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using System;
using System.Collections.Generic;
using System.Drawing;
using System.Windows.Forms;

// Dragging items in a ListBox control with visual insertion guides
// http://www.cyotek.com/blog/dragging-items-in-a-listbox-control-with-visual-insertion-guides


namespace ListBoxInsertionDragDemo
{
  internal partial class DemoForm : Form
  {
    #region Instance Fields

    private List<Color> _colors;

    #endregion

    #region Public Constructors

    public DemoForm()
    {
      InitializeComponent();
    }

    #endregion

    #region Overridden Methods

    /// <summary>
    /// Raises the <see cref="E:System.Windows.Forms.Form.Load"/> event.
    /// </summary>
    /// <param name="e">An <see cref="T:System.EventArgs"/> that contains the event data. </param>
    protected override void OnLoad(EventArgs e)
    {
      base.OnLoad(e);

      _colors = new List<Color>(new[]
                                {
                                  Color.FromArgb(0, 48, 96), Color.FromArgb(47, 96, 144), Color.FromArgb(47, 96, 192), Color.FromArgb(0, 48, 144), Color.FromArgb(0, 0, 144), Color.FromArgb(0, 0, 207), Color.FromArgb(0, 0, 96), Color.FromArgb(0, 96, 96), Color.FromArgb(0, 96, 144), Color.FromArgb(0, 151, 192), Color.FromArgb(0, 103, 207), Color.FromArgb(0, 48, 207), Color.FromArgb(0, 0, 255), Color.FromArgb(48, 48, 255), Color.FromArgb(48, 48, 144), Color.FromArgb(96, 152, 144), Color.FromArgb(0, 152, 159), Color.FromArgb(48, 200, 207), Color.FromArgb(0, 200, 255), Color.FromArgb(0, 152, 255), Color.FromArgb(0, 103, 255), Color.FromArgb(48, 103, 255), Color.FromArgb(48, 48, 192), Color.FromArgb(96, 103, 144), Color.FromArgb(48, 152, 96), Color.FromArgb(0, 200, 144), Color.FromArgb(0, 200, 192), Color.FromArgb(0, 255, 255), Color.FromArgb(48, 200, 255), Color.FromArgb(48, 151, 255), Color.FromArgb(96, 151, 255), Color.FromArgb(96, 96, 255), Color.FromArgb(95, 0, 255), Color.FromArgb(96, 0, 192), Color.FromArgb(48, 151, 48), Color.FromArgb(0, 200, 96), Color.FromArgb(0, 255, 144), Color.FromArgb(96, 255, 207), Color.FromArgb(96, 255, 255), Color.FromArgb(96, 200, 255), Color.FromArgb(144, 200, 255), Color.FromArgb(144, 151, 255), Color.FromArgb(144, 103, 255), Color.FromArgb(144, 48, 255), Color.FromArgb(144, 0, 255), Color.FromArgb(0, 96, 0), Color.FromArgb(0, 200, 0), Color.FromArgb(0, 255, 0), Color.FromArgb(96, 255, 144), Color.FromArgb(144, 255, 192), Color.FromArgb(207, 255, 255), Color.FromArgb(192, 200, 255), Color.FromArgb(192, 151, 255), Color.FromArgb(192, 96, 255), Color.FromArgb(192, 48, 255), Color.FromArgb(192, 0, 255), Color.FromArgb(144, 0, 192), Color.FromArgb(0, 48, 0), Color.FromArgb(0, 152, 48), Color.FromArgb(47, 200, 47), Color.FromArgb(96, 255, 96), Color.FromArgb(144, 255, 144), Color.FromArgb(207, 255, 207), Color.FromArgb(255, 255, 255), Color.FromArgb(255, 200, 255), Color.FromArgb(255, 151, 255), Color.FromArgb(255, 104, 255), Color.FromArgb(255, 0, 255), Color.FromArgb(207, 0, 207), Color.FromArgb(96, 0, 96), Color.FromArgb(47, 96, 0), Color.FromArgb(0, 152, 0), Color.FromArgb(96, 255, 48), Color.FromArgb(144, 255, 96), Color.FromArgb(192, 255, 144), Color.FromArgb(255, 255, 207), Color.FromArgb(255, 200, 207), Color.FromArgb(255, 151, 207), Color.FromArgb(255, 96, 192), Color.FromArgb(255, 48, 207), Color.FromArgb(207, 0, 144), Color.FromArgb(144, 47, 144), Color.FromArgb(48, 48, 0), Color.FromArgb(96, 151, 0), Color.FromArgb(144, 255, 47), Color.FromArgb(207, 255, 96), Color.FromArgb(255, 255, 144), Color.FromArgb(255, 200, 144), Color.FromArgb(255, 152, 96), Color.FromArgb(255, 96, 144), Color.FromArgb(255, 48, 144), Color.FromArgb(207, 48, 144), Color.FromArgb(144, 0, 144), Color.FromArgb(96, 96, 47), Color.FromArgb(144, 200, 0), Color.FromArgb(192, 255, 57), Color.FromArgb(255, 255, 96), Color.FromArgb(255, 200, 96), Color.FromArgb(255, 152, 96), Color.FromArgb(255, 96, 96), Color.FromArgb(255, 0, 96), Color.FromArgb(207, 103, 144), Color.FromArgb(144, 48, 96), Color.FromArgb(144, 151, 96), Color.FromArgb(192, 200, 0), Color.FromArgb(255, 255, 0), Color.FromArgb(255, 200, 0), Color.FromArgb(255, 151, 47), Color.FromArgb(255, 103, 0), Color.FromArgb(255, 96, 96), Color.FromArgb(192, 0, 95), Color.FromArgb(96, 0, 47), Color.FromArgb(159, 103, 48), Color.FromArgb(207, 151, 0), Color.FromArgb(255, 151, 0), Color.FromArgb(192, 96, 0), Color.FromArgb(255, 48, 0), Color.FromArgb(255, 0, 0), Color.FromArgb(192, 0, 0), Color.FromArgb(144, 0, 47), Color.FromArgb(96, 48, 0), Color.FromArgb(144, 96, 0), Color.FromArgb(192, 48, 0), Color.FromArgb(144, 48, 0), Color.FromArgb(144, 0, 0), Color.FromArgb(127, 0, 0), Color.FromArgb(144, 48, 48), Color.White, Color.Black, Color.FromArgb(207, 200, 207), Color.FromArgb(144, 151, 144), Color.FromArgb(96, 103, 96), Color.FromArgb(192, 192, 192), Color.FromArgb(127, 127, 127), Color.FromArgb(48, 48, 48)
                                });
      this.GenerateItems();
    }

    #endregion

    #region Private Members

    private void GenerateItems()
    {
      for (int i = 0; i < _colors.Count; i++)
      {
        listBox.Items.Add(new ListBoxItem
                          {
                            ImageIndex = i,
                            Color = _colors[i]
                          });
      }
    }

    #endregion

    #region Event Handlers

    private void allowItemDragCheckBox_CheckedChanged(object sender, EventArgs e)
    {
      listBox.AllowItemDrag = allowItemDragCheckBox.Checked;
    }

    private void listBox_DrawItem(object sender, DrawItemEventArgs e)
    {
      e.DrawBackground();
      e.DrawFocusRectangle();

      if (e.Index != -1)
      {
        ListBoxItem item;
        Rectangle imageBounds;
        Rectangle textBounds;

        item = (ListBoxItem)listBox.Items[e.Index];
        imageBounds = new Rectangle(e.Bounds.Left + 2, e.Bounds.Top + 2, e.Bounds.Height - 5, e.Bounds.Height - 5);
        textBounds = new Rectangle(imageBounds.Right + 6, imageBounds.Top, e.Bounds.Width - (imageBounds.Right + 10), imageBounds.Height);

        using (Brush brush = new SolidBrush(item.Color))
        {
          e.Graphics.FillRectangle(brush, imageBounds);
        }
        e.Graphics.DrawRectangle(SystemPens.WindowText, imageBounds);

        TextRenderer.DrawText(e.Graphics, item.ToString(), listBox.Font, textBounds, e.ForeColor, TextFormatFlags.ExpandTabs | TextFormatFlags.EndEllipsis | TextFormatFlags.NoPadding | TextFormatFlags.NoPrefix | TextFormatFlags.SingleLine | TextFormatFlags.VerticalCenter);
      }
    }

    private void listBox_ItemDrag(object sender, ListBoxItemDragEventArgs e)
    {
      eventsListBox.AddEvent((Control)sender, "ItemDrag", e);
    }

    private void listBox_ItemDragging(object sender, CancelListBoxItemDragEventArgs e)
    {
      eventsListBox.AddEvent((Control)sender, "ItemDragging", e);
    }

    private void ownerdrawCheckBox_CheckedChanged(object sender, EventArgs e)
    {
      listBox.DrawMode = ownerdrawCheckBox.Checked ? DrawMode.OwnerDrawFixed : DrawMode.Normal;
    }

    #endregion
  }
}