inabox/InABox.Avalonia/Dialogs/DoubleDialog/DoubleDialogViewModel.cs

using Avalonia.Layout;
using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;

namespace InABox.Avalonia.Dialogs;

public partial class DoubleDialogViewModel : BasePopupViewModel<double?>, IAlignedPopup
{
    
    public HorizontalAlignment HorizontalAlignment => HorizontalAlignment.Stretch;

    public VerticalAlignment VerticalAlignment => VerticalAlignment.Center;
    
    [ObservableProperty]
    private string _title = "";
    
    [ObservableProperty] 
    private string? _text;
    
    [ObservableProperty] 
    private double? _value;
    
    public override Task Activate()
    {   
        Text = Value is null ? "" : $"{Value}";
        return base.Activate();
    }

    [RelayCommand]
    private void Cancel()
    {
        Close(null);
    }

    [RelayCommand]
    private void Ok()
    {
        Value = Double.TryParse(Text, out var _v) ? _v : 0.0;
        Close(Value);
    }

    [RelayCommand]
    private void KeyPressed(object value)
    {
        Text = $"{Text}{value}";
    }

    [RelayCommand]
    private void NegativePressed(object value)
    {
        Text = Text?.StartsWith("-") == true 
            ? Text.Substring(1) 
            : $"-{Text}";
    }
    
    [RelayCommand]
    private void DecimalPressed(object value)
    {
        if (string.IsNullOrWhiteSpace(Text))
            Text = "0.";
        else if (!Text.Contains('.'))
            Text = $"{Text}.";
    }
    
    [RelayCommand]
    private void BackPressed(object value)
    {
        Text = string.IsNullOrWhiteSpace(Text)
            ? ""
            : Text.Remove(Text.Length - 1);
    }


}