xenadmin/XenAdmin/Controls/VerticalTabs.cs

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using System;
using System.Windows.Forms;
using System.Drawing;
using System.Drawing.Drawing2D;
using XenAdmin.Core;


namespace XenAdmin.Controls
{
    public class VerticalTabs : FlickerFreeListBox
    {
        public interface IVerticalTab
        {
            string Text { get; }
            string SubText { get; }
            Image Image { get; }
        }
        public VerticalTabs()
        {
            IntegralHeight = false;
        }

        public override int ItemHeight => 40;
        public override DrawMode DrawMode => DrawMode.OwnerDrawFixed;

        public Func<Rectangle, Rectangle> AdjustItemTextBounds;

        private readonly Color TOP_COLOR = Color.FromArgb(101, 140, 244);
        private readonly Color BOTTOM_COLOR = Color.FromArgb(31, 102, 241);

        protected override void OnDrawItem(DrawItemEventArgs e)
        {
            if (e.Index < 0 || e.Index >= Items.Count)
                return;

            IVerticalTab editPage = Items[e.Index] as IVerticalTab;
            if (editPage == null)
                return;

            Graphics g = e.Graphics;
            Rectangle b = e.Bounds;

            if ((e.State & DrawItemState.Selected) > 0)
            {
                if (Application.RenderWithVisualStyles)
                {
                    using (LinearGradientBrush brush = new LinearGradientBrush(b, TOP_COLOR,
                        BOTTOM_COLOR, LinearGradientMode.Vertical))
                    {
                        //http://www.dotnetmonster.com/Uwe/Forum.aspx/dotnet-drawing/350/LinearGradientBrush-bug
                        brush.WrapMode = WrapMode.TileFlipX;
                        g.FillRectangle(brush, b);
                    }
                }
                else
                {
                    g.FillRectangle(SystemBrushes.Highlight, b);
                }
            }
            else
            {
                using (Brush brush = new SolidBrush(e.BackColor))
                {
                    g.FillRectangle(brush, b);
                }
            }

            Image icon = editPage.Image;
            if (icon != null)
            {
                g.DrawImage(icon, b.X + ((32 - icon.Width) / 2), 
                    b.Y + ((32 - icon.Height) / 2),
                    icon.Width, icon.Height);
            }

            if (AdjustItemTextBounds != null)
                b = AdjustItemTextBounds(b);

            int h = b.Height / 2;
            Rectangle topRect = new Rectangle(b.X + 32, b.Y, b.Width - 34, h - 1);
            Rectangle bottomRect = new Rectangle(b.X + 40, b.Y + h + 1, b.Width - 42, h - 1);

            Drawing.DrawText(g, editPage.Text, Program.DefaultFont, topRect,
                e.ForeColor, Color.Transparent, TextFormatFlags.SingleLine | TextFormatFlags.EndEllipsis | TextFormatFlags.Bottom);

            Color gray = (e.State & DrawItemState.Selected) > 0 ? e.ForeColor : Color.Gray;

            try
            {
                Drawing.DrawText(g, editPage.SubText, Program.DefaultFont, bottomRect,
                    gray, Color.Transparent, TextFormatFlags.SingleLine | TextFormatFlags.EndEllipsis | TextFormatFlags.Top);
            }
            catch
            {
                if (!DesignMode)
                    throw;
            }

            base.OnDrawItem(e);
        }
    }
}