InputGestureCollection.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Core / System / Windows / Input / Command / InputGestureCollection.cs / 1 / InputGestureCollection.cs
                        
                        
                            //---------------------------------------------------------------------------- 
//
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
//
// 
// Description: InputGestureCollection serves the purpose of Storing/Retrieving InputGestures 
//
//              See spec at : [....]/coreui/Specs/Commanding(new).mht 
//
// History:
//     03/30/2004 : [....] - Created
// 
//---------------------------------------------------------------------------
 
using System; 
using System.Collections;
using System.Diagnostics; 
using System.Collections.Generic;
using System.Windows;

using SR=MS.Internal.PresentationCore.SR; 
using SRID=MS.Internal.PresentationCore.SRID;
 
namespace System.Windows.Input 
{
    ///  
    /// InputGestureCollection
    /// InputGestureCollection - Collection of InputGestures.
    ///     Stores the InputGestures sequentially in a genric InputGesture List
    ///     Will be changed to generic List implementation once the 
    ///     parser supports generic collections.
    ///  
    public sealed class InputGestureCollection : IList 
    {
        //----------------------------------------------------- 
        //
        //  Constructors
        //
        //----------------------------------------------------- 
#region Constructors
        ///  
        /// Constructor 
        /// 
        public InputGestureCollection() 
        {
        }

        ///  
        /// InputGestureCollection
        ///  
        /// InputGesture array 
        public InputGestureCollection( IList inputGestures )
        { 
            if (inputGestures != null && inputGestures.Count > 0)
            {
                this.AddRange(inputGestures as ICollection);
            } 

        } 
#endregion Constructors 

        //------------------------------------------------------ 
        //
        //  Public Methods
        //
        //----------------------------------------------------- 

#region Public Methods 
 
#region Implementation of IList
 
#region Implementation of ICollection
        /// 
        /// CopyTo - to copy the entire collection into an array
        ///  
        /// 
        ///  
        void ICollection.CopyTo(System.Array array, int index) 
        {
            if (_innerGestureList != null) 
                ((ICollection)_innerGestureList).CopyTo(array, index);
        }

#endregion Implementation of ICollection 
        /// 
        /// IList.Contains 
        ///  
        /// key
        /// true - if found, false - otherwise 
        bool IList.Contains(object key)
        {
            return this.Contains(key as InputGesture) ;
        } 

        ///  
        /// IndexOf 
        /// 
        ///  
        /// 
        int IList.IndexOf(object value)
        {
            InputGesture inputGesture = value as InputGesture; 
            return ((inputGesture != null) ? this.IndexOf(inputGesture) : -1) ;
        } 
 
        /// 
        ///  Insert 
        /// 
        /// index at which to insert the item
        /// item value to insert
        void IList.Insert(int index, object value) 
        {
            if (IsReadOnly) 
                 throw new NotSupportedException(SR.Get(SRID.ReadOnlyInputGesturesCollection)); 

            this.Insert(index, value as InputGesture); 
        }

        /// 
        /// Add 
        /// 
        ///  
        int IList.Add(object inputGesture) 
        {
            if (IsReadOnly) 
                throw new NotSupportedException(SR.Get(SRID.ReadOnlyInputGesturesCollection));

            return this.Add(inputGesture as InputGesture);
        } 

        ///  
        /// Remove 
        /// 
        ///  
        void IList.Remove(object inputGesture)
        {
            if (IsReadOnly)
                throw new NotSupportedException(SR.Get(SRID.ReadOnlyInputGesturesCollection)); 

            this.Remove(inputGesture as InputGesture); 
        } 

        ///  
        /// Indexing operator
        /// 
        object IList.this[int index]
        { 
            get
            { 
                return this[index]; 
            }
            set 
            {
                InputGesture inputGesture = value as InputGesture;
                if (inputGesture == null)
                    throw new NotSupportedException(SR.Get(SRID.CollectionOnlyAcceptsInputGestures)); 

                this[index] = inputGesture; 
            } 
        }
#endregion Implementation of IList 

#region Implementation of Enumerable
         /// 
         /// IEnumerable.GetEnumerator - For Enumeration purposes 
         /// 
         ///  
         public IEnumerator GetEnumerator() 
         {
             if (_innerGestureList != null) 
                 return _innerGestureList.GetEnumerator();

             List list = new List(0);
             return list.GetEnumerator(); 
         }
#endregion Implementation of IEnumberable 
         ///  
         /// Indexing operator
         ///  
         public InputGesture this[int index]
         {
             get
             { 
                 return (_innerGestureList != null ? _innerGestureList[index] : null);
             } 
             set 
             {
                 if (IsReadOnly) 
                     throw new NotSupportedException(SR.Get(SRID.ReadOnlyInputGesturesCollection));

                 EnsureList();
 
                 if (_innerGestureList != null)
                 { 
                     _innerGestureList[index] = value; 
                 }
             } 
         }

         /// 
         /// ICollection.IsSynchronized 
         /// 
         public bool IsSynchronized 
         { 
             get
             { 
                 if (_innerGestureList != null)
                     return ((IList)_innerGestureList).IsSynchronized;

                 return false; 
             }
         } 
 
         /// 
         /// ICollection.SyncRoot 
         /// 
         public object SyncRoot
         {
             get 
             {
                 return _innerGestureList != null ? ((IList)_innerGestureList).SyncRoot : this; 
             } 
         }
 
         /// 
         /// IndexOf
         /// 
         ///  
         /// 
         public int IndexOf(InputGesture value) 
         { 
             return (_innerGestureList != null) ? _innerGestureList.IndexOf(value) : -1;
         } 

         /// 
         /// RemoveAt - Removes the item at given index
         ///  
         /// index at which item needs to be removed
         public void RemoveAt(int index) 
         { 
             if (IsReadOnly)
                 throw new NotSupportedException(SR.Get(SRID.ReadOnlyInputGesturesCollection)); 

             if (_innerGestureList != null)
                _innerGestureList.RemoveAt(index);
         } 

         ///  
         /// IsFixedSize - Fixed Capacity if ReadOnly, else false. 
         /// 
         public bool IsFixedSize 
         {
             get
             {
                 return IsReadOnly; 
             }
        } 
 
        /// 
        /// Add 
        /// 
        /// 
        public int Add(InputGesture inputGesture)
        { 
            if (IsReadOnly)
            { 
                throw new NotSupportedException(SR.Get(SRID.ReadOnlyInputGesturesCollection)); 
            }
 
 	    if (inputGesture == null)
            {
		throw new ArgumentNullException("inputGesture");
            } 

            EnsureList(); 
            _innerGestureList.Add(inputGesture); 
            return 0; // ICollection.Add no longer returns the indice
        } 

        /// 
        /// Adds the elements of the given collection to the end of this list. If
        /// required, the capacity of the list is increased to twice the previous 
        /// capacity or the new size, whichever is larger.
        ///  
        /// collection to append 
        public void AddRange(ICollection collection)
        { 
            if (IsReadOnly)
            {
                throw new NotSupportedException(SR.Get(SRID.ReadOnlyInputGesturesCollection));
            } 

            if (collection == null) 
                throw new ArgumentNullException("collection"); 

            if( collection.Count > 0) 
            {
                if (_innerGestureList == null)
                    _innerGestureList = new System.Collections.Generic.List(collection.Count);
 
                IEnumerator collectionEnum = collection.GetEnumerator();
                while(collectionEnum.MoveNext()) 
                { 
                    InputGesture inputGesture = collectionEnum.Current as InputGesture;
                    if (inputGesture != null) 
                    {
                        _innerGestureList.Add(inputGesture);
                    }
                    else 
                    {
                        throw new NotSupportedException(SR.Get(SRID.CollectionOnlyAcceptsInputGestures)); 
		    } 
                }
            } 
        }

        /// 
        ///  Insert 
        /// 
        /// index at which to insert the item 
        /// item value to insert 
        public void Insert(int index, InputGesture inputGesture)
        { 
            if (IsReadOnly)
                 throw new NotSupportedException(SR.Get(SRID.ReadOnlyInputGesturesCollection));

            if (inputGesture == null) 
                throw new NotSupportedException(SR.Get(SRID.CollectionOnlyAcceptsInputGestures));
 
            if (_innerGestureList != null) 
                _innerGestureList.Insert(index, inputGesture);
        } 

        /// 
        /// IsReadOnly - Tells whether this is readonly Collection.
        ///  
        public bool IsReadOnly
        { 
            get 
            {
                return (_isReadOnly); 
            }
        }

        ///  
        /// Remove
        ///  
        ///  
        public void Remove(InputGesture inputGesture)
        { 
            if (IsReadOnly)
            {
                 throw new NotSupportedException(SR.Get(SRID.ReadOnlyInputGesturesCollection));
            } 

            if (inputGesture == null) 
	        { 
                throw new ArgumentNullException("inputGesture");
 	        } 

            if (_innerGestureList != null && _innerGestureList.Contains(inputGesture))
            {
                _innerGestureList.Remove(inputGesture as InputGesture); 
            }
        } 
 
        /// 
        /// Count 
        /// 
        public int Count
        {
            get 
            {
                return (_innerGestureList != null ? _innerGestureList.Count : 0 ); 
            } 
        }
 
        /// 
        /// Clears the Entire InputGestureCollection
        /// 
        public void Clear() 
        {
            if (IsReadOnly) 
            { 
                 throw new NotSupportedException(SR.Get(SRID.ReadOnlyInputGesturesCollection));
            } 

	    if (_innerGestureList != null)
            {
               _innerGestureList.Clear(); 
               _innerGestureList = null;
            } 
        } 

        ///  
        /// Contains
        /// 
        /// key
        /// true - if found, false - otherwise 
        public bool Contains(InputGesture key)
        { 
            if (_innerGestureList != null && key != null) 
            {
               return _innerGestureList.Contains(key) ; 
            }
            return false;
        }
 
        /// 
        /// CopyTo - to copy the collection starting from given index into an array 
        ///  
        /// Array of InputGesture
        /// start index of items to copy 
        public void CopyTo(InputGesture[] inputGestures, int index)
        {
            if (_innerGestureList != null)
                _innerGestureList.CopyTo(inputGestures, index); 
        }
 
        ///  
        /// Seal the Collection by setting it as  read-only.
        ///  
        public void Seal()
        {
            _isReadOnly = true;
        } 

        private void EnsureList() 
        { 
            if (_innerGestureList == null)
                _innerGestureList = new List(1); 
        }
#endregion Public

        //------------------------------------------------------ 
        //
        //  Protected Methods 
        // 
        //------------------------------------------------------
 
        //-----------------------------------------------------
        //
        //  Private Methods
        // 
        //------------------------------------------------------
        #region Internal 
 
        internal InputGesture FindMatch(object targetElement, InputEventArgs inputEventArgs)
        { 
            for (int i = 0; i < Count; i++)
            {
                InputGesture inputGesture = this[i];
                if (inputGesture.Matches(targetElement, inputEventArgs)) 
                {
                    return inputGesture; 
                } 
            }
 
            return null;
        }

        #endregion 

        //----------------------------------------------------- 
        // 
        //  Private Fields
        // 
        //-----------------------------------------------------
#region Private Fields
        private System.Collections.Generic.List _innerGestureList;
        private bool           _isReadOnly = false; 
#endregion Private Fields
    } 
} 

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