annotations/Azaion.Common/Controls/NumericUpDown.xaml.cs

using System.Globalization;
using System.Windows;
using System.Windows.Controls;

namespace Azaion.Common.Controls;

public partial class NumericUpDown : UserControl
{
    public static readonly DependencyProperty MinValueProperty = DependencyProperty.Register(
        nameof(MinValue), typeof(decimal), typeof(NumericUpDown), new PropertyMetadata(0m));

    public static readonly DependencyProperty MaxValueProperty = DependencyProperty.Register(
        nameof(MaxValue), typeof(decimal), typeof(NumericUpDown), new PropertyMetadata(100m));

    public static readonly DependencyProperty ValueProperty = DependencyProperty.Register(
        nameof(Value), typeof(decimal), typeof(NumericUpDown), new PropertyMetadata(10m, OnValueChanged));

    public static readonly DependencyProperty StepProperty = DependencyProperty.Register(
        nameof(Step), typeof(decimal), typeof(NumericUpDown), new PropertyMetadata(1m));

    public decimal MinValue
    {
        get => (decimal)GetValue(MinValueProperty);
        set => SetValue(MinValueProperty, value);
    }

    public decimal MaxValue
    {
        get => (decimal)GetValue(MaxValueProperty);
        set => SetValue(MaxValueProperty, value);
    }

    public decimal Value
    {
        get => (decimal)GetValue(ValueProperty);
        set => SetValue(ValueProperty, value);
    }

    public decimal Step
    {
        get => (decimal)GetValue(StepProperty);
        set => SetValue(StepProperty, value);
    }

    public NumericUpDown()
    {
        InitializeComponent();
    }

    private static void OnValueChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        if (d is not NumericUpDown control)
            return;

        control.NudTextBox.Text = ((decimal)e.NewValue).ToString(CultureInfo.InvariantCulture);
        control.NudTextBox.SelectionStart = control.NudTextBox.Text.Length;
    }

    private void NudButtonUp_OnClick(object sender, RoutedEventArgs e)
    {
        var step = Step <= 0 ? 1m : Step;
        var newVal = Math.Min(MaxValue, Value + step);
        Value = newVal;
        NudTextBox.Text = Value.ToString(CultureInfo.InvariantCulture);
        NudTextBox.SelectionStart = NudTextBox.Text.Length;
    }

    private void NudButtonDown_OnClick(object sender, RoutedEventArgs e)
    {
        var step = Step <= 0 ? 1m : Step;
        var newVal = Math.Max(MinValue, Value - step);
        Value = newVal;
        NudTextBox.Text = Value.ToString(CultureInfo.InvariantCulture);
        NudTextBox.SelectionStart = NudTextBox.Text.Length;
    }

    private void NudTextBox_OnLostFocus(object sender, RoutedEventArgs e)
    {
        if (string.IsNullOrEmpty(NudTextBox.Text) || !decimal.TryParse(NudTextBox.Text, NumberStyles.Any, CultureInfo.InvariantCulture, out var number))
        {
            NudTextBox.Text = Value.ToString(CultureInfo.InvariantCulture);
            return;
        }
        if (number > MaxValue )
        {
            Value = MaxValue;
            NudTextBox.Text = MaxValue.ToString(CultureInfo.InvariantCulture);
        }
        else if (number < MinValue)
        {
            Value = MinValue;
            NudTextBox.Text = Value.ToString(CultureInfo.InvariantCulture);
        }
        else
        {
            Value = number;
        }

        NudTextBox.SelectionStart = NudTextBox.Text.Length;
    }
}