prs/PRS.Avalonia/PRS.Avalonia/Components/FormsEditor/Fields/DFIntegerFieldControl.cs

using Avalonia.Controls;
using Avalonia.Input;
using Avalonia.Interactivity;
using Avalonia.Layout;
using Avalonia.Media;
using InABox.Avalonia.Components;
using InABox.Core;
using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace PRS.Avalonia.DigitalForms;

class DFIntegerFieldControl : DigitalFormFieldControl<DFLayoutIntegerField, DFLayoutIntegerFieldProperties, int, int?>
{
    private IntegerBox Integer = null!; // late-initialising

    protected override Control Create()
    {
        Integer = new IntegerBox();
        Integer.Value = Field.Properties.Default;
        Integer.HorizontalContentAlignment = HorizontalAlignment.Center;
        Integer.VerticalContentAlignment = VerticalAlignment.Center;
        Integer.VerticalAlignment = VerticalAlignment.Stretch;
        Integer.ValueChanged += (sender, e) => ChangeField();

        return Integer;
    }

    public override int? GetSerializedValue()
    {
        var value = Integer.Value;
        if (value != null)
            return Convert.ToInt32(value);
        return null;
    }

    public override void SetSerializedValue(int? value)
    {
        Integer.Value = value;
    }

    public override int GetValue()
    {
        var value = Integer.Value;
        if (value != null)
            return Convert.ToInt32(value);
        return 0;
    }

    public override void SetValue(int value)
    {
        Integer.Value = value;
    }
    protected override bool IsEmpty() => Integer.Value == null;

    public override void SetBackground(IBrush brush, bool defaultColour)
    {
        Integer.Background = brush;
    }
}