3rdpartylibs/fastreports.wpf/FastReport.Mono/Controls/ItemSelector.cs

using FastReport.Utils;
using System;
using System.Drawing;
using System.Windows.Forms;

namespace FastReport.Controls
{
    internal class ItemSelector : Control
    {
        public int ItemsCount { get; set; }

        public int ItemHeight { get; set; }

        public int SelectedIndex { get; set; }

        public Control Owner { get; }

        public event EventHandler ItemSelected;

        private void DrawHighlight(Graphics g, Rectangle rect)
        {
            using (Brush brush = new SolidBrush(Color.FromArgb(193, 210, 238)))
            using (Pen pen = new Pen(Color.FromArgb(49, 106, 197)))
            {
                g.FillRectangle(brush, rect);
                g.DrawRectangle(pen, rect);
            }
        }

        protected virtual void DrawItem(Graphics g, Rectangle rect, int index)
        {
        }

        protected override void OnPaint(PaintEventArgs e)
        {
            Graphics g = e.Graphics;

            int _3 = Owner.LogicalToDevice(3);
            int _6 = Owner.LogicalToDevice(6);
            int h = Owner.LogicalToDevice(ItemHeight);

            for (int i = 0; i < ItemsCount; i++)
            {
                Rectangle rect = new Rectangle(_3, i * h + _3, Width - _6, h);
                if (i == SelectedIndex)
                    DrawHighlight(g, rect);
                DrawItem(g, rect, i);
            }
        }

        protected override void OnMouseMove(MouseEventArgs e)
        {
            SelectedIndex = e.Y / Owner.LogicalToDevice(ItemHeight);
            Refresh();
        }

        protected override void OnMouseUp(MouseEventArgs e)
        {
            if (ItemSelected != null)
                ItemSelected(this, EventArgs.Empty);
        }

        public ItemSelector(Control owner)
        {
            Owner = owner;
            BackColor = Color.White;
            SetStyle(ControlStyles.AllPaintingInWmPaint | ControlStyles.OptimizedDoubleBuffer, true);
        }
    }
}