DataGridViewCellLinkedList.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / WinForms / Managed / System / WinForms / DataGridViewCellLinkedList.cs / 1305376 / DataGridViewCellLinkedList.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Windows.Forms 
{ 
    using System;
    using System.Diagnostics; 
    using System.Collections;
    using System.Windows.Forms;
    using System.ComponentModel;
 
    /// 
    ///  
    /// Represents a linked list of  objects 
    /// 
    internal class DataGridViewCellLinkedList : IEnumerable 
    {
        private DataGridViewCellLinkedListElement lastAccessedElement;
        private DataGridViewCellLinkedListElement headElement;
        private int count, lastAccessedIndex; 

        ///  
        IEnumerator IEnumerable.GetEnumerator() 
        {
            return new DataGridViewCellLinkedListEnumerator(this.headElement); 
        }

        /// 
        public DataGridViewCellLinkedList() 
        {
            this.lastAccessedIndex = -1; 
        } 

        ///  
        public DataGridViewCell this[int index]
        {
            get
            { 
                Debug.Assert(index >= 0);
                Debug.Assert(index < this.count); 
                if (this.lastAccessedIndex == -1 || index < this.lastAccessedIndex) 
                {
                    DataGridViewCellLinkedListElement tmp = this.headElement; 
                    int tmpIndex = index;
                    while (tmpIndex > 0)
                    {
                        tmp = tmp.Next; 
                        tmpIndex--;
                    } 
                    this.lastAccessedElement = tmp; 
                    this.lastAccessedIndex = index;
                    return tmp.DataGridViewCell; 
                }
                else
                {
                    while (this.lastAccessedIndex < index) 
                    {
                        this.lastAccessedElement = this.lastAccessedElement.Next; 
                        this.lastAccessedIndex++; 
                    }
                    return this.lastAccessedElement.DataGridViewCell; 
                }
            }
        }
 
        /// 
        public int Count 
        { 
            get
            { 
                return this.count;
            }
        }
 
        /// 
        public DataGridViewCell HeadCell 
        { 
            get
            { 
                Debug.Assert(this.headElement != null);
                return this.headElement.DataGridViewCell;
            }
        } 

        ///  
        public void Add(DataGridViewCell dataGridViewCell) 
        {
            Debug.Assert(dataGridViewCell != null); 
            Debug.Assert(dataGridViewCell.DataGridView.SelectionMode == DataGridViewSelectionMode.CellSelect ||
                         dataGridViewCell.DataGridView.SelectionMode == DataGridViewSelectionMode.ColumnHeaderSelect ||
                         dataGridViewCell.DataGridView.SelectionMode == DataGridViewSelectionMode.RowHeaderSelect);
            DataGridViewCellLinkedListElement newHead = new DataGridViewCellLinkedListElement(dataGridViewCell); 
            if (this.headElement != null)
            { 
                newHead.Next = this.headElement; 
            }
            this.headElement = newHead; 
            this.count++;
            this.lastAccessedElement = null;
            this.lastAccessedIndex = -1;
        } 

        ///  
        public void Clear() 
        {
            this.lastAccessedElement = null; 
            this.lastAccessedIndex = -1;
            this.headElement = null;
            this.count = 0;
        } 

        ///  
        public bool Contains(DataGridViewCell dataGridViewCell) 
        {
            Debug.Assert(dataGridViewCell != null); 
            int index = 0;
            DataGridViewCellLinkedListElement tmp = this.headElement;
            while (tmp != null)
            { 
                if (tmp.DataGridViewCell == dataGridViewCell)
                { 
                    this.lastAccessedElement = tmp; 
                    this.lastAccessedIndex = index;
                    return true; 
                }
                tmp = tmp.Next;
                index++;
            } 
            return false;
        } 
 
        /// 
        public bool Remove(DataGridViewCell dataGridViewCell) 
        {
            Debug.Assert(dataGridViewCell != null);
            DataGridViewCellLinkedListElement tmp1 = null, tmp2 = this.headElement;
            while (tmp2 != null) 
            {
                if (tmp2.DataGridViewCell == dataGridViewCell) 
                { 
                    break;
                } 
                tmp1 = tmp2;
                tmp2 = tmp2.Next;
            }
            if (tmp2.DataGridViewCell == dataGridViewCell) 
            {
                DataGridViewCellLinkedListElement tmp3 = tmp2.Next; 
                if (tmp1 == null) 
                {
                    this.headElement = tmp3; 
                }
                else
                {
                    tmp1.Next = tmp3; 
                }
                this.count--; 
                this.lastAccessedElement = null; 
                this.lastAccessedIndex = -1;
                return true; 
            }
            return false;
        }
 
        /* Unused for now
        ///  
        public DataGridViewCell RemoveHead() 
        {
            if (this.headElement == null) 
            {
                return null;
            }
            DataGridViewCellLinkedListElement tmp = this.headElement; 
            this.headElement = tmp.Next;
            this.count--; 
            this.lastAccessedElement = null; 
            this.lastAccessedIndex = -1;
            return tmp.DataGridViewCell; 
        }
        */

        ///  
        public int RemoveAllCellsAtBand(bool column, int bandIndex)
        { 
            int removedCount = 0; 
            DataGridViewCellLinkedListElement tmp1 = null, tmp2 = this.headElement;
            while (tmp2 != null) 
            {
                if ((column && tmp2.DataGridViewCell.ColumnIndex == bandIndex) ||
                    (!column && tmp2.DataGridViewCell.RowIndex == bandIndex))
                { 
                    DataGridViewCellLinkedListElement tmp3 = tmp2.Next;
                    if (tmp1 == null) 
                    { 
                        this.headElement = tmp3;
                    } 
                    else
                    {
                        tmp1.Next = tmp3;
                    } 
                    tmp2 = tmp3;
                    this.count--; 
                    this.lastAccessedElement = null; 
                    this.lastAccessedIndex = -1;
                    removedCount++; 
                }
                else
                {
                    tmp1 = tmp2; 
                    tmp2 = tmp2.Next;
                } 
            } 
            return removedCount;
        } 
    }

    /// 
    ///  
    /// Represents an emunerator of elements in a   linked list.
    ///  
    internal class DataGridViewCellLinkedListEnumerator : IEnumerator 
    {
        private DataGridViewCellLinkedListElement headElement; 
        private DataGridViewCellLinkedListElement current;
        private bool reset;

        ///  
        public DataGridViewCellLinkedListEnumerator(DataGridViewCellLinkedListElement headElement)
        { 
            this.headElement = headElement; 
            this.reset = true;
        } 

        /// 
        object IEnumerator.Current
        { 
            get
            { 
                Debug.Assert(this.current != null); // Since this is for internal use only. 
                return this.current.DataGridViewCell;
            } 
        }

        /// 
        bool IEnumerator.MoveNext() 
        {
            if (this.reset) 
            { 
                Debug.Assert(this.current == null);
                this.current = this.headElement; 
                this.reset = false;
            }
            else
            { 
                Debug.Assert(this.current != null); // Since this is for internal use only.
                this.current = this.current.Next; 
            } 
            return (this.current != null);
        } 

        /// 
        void IEnumerator.Reset()
        { 
            this.reset = true;
            this.current = null; 
        } 
    }
 
    /// 
    /// 
    /// Represents an element in a  linked list.
    ///  
    internal class DataGridViewCellLinkedListElement
    { 
        private DataGridViewCell dataGridViewCell; 
        private DataGridViewCellLinkedListElement next;
 
        /// 
        public DataGridViewCellLinkedListElement(DataGridViewCell dataGridViewCell)
        {
            Debug.Assert(dataGridViewCell != null); 
            this.dataGridViewCell = dataGridViewCell;
        } 
 
        /// 
        public DataGridViewCell DataGridViewCell 
        {
            get
            {
                return this.dataGridViewCell; 
            }
        } 
 
        /// 
        public DataGridViewCellLinkedListElement Next 
        {
            get
            {
                return this.next; 
            }
            set 
            { 
                this.next = value;
            } 
        }
    }
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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DataGridViewCellLinkedList.cs source code in C# .NET

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