TableCell.cs source code in C# .NET

Source code for the .NET framework in C#

                        

Code:

/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / System / Windows / Documents / TableCell.cs / 1305600 / TableCell.cs

                            //---------------------------------------------------------------------------- 
//
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
//
// 
// Description: Implementation of table cell 
//
//              See spec at http://avalon/layout/Tables/WPP%20TableOM.doc 
//
// History:
//  05/19/2003 : olego - Created
// 
//  Todo list:
//  1)  OnPropertyInvalidated is expensive and requires investigation: 
//      a)  Cell calls to base class implementation which fires back tree 
//          change event - Cell.OnTextContainerChange. As a result Cell.Invalidate
//          format is called twice. 
//      b)  base.OnPropertyInvalidated *always* creates DTR for the whole cell.
//          Why even AffectsRender causes it?
//---------------------------------------------------------------------------
using MS.Internal; 
using MS.Internal.PtsHost;
using MS.Internal.PtsTable; 
using MS.Internal.Text; 
using MS.Utility;
using System.Diagnostics; 
using System.Security;
using System.Windows.Threading;
using System.Collections;
using System.Windows; 
using System.Windows.Automation.Peers;
using System.Windows.Media; 
using System.Windows.Controls; 
using System.Windows.Markup;
using System.ComponentModel; // TypeConverter 
using System.Collections.Generic;
using MS.Internal.Documents;

using System; 

using MS.Internal.PtsHost.UnsafeNativeMethods; 
 
namespace System.Windows.Documents
{ 
    /// 
    /// Implementation of table cell
    /// 
    [ContentProperty("Blocks")] 
    public class TableCell : TextElement, IIndexedChild
    { 
        //----------------------------------------------------- 
        //
        //  Constructors 
        //
        //-----------------------------------------------------

        #region Constructors 

        ///  
        /// Default constructor 
        /// 
        public TableCell() 
            : base()
        {
            PrivateInitialize();
        } 

        ///  
        /// Default constructor 
        /// 
        public TableCell(Block blockItem) 
            : base()
        {
            PrivateInitialize();
 
            if (blockItem == null)
            { 
                throw new ArgumentNullException("blockItem"); 
            }
 
            this.Blocks.Add(blockItem);
        }

        #endregion Constructors 

        //------------------------------------------------------ 
        // 
        //  Public Methods
        // 
        //-----------------------------------------------------

        #region Public Methods
 
        /// 
        /// Called when tablecell gets new parent 
        ///  
        /// 
        /// New parent of cell 
        /// 
        internal override void OnNewParent(DependencyObject newParent)
        {
            DependencyObject oldParent = this.Parent; 
            TableRow newParentTR = newParent as TableRow;
 
            if((newParent != null) && (newParentTR == null)) 
            {
                throw new InvalidOperationException(SR.Get(SRID.TableInvalidParentNodeType, newParent.GetType().ToString())); 
            }

            if(oldParent != null)
            { 
                ((TableRow)oldParent).Cells.InternalRemove(this);
            } 
 
            base.OnNewParent(newParent);
 
            if ((newParentTR != null) && (newParentTR.Cells != null)) // keep PreSharp happy
            {
                newParentTR.Cells.InternalAdd(this);
            } 
        }
 
        #endregion Public Methods 

        //------------------------------------------------------ 
        //
        //  Public Properties
        //
        //------------------------------------------------------ 

        #region Public Properties 
 
        /// 
        /// Collection of Blocks contained in this Section. 
        /// 
        [DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
        public BlockCollection Blocks
        { 
            get
            { 
                return new BlockCollection(this, /*isOwnerParent*/true); 
            }
        } 

        /// 
        /// Column span property.
        ///  
        public int ColumnSpan
        { 
            get { return (int) GetValue(ColumnSpanProperty); } 
            set { SetValue(ColumnSpanProperty, value); }
        } 

        /// 
        /// Row span property.
        ///  
        public int RowSpan
        { 
            get { return (int) GetValue(RowSpanProperty); } 
            set { SetValue(RowSpanProperty, value); }
        } 

        //-------------------------------------------------------------------
        //
        // Protected Methods 
        //
        //---------------------------------------------------------------------- 
 
        #region Protected Methods
 
        /// 
        /// Creates AutomationPeer ()
        /// 
        protected override AutomationPeer OnCreateAutomationPeer() 
        {
            return new TableCellAutomationPeer(this); 
        } 

        #endregion Protected Methods 

        //.....................................................................
        //
        // Block Properties 
        //
        //..................................................................... 
 
        #region Block Properties
 
        /// 
        /// DependencyProperty for  property.
        /// 
        public static readonly DependencyProperty PaddingProperty = 
                Block.PaddingProperty.AddOwner(
                        typeof(TableCell), 
                        new FrameworkPropertyMetadata( 
                                new Thickness(),
                                FrameworkPropertyMetadataOptions.AffectsMeasure)); 

        /// 
        /// The Padding property specifies the padding of the element.
        ///  
        public Thickness Padding
        { 
            get { return (Thickness)GetValue(PaddingProperty); } 
            set { SetValue(PaddingProperty, value); }
        } 

        /// 
        /// DependencyProperty for  property.
        ///  
        public static readonly DependencyProperty BorderThicknessProperty =
                Block.BorderThicknessProperty.AddOwner( 
                        typeof(TableCell), 
                        new FrameworkPropertyMetadata(
                                new Thickness(), 
                                FrameworkPropertyMetadataOptions.AffectsMeasure));

        /// 
        /// The BorderThickness property specifies the border of the element. 
        /// 
        public Thickness BorderThickness 
        { 
            get { return (Thickness)GetValue(BorderThicknessProperty); }
            set { SetValue(BorderThicknessProperty, value); } 
        }

        /// 
        /// DependencyProperty for  property. 
        /// 
        public static readonly DependencyProperty BorderBrushProperty = 
                Block.BorderBrushProperty.AddOwner( 
                        typeof(TableCell),
                        new FrameworkPropertyMetadata( 
                                null,
                                FrameworkPropertyMetadataOptions.AffectsRender));

        ///  
        /// The BorderBrush property specifies the brush of the border.
        ///  
        public Brush BorderBrush 
        {
            get { return (Brush)GetValue(BorderBrushProperty); } 
            set { SetValue(BorderBrushProperty, value); }
        }

        ///  
        /// DependencyProperty for  property.
        ///  
        public static readonly DependencyProperty TextAlignmentProperty = 
                Block.TextAlignmentProperty.AddOwner(typeof(TableCell));
 
        /// 
        ///
        /// 
        public TextAlignment TextAlignment 
        {
            get { return (TextAlignment)GetValue(TextAlignmentProperty); } 
            set { SetValue(TextAlignmentProperty, value); } 
        }
 
        /// 
        /// DependencyProperty for  property.
        /// 
        public static readonly DependencyProperty FlowDirectionProperty = 
                Block.FlowDirectionProperty.AddOwner(typeof(TableCell));
 
        ///  
        /// The FlowDirection property specifies the flow direction of the element.
        ///  
        public FlowDirection FlowDirection
        {
            get { return (FlowDirection)GetValue(FlowDirectionProperty); }
            set { SetValue(FlowDirectionProperty, value); } 
        }
 
        ///  
        /// DependencyProperty for  property.
        ///  
        public static readonly DependencyProperty LineHeightProperty =
                Block.LineHeightProperty.AddOwner(typeof(TableCell));

        ///  
        /// The LineHeight property specifies the height of each generated line box.
        ///  
        [TypeConverter(typeof(LengthConverter))] 
        public double LineHeight
        { 
            get { return (double)GetValue(LineHeightProperty); }
            set { SetValue(LineHeightProperty, value); }
        }
 
        /// 
        /// DependencyProperty for  property. 
        ///  
        public static readonly DependencyProperty LineStackingStrategyProperty =
                Block.LineStackingStrategyProperty.AddOwner(typeof(TableCell)); 

        /// 
        /// The LineStackingStrategy property specifies how lines are placed
        ///  
        public LineStackingStrategy LineStackingStrategy
        { 
            get { return (LineStackingStrategy)GetValue(LineStackingStrategyProperty); } 
            set { SetValue(LineStackingStrategyProperty, value); }
        } 

        #endregion Block Properties

        #endregion Public Properties 

        //----------------------------------------------------- 
        // 
        //  Internal Methods
        // 
        //-----------------------------------------------------

        #region Internal Methods
 
        #region IIndexedChild implementation
        void IIndexedChild.OnEnterParentTree() 
        { 
            this.OnEnterParentTree();
        } 
        void IIndexedChild.OnExitParentTree()
        {
            this.OnExitParentTree();
        } 
        void IIndexedChild.OnAfterExitParentTree(TableRow parent)
        { 
            this.OnAfterExitParentTree(parent); 
        }
        int IIndexedChild.Index 
        {
            get { return this.Index; }
            set { this.Index = value; }
        } 
        #endregion IIndexedChild implementation
 
        ///  
        /// Callback used to notify the Cell about entering model tree.
        ///  
        internal void OnEnterParentTree()
        {
            if(Table != null)
            { 
                Table.OnStructureChanged();
            } 
        } 

        ///  
        /// Callback used to notify the RowGroup about exitting model tree.
        /// 
        internal void OnExitParentTree()
        { 
        }
 
        ///  
        /// Callback used to notify the Cell after it has exitted model tree. (Structures are all updated)
        ///  
        internal void OnAfterExitParentTree(TableRow row)
        {
            if(row.Table != null)
            { 
                row.Table.OnStructureChanged();
            } 
        } 

 
        /// 
        /// ValidateStructure -- caches column index
        /// 
        internal void ValidateStructure(int columnIndex) 
        {
            Invariant.Assert(columnIndex >= 0); 
 
            _columnIndex = columnIndex;
        } 


        #endregion Internal Methods
 
        //-----------------------------------------------------
        // 
        //  Internal Properties 
        //
        //------------------------------------------------------ 

        #region Internal Properties

        ///  
        /// Row owner accessor
        ///  
        internal TableRow Row { get { return Parent as TableRow; } } 

        ///  
        /// Table owner accessor
        /// 
        internal Table Table { get { return Row != null ? Row.Table : null; } }
 
        /// 
        /// Cell's index in the parents collection. 
        ///  
        internal int Index
        { 
            get
            {
                return (_parentIndex);
            } 
            set
            { 
                Debug.Assert(value >= -1 && _parentIndex != value); 
                _parentIndex = value;
            } 
        }

        /// 
        /// Returns cell's parenting row index. 
        /// 
        internal int RowIndex 
        { 
            get
            { 
                return (Row.Index);
            }
        }
 
        /// 
        /// Returns cell's parenting row group index. 
        ///  
        internal int RowGroupIndex
        { 
            get
            {
                return (Row.RowGroup.Index);
            } 
        }
 
        ///  
        /// Returns or sets cell's parenting column index.
        ///  
        /// 
        /// Called by the parent Row during (re)build of the StructuralCache.
        /// Change of column index causes Layout Dirtyness of the cell.
        ///  
        internal int ColumnIndex
        { 
            get 
            {
                return (_columnIndex); 
            }
            set
            {
                _columnIndex = value; 
            }
        } 
 
        /// 
        /// Marks this element's left edge as visible to IMEs. 
        /// This means element boundaries will act as word breaks.
        /// 
        internal override bool IsIMEStructuralElement
        { 
            get
            { 
                return true; 
            }
        } 

        #endregion Internal Properties

        //----------------------------------------------------- 
        //
        //  Private Methods 
        // 
        //------------------------------------------------------
 
        #region Private Methods

        /// 
        /// Private ctor time initialization. 
        /// 
        private void PrivateInitialize() 
        { 
            _parentIndex = -1;
            _columnIndex = -1; 
        }


        #endregion Private Methods 

        //------------------------------------------------------ 
        // 
        //  Private Properties
        // 
        //-----------------------------------------------------

        #region Private Properties
 
        #endregion Private Properties
 
        //------------------------------------------------------ 
        //
        //  Private Fields 
        //
        //-----------------------------------------------------

        #region Private Fields 

        private int _parentIndex;                               //  cell's index in parent's children collection 
        private int _columnIndex;                               // Column index for cell. 

        #endregion Private Fields 

        //-----------------------------------------------------
        //
        //  Properties 
        //
        //----------------------------------------------------- 
 
        #region Properties
 
        /// 
        /// Column span property.
        /// 
        public static readonly DependencyProperty ColumnSpanProperty = 
                DependencyProperty.Register(
                        "ColumnSpan", 
                        typeof(int), 
                        typeof(TableCell),
                        new FrameworkPropertyMetadata( 
                                1,
                                FrameworkPropertyMetadataOptions.AffectsMeasure,
                                new PropertyChangedCallback(OnColumnSpanChanged)),
                        new ValidateValueCallback(IsValidColumnSpan)); 

        ///  
        /// Row span property. 
        /// 
        public static readonly DependencyProperty RowSpanProperty = 
                DependencyProperty.Register(
                        "RowSpan",
                        typeof(int),
                        typeof(TableCell), 
                        new FrameworkPropertyMetadata(
                                1, 
                                FrameworkPropertyMetadataOptions.AffectsMeasure, 
                                new PropertyChangedCallback(OnRowSpanChanged)),
                        new ValidateValueCallback(IsValidRowSpan)); 

        #endregion Properties

        //------------------------------------------------------ 
        //
        //  Property Invalidation 
        // 
        //-----------------------------------------------------
 
        #region Property Invalidation

        /// 
        ///  
        /// 
        private static bool IsValidRowSpan(object value) 
        { 
            // Maximum row span is limited to 1000000. We do not have any limits from PTS or other formatting restrictions for this value.
            int span = (int)value; 
            return (span >= 1 && span <= 1000000);
        }

        ///  
        /// 
        ///  
        private static bool IsValidColumnSpan(object value) 
        {
            int span = (int)value; 
            const int maxSpan = PTS.Restrictions.tscTableColumnsRestriction;
            return (span >= 1 && span <= maxSpan);
        }
 
        /// 
        ///  
        ///  
        private static void OnColumnSpanChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        { 
            TableCell cell = (TableCell) d;

            if(cell.Table != null)
            { 
                cell.Table.OnStructureChanged();
            } 
 
            // Update AutomaitonPeer.
            TableCellAutomationPeer peer = ContentElementAutomationPeer.FromElement(cell) as TableCellAutomationPeer; 
            if (peer != null)
            {
                peer.OnColumnSpanChanged((int)e.OldValue, (int)e.NewValue);
            } 
        }
 
        ///  
        /// 
        ///  
        private static void OnRowSpanChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            TableCell cell = (TableCell) d;
 
            if(cell.Table != null)
            { 
                cell.Table.OnStructureChanged(); 
            }
 
            // Update AutomaitonPeer.
            TableCellAutomationPeer peer = ContentElementAutomationPeer.FromElement(cell) as TableCellAutomationPeer;
            if (peer != null)
            { 
                peer.OnRowSpanChanged((int)e.OldValue, (int)e.NewValue);
            } 
        } 

        #endregion Property Invalidation 
    }


 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
//---------------------------------------------------------------------------- 
//
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
//
// 
// Description: Implementation of table cell 
//
//              See spec at http://avalon/layout/Tables/WPP%20TableOM.doc 
//
// History:
//  05/19/2003 : olego - Created
// 
//  Todo list:
//  1)  OnPropertyInvalidated is expensive and requires investigation: 
//      a)  Cell calls to base class implementation which fires back tree 
//          change event - Cell.OnTextContainerChange. As a result Cell.Invalidate
//          format is called twice. 
//      b)  base.OnPropertyInvalidated *always* creates DTR for the whole cell.
//          Why even AffectsRender causes it?
//---------------------------------------------------------------------------
using MS.Internal; 
using MS.Internal.PtsHost;
using MS.Internal.PtsTable; 
using MS.Internal.Text; 
using MS.Utility;
using System.Diagnostics; 
using System.Security;
using System.Windows.Threading;
using System.Collections;
using System.Windows; 
using System.Windows.Automation.Peers;
using System.Windows.Media; 
using System.Windows.Controls; 
using System.Windows.Markup;
using System.ComponentModel; // TypeConverter 
using System.Collections.Generic;
using MS.Internal.Documents;

using System; 

using MS.Internal.PtsHost.UnsafeNativeMethods; 
 
namespace System.Windows.Documents
{ 
    /// 
    /// Implementation of table cell
    /// 
    [ContentProperty("Blocks")] 
    public class TableCell : TextElement, IIndexedChild
    { 
        //----------------------------------------------------- 
        //
        //  Constructors 
        //
        //-----------------------------------------------------

        #region Constructors 

        ///  
        /// Default constructor 
        /// 
        public TableCell() 
            : base()
        {
            PrivateInitialize();
        } 

        ///  
        /// Default constructor 
        /// 
        public TableCell(Block blockItem) 
            : base()
        {
            PrivateInitialize();
 
            if (blockItem == null)
            { 
                throw new ArgumentNullException("blockItem"); 
            }
 
            this.Blocks.Add(blockItem);
        }

        #endregion Constructors 

        //------------------------------------------------------ 
        // 
        //  Public Methods
        // 
        //-----------------------------------------------------

        #region Public Methods
 
        /// 
        /// Called when tablecell gets new parent 
        ///  
        /// 
        /// New parent of cell 
        /// 
        internal override void OnNewParent(DependencyObject newParent)
        {
            DependencyObject oldParent = this.Parent; 
            TableRow newParentTR = newParent as TableRow;
 
            if((newParent != null) && (newParentTR == null)) 
            {
                throw new InvalidOperationException(SR.Get(SRID.TableInvalidParentNodeType, newParent.GetType().ToString())); 
            }

            if(oldParent != null)
            { 
                ((TableRow)oldParent).Cells.InternalRemove(this);
            } 
 
            base.OnNewParent(newParent);
 
            if ((newParentTR != null) && (newParentTR.Cells != null)) // keep PreSharp happy
            {
                newParentTR.Cells.InternalAdd(this);
            } 
        }
 
        #endregion Public Methods 

        //------------------------------------------------------ 
        //
        //  Public Properties
        //
        //------------------------------------------------------ 

        #region Public Properties 
 
        /// 
        /// Collection of Blocks contained in this Section. 
        /// 
        [DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
        public BlockCollection Blocks
        { 
            get
            { 
                return new BlockCollection(this, /*isOwnerParent*/true); 
            }
        } 

        /// 
        /// Column span property.
        ///  
        public int ColumnSpan
        { 
            get { return (int) GetValue(ColumnSpanProperty); } 
            set { SetValue(ColumnSpanProperty, value); }
        } 

        /// 
        /// Row span property.
        ///  
        public int RowSpan
        { 
            get { return (int) GetValue(RowSpanProperty); } 
            set { SetValue(RowSpanProperty, value); }
        } 

        //-------------------------------------------------------------------
        //
        // Protected Methods 
        //
        //---------------------------------------------------------------------- 
 
        #region Protected Methods
 
        /// 
        /// Creates AutomationPeer ()
        /// 
        protected override AutomationPeer OnCreateAutomationPeer() 
        {
            return new TableCellAutomationPeer(this); 
        } 

        #endregion Protected Methods 

        //.....................................................................
        //
        // Block Properties 
        //
        //..................................................................... 
 
        #region Block Properties
 
        /// 
        /// DependencyProperty for  property.
        /// 
        public static readonly DependencyProperty PaddingProperty = 
                Block.PaddingProperty.AddOwner(
                        typeof(TableCell), 
                        new FrameworkPropertyMetadata( 
                                new Thickness(),
                                FrameworkPropertyMetadataOptions.AffectsMeasure)); 

        /// 
        /// The Padding property specifies the padding of the element.
        ///  
        public Thickness Padding
        { 
            get { return (Thickness)GetValue(PaddingProperty); } 
            set { SetValue(PaddingProperty, value); }
        } 

        /// 
        /// DependencyProperty for  property.
        ///  
        public static readonly DependencyProperty BorderThicknessProperty =
                Block.BorderThicknessProperty.AddOwner( 
                        typeof(TableCell), 
                        new FrameworkPropertyMetadata(
                                new Thickness(), 
                                FrameworkPropertyMetadataOptions.AffectsMeasure));

        /// 
        /// The BorderThickness property specifies the border of the element. 
        /// 
        public Thickness BorderThickness 
        { 
            get { return (Thickness)GetValue(BorderThicknessProperty); }
            set { SetValue(BorderThicknessProperty, value); } 
        }

        /// 
        /// DependencyProperty for  property. 
        /// 
        public static readonly DependencyProperty BorderBrushProperty = 
                Block.BorderBrushProperty.AddOwner( 
                        typeof(TableCell),
                        new FrameworkPropertyMetadata( 
                                null,
                                FrameworkPropertyMetadataOptions.AffectsRender));

        ///  
        /// The BorderBrush property specifies the brush of the border.
        ///  
        public Brush BorderBrush 
        {
            get { return (Brush)GetValue(BorderBrushProperty); } 
            set { SetValue(BorderBrushProperty, value); }
        }

        ///  
        /// DependencyProperty for  property.
        ///  
        public static readonly DependencyProperty TextAlignmentProperty = 
                Block.TextAlignmentProperty.AddOwner(typeof(TableCell));
 
        /// 
        ///
        /// 
        public TextAlignment TextAlignment 
        {
            get { return (TextAlignment)GetValue(TextAlignmentProperty); } 
            set { SetValue(TextAlignmentProperty, value); } 
        }
 
        /// 
        /// DependencyProperty for  property.
        /// 
        public static readonly DependencyProperty FlowDirectionProperty = 
                Block.FlowDirectionProperty.AddOwner(typeof(TableCell));
 
        ///  
        /// The FlowDirection property specifies the flow direction of the element.
        ///  
        public FlowDirection FlowDirection
        {
            get { return (FlowDirection)GetValue(FlowDirectionProperty); }
            set { SetValue(FlowDirectionProperty, value); } 
        }
 
        ///  
        /// DependencyProperty for  property.
        ///  
        public static readonly DependencyProperty LineHeightProperty =
                Block.LineHeightProperty.AddOwner(typeof(TableCell));

        ///  
        /// The LineHeight property specifies the height of each generated line box.
        ///  
        [TypeConverter(typeof(LengthConverter))] 
        public double LineHeight
        { 
            get { return (double)GetValue(LineHeightProperty); }
            set { SetValue(LineHeightProperty, value); }
        }
 
        /// 
        /// DependencyProperty for  property. 
        ///  
        public static readonly DependencyProperty LineStackingStrategyProperty =
                Block.LineStackingStrategyProperty.AddOwner(typeof(TableCell)); 

        /// 
        /// The LineStackingStrategy property specifies how lines are placed
        ///  
        public LineStackingStrategy LineStackingStrategy
        { 
            get { return (LineStackingStrategy)GetValue(LineStackingStrategyProperty); } 
            set { SetValue(LineStackingStrategyProperty, value); }
        } 

        #endregion Block Properties

        #endregion Public Properties 

        //----------------------------------------------------- 
        // 
        //  Internal Methods
        // 
        //-----------------------------------------------------

        #region Internal Methods
 
        #region IIndexedChild implementation
        void IIndexedChild.OnEnterParentTree() 
        { 
            this.OnEnterParentTree();
        } 
        void IIndexedChild.OnExitParentTree()
        {
            this.OnExitParentTree();
        } 
        void IIndexedChild.OnAfterExitParentTree(TableRow parent)
        { 
            this.OnAfterExitParentTree(parent); 
        }
        int IIndexedChild.Index 
        {
            get { return this.Index; }
            set { this.Index = value; }
        } 
        #endregion IIndexedChild implementation
 
        ///  
        /// Callback used to notify the Cell about entering model tree.
        ///  
        internal void OnEnterParentTree()
        {
            if(Table != null)
            { 
                Table.OnStructureChanged();
            } 
        } 

        ///  
        /// Callback used to notify the RowGroup about exitting model tree.
        /// 
        internal void OnExitParentTree()
        { 
        }
 
        ///  
        /// Callback used to notify the Cell after it has exitted model tree. (Structures are all updated)
        ///  
        internal void OnAfterExitParentTree(TableRow row)
        {
            if(row.Table != null)
            { 
                row.Table.OnStructureChanged();
            } 
        } 

 
        /// 
        /// ValidateStructure -- caches column index
        /// 
        internal void ValidateStructure(int columnIndex) 
        {
            Invariant.Assert(columnIndex >= 0); 
 
            _columnIndex = columnIndex;
        } 


        #endregion Internal Methods
 
        //-----------------------------------------------------
        // 
        //  Internal Properties 
        //
        //------------------------------------------------------ 

        #region Internal Properties

        ///  
        /// Row owner accessor
        ///  
        internal TableRow Row { get { return Parent as TableRow; } } 

        ///  
        /// Table owner accessor
        /// 
        internal Table Table { get { return Row != null ? Row.Table : null; } }
 
        /// 
        /// Cell's index in the parents collection. 
        ///  
        internal int Index
        { 
            get
            {
                return (_parentIndex);
            } 
            set
            { 
                Debug.Assert(value >= -1 && _parentIndex != value); 
                _parentIndex = value;
            } 
        }

        /// 
        /// Returns cell's parenting row index. 
        /// 
        internal int RowIndex 
        { 
            get
            { 
                return (Row.Index);
            }
        }
 
        /// 
        /// Returns cell's parenting row group index. 
        ///  
        internal int RowGroupIndex
        { 
            get
            {
                return (Row.RowGroup.Index);
            } 
        }
 
        ///  
        /// Returns or sets cell's parenting column index.
        ///  
        /// 
        /// Called by the parent Row during (re)build of the StructuralCache.
        /// Change of column index causes Layout Dirtyness of the cell.
        ///  
        internal int ColumnIndex
        { 
            get 
            {
                return (_columnIndex); 
            }
            set
            {
                _columnIndex = value; 
            }
        } 
 
        /// 
        /// Marks this element's left edge as visible to IMEs. 
        /// This means element boundaries will act as word breaks.
        /// 
        internal override bool IsIMEStructuralElement
        { 
            get
            { 
                return true; 
            }
        } 

        #endregion Internal Properties

        //----------------------------------------------------- 
        //
        //  Private Methods 
        // 
        //------------------------------------------------------
 
        #region Private Methods

        /// 
        /// Private ctor time initialization. 
        /// 
        private void PrivateInitialize() 
        { 
            _parentIndex = -1;
            _columnIndex = -1; 
        }


        #endregion Private Methods 

        //------------------------------------------------------ 
        // 
        //  Private Properties
        // 
        //-----------------------------------------------------

        #region Private Properties
 
        #endregion Private Properties
 
        //------------------------------------------------------ 
        //
        //  Private Fields 
        //
        //-----------------------------------------------------

        #region Private Fields 

        private int _parentIndex;                               //  cell's index in parent's children collection 
        private int _columnIndex;                               // Column index for cell. 

        #endregion Private Fields 

        //-----------------------------------------------------
        //
        //  Properties 
        //
        //----------------------------------------------------- 
 
        #region Properties
 
        /// 
        /// Column span property.
        /// 
        public static readonly DependencyProperty ColumnSpanProperty = 
                DependencyProperty.Register(
                        "ColumnSpan", 
                        typeof(int), 
                        typeof(TableCell),
                        new FrameworkPropertyMetadata( 
                                1,
                                FrameworkPropertyMetadataOptions.AffectsMeasure,
                                new PropertyChangedCallback(OnColumnSpanChanged)),
                        new ValidateValueCallback(IsValidColumnSpan)); 

        ///  
        /// Row span property. 
        /// 
        public static readonly DependencyProperty RowSpanProperty = 
                DependencyProperty.Register(
                        "RowSpan",
                        typeof(int),
                        typeof(TableCell), 
                        new FrameworkPropertyMetadata(
                                1, 
                                FrameworkPropertyMetadataOptions.AffectsMeasure, 
                                new PropertyChangedCallback(OnRowSpanChanged)),
                        new ValidateValueCallback(IsValidRowSpan)); 

        #endregion Properties

        //------------------------------------------------------ 
        //
        //  Property Invalidation 
        // 
        //-----------------------------------------------------
 
        #region Property Invalidation

        /// 
        ///  
        /// 
        private static bool IsValidRowSpan(object value) 
        { 
            // Maximum row span is limited to 1000000. We do not have any limits from PTS or other formatting restrictions for this value.
            int span = (int)value; 
            return (span >= 1 && span <= 1000000);
        }

        ///  
        /// 
        ///  
        private static bool IsValidColumnSpan(object value) 
        {
            int span = (int)value; 
            const int maxSpan = PTS.Restrictions.tscTableColumnsRestriction;
            return (span >= 1 && span <= maxSpan);
        }
 
        /// 
        ///  
        ///  
        private static void OnColumnSpanChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        { 
            TableCell cell = (TableCell) d;

            if(cell.Table != null)
            { 
                cell.Table.OnStructureChanged();
            } 
 
            // Update AutomaitonPeer.
            TableCellAutomationPeer peer = ContentElementAutomationPeer.FromElement(cell) as TableCellAutomationPeer; 
            if (peer != null)
            {
                peer.OnColumnSpanChanged((int)e.OldValue, (int)e.NewValue);
            } 
        }
 
        ///  
        /// 
        ///  
        private static void OnRowSpanChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            TableCell cell = (TableCell) d;
 
            if(cell.Table != null)
            { 
                cell.Table.OnStructureChanged(); 
            }
 
            // Update AutomaitonPeer.
            TableCellAutomationPeer peer = ContentElementAutomationPeer.FromElement(cell) as TableCellAutomationPeer;
            if (peer != null)
            { 
                peer.OnRowSpanChanged((int)e.OldValue, (int)e.NewValue);
            } 
        } 

        #endregion Property Invalidation 
    }


 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
                        

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