ArrangedElementCollection.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / WinForms / Managed / System / WinForms / Layout / ArrangedElementCollection.cs / 1 / ArrangedElementCollection.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Windows.Forms.Layout { 
 
    using System.Collections;
    using System.Security.Permissions; 

    /// 
    public class ArrangedElementCollection : IList
    { 
        internal static ArrangedElementCollection Empty = new ArrangedElementCollection(0);
 
        // We wrap an ArrayList rather than inherit from CollectionBase because we 
        // do not want to break binary compatibility with ControlCollection.
        private ArrayList _innerList; 

        // Internal constructor prevents externals from getting a hold of one of these.
        // We'll open this up in Orcas.
        internal ArrangedElementCollection() { 
            _innerList = new ArrayList(4);
        } 
 
        internal ArrangedElementCollection(ArrayList innerList) {
            _innerList = innerList; 
        }

        private ArrangedElementCollection(int size) {
            _innerList = new ArrayList(size); 
        }
 
        internal ArrayList InnerList { 
            get { return _innerList; }
        } 

        internal virtual IArrangedElement this[int index] {
            get { return (IArrangedElement) InnerList[index]; }
        } 

        ///  
        public override bool Equals(object obj) { 
            ArrangedElementCollection other = obj as ArrangedElementCollection;
 
            if (other == null || Count != other.Count) {
                return false;
            }
 
            for (int i = 0; i < Count; i++) {
                if (this.InnerList[i] != other.InnerList[i]) { 
                    return false; 
                }
            } 
            return true;
        }

        // Required if you override Equals. 
        /// 
        public override int GetHashCode() { return base.GetHashCode(); } 
 
        // Repositions a element in this list.
        internal void MoveElement(IArrangedElement element, int fromIndex, int toIndex) { 
            int delta = toIndex - fromIndex;

            switch (delta) {
                case -1: 
                case 1:
                    // simple swap 
                    this.InnerList[fromIndex] = this.InnerList[toIndex]; 
                    break;
 
                default:
                    int start = 0;
                    int dest = 0;
 
                    // which direction are we moving?
                    if (delta > 0) { 
                        // shift down by the delta to open the new spot 
                        start = fromIndex + 1;
                        dest = fromIndex; 
                    }
                    else {
                        // shift up by the delta to open the new spot
                        start = toIndex; 
                        dest = toIndex + 1;
 
                        // make it positive 
                        delta = -delta;
                    } 
                    Copy(this, start, this, dest, delta);
                    break;
            }
            this.InnerList[toIndex] = element; 
        }
 
        private static void Copy (ArrangedElementCollection sourceList, int sourceIndex, ArrangedElementCollection destinationList, int destinationIndex, int  length) { 
            if(sourceIndex < destinationIndex) {
                // We need to copy from the back forward to prevent overwrite if source and 
                // destination lists are the same, so we need to flip the source/dest indices
                // to point at the end of the spans to be copied.
                sourceIndex = sourceIndex + length;
                destinationIndex = destinationIndex + length; 

                for(;length > 0; length--) { 
                    destinationList.InnerList[--destinationIndex] = sourceList.InnerList[--sourceIndex]; 
                }
            } else { 
                for(;length > 0; length--) {
                    destinationList.InnerList[destinationIndex++] = sourceList.InnerList[sourceIndex++];
                }
            } 
        }
 
        #region IList Members 
        void IList.Clear() { InnerList.Clear(); }
        bool IList.IsFixedSize { get { return InnerList.IsFixedSize; }} 
        bool IList.Contains(object value) { return InnerList.Contains(value); }
        /// 
        public virtual bool IsReadOnly { get { return InnerList.IsReadOnly; }}
        void IList.RemoveAt(int index) { InnerList.RemoveAt(index); } 
        void IList.Remove(object value) { InnerList.Remove(value); }
        int IList.Add(object value) { return InnerList.Add(value); } 
        int IList.IndexOf(object value) { return InnerList.IndexOf(value); } 
        void IList.Insert(int index, object value) { throw new NotSupportedException(); /* InnerList.Insert(index, value); */ }
 
        /// 
        /// 
        object IList.this[int index] {
            get { return InnerList[index]; } 
            set { throw new NotSupportedException(); }
        } 
        #endregion 

        #region ICollection Members 
        /// 
        public virtual int Count { get { return InnerList.Count; }}
        object ICollection.SyncRoot { get { return InnerList.SyncRoot; }}
        ///  
        public void CopyTo(Array array, int index) { InnerList.CopyTo(array, index); }
        bool ICollection.IsSynchronized { get { return InnerList.IsSynchronized; }} 
        #endregion 

        #region IEnumerable Members 
        /// 
        public virtual IEnumerator GetEnumerator() { return InnerList.GetEnumerator(); }
        #endregion
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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ArrangedElementCollection.cs source code in C# .NET

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