optimizer/Optimizer/Controls/MoonComboBox.cs

//using System;
//using System.Drawing;
//using System.Drawing.Drawing2D;
//using System.Runtime.InteropServices;
//using System.Windows.Forms;

//namespace Optimizer
//{
//    public sealed class MoonComboBox : ComboBox
//    {
//        [DllImport("user32.dll")]
//        static extern IntPtr GetDC(IntPtr ptr);
//        [DllImport("gdi32.dll")]
//        static extern int GetDeviceCaps(IntPtr hdc, int nIndex);
//        [DllImport("user32.dll", EntryPoint = "ReleaseDC")]
//        static extern IntPtr ReleaseDC(IntPtr hWnd, IntPtr hDc);

//        private Color _color = Color.FromArgb(40, 40, 40);
//        private Color _selectedItemColor = Color.FromArgb(40, 40, 40);
//        private Color _borderColor = Color.FromArgb(61, 61, 61);
//        private Color _separatorLineColor = Color.FromArgb(61, 61, 61);

//        public Color SelectColor
//        {
//            get => _selectedItemColor;
//            set
//            {
//                _selectedItemColor = value;
//                Invalidate();
//            }
//        }

//        protected override void OnDrawItem(DrawItemEventArgs e)
//        {
//            base.OnDrawItem(e);
//            LinearGradientBrush LGB = new LinearGradientBrush(e.Bounds, _selectedItemColor, ColorHelper.ChangeColorBrightness(_selectedItemColor, 0.7), 90.0F);

//            if (Convert.ToInt32(e.State & DrawItemState.Selected) == (int)DrawItemState.Selected)
//            {
//                if (!(e.Index == -1))
//                {
//                    e.Graphics.FillRectangle(LGB, e.Bounds);
//                    e.Graphics.DrawString(GetItemText(Items[e.Index]), e.Font, new SolidBrush(GetContrastColor(SelectColor)), e.Bounds);
//                }
//            }
//            else
//            {
//                if (!(e.Index == -1))
//                {
//                    e.Graphics.FillRectangle(new SolidBrush(Color.FromArgb(40, 40, 40)), e.Bounds);
//                    e.Graphics.DrawString(GetItemText(Items[e.Index]), e.Font, Brushes.DimGray, e.Bounds);
//                }
//            }
//            LGB.Dispose();
//        }

//        protected override void OnLostFocus(EventArgs e)
//        {
//            base.OnLostFocus(e);
//            SuspendLayout();
//            Update();
//            ResumeLayout();
//        }

//        protected override void OnPaintBackground(PaintEventArgs e)
//        {
//            base.OnPaintBackground(e);
//        }

//        protected override void OnResize(EventArgs e)
//        {
//            base.OnResize(e);
//            if (!Focused)
//            {
//                SelectionLength = 0;
//            }
//        }

//        private static int DPIScale
//        {
//            get
//            {
//                IntPtr hdc = GetDC(IntPtr.Zero);
//                int DC = GetDeviceCaps(hdc, 0x58);
//                ReleaseDC(IntPtr.Zero, hdc);
//                return DC;
//            }
//        }

//        private int GetDPIScaleFactor(int currentDPI)
//        {
//            switch (currentDPI)
//            {
//                case 96:
//                    return 25;
//                case 120:
//                    return 30;
//                case 144:
//                    return 35;
//                case 192:
//                    return 40;
//                default:
//                    return 25;
//            }
//        }

//        protected override void OnDropDown(EventArgs e)
//        {
//            base.OnDropDown(e);

//            DropDownHeight = Items.Count * GetDPIScaleFactor(DPIScale);
//        }

//        public MoonComboBox()
//        {
//            SetStyle((ControlStyles)0x22016, true);
//            SetStyle(ControlStyles.Selectable, false);

//            DrawMode = DrawMode.OwnerDrawFixed;
//            DropDownStyle = ComboBoxStyle.DropDownList;

//            BackColor = Color.FromArgb(246, 246, 246);
//            ForeColor = Color.FromArgb(76, 76, 97);
//            Size = new Size(135, 27);
//            Cursor = Cursors.Hand;
//        }

//        private GraphicsPath GetFigurePath(Rectangle rect, int radius)
//        {
//            GraphicsPath path = new GraphicsPath();
//            float curveSize = radius * 2F;

//            path.StartFigure();
//            path.AddArc(rect.X, rect.Y, curveSize, curveSize, 180, 90);
//            path.AddArc(rect.Right - curveSize, rect.Y, curveSize, curveSize, 270, 90);
//            path.AddArc(rect.Right - curveSize, rect.Bottom - curveSize, curveSize, curveSize, 0, 90);
//            path.AddArc(rect.X, rect.Bottom - curveSize, curveSize, curveSize, 90, 90);
//            path.CloseFigure();

//            return path;
//        }

//        private Color GetContrastColor(Color c)
//        {
//            double brightness = c.R * 0.299 + c.G * 0.587 + c.B * 0.114;
//            return brightness > 149 ? Color.Black : Color.White;
//        }

//        public enum Direction
//        {
//            Up, Down
//        }

//        private void DrawTriangle(Graphics g, Rectangle rect, Direction direction)
//        {
//            int halfWidth = rect.Width / 2;
//            Point p0 = Point.Empty;
//            Point p1 = Point.Empty;
//            Point p2 = Point.Empty;

//            switch (direction)
//            {
//                case Direction.Up:
//                    p0 = new Point(rect.Left + halfWidth, rect.Top);
//                    p1 = new Point(rect.Left, rect.Bottom);
//                    p2 = new Point(rect.Right, rect.Bottom);
//                    break;
//                case Direction.Down:
//                    p0 = new Point(rect.Left + halfWidth, rect.Bottom);
//                    p1 = new Point(rect.Left, rect.Top);
//                    p2 = new Point(rect.Right, rect.Top);
//                    break;
//            }

//            g.FillPolygon(Brushes.DarkGray, new Point[] { p0, p1, p2 });
//        }

//        protected override void OnPaint(PaintEventArgs e)
//        {
//            base.OnPaint(e);

//            e.Graphics.SmoothingMode = SmoothingMode.AntiAlias;
//            e.Graphics.PixelOffsetMode = PixelOffsetMode.HighQuality;
//            e.Graphics.InterpolationMode = InterpolationMode.High;

//            e.Graphics.Clear(Parent.BackColor);

//            var rect = new Rectangle(0, 0, Width - 1, Height - 1);

//            GraphicsPath GP = GetFigurePath(rect, 5);

//            LinearGradientBrush LGB = new LinearGradientBrush(ClientRectangle, _color, ColorHelper.ChangeColorBrightness(_color, 0.8), 90.0F);

//            e.Graphics.SetClip(GP);
//            e.Graphics.FillRectangle(LGB, ClientRectangle);
//            e.Graphics.ResetClip();

//            e.Graphics.DrawPath(new Pen(_borderColor), GP);

//            e.Graphics.DrawString(Text, Font, new SolidBrush(ForeColor), new Rectangle(3, 0, Width - 20, Height), new StringFormat
//            {
//                LineAlignment = StringAlignment.Center,
//                Alignment = StringAlignment.Near
//            });

//            DrawTriangle(e.Graphics, new Rectangle(Width - 17, (Height / 2) - 4, 8, 8), DroppedDown ? Direction.Up : Direction.Down);

//            e.Graphics.DrawLine(new Pen(ColorHelper.ChangeColorBrightness(_separatorLineColor, 0.8)), Width - 24, 5, Width - 24, Height - 6);
//            e.Graphics.DrawLine(new Pen(_separatorLineColor), Width - 25, 5, Width - 25, Height - 6);
//        }
//    }
//}