RowSpanVector.cs source code in C# .NET

                        Code:
                         / Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / Orcas / SP / wpf / src / Framework / MS / Internal / PtsTable / RowSpanVector.cs / 1 / RowSpanVector.cs
                        
                        
                            //---------------------------------------------------------------------------- 
//
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
//
// 
// Description: Implementation of Row Span Vector. 
//
// History: 
//  06/19/2003 : olego - Created
//
//---------------------------------------------------------------------------
 
using System;
using System.Diagnostics; 
using System.Windows.Documents; 

namespace MS.Internal.PtsTable 
{
    /// 
    /// Implementation of Row Span Vector.
    ///  
    /// 
    /// Each row span cell in a table goes through row span vector. 
    /// RowSpanVector play several roles: 
    /// * it transfers information about row spanning cells from a row
    ///   to the next row during structural cache validation; 
    /// * it provides information about available ranges, in which cells
    ///   are positioned;
    /// * at the end of row validation RowSpanVector prepares array of
    ///   row spanned cells that start, end or go through the row; 
    /// 
    internal sealed class RowSpanVector 
    { 
        //-----------------------------------------------------
        // 
        //  Constructors
        //
        //-----------------------------------------------------
 
        #region Constructors
 
        ///  
        /// Default constructor
        ///  
        internal RowSpanVector()
        {
            _entries = new Entry[c_defaultCapacity];
 
            // add the barrier element
            _entries[0].Cell = null; 
            _entries[0].Start = int.MaxValue / 2; 
            _entries[0].Range = int.MaxValue / 2;
            _entries[0].Ttl = int.MaxValue; 
            _size = 1;

            #if DEBUG
            _index = -1; 
            #endif // DEBUG
        } 
 
        #endregion Constructors
 
        //------------------------------------------------------
        //
        //  Internal Methods
        // 
        //-----------------------------------------------------
 
        #region Internal Methods 

        ///  
        /// Registers the cell by creating a dirty range and inserting it into
        /// existing dirty range list.
        /// 
        /// Reference to cell 
        internal void Register(TableCell cell)
        { 
            int start = cell.ColumnIndex; 

            #if DEBUG 
            Debug.Assert(cell != null
                        &&  cell.ColumnIndex != -1
                        &&  cell.RowSpan > 1
                        &&  _index != -1    ); 

            // assert there is no register record with this index 
            for (int i = _size - 2; i >= 0; --i) 
            {
                Debug.Assert(   start < _entries[i].Cell.ColumnIndex 
                            ||  start >= _entries[i].Cell.ColumnIndex + _entries[i].Cell.ColumnSpan);
            }

            //  assert that the position for the element being inserted 
            //  is correct
            Debug.Assert(_index < _size); 
            Debug.Assert(_index == 0 || _entries[_index - 1].Start < start); 
            Debug.Assert(start < _entries[_index].Start);
#endif // DEBUG 

            //  check if array of entries has enough capacity to hold another entry
            if (_size == _entries.Length)
            { 
                InflateCapacity();
            } 
 
            //  insert
            for (int i = _size - 1; i >= _index; --i) 
            {
                _entries[i + 1] = _entries[i];
            }
 
            _entries[_index].Cell = cell;
            _entries[_index].Start = start; 
            _entries[_index].Range = cell.ColumnSpan; 
            _entries[_index].Ttl = cell.RowSpan - 1;
            _size++; 
            _index++;
        }

        ///  
        /// Returns the first empty range of indices
        ///  
        /// First availalbe index 
        /// First occupied index
        internal void GetFirstAvailableRange(out int firstAvailableIndex, out int firstOccupiedIndex) 
        {
            _index = 0;
            firstAvailableIndex = 0;
            firstOccupiedIndex = _entries[_index].Start; 
        }
 
        ///  
        /// Returns the next empty range of indices
        ///  
        /// First availalbe index
        /// First occupied index
        /// 
        /// Side effect: updates ttl counter 
        /// 
        internal void GetNextAvailableRange(out int firstAvailableIndex, out int firstOccupiedIndex) 
        { 
            //  calculate first available index
            Debug.Assert(0 <= _index && _index < _size); 
            firstAvailableIndex = _entries[_index].Start + _entries[_index].Range;

            //  update ttl counter
            _entries[_index].Ttl--; 

            //  calculate first occupied index 
            _index++; 
            Debug.Assert(0 <= _index && _index < _size);
            firstOccupiedIndex = _entries[_index].Start; 
        }

        /// 
        /// Returns array of spanned cells 
        /// 
        /// Spanned cells 
        /// Whether the current span has the last row of any span 
        /// Array of cells. May be empty
        internal void GetSpanCells(out TableCell[] cells, out bool isLastRowOfAnySpan) 
        {
            cells = s_noCells;
            isLastRowOfAnySpan = false;
 
            //  iterate the tail of entries (if any)
            //  update ttl counter 
            while (_index < _size) 
            {
                _entries[_index].Ttl--; 
                _index++;
            }

            //  * copy surviving entries (if any) into array 
            //  * remove expired entries
            if (_size > 1) 
            { 
                cells = new TableCell[_size - 1];
 
                int i = 0, j = 0;

                do
                { 
                    Debug.Assert(_entries[i].Cell != null);
                    Debug.Assert(i >= j); 
 
                    cells[i] = _entries[i].Cell;
 
                    if (_entries[i].Ttl > 0)
                    {
                        if (i != j)
                        { 
                            _entries[j] = _entries[i];
                        } 
 
                        j++;
                    } 

                    i++;
                } while (i < _size - 1);
 
                //  take care of the barrier entry
                if (i != j) 
                { 
                    _entries[j] = _entries[i];
                    isLastRowOfAnySpan = true; 
                }

                _size = j + 1;
            } 

            #if DEBUG 
            _index = -1; 
            #endif // DEBUG
        } 

        #endregion Internal Methods

        //------------------------------------------------------ 
        //
        //  Internal Properties 
        // 
        //------------------------------------------------------
 
        #region Internal Properties

        /// 
        /// Returns "true" when there is no registered cells in the vector 
        /// 
        /// Returns "true" when there is no registered cells in the vector 
        internal bool Empty() 
        {
            return (_size == 1); 
        }

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

        #region Private Methods

        ///  
        /// Increases capacity of the internal array by the factor of 2
        ///  
        private void InflateCapacity() 
        {
            Debug.Assert(   _entries.Length > 0 
                        &&  _size <= _entries.Length    );

            Entry[] newEntries = new Entry[_entries.Length * 2];
            Array.Copy(_entries, newEntries, _entries.Length); 
            _entries = newEntries;
        } 
 
        #endregion Private Methods
 
        //-----------------------------------------------------
        //
        //  Private Fields
        // 
        //-----------------------------------------------------
 
        #region Private Fields 
        private Entry[] _entries;                       //  dirty range list
        private int _size;                              //  current size of the list 
        private int _index;                             //  index used for iteration (GetFirst / GetNext)
        private const int c_defaultCapacity = 8;        //  default capacity
        private static TableCell[] s_noCells = new TableCell[0];  //  empty array RowSpanVector returns to rows that do not
                                                        //  have row spanned cells 
        #endregion Private Fields
 
        //----------------------------------------------------- 
        //
        //  Private Structures / Classes 
        //
        //------------------------------------------------------

        #region Private Structures Classes 

        ///  
        /// Dirty range entry 
        /// 
        private struct Entry 
        {
            internal TableCell Cell;     //  reference to object (cell)
            internal int Start;     //  first dirty index
            internal int Range;     //  number of dirty indices (right after Start) 
            internal int Ttl;       //  time to live counter
        } 
 
        #endregion Private Structures Classes
    } 
}

// 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 Row Span Vector. 
//
// History: 
//  06/19/2003 : olego - Created
//
//---------------------------------------------------------------------------
 
using System;
using System.Diagnostics; 
using System.Windows.Documents; 

namespace MS.Internal.PtsTable 
{
    /// 
    /// Implementation of Row Span Vector.
    ///  
    /// 
    /// Each row span cell in a table goes through row span vector. 
    /// RowSpanVector play several roles: 
    /// * it transfers information about row spanning cells from a row
    ///   to the next row during structural cache validation; 
    /// * it provides information about available ranges, in which cells
    ///   are positioned;
    /// * at the end of row validation RowSpanVector prepares array of
    ///   row spanned cells that start, end or go through the row; 
    /// 
    internal sealed class RowSpanVector 
    { 
        //-----------------------------------------------------
        // 
        //  Constructors
        //
        //-----------------------------------------------------
 
        #region Constructors
 
        ///  
        /// Default constructor
        ///  
        internal RowSpanVector()
        {
            _entries = new Entry[c_defaultCapacity];
 
            // add the barrier element
            _entries[0].Cell = null; 
            _entries[0].Start = int.MaxValue / 2; 
            _entries[0].Range = int.MaxValue / 2;
            _entries[0].Ttl = int.MaxValue; 
            _size = 1;

            #if DEBUG
            _index = -1; 
            #endif // DEBUG
        } 
 
        #endregion Constructors
 
        //------------------------------------------------------
        //
        //  Internal Methods
        // 
        //-----------------------------------------------------
 
        #region Internal Methods 

        ///  
        /// Registers the cell by creating a dirty range and inserting it into
        /// existing dirty range list.
        /// 
        /// Reference to cell 
        internal void Register(TableCell cell)
        { 
            int start = cell.ColumnIndex; 

            #if DEBUG 
            Debug.Assert(cell != null
                        &&  cell.ColumnIndex != -1
                        &&  cell.RowSpan > 1
                        &&  _index != -1    ); 

            // assert there is no register record with this index 
            for (int i = _size - 2; i >= 0; --i) 
            {
                Debug.Assert(   start < _entries[i].Cell.ColumnIndex 
                            ||  start >= _entries[i].Cell.ColumnIndex + _entries[i].Cell.ColumnSpan);
            }

            //  assert that the position for the element being inserted 
            //  is correct
            Debug.Assert(_index < _size); 
            Debug.Assert(_index == 0 || _entries[_index - 1].Start < start); 
            Debug.Assert(start < _entries[_index].Start);
#endif // DEBUG 

            //  check if array of entries has enough capacity to hold another entry
            if (_size == _entries.Length)
            { 
                InflateCapacity();
            } 
 
            //  insert
            for (int i = _size - 1; i >= _index; --i) 
            {
                _entries[i + 1] = _entries[i];
            }
 
            _entries[_index].Cell = cell;
            _entries[_index].Start = start; 
            _entries[_index].Range = cell.ColumnSpan; 
            _entries[_index].Ttl = cell.RowSpan - 1;
            _size++; 
            _index++;
        }

        ///  
        /// Returns the first empty range of indices
        ///  
        /// First availalbe index 
        /// First occupied index
        internal void GetFirstAvailableRange(out int firstAvailableIndex, out int firstOccupiedIndex) 
        {
            _index = 0;
            firstAvailableIndex = 0;
            firstOccupiedIndex = _entries[_index].Start; 
        }
 
        ///  
        /// Returns the next empty range of indices
        ///  
        /// First availalbe index
        /// First occupied index
        /// 
        /// Side effect: updates ttl counter 
        /// 
        internal void GetNextAvailableRange(out int firstAvailableIndex, out int firstOccupiedIndex) 
        { 
            //  calculate first available index
            Debug.Assert(0 <= _index && _index < _size); 
            firstAvailableIndex = _entries[_index].Start + _entries[_index].Range;

            //  update ttl counter
            _entries[_index].Ttl--; 

            //  calculate first occupied index 
            _index++; 
            Debug.Assert(0 <= _index && _index < _size);
            firstOccupiedIndex = _entries[_index].Start; 
        }

        /// 
        /// Returns array of spanned cells 
        /// 
        /// Spanned cells 
        /// Whether the current span has the last row of any span 
        /// Array of cells. May be empty
        internal void GetSpanCells(out TableCell[] cells, out bool isLastRowOfAnySpan) 
        {
            cells = s_noCells;
            isLastRowOfAnySpan = false;
 
            //  iterate the tail of entries (if any)
            //  update ttl counter 
            while (_index < _size) 
            {
                _entries[_index].Ttl--; 
                _index++;
            }

            //  * copy surviving entries (if any) into array 
            //  * remove expired entries
            if (_size > 1) 
            { 
                cells = new TableCell[_size - 1];
 
                int i = 0, j = 0;

                do
                { 
                    Debug.Assert(_entries[i].Cell != null);
                    Debug.Assert(i >= j); 
 
                    cells[i] = _entries[i].Cell;
 
                    if (_entries[i].Ttl > 0)
                    {
                        if (i != j)
                        { 
                            _entries[j] = _entries[i];
                        } 
 
                        j++;
                    } 

                    i++;
                } while (i < _size - 1);
 
                //  take care of the barrier entry
                if (i != j) 
                { 
                    _entries[j] = _entries[i];
                    isLastRowOfAnySpan = true; 
                }

                _size = j + 1;
            } 

            #if DEBUG 
            _index = -1; 
            #endif // DEBUG
        } 

        #endregion Internal Methods

        //------------------------------------------------------ 
        //
        //  Internal Properties 
        // 
        //------------------------------------------------------
 
        #region Internal Properties

        /// 
        /// Returns "true" when there is no registered cells in the vector 
        /// 
        /// Returns "true" when there is no registered cells in the vector 
        internal bool Empty() 
        {
            return (_size == 1); 
        }

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

        #region Private Methods

        ///  
        /// Increases capacity of the internal array by the factor of 2
        ///  
        private void InflateCapacity() 
        {
            Debug.Assert(   _entries.Length > 0 
                        &&  _size <= _entries.Length    );

            Entry[] newEntries = new Entry[_entries.Length * 2];
            Array.Copy(_entries, newEntries, _entries.Length); 
            _entries = newEntries;
        } 
 
        #endregion Private Methods
 
        //-----------------------------------------------------
        //
        //  Private Fields
        // 
        //-----------------------------------------------------
 
        #region Private Fields 
        private Entry[] _entries;                       //  dirty range list
        private int _size;                              //  current size of the list 
        private int _index;                             //  index used for iteration (GetFirst / GetNext)
        private const int c_defaultCapacity = 8;        //  default capacity
        private static TableCell[] s_noCells = new TableCell[0];  //  empty array RowSpanVector returns to rows that do not
                                                        //  have row spanned cells 
        #endregion Private Fields
 
        //----------------------------------------------------- 
        //
        //  Private Structures / Classes 
        //
        //------------------------------------------------------

        #region Private Structures Classes 

        ///  
        /// Dirty range entry 
        /// 
        private struct Entry 
        {
            internal TableCell Cell;     //  reference to object (cell)
            internal int Start;     //  first dirty index
            internal int Range;     //  number of dirty indices (right after Start) 
            internal int Ttl;       //  time to live counter
        } 
 
        #endregion Private Structures Classes
    } 
}

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