// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
// Copyright (c) 2005 Novell, Inc. (http://www.novell.com)
//
// Author:
//	Jordi Mas i Hernandez <jordi@ximian.com>
//
//

// NOT COMPLETE


using System;
using System.ComponentModel;
using System.Drawing;
using System.Runtime.InteropServices;
using System.Collections;

namespace System.Windows.Forms
{
	[DefaultEvent("Navigate")]
	[DefaultProperty("DataSource")]
	[Designer("System.Windows.Forms.Design.DataGridDesigner, " + Consts.AssemblySystem_Design, "System.ComponentModel.Design.IDesigner")]
	public class DataGrid : Control, ISupportInitialize, IDataGridEditingService
	{
		[Flags]
		[Serializable]
		public enum HitTestType
		{
			None		= 0,
			Cell		= 1,
			ColumnHeader	= 2,
			RowHeader	= 4,
			ColumnResize	= 8,
			RowResize	= 16,
			Caption		= 32,
			ParentRows	= 64
		}

		public sealed class HitTestInfo
		{
			public static readonly HitTestInfo Nowhere = null;

			#region	Local Variables
			internal int column;
			internal int row;
			internal HitTestType type;
			#endregion // Local Variables

			#region Private Constructors
			internal HitTestInfo ()
			{
				column = 0;
				row = 0;
				type =  HitTestType.None;
			}
			#endregion


			#region Public Instance Properties
			public int Column {
				get { return column; }
			}

			public int Row {
				get { return row; }
			}
			public DataGrid.HitTestType Type {
				get { return type; }
			}
			#endregion //Public Instance Properties

			public override bool Equals (object o)
			{
				if (!(o is HitTestInfo))
					return false;

				HitTestInfo obj = (HitTestInfo) o;
				return (obj.Column == column && obj.Row == row && obj.Type ==type);
			}

			public override int GetHashCode ()
			{
				return row ^ column;
			}

			public override string ToString ()
			{
				return base.ToString ();
			}

		}

		#region	Local Variables
		private static readonly Color	def_alternating_backcolor = ThemeEngine.Current.DataGridAlternatingBackColor;
		private static readonly Color	def_background_color = ThemeEngine.Current.DataGridBackgroundColor;
		private static readonly Color	def_caption_backcolor = ThemeEngine.Current.DataGridCaptionBackColor;
		private static readonly Color	def_caption_forecolor = ThemeEngine.Current.DataGridCaptionForeColor;
		private static readonly Color	def_gridline_color = ThemeEngine.Current.DataGridGridLineColor;
		private static readonly Color	def_header_backcolor = ThemeEngine.Current.DataGridHeaderBackColor;
		private static readonly Font	def_header_font = ThemeEngine.Current.DefaultFont;
		private static readonly Color	def_header_forecolor = ThemeEngine.Current.DataGridHeaderForeColor;
		private static readonly Color	def_link_hovercolor = ThemeEngine.Current.DataGridLinkHoverColor;
		private static readonly Color	def_parentrowsback_color = ThemeEngine.Current.DataGridParentRowsBackColor;
		private static readonly Color	def_parentrowsfore_color = ThemeEngine.Current.DataGridParentRowsForeColor;
		private static readonly Color	def_selection_backcolor = ThemeEngine.Current.DataGridSelectionBackColor;
		private static readonly Color	def_selection_forecolor = ThemeEngine.Current.DataGridSelectionForeColor;
		private static readonly Color	def_link_color = ThemeEngine.Current.DataGridLinkColor;
		internal readonly int def_preferredrow_height;

		private bool allow_navigation;
		private bool allow_sorting;
		private Color alternating_backcolor;
		private Color backColor;
		private Color background_color;
		internal BorderStyle border_style;
		private Color caption_backcolor;
		private Font caption_font;
		private Color caption_forecolor;
		private string caption_text;
		internal bool caption_visible;
		internal bool columnheaders_visible;
		private object datasource;
		private object real_datasource;
		private string datamember;
		private int firstvisible_column;
		private bool flatmode;
		private Color gridline_color;
		private DataGridLineStyle gridline_style;
		private Color header_backcolor;
		private Color header_forecolor;
		private Font header_font;
		private Color link_color;
		private Color link_hovercolor;
		private Color parentrowsback_color;
		private Color parentrowsfore_color;
		private bool parentrows_visible;
		private int preferredcolumn_width;
		private int preferredrow_height;
		private bool _readonly;
		internal bool rowheaders_visible;
		private Color selection_backcolor;
		private Color selection_forecolor;
		private int rowheaders_width;
		internal int visiblecolumn_count;
		internal int visiblerow_count;
		internal int first_visiblecolumn;
		private GridTableStylesCollection styles_collection;
		private DataGridParentRowsLabelStyle parentrowslabel_style;
		internal DataGridCell current_cell;
		private DataGridTableStyle default_style;
		private DataGridTableStyle current_style;
		internal HScrollBar horiz_scrollbar;
		internal VScrollBar vert_scrollbar;
		internal DataGridDrawing grid_drawing;
		internal int first_visiblerow;
		internal int horz_pixeloffset;
		internal bool is_editing; 	// Current cell is edit mode
		internal bool is_changing;	// Indicates if current cell is been changed (in edit mode)
		internal bool is_adding;	// Indicates when we are adding a row
		private Hashtable selected_rows;
		private bool ctrl_pressed;
		private bool shift_pressed;
		private bool begininit;
		private CurrencyManager cached_currencymgr;
		private CurrencyManager cached_currencymgr_events;
		private bool accept_listmgrevents;
		#endregion // Local Variables

		#region Public Constructors
		public DataGrid ()
		{
			grid_drawing = new DataGridDrawing (this);
			allow_navigation = true;
			allow_sorting = true;
			begininit = false;
			backColor = ThemeEngine.Current.DataGridBackColor;
			alternating_backcolor = def_alternating_backcolor;
			background_color = def_background_color;
			border_style = BorderStyle.Fixed3D;
			caption_backcolor = def_caption_backcolor;
			caption_font = null;
			caption_forecolor = def_caption_forecolor;
			caption_text = string.Empty;
			caption_visible = true;
			columnheaders_visible = true;
			datasource = null;
			real_datasource = null;
			datamember = string.Empty;
			firstvisible_column = 0;
			flatmode = false;
			gridline_color = def_gridline_color;
			gridline_style = DataGridLineStyle.Solid;
			header_backcolor = def_header_backcolor;
			header_forecolor = def_header_forecolor;
			header_font = def_header_font;
			link_color = def_link_color;
			link_hovercolor = def_link_hovercolor;
			parentrowsback_color = def_parentrowsback_color;
			parentrowsfore_color = def_parentrowsfore_color;
			parentrows_visible = true;
			preferredcolumn_width = ThemeEngine.Current.DataGridPreferredColumnWidth;
			_readonly = false;
			rowheaders_visible = true;
			selection_backcolor = def_selection_backcolor;
			selection_forecolor = def_selection_forecolor;
			rowheaders_width = 35;
			visiblecolumn_count = 0;
			visiblerow_count = 0;
			current_cell = new DataGridCell ();
			first_visiblerow = 0;
			first_visiblecolumn = 0;
			horz_pixeloffset = 0;
			is_editing = false;
			is_changing = false;
			is_adding = false;
			parentrowslabel_style = DataGridParentRowsLabelStyle.Both;
			selected_rows = new Hashtable ();
			ctrl_pressed = false;
			shift_pressed = false;
			preferredrow_height = def_preferredrow_height = FontHeight + 3;
			cached_currencymgr_events = cached_currencymgr = null;
			accept_listmgrevents = true;

			default_style = new DataGridTableStyle (true);
			styles_collection = new GridTableStylesCollection (this);
			styles_collection.CollectionChanged += new CollectionChangeEventHandler (OnTableStylesCollectionChanged);

			CurrentTableStyle = default_style;

			horiz_scrollbar = new HScrollBar ();
			horiz_scrollbar.Scroll += new ScrollEventHandler  (GridHScrolled);
			vert_scrollbar = new VScrollBar ();
			vert_scrollbar.Scroll += new ScrollEventHandler (GridVScrolled);			
			KeyUp += new KeyEventHandler (OnKeyUpDG);			

			SetStyle (ControlStyles.UserPaint | ControlStyles.AllPaintingInWmPaint, true);

		}

		#endregion	// Public Constructor

		#region Public Instance Properties

		[DefaultValue(true)]
		public bool AllowNavigation {
			get {
				return allow_navigation;
			}

			set {
				if (allow_navigation != value) {
					allow_navigation = value;
					OnAllowNavigationChanged (EventArgs.Empty);
				}
			}
		}

		[DefaultValue(true)]
		public bool AllowSorting {
			get {
				return allow_sorting;
			}

			set {
				if (allow_sorting != value) {
					allow_sorting = value;
				}
			}
		}

		public Color AlternatingBackColor  {
			get {
				return alternating_backcolor;
			}

			set {
				if (alternating_backcolor != value) {
					alternating_backcolor = value;
					Refresh ();
				}
			}
		}

		public Color BackColor {
			get {
				return backColor;
			}
			set {
				backColor = value;
			}
		}

		public Color BackgroundColor {
			get {
				return background_color;
			}
			set {
				 if (background_color != value) {
					background_color = value;
					OnBackgroundColorChanged (EventArgs.Empty);
					Refresh ();
				}
			}
		}

		[Browsable(false)]
		[EditorBrowsable(EditorBrowsableState.Never)]
		public Image BackgroundImage {
			get {
				return base.BackgroundImage;
			}

			set {
				base.BackgroundImage = value;
			}
		}

		[DispId(-504)]
		[DefaultValue(BorderStyle.Fixed3D)]
		public BorderStyle BorderStyle {
			get {
				return border_style;
			}

			set {
				 if (border_style != value) {
					border_style = value;
					CalcAreasAndInvalidate ();
					OnBorderStyleChanged (EventArgs.Empty);					
				}
			}
		}

		public Color CaptionBackColor {
			get {
				return caption_backcolor;
			}

			set {
				if (caption_backcolor != value) {
					caption_backcolor = value;
					grid_drawing.InvalidateCaption ();
				}
			}
		}

		[Localizable(true)]
		[AmbientValue(null)]
		public Font CaptionFont {
			get {
				if (caption_font == null) {
					return Font;
				}

				return caption_font;
			}

			set {
				if (caption_font != null && caption_font.Equals (value)) {
					return;
				}

				caption_font = value;
				CalcAreasAndInvalidate ();
			}
		}

		public Color CaptionForeColor {
			get {
				return caption_forecolor;
			}

			set {
				if (caption_forecolor != value) {
					caption_forecolor = value;
					grid_drawing.InvalidateCaption ();
				}
			}
		}

		[Localizable(true)]
		[DefaultValue("")]
		public string CaptionText {
			get {
				return caption_text;
			}

			set {
				if (caption_text != value) {
					caption_text = value;
					grid_drawing.InvalidateCaption ();
				}
			}
		}

		[DefaultValue(true)]
		public bool CaptionVisible {
			get {
				return caption_visible;
			}

			set {
				if (caption_visible != value) {
					caption_visible = value;
					CalcAreasAndInvalidate ();
					OnCaptionVisibleChanged (EventArgs.Empty);
				}
			}
		}

		[DefaultValue(true)]
		public bool ColumnHeadersVisible {
			get {
				return columnheaders_visible;
			}

			set {
				if (columnheaders_visible != value) {
					columnheaders_visible = value;
					CalcAreasAndInvalidate ();
				}
			}
		}

		[Browsable(false)]
		[DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
		public DataGridCell CurrentCell {
			get {
				return current_cell;
			}

			set {
				if (!current_cell.Equals (value)) {
					CancelEditing ();
					
					int old_row = current_cell.RowNumber;
					
					if (value.RowNumber >= RowsCount) {
						value.RowNumber = RowsCount == 0 ? 0 : RowsCount - 1;
					}
					
					if (value.ColumnNumber >= CurrentTableStyle.GridColumnStyles.Count) {
						value.ColumnNumber = CurrentTableStyle.GridColumnStyles.Count == 0 ? 0: CurrentTableStyle.GridColumnStyles.Count - 1;
					}
					
					EnsureCellVisilibility (value);
					current_cell = value;					
					
					if (current_cell.RowNumber != old_row) {
						grid_drawing.InvalidateRowHeader (old_row);
					}
					
					accept_listmgrevents = false;

					if (cached_currencymgr_events !=  null) {
						cached_currencymgr_events.Position = current_cell.RowNumber;
					}
					accept_listmgrevents = true;
					InvalidateCurrentRowHeader ();
					OnCurrentCellChanged (EventArgs.Empty);
				}
			}
		}

		[Browsable(false)]
		[DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
		public int CurrentRowIndex {
			get {
				if (ListManager == null) {
					return -1;
				}
				
				return current_cell.RowNumber;
			}

			set {
				if (current_cell.RowNumber != value) {
					CurrentCell = new DataGridCell (value, current_cell.ColumnNumber);
				}
			}
		}

		[Browsable(false)]
		[EditorBrowsable(EditorBrowsableState.Never)]
		public override Cursor Cursor {
			get {
				return base.Cursor;
			}
			set {
				base.Cursor = value;
			}
		}

		[DefaultValue(null)]
		[Editor ("System.Windows.Forms.Design.DataMemberListEditor, " + Consts.AssemblySystem_Design, "System.Drawing.Design.UITypeEditor, " + Consts.AssemblySystem_Drawing)]
		public string DataMember {
			get { return datamember; }
			set {
				if (SetDataMember (value)) {					
					SetDataSource (datasource);
					if (styles_collection.Contains (value) == true) {
						CurrentTableStyle = styles_collection[value];
						current_style.CreateColumnsForTable (true);
					} else {
						CurrentTableStyle = default_style;
						current_style.GridColumnStyles.Clear ();
						current_style.CreateColumnsForTable (false);
					}					
				}
			}
		}

		[DefaultValue(null)]
		[RefreshProperties(RefreshProperties.Repaint)]
		[TypeConverter("System.Windows.Forms.Design.DataSourceConverter, " + Consts.AssemblySystem_Design)]
		public object DataSource {
			get {
				return datasource;
			}

			set {
				if (SetDataSource (value)) {
					SetNewDataSource ();					
				}
			}
		}

		protected override Size DefaultSize {
			get {
				return new Size (130, 80);
			}
		}

		[Browsable(false)]
		public int FirstVisibleColumn {
			get {
				return firstvisible_column;
			}
		}

		[DefaultValue(false)]
		public bool FlatMode {
			get {
				return flatmode;
			}

			set {
				if (flatmode != value) {
					flatmode = value;
					OnFlatModeChanged (EventArgs.Empty);
					Refresh ();
				}
			}
		}

		public Color ForeColor {
			get {
				return base.ForeColor;
			}

			set {
				base.ForeColor = value;
			}
		}

		public Color GridLineColor {
			get {
				return gridline_color;
			}

			set {
				if (value == Color.Empty) {
					throw new ArgumentException ("Color.Empty value is invalid.");
				}

				if (gridline_color != value) {
					gridline_color = value;
					Refresh ();
				}
			}
		}

		[DefaultValue(DataGridLineStyle.Solid)]
		public DataGridLineStyle GridLineStyle {
			get {
				return gridline_style;
			}

			set {
				if (gridline_style != value) {
					gridline_style = value;
					Refresh ();
				}
			}
		}

		public Color HeaderBackColor {
			get {
				return header_backcolor;
			}

			set {
				if (value == Color.Empty) {
					throw new ArgumentException ("Color.Empty value is invalid.");
				}

				if (header_backcolor != value) {
					header_backcolor = value;
					Refresh ();
				}
			}
		}

		public Font HeaderFont {
			get {
				return header_font;
			}

			set {
				if (header_font != null && !header_font.Equals (value)) {
					header_font = value;
					CalcAreasAndInvalidate ();
				}
			}
		}

		public Color HeaderForeColor {
			get {
				return header_forecolor;
			}

			set {
				if (header_forecolor != value) {
					header_forecolor = value;
					Refresh ();
				}
			}
		}

		protected ScrollBar HorizScrollBar {
			get {
				return horiz_scrollbar;
			}
		}

		public object this [DataGridCell cell] {
			get  {
				return this [cell.RowNumber, cell.ColumnNumber];
			}

			set {
				this [cell.RowNumber, cell.ColumnNumber] = value;
			}
		}

		public object this [int rowIndex, int columnIndex] {
			get  {
				return CurrentTableStyle.GridColumnStyles[columnIndex].GetColumnValueAtRow (ListManager,
					rowIndex);
			}

			set {
				CurrentTableStyle.GridColumnStyles[columnIndex].SetColumnValueAtRow (ListManager,
					rowIndex, value);
			}
		}

		public Color LinkColor {
			get {
				return link_color;
			}
			set {
				if (link_color != value) {
					link_color = value;
					Refresh ();
				}
			}
		}

		[ComVisible(false)]
		[Browsable(false)]
		[EditorBrowsable(EditorBrowsableState.Never)]
		public Color LinkHoverColor {
			get {
				return link_hovercolor;
			}

			set {
				if (link_hovercolor != value) {
					link_hovercolor = value;
					Refresh ();
				}
			}
		}

		[Browsable(false)]
		[EditorBrowsable(EditorBrowsableState.Advanced)]
		protected internal CurrencyManager ListManager {
			get {
				if (BindingContext == null || DataSource  == null) {
					return null;
				}

				if (cached_currencymgr != null) {
					return cached_currencymgr;
				}

				// If we bind real_datasource object we do not get the events from ListManger
				// since the object is not the datasource and does not match
				cached_currencymgr = (CurrencyManager) BindingContext [real_datasource, DataMember];
				cached_currencymgr_events = (CurrencyManager) BindingContext [datasource, DataMember];
				ConnectListManagerEvents ();
				return cached_currencymgr;
			}

			set {
				throw new NotSupportedException ("Operation is not supported.");
			}
		}

		public Color ParentRowsBackColor {
			get {
				return parentrowsback_color;
			}

			set {
				if (parentrowsback_color != value) {
					parentrowsback_color = value;
					if (parentrows_visible) {
						Refresh ();
					}
				}
			}
		}

		public Color ParentRowsForeColor {
			get {
				return parentrowsfore_color;
			}

			set {
				if (parentrowsfore_color != value) {
					parentrowsfore_color = value;
					if (parentrows_visible) {
						Refresh ();
					}
				}
			}
		}

		[DefaultValue(DataGridParentRowsLabelStyle.Both)]
		[DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
		public DataGridParentRowsLabelStyle ParentRowsLabelStyle {
			get {
				return parentrowslabel_style;
			}

			set {
				if (parentrowslabel_style != value) {
					parentrowslabel_style = value;
					if (parentrows_visible) {
						Refresh ();
					}

					OnParentRowsLabelStyleChanged (EventArgs.Empty);
				}
			}
		}

		[DefaultValue(true)]
		public bool ParentRowsVisible {
			get {
				return parentrows_visible;
			}

			set {
				if (parentrows_visible != value) {
					parentrows_visible = value;
					CalcAreasAndInvalidate ();
					OnParentRowsVisibleChanged (EventArgs.Empty);
				}
			}
		}

		// Settting this property seems to have no effect.
		[DefaultValue(75)]
		[TypeConverter(typeof(DataGridPreferredColumnWidthTypeConverter))]
		public int PreferredColumnWidth {
			get {
				return preferredcolumn_width;
			}

			set {
				if (value < 0) {
					throw new ArgumentException ("PreferredColumnWidth is less than 0");
				}

				if (preferredcolumn_width != value) {
					preferredcolumn_width = value;
					Refresh ();
				}
			}
		}

		public int PreferredRowHeight {
			get {
				return preferredrow_height;
			}

			set {
				if (preferredrow_height != value) {
					preferredrow_height = value;
					CalcAreasAndInvalidate ();
				}
			}
		}

		[DefaultValue(false)]
		public bool ReadOnly {
			get {
				return _readonly;
			}

			set {
				if (_readonly != value) {
					_readonly = value;
					OnReadOnlyChanged (EventArgs.Empty);
					CalcAreasAndInvalidate ();
				}
			}
		}

		[DefaultValue(true)]
		public bool RowHeadersVisible {
			get {
				return rowheaders_visible;
			}

			set {
				if (rowheaders_visible != value) {
					rowheaders_visible = value;
					CalcAreasAndInvalidate ();
				}
			}
		}

		[DefaultValue(35)]
		public int RowHeaderWidth {
			get {
				return rowheaders_width;
			}

			set {
				if (rowheaders_width != value) {
					rowheaders_width = value;
					CalcAreasAndInvalidate ();
				}
			}
		}

		public Color SelectionBackColor {
			get {
				return selection_backcolor;
			}

			set {
				if (selection_backcolor != value) {
					selection_backcolor = value;
					Refresh ();
				}
			}
		}

		public Color SelectionForeColor  {
			get {
				return selection_forecolor;
			}

			set {
				if (selection_forecolor != value) {
					selection_forecolor = value;
					Refresh ();
				}
			}
		}

		public override ISite Site {
			get {
				return base.Site;
			}
			set {
				base.Site = value;
			}
		}

		[Localizable(true)]
		[DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
		public GridTableStylesCollection TableStyles {
			get { return styles_collection; }
		}

		[Bindable(false)]
		[Browsable(false)]
		[DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
		[EditorBrowsable(EditorBrowsableState.Never)]
		public override string Text {
			get {
				return base.Text;
			}
			set {
				base.Text = value;
			}
		}

		[Browsable(false)]
		[EditorBrowsable(EditorBrowsableState.Advanced)]
		protected ScrollBar VertScrollBar {
			get {
				return vert_scrollbar;
			}
		}

		[Browsable(false)]
		public int VisibleColumnCount {
			get {
				return visiblecolumn_count;
			}
		}

		// Calculated at DataGridDrawing.CalcRowsHeaders
		[Browsable(false)]
		public int VisibleRowCount {
			get {
				return visiblerow_count;
			}
		}

		#endregion	// Public Instance Properties

		#region Private Instance Properties
		internal DataGridTableStyle CurrentTableStyle {
			get {
				return current_style;
			}
			set {
				current_style = value;
				current_style.DataGrid = this;
				CalcAreasAndInvalidate ();
			}
		}

		internal int FirstVisibleRow {
			get { return first_visiblerow; }
			set { first_visiblerow = value;}
		}
		
		internal int RowsCount {
			get {				
				if (ListManager != null) {
					return ListManager.Count;					
				}

				return 0;
			}
		}

		internal int RowHeight {
			get {
				if (CurrentTableStyle.CurrentPreferredRowHeight > Font.Height + 3 + 1 /* line */) {
					return CurrentTableStyle.CurrentPreferredRowHeight;

				} else {
					return Font.Height + 3 + 1 /* line */;
				}
			}
		}
		
		internal bool ShowEditRow {
			get {
				if (ListManager != null && ListManager.CanAddRows == false) {
					return false;
				}
								
				return _readonly == false;
			}
		}
		
		// It should only be shown if there are relations that
		// we do not support right now
		internal bool ShowParentRowsVisible {
			get {
				//See parentrows_visible;
				return false;
			}
		}
		
		#endregion Private Instance Properties

		#region Public Instance Methods

		[MonoTODO]
		public virtual bool BeginEdit (DataGridColumnStyle gridColumn, int rowNumber)
		{
			return false;
		}

		public virtual void BeginInit ()
		{
			begininit = true;
		}

		protected virtual void CancelEditing ()
		{			
			if (current_cell.ColumnNumber < CurrentTableStyle.GridColumnStyles.Count) {
				CurrentTableStyle.GridColumnStyles[current_cell.ColumnNumber].Abort (current_cell.RowNumber);
			}
			
			if (is_adding == true) {
				ListManager.RemoveAt (RowsCount - 1);
				is_adding = false;
			}
			
			is_editing = false;
			is_changing = false;
			InvalidateCurrentRowHeader ();
		}

		[MonoTODO]
		public void Collapse (int row)
		{

		}

		protected internal virtual void ColumnStartedEditing (Control editingControl)
		{

		}

		protected internal virtual void ColumnStartedEditing (Rectangle bounds)
		{

		}

		protected override AccessibleObject CreateAccessibilityInstance ()
		{
			return base.CreateAccessibilityInstance ();
		}

		protected virtual DataGridColumnStyle CreateGridColumn (PropertyDescriptor prop)
		{
			return CreateGridColumn (prop, false);
		}

		protected virtual DataGridColumnStyle CreateGridColumn (PropertyDescriptor prop, bool isDefault)
		{
			throw new NotImplementedException();
		}

		protected override void Dispose (bool disposing)
		{
			base.Dispose (disposing);
		}

		public virtual bool EndEdit (DataGridColumnStyle gridColumn, int rowNumber, bool shouldAbort)
		{						
			if (is_adding == true) {				
				if (shouldAbort) {
					ListManager.CancelCurrentEdit ();
				} else {
					ListManager.EndCurrentEdit ();
					CalcAreasAndInvalidate ();
				}
				is_adding = false;
			} 

			if (shouldAbort || gridColumn.ParentReadOnly ==true) {
				gridColumn.Abort (rowNumber);
			} else {
				gridColumn.Commit (ListManager, rowNumber);
			}

			is_editing = false;
			is_changing = false;
			InvalidateCurrentRowHeader ();
			return true;
		}

		public virtual void EndInit ()
		{
			begininit = false;
		}

		public void Expand (int row)
		{

		}

		public Rectangle GetCellBounds (DataGridCell cell)
		{
			return GetCellBounds (cell.RowNumber, cell.ColumnNumber);
		}

		public Rectangle GetCellBounds (int row, int col)
		{
			return grid_drawing.GetCellBounds (row, col);
		}

		public Rectangle GetCurrentCellBounds ()
		{
			return GetCellBounds (current_cell.RowNumber, current_cell.ColumnNumber);
		}

		protected virtual string GetOutputTextDelimiter ()
		{
			return string.Empty;
		}

		protected virtual void GridHScrolled (object sender, ScrollEventArgs se)
		{
			if (se.NewValue == horz_pixeloffset ||
				se.Type == ScrollEventType.EndScroll) {
				return;
			}

			ScrollToColumnInPixels (se.NewValue);
		}

		protected virtual void GridVScrolled (object sender, ScrollEventArgs se)
		{
			int old_first_visiblerow = first_visiblerow;
			first_visiblerow = se.NewValue;
			grid_drawing.UpdateVisibleRowCount ();
			
			if (first_visiblerow == old_first_visiblerow) {
				return;
			}			
			ScrollToRow (old_first_visiblerow, first_visiblerow);
		}

		public HitTestInfo HitTest (Point position)
		{
			return HitTest (position.X, position.Y);
		}

		public HitTestInfo HitTest (int x, int y)
		{
			return grid_drawing.HitTest (x, y);
		}

		[MonoTODO]
		public bool IsExpanded (int rowNumber)
		{
			return false;
		}

		public bool IsSelected (int row)
		{
			return selected_rows[row] != null;
		}

		[MonoTODO]
		public void NavigateBack ()
		{

		}

		[MonoTODO]
		public void NavigateTo (int rowNumber, string relationName)
		{

		}

		protected virtual void OnAllowNavigationChanged (EventArgs e)
		{
			if (AllowNavigationChanged != null) {
				AllowNavigationChanged (this, e);
			}
		}

		protected void OnBackButtonClicked (object sender,  EventArgs e)
		{
			if (BackButtonClick != null) {
				BackButtonClick (sender, e);
			}
		}

		protected override void OnBackColorChanged (EventArgs e)
		{
			base.OnBackColorChanged (e);
		}

		protected virtual void OnBackgroundColorChanged (EventArgs e)
		{
			if (BackgroundColorChanged != null) {
				BackgroundColorChanged (this, e);
			}
		}

		protected override void OnBindingContextChanged( EventArgs e)
		{
			base.OnBindingContextChanged (e);
		}

		protected virtual void OnBorderStyleChanged (EventArgs e)
		{
			if (BorderStyleChanged != null) {
				BorderStyleChanged (this, e);
			}
		}

		protected virtual void OnCaptionVisibleChanged (EventArgs e)
		{
			if (CaptionVisibleChanged != null) {
				CaptionVisibleChanged (this, e);
			}
		}

		protected virtual void OnCurrentCellChanged (EventArgs e)
		{
			if (CurrentCellChanged != null) {
				CurrentCellChanged (this, e);
			}
		}

		protected virtual void OnDataSourceChanged (EventArgs e)
		{
			if (DataSourceChanged != null) {
				DataSourceChanged (this, e);
			}
		}

		protected override void OnEnter (EventArgs e)
		{
			base.OnEnter (e);
		}

		protected virtual void OnFlatModeChanged (EventArgs e)
		{
			if (FlatModeChanged != null) {
				FlatModeChanged (this, e);
			}
		}

		protected override void OnFontChanged (EventArgs e)
		{
			grid_drawing.CalcGridAreas ();
			base.OnFontChanged (e);
		}

		protected override void OnForeColorChanged (EventArgs e)
		{
			base.OnForeColorChanged (e);
		}

		protected override void OnHandleCreated (EventArgs e)
		{
			base.OnHandleCreated (e);
			grid_drawing.CalcGridAreas ();
		}

		protected override void OnHandleDestroyed (EventArgs e)
		{
			base.OnHandleDestroyed (e);
		}

		protected override void OnKeyDown (KeyEventArgs ke)
		{
			base.OnKeyDown (ke);
			
			if (ProcessGridKey (ke) == true) {
				ke.Handled = true;
			}

			CurrentTableStyle.GridColumnStyles[current_cell.ColumnNumber].OnKeyDown
				(ke, current_cell.RowNumber, current_cell.ColumnNumber);
		}

		protected override void OnKeyPress (KeyPressEventArgs kpe)
		{
			base.OnKeyPress (kpe);
		}

		protected override void OnLayout (LayoutEventArgs levent)
		{
			base.OnLayout (levent);
		}

		protected override void OnLeave (EventArgs e)
		{
			base.OnLeave (e);
		}

		protected override void OnMouseDown (MouseEventArgs e)
		{
			base.OnMouseDown (e);

			HitTestInfo testinfo;
			testinfo = grid_drawing.HitTest (e.X, e.Y);

			switch (testinfo.type) {
			case HitTestType.Cell:
			{
				DataGridCell new_cell = new DataGridCell (testinfo.Row, testinfo.Column);

				if (new_cell.Equals (current_cell) == false) {
					CancelEditing ();
					CurrentCell = new_cell;
					EditCell (current_cell);

				} else {
					CurrentTableStyle.GridColumnStyles[testinfo.Column].OnMouseDown (e, testinfo.Row, testinfo.Column);
				}

				break;
			}
			case HitTestType.RowHeader:
			{
				if (ctrl_pressed == false && shift_pressed == false) {
					ResetSelection (); // Invalidates selected rows
				}

				if (shift_pressed == true) {
					ShiftSelection (testinfo.Row);
				} else { // ctrl_pressed or single item
					Select (testinfo.Row);
				}

				CancelEditing ();
				CurrentCell = new DataGridCell (testinfo.Row, current_cell.ColumnNumber);
				OnRowHeaderClick (EventArgs.Empty);
				break;
			}
			default:
				break;
			}
		}

		protected override void OnMouseLeave (EventArgs e)
		{
			base.OnMouseLeave (e);
		}

		protected override void OnMouseMove (MouseEventArgs e)
		{
			base.OnMouseMove (e);
		}

		protected override void OnMouseUp (MouseEventArgs e)
		{
			base.OnMouseUp (e);
		}

		protected override void OnMouseWheel (MouseEventArgs e)
		{
			base.OnMouseWheel (e);

			if (e.Delta > 0) {
				if (current_cell.RowNumber > 0) {
					CurrentCell = new DataGridCell (current_cell.RowNumber - 1, current_cell.ColumnNumber);
				}
			}
			else {
				if (current_cell.RowNumber < RowsCount - 1) {
					CurrentCell = new DataGridCell (current_cell.RowNumber + 1, current_cell.ColumnNumber);					
				}
			}
		}

		protected void OnNavigate (NavigateEventArgs e)
		{
			if (Navigate != null) {
				Navigate (this, e);
			}
		}

		protected override void OnPaint (PaintEventArgs pe)
		{
			ThemeEngine.Current.DataGridPaint (pe, this);
		}

		protected override void OnPaintBackground (PaintEventArgs ebe)
		{
			base.OnPaintBackground (ebe);
		}

		protected virtual void OnParentRowsLabelStyleChanged (EventArgs e)
		{
			if (ParentRowsLabelStyleChanged != null) {
				ParentRowsLabelStyleChanged (this, e);
			}
		}

		protected virtual void OnParentRowsVisibleChanged (EventArgs e)
		{
			if (ParentRowsVisibleChanged != null) {
				ParentRowsVisibleChanged (this, e);
			}
		}

		protected virtual void OnReadOnlyChanged (EventArgs e)
		{
			if (ReadOnlyChanged != null) {
				ReadOnlyChanged (this, e);
			}
		}

		protected override void OnResize (EventArgs e)
		{
			base.OnResize (e);
		}

		protected void OnRowHeaderClick (EventArgs e)
		{
			if (RowHeaderClick != null) {
				RowHeaderClick (this, e);
			}
		}

		protected void OnScroll (EventArgs e)
		{
			if (Scroll != null) {
				Scroll (this, e);
			}
		}

		protected void OnShowParentDetailsButtonClicked (object sender, EventArgs e)
		{
			if (ShowParentDetailsButtonClick != null) {
				ShowParentDetailsButtonClick (sender, e);
			}
		}

		protected override bool ProcessDialogKey (Keys keyData)
		{
			return base.ProcessDialogKey (keyData);
		}

		protected bool ProcessGridKey (KeyEventArgs ke)
		{
			if (RowsCount == 0) {
				return false;
			}

			switch (ke.KeyCode) {
			case Keys.ControlKey:
				ctrl_pressed = true;
				break;
			case Keys.ShiftKey:
				shift_pressed = true;
				break;
			case Keys.Up:
			{
				if (current_cell.RowNumber > 0) {
					CurrentCell = new DataGridCell (current_cell.RowNumber - 1, current_cell.ColumnNumber);
					EditCell (current_cell);
				}
				break;
			}
			case Keys.Down:
			{
				if (current_cell.RowNumber < RowsCount - 1) {
					CurrentCell = new DataGridCell (current_cell.RowNumber + 1, current_cell.ColumnNumber);
					EditCell (current_cell);
				}
				break;
			}
			case Keys.Tab:
			case Keys.Right:
			{				
				if (current_cell.ColumnNumber + 1 < CurrentTableStyle.GridColumnStyles.Count) {
					CurrentCell = new DataGridCell (current_cell.RowNumber, current_cell.ColumnNumber + 1);
					EditCell (current_cell);
				}
				break;
			}
			case Keys.Left:
			{
				if (current_cell.ColumnNumber > 0) {
					CurrentCell = new DataGridCell (current_cell.RowNumber, current_cell.ColumnNumber - 1);
					EditCell (current_cell);
				}
				break;
			}
			case Keys.PageUp:
			{
				if (current_cell.RowNumber > grid_drawing.VLargeChange) {
					CurrentCell = new DataGridCell (current_cell.RowNumber - grid_drawing.VLargeChange, current_cell.ColumnNumber);
				} else {
					CurrentCell = new DataGridCell (0, current_cell.ColumnNumber);
				}

				EditCell (current_cell);
				break;
			}
			case Keys.PageDown:
			{
				if (current_cell.RowNumber + grid_drawing.VLargeChange < RowsCount) {
					CurrentCell = new DataGridCell (current_cell.RowNumber + grid_drawing.VLargeChange, current_cell.ColumnNumber);
				} else {
					CurrentCell = new DataGridCell (RowsCount - 1, current_cell.ColumnNumber);
				}

				EditCell (current_cell);
				break;
			}
			case Keys.Home:
			{
				CurrentCell = new DataGridCell (0, current_cell.ColumnNumber);
				EditCell (current_cell);
				break;
			}
			case Keys.End:
			{
				CurrentCell = new DataGridCell (RowsCount - 1, current_cell.ColumnNumber);
				EditCell (current_cell);
				break;
			}
			case Keys.Delete:
			{				
				foreach (int row in selected_rows.Keys) {
					ListManager.RemoveAt (row);						
				}
				selected_rows.Clear ();
				CalcAreasAndInvalidate ();
				break;					
			}
			default:
				return false; // message not processed
			}

			return true; // message processed
		}

		// Called from DataGridTextBox
		protected override bool ProcessKeyPreview (ref Message m)
		{
			Keys key = (Keys) m.WParam.ToInt32 ();
			KeyEventArgs ke = new KeyEventArgs (key);
			if (ProcessGridKey (ke) == true) {
				return true;
			}

			return base.ProcessKeyPreview (ref m);
		}
		
		protected bool ProcessTabKey (Keys keyData)
		{
			return false;
		}

		public void ResetAlternatingBackColor ()
		{
			alternating_backcolor = def_alternating_backcolor;
		}

		public override void ResetBackColor ()
		{
			base.ResetBackColor ();
		}

		public override void ResetForeColor ()
		{
			base.ResetForeColor ();
		}

		public void ResetGridLineColor ()
		{
			gridline_color = def_gridline_color;
		}

		public void ResetHeaderBackColor ()
		{
			header_backcolor = def_header_backcolor;
		}

		public void ResetHeaderFont ()
		{
			header_font = def_header_font;
		}

		public void ResetHeaderForeColor ()
		{
			header_forecolor = def_header_forecolor;
		}

		public void ResetLinkColor ()
		{
			link_color = def_link_color;
		}

		public void ResetLinkHoverColor ()
		{
			link_hovercolor = def_link_hovercolor;
		}

		protected void ResetSelection ()
		{			
			foreach (int row in selected_rows.Keys) {
				grid_drawing.InvalidateRow (row);
				grid_drawing.InvalidateRowHeader (row);
			}

			selected_rows.Clear ();
		}

		public void ResetSelectionBackColor ()
		{
			selection_backcolor = def_selection_backcolor;
		}

		public void ResetSelectionForeColor ()
		{
			selection_forecolor = def_selection_forecolor;
		}

		public void Select (int row)
		{
			if (selected_rows[row] == null) {
				selected_rows.Add (row, true);
			} else {
				selected_rows[row] = true;
			}

			grid_drawing.InvalidateRow (row);
		}

		public void SetDataBinding (object dataSource, string dataMember)
		{
			bool source = SetDataSource (dataSource);
			bool member = SetDataMember (dataMember);
			
			if (source == false  && member == false) {
				return;
			}

			SetNewDataSource ();
		}

		protected virtual bool ShouldSerializeAlternatingBackColor ()
		{
			return (alternating_backcolor != def_alternating_backcolor);
		}

		protected virtual bool ShouldSerializeBackgroundColor ()
		{
			return (background_color != def_background_color);
		}

		protected virtual bool ShouldSerializeCaptionBackColor ()
		{
			return (caption_backcolor != def_caption_backcolor);
		}

		protected virtual bool ShouldSerializeCaptionForeColor ()
		{
			return (caption_forecolor != def_caption_forecolor);
		}

		protected virtual bool ShouldSerializeGridLineColor ()
		{
			return (gridline_color != def_gridline_color);
		}

		protected virtual bool ShouldSerializeHeaderBackColor ()
		{
			return (header_backcolor != def_header_backcolor);
		}

		protected bool ShouldSerializeHeaderFont ()
		{
			return (header_font != def_header_font);
		}

		protected virtual bool ShouldSerializeHeaderForeColor ()
		{
			return (header_forecolor != def_header_forecolor);
		}

		protected virtual bool ShouldSerializeLinkHoverColor ()
		{
			return (link_hovercolor != def_link_hovercolor);
		}

		protected virtual bool ShouldSerializeParentRowsBackColor ()
		{
			return (parentrowsback_color != def_parentrowsback_color);
		}

		protected virtual bool ShouldSerializeParentRowsForeColor ()
		{
			return (parentrowsback_color != def_parentrowsback_color);
		}

		protected bool ShouldSerializePreferredRowHeight ()
		{
			return (preferredrow_height != def_preferredrow_height);
		}

		protected bool ShouldSerializeSelectionBackColor ()
		{
			return (selection_backcolor != def_selection_backcolor);
		}

		protected virtual bool ShouldSerializeSelectionForeColor ()
		{
			return (selection_forecolor != def_selection_forecolor);
		}

		public void SubObjectsSiteChange (bool site)
		{

		}

		public void UnSelect (int row)
		{
			selected_rows.Remove (row);
			grid_drawing.InvalidateRow (row);

		}
		#endregion	// Public Instance Methods

		#region Private Instance Methods

		internal void CalcAreasAndInvalidate ()
		{
			grid_drawing.CalcGridAreas ();
			Invalidate ();
		}
		
		private void ConnectListManagerEvents ()
		{
			cached_currencymgr_events.CurrentChanged += new EventHandler (OnListManagerCurrentChanged);			
		}
		
		private void DisconnectListManagerEvents ()
		{
			
		}

		// EndEdit current editing operation
		internal virtual bool EndEdit (bool shouldAbort)
		{
			return EndEdit (CurrentTableStyle.GridColumnStyles[current_cell.ColumnNumber],
				current_cell.RowNumber, shouldAbort);
		}

		private void EnsureCellVisilibility (DataGridCell cell)
		{
			if (cell.ColumnNumber <= first_visiblecolumn ||
				cell.ColumnNumber + 1 >= first_visiblecolumn + visiblecolumn_count) {			
					
				first_visiblecolumn = grid_drawing.GetFirstColumnForColumnVisilibility (first_visiblecolumn, cell.ColumnNumber);						
				
				int pixel = grid_drawing.GetColumnStartingPixel (first_visiblecolumn);
				ScrollToColumnInPixels (pixel);
			}

			if (cell.RowNumber < first_visiblerow ||
				cell.RowNumber + 1 >= first_visiblerow + visiblerow_count) {

				if (cell.RowNumber + 1 >= first_visiblerow + visiblerow_count) {
					int old_first_visiblerow = first_visiblerow;
					first_visiblerow = 1 + cell.RowNumber - visiblerow_count;
					grid_drawing.UpdateVisibleRowCount ();
					ScrollToRow (old_first_visiblerow, first_visiblerow);
				}else {
					int old_first_visiblerow = first_visiblerow;
					first_visiblerow = cell.RowNumber;
					grid_drawing.UpdateVisibleRowCount ();
					ScrollToRow (old_first_visiblerow, first_visiblerow);
				}

				vert_scrollbar.Value = first_visiblerow;
			}
		}
		
		internal IEnumerable GetDataSource (object source, string member)
		{	
			IListSource src = (IListSource) source;
			IList list = src.GetList();
			IListSource listsource;
			ITypedList typedlist;
					
			if (source is IEnumerable) {
				return (IEnumerable) source;
			}
			
			if(src.ContainsListCollection == false)	{
				return list;
			}
			
			listsource = (IListSource) source;
			
			if (listsource == null) {
				return null;
			}
			
			list = src.GetList ();
			
			if (list == null) {
				return null;
			}
			
			typedlist = (ITypedList) list;
				
			if (typedlist == null) {
				return null;
			}			

			PropertyDescriptorCollection col = typedlist.GetItemProperties (new PropertyDescriptor [0]);
			PropertyDescriptor prop = col.Find (member, true);
								
			if (prop == null) {
				if (col.Count > 0) {
					prop = col[0];

					if (prop == null) {
						return null;
					}
				}
			}
			
			IEnumerable result =  (IEnumerable)(prop.GetValue (list[0]));
			return result;		
			
		}

		internal void InvalidateCurrentRowHeader ()
		{
			grid_drawing.InvalidateRowHeader (current_cell.RowNumber);
		}

		private bool SetDataMember (string member)
		{			
			if (member == datamember) {
				return false;
			}

			datamember = member;
			real_datasource = GetDataSource (datasource, member);
			DisconnectListManagerEvents ();
			cached_currencymgr = cached_currencymgr_events = null;
			return true;
		}

		private bool SetDataSource (object source)
		{			

			if (source != null && source as IListSource != null && source as IList != null) {
				throw new Exception ("Wrong complex data binding source");
			}
			
			current_cell = new DataGridCell ();
			datasource = source;
			DisconnectListManagerEvents ();
			cached_currencymgr = cached_currencymgr_events = null;
			try {
				real_datasource = GetDataSource (datasource, DataMember);
			}catch (Exception e) {				
				real_datasource = source;
			}

			OnDataSourceChanged (EventArgs.Empty);
			return true;
		}

		private void SetNewDataSource ()
		{				
			current_style.GridColumnStyles.Clear ();
			current_style.CreateColumnsForTable (false);
			CalcAreasAndInvalidate ();			
		}

		private void OnKeyUpDG (object sender, KeyEventArgs e)
		{
			switch (e.KeyCode) {
			case Keys.ControlKey:
				ctrl_pressed = false;
				break;
			case Keys.ShiftKey:
				shift_pressed = false;
				break;
			default:
				break;
			}
		}
		
		private void OnListManagerCurrentChanged (object sender, EventArgs e)
		{			
			if (accept_listmgrevents == false) {
				return;
			}
			
			CurrentCell = new DataGridCell (cached_currencymgr_events.Position, current_cell.RowNumber);
		}
		
		private void OnTableStylesCollectionChanged (object sender, CollectionChangeEventArgs e)
		{	
			if (ListManager != null && String.Compare (ListManager.ListName, ((DataGridTableStyle)e.Element).MappingName, true) == 0) {			
				CurrentTableStyle = (DataGridTableStyle)e.Element;
				((DataGridTableStyle) e.Element).CreateColumnsForTable (false);				
			}
						
			CalcAreasAndInvalidate ();
		}

		private void EditCell (DataGridCell cell)
		{
			ResetSelection (); // Invalidates selected rows
			is_editing = false;
			is_changing = false;
			
			if (ShowEditRow && is_adding == false && cell.RowNumber >= RowsCount) {
				ListManager.AddNew ();
				is_adding = true;
				Invalidate (); // We have just added a new row
			}
			
			CurrentTableStyle.GridColumnStyles[cell.ColumnNumber].Edit (ListManager,
				cell.RowNumber, GetCellBounds (cell.RowNumber, cell.ColumnNumber),
				_readonly, string.Empty, true);
		}

		private void ShiftSelection (int index)
		{
			int shorter_item = -1, dist = RowsCount + 1, cur_dist;			

			foreach (int row in selected_rows.Keys) {

				if (row > index) {
					cur_dist = row - index;
				}
				else {
					cur_dist = index - row;
				}

				if (cur_dist < dist) {
					dist = cur_dist;
					shorter_item = row;
				}
			}

			if (shorter_item != -1) {
				int start, end;

				if (shorter_item > index) {
					start = index;
					end = shorter_item;
				} else {
					start = shorter_item;
					end = index;
				}

				ResetSelection ();
				for (int idx = start; idx <= end; idx++) {
					Select (idx);
				}
			}
		}

		private void ScrollToColumnInPixels (int pixel)
		{
			Rectangle invalidate = new Rectangle ();
			Rectangle invalidate_column = new Rectangle ();

			if (pixel > horz_pixeloffset) { // ScrollRight
				int pixels = pixel - horz_pixeloffset;
				
				horz_pixeloffset = horiz_scrollbar.Value = pixel;
				grid_drawing.UpdateVisibleColumn ();

				// Columns header
				invalidate_column.X = grid_drawing.ColumnsHeadersArea.X + grid_drawing.ColumnsHeadersArea.Width - pixels;
				invalidate_column.Y = grid_drawing.ColumnsHeadersArea.Y;
				invalidate_column.Width = pixels;
				invalidate_column.Height = grid_drawing.ColumnsHeadersArea.Height;
				XplatUI.ScrollWindow (Handle, grid_drawing.ColumnsHeadersArea, -pixels, 0, false);

				// Cells
				invalidate.X = grid_drawing.CellsArea.X + grid_drawing.CellsArea.Width - pixels;
				invalidate.Y = grid_drawing.CellsArea.Y;
				invalidate.Width = pixels;
				invalidate.Height = grid_drawing.CellsArea.Height;
				
				
				if (columnheaders_visible == true) {
					invalidate.Y -= grid_drawing.ColumnsHeadersArea.Height;
					invalidate.Height += grid_drawing.ColumnsHeadersArea.Height;
				}
				
				XplatUI.ScrollWindow (Handle, grid_drawing.CellsArea, -pixels, 0, false);
				Invalidate (invalidate_column);
				Invalidate (invalidate);


			} else {
				int pixels = horz_pixeloffset - pixel;
				Rectangle area = grid_drawing.CellsArea;
				
				horz_pixeloffset = horiz_scrollbar.Value = pixel;
				grid_drawing.UpdateVisibleColumn ();

				// Columns header
				invalidate_column.X = grid_drawing.ColumnsHeadersArea.X;
				invalidate_column.Y = grid_drawing.ColumnsHeadersArea.Y;
				invalidate_column.Width = pixels;
				invalidate_column.Height = grid_drawing.ColumnsHeadersArea.Height;
				//XplatUI.ScrollWindow (Handle, grid_drawing.ColumnsHeadersArea, pixels, 0, false);

				// Cells
				invalidate.X =  grid_drawing.CellsArea.X;
				invalidate.Y =  grid_drawing.CellsArea.Y;
				invalidate.Width = pixels;
				invalidate.Height = grid_drawing.CellsArea.Height;
				
				if (columnheaders_visible == true) {
					invalidate.Y -= grid_drawing.ColumnsHeadersArea.Height;
					invalidate.Height += grid_drawing.ColumnsHeadersArea.Height;
					area.Y -= grid_drawing.ColumnsHeadersArea.Height;
					area.Height += grid_drawing.ColumnsHeadersArea.Height;
				}
				
				XplatUI.ScrollWindow (Handle, area, pixels, 0, false);
				Invalidate (invalidate);
			}		
			
		}

		private void ScrollToRow (int old_row, int new_row)
		{
			Rectangle invalidate = new Rectangle ();			
			
			if (new_row > old_row) { // Scrolldown
				int scrolled_rows = new_row - old_row;
				int pixels = scrolled_rows * RowHeight;
				Rectangle rows_area = grid_drawing.CellsArea; // Cells area - partial rows space
				rows_area.Height = grid_drawing.CellsArea.Height - grid_drawing.CellsArea.Height % RowHeight;
				
				invalidate.X =  grid_drawing.CellsArea.X;
				invalidate.Y =  grid_drawing.CellsArea.Y + rows_area.Height - pixels;
				invalidate.Width = grid_drawing.CellsArea.Width;
				invalidate.Height = pixels;

				XplatUI.ScrollWindow (Handle, rows_area, 0, -pixels, false);

			} else { // ScrollUp
				int scrolled_rows = old_row - new_row;				
				int pixels = scrolled_rows * RowHeight;

				invalidate.X =  grid_drawing.CellsArea.X;
				invalidate.Y =  grid_drawing.CellsArea.Y;
				invalidate.Width = grid_drawing.CellsArea.Width;
				invalidate.Height = pixels;
				XplatUI.ScrollWindow (Handle, grid_drawing.CellsArea, 0, pixels, false);				
			}

			// Right now we use ScrollWindow Invalidate, let's leave remarked it here for X11 if need it
			//Invalidate (invalidate);
			Invalidate (grid_drawing.RowsHeadersArea);
		}

		#endregion Private Instance Methods


		#region Events
		public event EventHandler AllowNavigationChanged;
		public event EventHandler BackButtonClick;
		public event EventHandler BackgroundColorChanged;

		[Browsable(false)]
		[EditorBrowsable(EditorBrowsableState.Never)]
		public new event EventHandler BackgroundImageChanged;

		public event EventHandler BorderStyleChanged;
		public event EventHandler CaptionVisibleChanged;
		public event EventHandler CurrentCellChanged;

		[Browsable(false)]
		[EditorBrowsable(EditorBrowsableState.Never)]
		public new event EventHandler CursorChanged;

		public event EventHandler DataSourceChanged;
		public event EventHandler FlatModeChanged;
		public event NavigateEventHandler Navigate;
		public event EventHandler ParentRowsLabelStyleChanged;
		public event EventHandler ParentRowsVisibleChanged;
		public event EventHandler ReadOnlyChanged;
		protected event EventHandler RowHeaderClick;
		public event EventHandler Scroll;
		public event EventHandler ShowParentDetailsButtonClick;

		[Browsable(false)]
		[EditorBrowsable(EditorBrowsableState.Never)]
		public new event EventHandler TextChanged;
		#endregion	// Events
	}
}