BuyEDalerViewModel.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.BuyEDaler
{
    public partial class BuyEDalerViewModel : XmppViewModel
    {
        private readonly TaskCompletionSource<decimal?>? result;
        private bool buyButtonPressed = false;
 
        public BuyEDalerViewModel(BuyEDalerNavigationArgs? Args)
            : base()
        {
            this.Currency = Args?.Currency;
            this.result = Args?.Result;
            this.Amount = 0;
            this.AmountText = string.Empty;
            this.AmountOk = false;
        }
 
        protected override async Task OnDispose()
        {
            this.result?.TrySetResult(this.buyButtonPressed ? this.Amount : null);
 
            await base.OnDispose();
        }
 
        partial void OnAmountTextChanged(string? value)
        {
            if (CommonTypes.TryParse(this.AmountText, out decimal d) && d > 0)
            {
                this.Amount = d;
                this.AmountOk = true;
            }
            else
                this.AmountOk = false;
        }
 
        #region Properties
 
        [ObservableProperty]
        private decimal amount;
 
        [ObservableProperty]
        [NotifyPropertyChangedFor(nameof(this.AmountEntryValid))]
        [NotifyCanExecuteChangedFor(nameof(BuyCommand))]
        private bool amountOk;
 
        [ObservableProperty]
        private string? amountText;
 
        public bool AmountEntryValid => this.AmountOk || string.IsNullOrEmpty(this.AmountText);
 
        [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.UiService.GoToAsync(nameof(CalculatorPage), Args, BackMethod.Pop);
                        break;
                }
            }
            catch (Exception ex)
            {
                await ServiceRef.UiService.DisplayException(ex);
            }
        }
 
        [RelayCommand(CanExecute = nameof(AmountOk))]
        private async Task Buy()
        {
            this.buyButtonPressed = true;
            await this.GoBack();
        }
 
    }
}