SellEDalerViewModel.cs

using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;
using NeuroAccessMaui.Services;
using NeuroAccessMaui.Services.UI;
using NeuroAccessMaui.UI.Pages.Main.Calculator;
using System.ComponentModel;
using Waher.Content;
 
namespace NeuroAccessMaui.UI.Pages.Wallet.SellEDaler
{
    public partial class SellEDalerViewModel : XmppViewModel
    {
        private readonly TaskCompletionSource<decimal?>? result;
        private bool sellButtonPressed = false;
 
        public SellEDalerViewModel(SellEDalerNavigationArgs? Args)
            : base()
        {
            this.Currency = Args?.Currency;
            this.result = Args?.Result;
 
            this.Amount = 0;
            this.AmountText = string.Empty;
            this.AmountOk = false;
        }
 
        public override async Task OnDisposeAsync()
        {
            this.result?.TrySetResult(this.sellButtonPressed ? this.Amount : null);
 
            await base.OnDisposeAsync();
        }
 
        #region Properties
 
        [ObservableProperty]
        private decimal amount;
 
        [ObservableProperty]
        private bool amountOk;
 
        [ObservableProperty]
        private string? amountText;
 
        protected override void OnPropertyChanged(PropertyChangedEventArgs e)
        {
            base.OnPropertyChanged(e);
 
            switch (e.PropertyName)
            {
                case nameof(this.AmountText):
                    if (CommonTypes.TryParse(this.AmountText, out decimal d) && d > 0)
                    {
                        this.Amount = d;
                        this.AmountOk = true;
                    }
                    else
                    {
                        this.AmountOk = false;
                    }
                    break;
            }
        }
 
        [ObservableProperty]
        private string? currency;
 
        #endregion
 
        [RelayCommand]
        public async Task OpenCalculator(object Parameter)
        {
            try
            {
                switch (Parameter?.ToString())
                {
                    case "AmountText":
                        CalculatorNavigationArgs Args = new(this, nameof(this.AmountText));
 
                        await ServiceRef.NavigationService.GoToAsync(nameof(CalculatorPage), Args, BackMethod.Pop);
                        break;
                }
            }
            catch (Exception ex)
            {
                await ServiceRef.UiService.DisplayException(ex);
            }
        }
 
        [RelayCommand(CanExecute = nameof(AmountOk))]
        private async Task Sell()
        {
            this.sellButtonPressed = true;
            await this.GoBack();
        }
 
    }
}