bluflame/intromat/Intromat/ViewModels/Editors/FloatExpressionEditorViewModel.cs

using System;
using Intromat.Nodes.Code;
using Intromat.Views.Editors;
using ReactiveUI;
using Splat;

namespace Intromat.ViewModels.Editors
{
    public class FloatExpressionEditorViewModel : ExpressionEditorBaseViewModel<float, FloatLiteralValue, FloatLiteralModel>
    {
        private float _maxValue;
        private float _minValue;

        static FloatExpressionEditorViewModel()
        {
            Locator.CurrentMutable.Register(() => new FloatExpressionEditorView(), typeof(IViewFor<FloatExpressionEditorViewModel>));
        }

        public FloatExpressionEditorViewModel()
        {
            this.WhenAnyValue(vm => vm.Value)
                .Subscribe(t =>
                {
                    var newValue = t!.Evaluate();
                    if (newValue > MaxValue)
                    {
                        var delta = newValue - MinValue;
                        MaxValue = newValue + delta;
                    }
                    else if (newValue < MinValue)
                    {
                        var delta = MaxValue - newValue;
                        MinValue = newValue - delta;
                    }
                });
        }

        public float MinValue
        {
            get => _minValue;
            set => this.RaiseAndSetIfChanged(ref _minValue, value);
        }

        public float MaxValue
        {
            get => _maxValue;
            set => this.RaiseAndSetIfChanged(ref _maxValue, value);
        }
    }
}