TableCell.cs source code in C# .NET

Source code for the .NET framework in C#

                        

Code:

/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / Orcas / SP / wpf / src / Framework / System / Windows / Documents / TableCell.cs / 1 / 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;

using MS.Internal.PtsHost.UnsafeNativeMethods; 

namespace System.Windows.Documents 
{ 
    /// 
    /// Implementation of table cell 
    /// 
    [ContentProperty("Blocks")]
    public class TableCell : TextElement
    { 
        //-----------------------------------------------------
        // 
        //  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

        /// 
        /// 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;

using MS.Internal.PtsHost.UnsafeNativeMethods; 

namespace System.Windows.Documents 
{ 
    /// 
    /// Implementation of table cell 
    /// 
    [ContentProperty("Blocks")]
    public class TableCell : TextElement
    { 
        //-----------------------------------------------------
        // 
        //  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

        /// 
        /// 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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