linear-app-launcher/RyzStudio/Windows/ThemedForms/TListBox.cs

namespace RyzStudio.Windows.ThemedForms
{
    using RyzStudio.Drawing;
    using System;
	using System.ComponentModel;
	using System.Drawing;
    using System.Windows.Forms;

    public partial class TListBox : RyzStudio.Windows.ThemedForms.TUserControl
	{
        protected readonly Padding textboxPadding = new Padding(6, 2, 4, 2);

		public TListBox() : base()
        {
            InitializeComponent();

            this.Font = new Font(this.Font, FontStyle.Regular);
            this.Margin = new Padding(10, 4, 10, 4);

            comboBox1.Font = this.Font;
            comboBox1.DropDownStyle = ComboBoxStyle.DropDownList;
            comboBox1.PreviewKeyDown += textBox_PreviewKeyDown;
        }

        protected override void OnResize(EventArgs e)
        {
            base.OnResize(e);

            int b = (styleActive.BorderWidth + 1) + styleActive.BorderPadding;

            this.Height = comboBox1.Height + (b + textboxPadding.Top) + ((b - 1) + textboxPadding.Bottom);
        }

        protected override void OnGotFocus(EventArgs e)
        {
            base.OnGotFocus(e);

            comboBox1.Focus();
        }

        protected void textBox_PreviewKeyDown(object sender, PreviewKeyDownEventArgs e)
        {
            switch (e.KeyCode)
            {
                case Keys.Enter:
                    if (this.SubmitButton != null)
                    {
                        this.SubmitButton.PerformClick();
                    }

                    break;
                case Keys.Escape:
                    close();
                    break;
                default: break;
            }
        }

        [Browsable(true), EditorBrowsable(EditorBrowsableState.Advanced)]
        [Category("Appearance")]
        public System.Windows.Forms.ComboBox ComboBox { get => comboBox1; set => comboBox1 = value; }

        //[Browsable(true), EditorBrowsable(EditorBrowsableState.Advanced)]
        //[Category("Appearance")]
        //public new string Text
        //{
        //    get => textBox1.Text;
        //    set
        //    {
        //        textBox1.Text = value;
        //        textBox1.SelectionStart = textBox1.Text.Length;
        //    }
        //}

        //[Browsable(true)]
        //[Category("Appearance")]
        //public ComboBox.ObjectCollection Items { get => comboBox1.Items; set => comboBox1.Items = value; }

        [Browsable(true), EditorBrowsable(EditorBrowsableState.Advanced)]
        [Category("Appearance")]
        public TButton SubmitButton { get; set; } = null;

        [Browsable(false), EditorBrowsable(EditorBrowsableState.Never)]
        public new Padding Margin { get => base.Margin; set => base.Margin = value; }

        protected override void updateBackground(Graphics g, Style style)
        {
            int b = (styleActive.BorderWidth + 1) + styleActive.BorderPadding;

            this.Padding = new Padding((b + textboxPadding.Left), (b + textboxPadding.Top), ((b - 1) + textboxPadding.Right), ((b - 1) + textboxPadding.Bottom));

            Rectangoid area = new Rectangoid(this.ClientRectangle, style.BorderRadius, style.BorderWidth);
            g.FillPath(new SolidBrush(style.BackColour), area.ToGraphicsPath());
            g.DrawPath(new Pen(new SolidBrush(style.BorderColour), style.BorderWidth), area.ToGraphicsPath());
        }

    }
}