == null || Item.ID == Guid.Empty || Item.IsChanged();
    }
}