using System;

 using System.Collections.Generic;

 using System.Text;

 using System.Drawing;

 using System.Windows.Forms;

 namespace Aga.Controls.Tree

 {

 	internal class ReorderColumnState : ColumnState

 	{

 		#region Properties

 		private Point _location;

 		public Point Location

 		{

 			get { return _location; }

 		}

 		private Bitmap _ghostImage;

 		public Bitmap GhostImage

 		{

 			get { return _ghostImage; }

 		}

 		private TreeColumn _dropColumn;

 		public TreeColumn DropColumn

 		{

 			get { return _dropColumn; }

 		}

 		private int _dragOffset;

 		public int DragOffset

 		{

 			get { return _dragOffset; }

 		}

 		#endregion

 		public ReorderColumnState(TreeViewAdv tree, TreeColumn column, Point initialMouseLocation)

 			: base(tree, column)

 		{

 			_location = new Point(initialMouseLocation.X + Tree.OffsetX, 0);

 			_dragOffset = tree.GetColumnX(column) - initialMouseLocation.X;

 			_ghostImage = column.CreateGhostImage(new Rectangle(0, 0, column.Width, tree.ColumnHeaderHeight), tree.Font);

 		}

 		public override void KeyDown(KeyEventArgs args)

 		{

 			args.Handled = true;

 			if (args.KeyCode == Keys.Escape)

 				FinishResize();

 		}

 		public override void MouseDown(TreeNodeAdvMouseEventArgs args)

 		{

 		}

 		public override void MouseUp(TreeNodeAdvMouseEventArgs args)

 		{

 			FinishResize();

 		}

 		public override bool MouseMove(MouseEventArgs args)

 		{

 			_dropColumn = null;

 			_location = new Point(args.X + Tree.OffsetX, 0);

 			int x = 0;

 			foreach (TreeColumn c in Tree.Columns)

 			{

 				if (c.IsVisible)

 				{

 					if (_location.X < x + c.Width / 2)

 					{

 						_dropColumn = c;

 						break;

 					}

 					x += c.Width;

 				}

 			}

 			Tree.UpdateHeaders();

 			return true;

 		}

 		private void FinishResize()

 		{

 			Tree.ChangeInput();

 			if (Column == DropColumn)

 				Tree.UpdateView();

 			else

 			{

 				Tree.Columns.Remove(Column);

 				if (DropColumn == null)

 					Tree.Columns.Add(Column);

 				else

 					Tree.Columns.Insert(Tree.Columns.IndexOf(DropColumn), Column);

 				Tree.OnColumnReordered(Column);

 			}

 		}

 	}

 }