A Custom Numeric UpDown Control

Introduction

This custom control is just a single file, CustomUpDown.cs (see code at the bottom of the article) which can easily be added to your project.

The source code including a demo project and a DumpImageToCode utility is available on GitHub at https://github.com/RickZeeland/WinForms_NumUpDown.

Tested with .NET 6 but should also work in .NET 4.8.
Based on Control, which is the most powerful way to create a Control, but not the easiest.
More information about different types of custom controls can be found at this link.

Background

The main reason for writing this custom control was layout problems experienced with the standard numeric UpDown control after converting complex forms from .NET 4.8 to .NET 6.

I also disliked the tiny buttons of the standard numeric UpDown control.

Using the Code

This control is just a single file that can easily be added to your Winforms project.

It functions mostly the same as the standard numeric UpDown control and also supports the ValueChanged event, example code from the demo Form1:

private void customUpDown1_ValueChanged(object sender, EventArgs e)
{
    var fontsize = (float)this.customUpDown1.Value;
    this.Font = new Font(this.Font.FontFamily, fontsize);
}

It also features:

• Optional label
• Repeat buttons
• Arrow or +- style
• Color properties for label, textbox and buttons

Note that the repeat button functionality is implemented without using a Timer.

Source Code

using System;
using System.ComponentModel;
using System.Diagnostics;
using System.Drawing;
using System.IO;
using System.Threading;
using System.Windows.Forms;

namespace WinForms_NumUpDown
{
    /// <summary>
    /// Custom Numeric UpDown Control.
    /// </summary>
    public class CustomUpDown : Control
    {
        public event EventHandler ValueChanged;

        [Category("CustomUpDown"), 
         Description("Gets or sets the default value in textBox"), 
         RefreshProperties(RefreshProperties.Repaint)]
        public decimal Value 
        {
            get
            {
                return valueLocal;
            }

            set
            {
                if (DecimalPlaces == 0)
                {
                    valueLocal = value;
                }
                else if (DecimalPlaces > 0 && DecimalPlaces < 7)  // Allow max 6 decimals
                {
                    valueLocal = Math.Round(value, DecimalPlaces);
                }

                Invalidate();
            }
        }

        [Category("CustomUpDown"), 
         Description("Gets or sets the decimal places (max 6)")]
        public int DecimalPlaces { get; set; } = 0;

        [Category("CustomUpDown"), Description("Gets or sets the increment value")]
        public decimal Increment { get; set; } = 1;

        [Category("CustomUpDown"), 
         Description("Gets or sets the Maximum value (max 25 significant digits)")]
        public decimal Maximum { get; set; } = 100;

        [Category("CustomUpDown"), Description("Gets or sets the Minimum value")]
        public decimal Minimum { get; set; } = 0;

        [Category("CustomUpDown"), 
         Description("Gets or sets the button repeat delay in milliseconds")]
        public int RepeatDelayMs { get; set; } = 100;

        [Category("CustomUpDown"), 
         Description("Gets or sets the button fore color"), 
         RefreshProperties(RefreshProperties.Repaint)]
        public Color ButtonForeColor
        {
            get { return buttonForeColor; }

            set
            {
                buttonForeColor = value;
                Invalidate();
            }
        }

        [Category("CustomUpDown"), 
         Description("Gets or sets the button back color"), 
         RefreshProperties(RefreshProperties.Repaint)]
        public Color ButtonBackColor
        {
            get { return buttonBackColor; }

            set
            {
                buttonBackColor = value;
                Invalidate();
            }
        }

        [Category("CustomUpDown"), 
         Description("Gets or sets the textbox back color (default White), 
         use ForeColor for the text color"), 
         RefreshProperties(RefreshProperties.Repaint)]
        public Color TextBackColor
        {
            get { return textBackColor; }

            set
            {
                textBackColor = value;
                Invalidate();
            }
        }

        public enum ButtonDisplay { Arrows, PlusMinus, PlusMinus2, PlusMinus3 };

        [Category("CustomUpDown"), 
         Description("Gets or sets the Button display style"), 
         RefreshProperties(RefreshProperties.Repaint)]
        public ButtonDisplay ButtonStyle
        {
            get { return buttonstyle; }

            set 
            { 
                buttonstyle = value;

                if (buttonstyle == ButtonDisplay.PlusMinus)
                {
                    // Simple text buttons
                    buttonUp.Text = "+";
                    buttonDown.Text = "-";
                    buttonUp.BackgroundImage = emptyIcon;
                    buttonDown.BackgroundImage = emptyIcon;
                }
                else if (buttonstyle == ButtonDisplay.PlusMinus2)
                {
                    // Buttons with icons
                    if (plus2Icon == null)
                    {
                        plus2Icon = GetImageFromHexString(plus2IconCode);
                    }

                    if (minus2Icon == null)
                    {
                        minus2Icon = GetImageFromHexString(minus2IconCode);
                    }

                    buttonUp.Text = "";
                    buttonDown.Text = "";
                    buttonUp.BackgroundImage = plus2Icon;
                    buttonUp.BackgroundImageLayout = ImageLayout.Zoom;
                    buttonDown.BackgroundImage = minus2Icon;
                    buttonDown.BackgroundImageLayout = ImageLayout.Zoom;
                }
                else if (buttonstyle == ButtonDisplay.PlusMinus3)
                {
                    // Buttons with icons
                    if (plus3Icon == null)
                    {
                        plus3Icon = GetImageFromHexString(plus3IconCode);
                    }

                    if (minus3Icon == null)
                    {
                        minus3Icon = GetImageFromHexString(minus3IconCode);
                    }

                    buttonUp.Text = "";
                    buttonDown.Text = "";
                    buttonUp.BackgroundImage = plus3Icon;
                    buttonUp.BackgroundImageLayout = ImageLayout.Zoom;
                    buttonDown.BackgroundImage = minus3Icon;
                    buttonDown.BackgroundImageLayout = ImageLayout.Zoom;
                }
                else
                {
                    // Standard Arrow buttons
                    buttonUp.Text = "▲";
                    buttonDown.Text = "▼";
                    buttonUp.BackgroundImage = emptyIcon;
                    buttonDown.BackgroundImage = emptyIcon;
                }

                Invalidate();
            }
        }

        [Category("CustomUpDown"), 
         Description("Gets or sets the optional label text 
         (with ForeColor as the color)"), 
         RefreshProperties(RefreshProperties.Repaint)]
        public new string Text
        {
            get { return base.Text; }

            set
            {
                if (!value.StartsWith("customUpDown")) // Ignore default designer text
                {
                    label1.Text = value;
                }

                base.Text = value;
                Invalidate();
            }
        }

        private ButtonDisplay buttonstyle;

        private Label label1;

        private bool label1Init;

        private TextBox textBox;

        private Button buttonUp;

        private Button buttonDown;

        private Color buttonForeColor;

        private Color buttonBackColor;

        private Color textBackColor;

        private decimal valueLocal;

        /// <summary>
        /// An empty Image (used when switching to a text style button)
        /// </summary>
        private Image emptyIcon;

        /// <summary>
        /// Code for plus2 icon generated by DumpImageToCode tool
        /// </summary>
        private string plus2IconCode = "89 50 4E 47 0D 0A 1A 0A 00 00 00 
        0D 49 48 44 52 00 00 00 1A 00 00 00 1A 08 06 00 00 00 A9 4A 4C CE 
        00 00 00 01 73 52 47 42 00 AE CE 1C E9 00 00 00 04 67 41 4D 41 00 
        00 B1 8F 0B FC 61 05 00 00 00 09 70 48 59 73 00 00 0E C3 00 00 0E 
        C3 01 C7 6F A8 64 00 00 00 58 49 44 41 54 48 4B ED 93 51 0A 00 21 
        08 44 BD FF C5 6A F7 52 E5 C2 06 11 1A 31 62 5F F3 E0 FD 88 3A 5F 
        23 E4 16 AF DA 7E EB 37 C8 62 84 0C D3 60 10 0C 83 5C E6 9E 44 DD 
        F6 CC 3A 88 E8 62 2D 47 74 79 54 EB 00 B1 A8 30 EB B3 34 18 04 C3 
        20 98 B9 67 A1 9E 90 43 44 3A 27 6F 8D BD 18 59 7F D5 00 00 00 00 
        49 45 4E 44 AE 42 60 82";

        private Image plus2Icon;

        /// <summary>
        /// Code for minus2 icon generated by DumpImageToCode tool
        /// </summary>
        private string minus2IconCode = "89 50 4E 47 0D 0A 1A 0A 00 00 00 
        0D 49 48 44 52 00 00 00 1A 00 00 00 1A 08 06 00 00 00 A9 4A 4C CE 
        00 00 00 01 73 52 47 42 00 AE CE 1C E9 00 00 00 04 67 41 4D 41 00 
        00 B1 8F 0B FC 61 05 00 00 00 09 70 48 59 73 00 00 0E C3 00 00 0E 
        C3 01 C7 6F A8 64 00 00 00 38 49 44 41 54 48 4B ED CB BB 0D 00 20 
        0C 03 D1 EC BF 18 9F A5 C0 03 38 0D 41 82 E2 9E 74 9D 1D 00 F0 8F 
        A9 D6 A5 BA 4A B9 43 A5 94 1B 57 4A 0D E5 0E 27 35 05 00 EF 45 6C 
        09 E6 4E D7 AD BA 2E B0 00 00 00 00 49 45 4E 44 AE 42 60 82";

        private Image minus2Icon;

        /// <summary>
        /// Code for plus3 icon generated by DumpImageToCode tool
        /// </summary>
        private string plus3IconCode = "89 50 4E 47 0D 0A 1A 0A 00 00 00 0D 
        49 48 44 52 00 00 00 28 00 00 00 28 08 06 00 00 00 8C FE B8 6D 00 00 
        00 01 73 52 47 42 00 AE CE 1C E9 00 00 00 04 67 41 4D 41 00 00 B1 8F 
        0B FC 61 05 00 00 00 09 70 48 59 73 00 00 0E C3 00 00 0E C3 01 C7 6F 
        A8 64 00 00 03 4B 49 44 41 54 58 47 ED 58 4D 6B DB 40 10 9D 9A D0 53 
        29 A5 84 D0 43 7E 41 E9 A9 07 53 7A 31 04 1F 7A F2 A1 C4 21 B6 64 FB 
        50 28 A5 90 D6 92 56 3E D6 35 39 04 D3 3F DD 79 33 3B D6 07 AA 22 3B 
        32 A8 E0 07 83 E4 DD 99 37 E3 9D D9 0F 2D 9D 70 C2 7F 86 9E 7F D2 98 
        BE BF 98 50 D4 0F 28 0A E7 E4 DC 8C E2 FB 39 25 5B 88 BE 3B 37 97 BE 
        A8 0F 5D 6F 06 EC 38 DA 04 48 85 38 A4 E4 22 A0 E5 0D 07 B0 59 50 FA 
        A7 89 40 37 A0 E4 06 B6 E0 60 EC F8 DA 80 10 0D 68 7D 16 50 3C 9A 53 
        BA CD 1C A7 DB 90 62 17 52 74 3B A5 E5 90 DF 3F 42 F0 CE 23 C9 01 C5 
        3C 8A 45 7D 70 BC A5 F1 73 61 6E 21 48 21 98 50 7C 0E 67 E6 68 46 8E 
        53 18 8F 16 E4 DE 88 56 0D A0 83 A0 60 93 05 1A 3B 70 7A 95 83 83 14 
        C3 80 EE 2E F3 E9 44 5D 71 DB 4B D1 F0 58 D3 BA 87 11 1E D0 C0 CB FA 
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        CF 92 DF 4A 88 F4 44 1F A4 57 01 9D 26 C4 05 3D 70 58 DA C1 5D AA CB 
        E6 18 73 9D F0 6C 8C 35 B8 84 6B 2D 79 87 76 3F 32 05 B2 09 7D 3D 67 
        9D EB BC A0 CD 77 1B 7A 36 AA E0 02 A7 04 C9 3E E0 4B 34 1A 42 48 50 
        37 20 80 D8 C8 21 7D 78 66 50 87 E8 D7 3F 92 F2 32 A3 A3 93 8D 76 31 
        D5 C6 61 36 AA 1B 8F A4 B3 E9 28 A2 B0 D9 D1 03 8C B9 B8 A7 DA 5A 74 
        E4 51 0E F0 C1 EC B2 00 AB 9C 2A D7 8C A2 A9 D9 35 99 70 3B 20 45 6A 
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        A8 7E 66 2B 90 27 7C C0 97 DA 47 7D E9 A9 03 6A 4E 03 74 B1 6F AA 81 
        3A 3B 34 C5 06 F8 F2 3E 7D BD D7 00 AB 3C 94 79 29 B8 D5 16 75 80 65 
        03 A3 02 C7 26 FA 7B F9 3E FB 53 89 88 39 43 5F 95 4D B6 8B 28 37 B6 
        4A D8 70 3D 3A 69 AE 83 15 2D 3B 18 E2 37 76 05 3C D9 F1 67 25 D1 11 
        3A 44 CC 16 5C 45 EE E5 50 FB DD 06 BF 6B C1 C6 15 35 94 9F D9 B2 94 
        48 2A 4D 6C D4 F2 82 B6 B2 1E 8B 2C 41 36 63 CB 35 0C DF F8 5D 8B CE 
        07 D8 F9 14 FF 7B 92 C8 91 AB 62 92 A4 35 93 24 6D 7F 92 64 CE 3A BB 
        CC 74 7C A1 C6 76 C3 CA DD DD EA 80 6C C6 1E F7 B0 B0 A0 9F AF 6C 52 
        DA CC 6E 84 E2 71 2B EA DC 71 CB 3B ED F0 81 15 D8 F7 C8 AF DF CA 7A 
        DC C7 7B EE AB CD 90 3B F2 FF 78 D2 91 1F F0 44 49 EB 1F 4D 73 5A F5 
        77 C1 31 37 7C F8 AE 26 5C 05 88 01 3E 0D AD 90 21 1C 64 27 3E 3B 0D 
        62 88 74 D9 0E 03 E1 05 F5 5E 6B 74 9F 0F F7 38 F7 E1 EE 5A F9 70 37 
        08 01 AE 2B E0 C8 26 81 3A D2 AB 0F 4E 19 EE 5D AE 16 52 F8 D8 CE 92 
        2B B4 61 87 28 EB 83 A3 CD AB 0F 03 88 84 0C 35 83 8B A0 7C DA 1F 13 
        4D E7 F1 2E 8F F2 D8 91 E2 4A 0D 5B 13 AE 42 78 14 57 48 3B 8A 1F 82 
        77 B4 71 60 72 FD F6 89 82 7C CD 1E 25 B0 13 4E 38 0E 88 FE 02 F6 44 
        9F 27 3E C7 F6 74 00 00 00 00 49 45 4E 44 AE 42 60 82";

        private Image plus3Icon;

        /// <summary>
        /// Code for minus3 icon generated by DumpImageToCode tool
        /// </summary>
        private string minus3IconCode = "89 50 4E 47 0D 0A 1A 0A 00 00 00 0D 
        49 48 44 52 00 00 00 28 00 00 00 28 08 06 00 00 00 8C FE B8 6D 00 00 
        00 01 73 52 47 42 00 AE CE 1C E9 00 00 00 04 67 41 4D 41 00 00 B1 8F 
        0B FC 61 05 00 00 00 09 70 48 59 73 00 00 0E C3 00 00 0E C3 01 C7 6F 
        A8 64 00 00 03 03 49 44 41 54 58 47 ED 98 4D 6B DB 40 10 86 A7 21 F4 
        54 4A 29 25 F4 90 5F 50 72 36 25 97 40 C8 A1 27 1F 4A 1C 92 F8 EB 50 
        28 A5 90 D6 92 D6 3E D6 35 39 04 D3 3F DD 79 66 77 2D CB 49 14 C5 96 
        A9 0A 7E 61 90 B4 9A 7D 67 76 77 66 47 5A D9 61 87 FF 0C 7B E1 2A 1D 
        F9 FE EA 4A 92 56 57 92 DE 40 9C EB 4B 7A 3B 90 6C 8E F8 7B E7 06 F6 
        2E 69 A1 1B BA 81 05 47 9D 80 D4 88 7B 92 1D 74 65 74 A1 0E CC 86 32 
        FE 53 45 D0 ED 4A 76 41 5F 38 14 0B BE 3A 60 44 27 32 DD EF 4A DA 1E 
        C8 78 9E 1B 1E CF 7B 92 BA 9E 24 97 D7 32 3A D3 FB 63 84 7B 9D 49 75 
        28 D5 59 2C EA C3 F1 41 3A 2F 8D B9 06 27 8D E0 4A D2 77 18 8B 86 FA 
        E2 74 09 D3 F6 50 DC 7B D3 2A 01 3A 38 45 9F DC D1 D4 C1 19 54 D6 76 
        D2 3A 76 E5 E6 70 79 39 89 2B 6D 7B 6D 1A 39 54 77 BA 22 45 C3 F4 21 
        5E 73 1E 96 7D 72 18 5E 17 74 AB C0 3A F4 E4 DB 41 FF 45 F6 DB 13 B2 
        3C C9 47 7B EB 71 CF 89 47 50 D0 83 23 2E 3B DC 2B 71 59 1D 1D 8D 13 
        CD C6 D4 3B 97 69 AC 65 47 B4 4F 1F 98 9D 8A D8 0B 7D 49 B4 23 38 CD 
        49 B5 81 2D D3 A8 08 23 21 6E 20 40 E2 CC 9D C8 C9 3E D7 4D 10 39 E0 
        CC F9 D3 B6 BD AC 3A 70 02 5B 97 E1 CE 8F D0 5D FB 56 3F FA 7A E0 B9 
        FA 92 5C 63 C3 DB 7A 3A E1 16 D0 E9 3F F7 1D DD EC 5C BE BC 0D CD B5 
        03 EE 98 80 D8 0C CD E5 20 DB 86 92 FD 5A 6B EA 9F 87 42 28 91 30 0F 
        EC 0E F7 41 F9 B2 0E 92 A9 83 37 2B DB 40 4C 10 AE EB 48 EC 6B B0 2B 
        36 B0 E5 67 31 69 D9 9B 32 10 73 DE 41 97 86 A6 AD 03 5B C1 66 88 F7 
        12 B0 CB A3 AC 5B C1 A5 6F F1 23 BE 92 AF 54 93 63 B2 6F 13 81 23 AF 
        22 9E 9B 52 E9 67 D0 39 6B 2E 43 0C 5A 1D CD 19 CF D4 60 AE BA 0C 9F 
        3D 49 5E 5B 9F 2B 8B 0D 5A B9 8A DC A3 33 FF DE CD 78 2E 85 76 36 12 
        46 CA 73 DC B7 F2 CC 1E DF 61 68 4D B1 AD 2B 66 6C E4 C6 56 70 7C CE 
        73 29 1A EF 60 E3 97 F8 F1 24 B1 4F AE 7F 9F 24 A4 BA 1F 65 63 B7 99 
        86 6F D4 94 1B 55 6E 6E A9 03 79 C6 6E F7 63 61 28 3F DF C4 A4 8C 99 
        5D 09 C5 CF AD A4 71 9F 5B 85 A9 47 C8 3E DA E2 BE B5 09 22 07 9C 39 
        FF 1A A1 B4 DD 4F FE 1F 1B 7D F2 83 40 94 D5 FE D3 34 90 49 6B E1 9C 
        72 63 23 BC AA C2 55 80 75 E0 D7 30 06 32 A2 4E 36 E2 B7 33 C2 3A B2 
        F3 C7 0A 83 E8 86 7A EB 63 F4 39 3F EE E9 D2 8F BB AB E5 C7 3D C2 08 
        38 AE C0 D0 72 2D E6 5E 4B 97 D3 25 E3 DC E5 74 68 81 4F 39 CB 4E 69 
        A3 42 AC EA C3 51 E7 D1 47 04 44 46 46 CC 70 10 B4 BC EC 4F 89 5F CE 
        ED 1D 1E 2D 63 41 CA 91 1A A5 89 A3 10 9D C5 09 CB 4E F0 23 DC D3 A6 
        8E D9 F1 DB 27 E9 2E C7 EC 56 1C DB 61 87 ED 40 E4 2F CA D3 30 3D C3 
        2A 06 23 00 00 00 00 49 45 4E 44 AE 42 60 82";

        private Image minus3Icon;

        ///// <summary>
        ///// Control height is determined by Font size.
        ///// </summary>
        //protected override void SetBoundsCore
        //(int x, int y, int width, int height, BoundsSpecified specified)
        //{
        //    Debug.Print($"Font Size = {Font.Size}  Height = {Font.Height}");
        //    height = Font.Height + 8;
        //    base.SetBoundsCore(x, y, width, height, specified);
        //}

        /// <summary>
        /// Clear the default designer Text / resize when user enters Text.
        /// </summary>
        /// <param name="e">The EventArgs</param>
        protected override void OnTextChanged(EventArgs e)
        {
            if (!string.IsNullOrEmpty(Text))
            {
                if (Text.StartsWith("customUpDown"))  // default designer Text
                {
                    Text = string.Empty;
                    label1Init = true;
                }
                else if (label1Init)                  // User entered Text for label1
                {
                    int buttonWidth = (int)(textBox.Height * 0.8);
                    Width = (int)(Text.Length * Font.Size + 
                             textBox.Width + 2 * buttonWidth);
                    label1Init = false;
                }
            }

            base.OnTextChanged(e);
        }

        /// <summary>
        /// Initializes a new instance of the <see cref="CustomUpDown"/> class.
        /// </summary>
        public CustomUpDown()
        {
            buttonForeColor = Color.Gray;
            textBackColor = Color.White;
            label1 = new Label();
            Controls.Add(label1);
            textBox = new TextBox();
            Value = Minimum;
            textBox.KeyPress += TextBox_KeyPress;
            Controls.Add(textBox);
            buttonUp = new Button();
            AddButtonUp();
            buttonDown = new Button();
            AddbuttonDown();
            buttonstyle = ButtonDisplay.Arrows;
            buttonUp.Text = "▲";
            buttonDown.Text = "▼";
        }

        /// <summary>
        /// Allow only digits, Enter and Backspace key.
        /// </summary>
        private void TextBox_KeyPress(object sender, KeyPressEventArgs e)
        {
            if (e.KeyChar == (char)Keys.Enter)
            {
                AddValue(0);
                e.Handled = false;
                ValueChanged?.Invoke(this, e);
            }
            else if (char.IsDigit(e.KeyChar) || e.KeyChar == (char)Keys.Back)
            {
                e.Handled = false;
            }
            else if (e.KeyChar == '.' || e.KeyChar == ',')
            {
                e.Handled = !(DecimalPlaces > 0);
            }
            else
            {
                e.Handled = true;
            }
        }

        private void AddButtonUp()
        {
            buttonUp.Name = "ButtonUp";
            buttonUp.FlatStyle = FlatStyle.Flat;
            buttonUp.FlatAppearance.BorderSize = 0;
            buttonUp.TextAlign = ContentAlignment.TopCenter;
            buttonUp.MouseDown += ButtonUpClick;
            Controls.Add(buttonUp);
        }

        private void AddbuttonDown()
        {
            buttonDown.Name = "buttonDown";
            buttonDown.FlatStyle = FlatStyle.Flat;
            buttonDown.FlatAppearance.BorderSize = 0;
            buttonDown.TextAlign = ContentAlignment.TopCenter;
            buttonDown.MouseDown += ButtonDownClick;
            Controls.Add(buttonDown);
        }

        /// <summary>
        /// Custom OnPaint() draws Label, TextBox and two Buttons.
        /// </summary>
        /// <param name="e">The PaintEventArgs</param>
        protected override void OnPaint(PaintEventArgs e)
        {
            textBox.Text = Value.ToString();
            textBox.BackColor = TextBackColor;
            textBox.ForeColor = ForeColor;
            int buttonHeight = textBox.Height;
            int buttonWidth = (int)(textBox.Height * 0.8);

            if (string.IsNullOrEmpty(label1.Text))
            {
                label1.Visible = false;
                textBox.Width = Width - 2 * buttonWidth;
                textBox.Location = new Point(0, 0);
            }
            else
            {
                label1.Visible = true;
                label1.BackColor = BackColor;
                textBox.Width = (int)(Math.Max(3, textBox.Text.Length) * Font.Size);
                label1.Width = Width - textBox.Width - 2 * buttonWidth;
                label1.Location = new Point(0, 2);
                textBox.Location = new Point(label1.Width, 0);
            }

            buttonUp.ForeColor = ButtonForeColor;
            buttonDown.ForeColor = ButtonForeColor;
            buttonUp.BackColor = ButtonBackColor;
            buttonDown.BackColor = ButtonBackColor;
            buttonUp.Size = new Size(buttonWidth, buttonHeight);
            buttonDown.Size = buttonUp.Size;
            buttonUp.Location = new Point(Width - 2 * buttonWidth, 0);
            buttonDown.Location = new Point(Width - buttonWidth, 0);
            base.OnPaint(e);
        }

        /// <summary>
        /// Button Up click, increment textBox value.
        /// Repeat when left button is kept pressed.
        /// </summary>
        /// <param name="sender">The sender.</param>
        /// <param name="e">The event args.</param>
        private void ButtonUpClick(object sender, MouseEventArgs e)
        {
            int delayMs = 300;      // Initial delay before repeating

            while ((MouseButtons & MouseButtons.Left) != 0)
            {
                if (AddValue(Increment))
                {
                    Application.DoEvents();
                    Thread.Sleep(delayMs);
                    delayMs = RepeatDelayMs;
                }

                Application.DoEvents();
            }

            ValueChanged?.Invoke(this, e);
        }

        /// <summary>
        /// Button Down click, decrement textBox value.
        /// Repeat when left button is kept pressed.
        /// </summary>
        /// <param name="sender">The sender.</param>
        /// <param name="e">The event args.</param>
        private void ButtonDownClick(object sender, MouseEventArgs e)
        {
            int delayMs = 300;

            while ((MouseButtons & MouseButtons.Left) != 0)
            {
                if (AddValue(-Increment))
                {
                    Application.DoEvents();
                    Thread.Sleep(delayMs);
                    delayMs = RepeatDelayMs;
                }

                Application.DoEvents();
            }

            ValueChanged?.Invoke(this, e);
        }

        /// <summary>
        /// Increment or decrement the TextBox value.
        /// </summary>
        /// <param name="value">The value</param>
        private bool AddValue(decimal value)
        {
            if (string.IsNullOrEmpty(textBox.Text))
            {

                Value = Minimum;
                textBox.Text = Value.ToString();
                return false;
            }
            else if (textBox.TextLength > 25)
            {
                Debug.Print("Too many significant digits for decimal");
                Value = Maximum;
                textBox.Text = Value.ToString();
                return false;
            }

            if (decimal.TryParse(textBox.Text, out var result))
            {
                Value = Math.Round(result + value, DecimalPlaces);

                if (Value < Minimum)
                {
                    Value = Minimum;
                }
                else if (Value > Maximum)
                {
                    Value = Maximum;
                }
                else
                {
                    textBox.Text = Value.ToString();
                    return true;
                }
            }

            textBox.Text = Value.ToString();
            return false;
        }

        /// <summary>
        /// Get an image from a string generated by the DumpImageToCode tool.
        /// </summary>
        /// <param name="hexString">The string with hex codes</param>
        /// <returns>An image</returns>
        private Image GetImageFromHexString(string hexString)
        {
            var hexArr = hexString.Split(' ');
            byte[] arr2 = new byte[hexArr.Length];

            for (int i = 0; i < hexArr.Length; i++)
            {
                arr2[i] = Convert.ToByte(hexArr[i], 16);
            }

            using (var ms2 = new MemoryStream(arr2))
            {
                return Image.FromStream(ms2);
            }
        }
    }
}

History

• 24^th January, 2023: Initial version