prs/prs.mobile/comal.timesheets/DigitalForms/ExistingForms/ExistingFormsViewModel.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Runtime.CompilerServices;
using System.Windows.Input;
using Xamarin.Forms;

namespace comal.timesheets
{
    public class ExistingFormsViewModel : INotifyPropertyChanged  
    {
        
        public event PropertyChangedEventHandler PropertyChanged;

        protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }

        protected bool SetField<T>(ref T field, T value, [CallerMemberName] string propertyName = null)
        {
            if (EqualityComparer<T>.Default.Equals(field, value)) return false;
            field = value;
            OnPropertyChanged(propertyName);
            return true;
        }
        
        public ExistingFormsViewModel()
        {
            TapCommand = new Command<object>(Tapped);
        }

        private IModel _dataModel;
        public IModel DataModel
        {
            get => _dataModel;
            set
            {
                _dataModel = value;
            }
        }

        public Func<IModel, IDigitalFormInstanceShell[]> Property;

        
        public String AppliesTo
        {
            get;
            set;
        }
        
        public IDigitalFormInstanceShell[] Forms { get; private set; }
        
        private bool _isRefreshing = false;

        public ICommand RefreshCommand { get; private set; }

        public void Refresh(bool force)
        {
            IsRefreshing = true;

            _dataModel.Refresh(force, () => Device.BeginInvokeOnMainThread(() =>
            {
                Forms = Property?.Invoke(_dataModel);
                IsRefreshing = false;
            }));
        }
        
        public bool IsRefreshing { 
            get { return _isRefreshing; }
            set {
                _isRefreshing = value;
                OnPropertyChanged(nameof(IsRefreshing));
            }
        }
        public ICommand TapCommand { get; private set; }
        
        private void Tapped(object sender)
        {
  
        }
        
    }
}