Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / MS / Internal / PtsTable / RowSpanVector.cs / 1305600 / 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. 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