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);

			}

		}

	}

}