CommandBindingCollection.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 / CommandBindingCollection.cs / 2 / CommandBindingCollection.cs
                        
                        
                            //---------------------------------------------------------------------------- 
//
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
//
// 
// Description: The CommandBindingCollection class serves the purpose of Storing/Retrieving 
//                   CommandBindings.
// 
//              See spec at : [....]/coreUI/Specs/Commanding%20--%20design.htm
//
//
// History: 
//          03/25/2004 : [....] - Created
// 
//--------------------------------------------------------------------------- 

using System; 
using System.Collections;
using System.Diagnostics;
using System.Collections.Specialized;
using System.Windows; 
using System.Windows.Input;
 
using SR=MS.Internal.PresentationCore.SR; 
using SRID=MS.Internal.PresentationCore.SRID;
 
namespace System.Windows.Input
{
    /// 
    /// CommandBindingCollection - Collection of CommandBindings. 
    ///     Stores the CommandBindings Sequentially in an System.Collections.Generic.List"CommandBinding".
    ///     Will be changed to generic List implementation once the 
    ///     parser supports generic collections. 
    /// 
    public sealed class CommandBindingCollection : IList 
    {
        //-----------------------------------------------------
        //
        //  Constructors 
        //
        //----------------------------------------------------- 
#region Constructors 
        /// 
        /// Constructor 
        /// 
        public CommandBindingCollection()
        {
        } 

        ///  
        /// CommandBindingCollection 
        /// 
        /// CommandBinding array 
        public CommandBindingCollection(IList commandBindings)
        {
            if (commandBindings != null && commandBindings.Count > 0)
            { 
                AddRange(commandBindings 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
        ///  
        /// commandbinding array to copy into 
        /// start index in current list to copy
        void ICollection.CopyTo(System.Array array, int index) 
        {
            if (_innerCBList != null)
            {
                ((ICollection)_innerCBList).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 CommandBinding) ; 
        }
 
        /// 
        /// IndexOf
        /// 
        /// item whose index is queried 
        /// 
        int IList.IndexOf(object value) 
        { 
            CommandBinding commandBinding = value as CommandBinding;
            return ((commandBinding != null) ? this.IndexOf(commandBinding) : -1); 
        }

        /// 
        ///  Insert 
        /// 
        /// index at which to insert the given item 
        /// item to insert 
        void IList.Insert(int index, object value)
        { 
            this.Insert(index, value as CommandBinding);
        }

        ///  
        /// Add
        ///  
        /// CommandBinding object to add 
        int IList.Add(object commandBinding)
        { 
            return this.Add(commandBinding as CommandBinding);
        }

        ///  
        /// Remove
        ///  
        /// CommandBinding object to remove 
        void IList.Remove(object commandBinding)
        { 
            this.Remove(commandBinding as CommandBinding);
        }

        ///  
        /// Indexing operator
        ///  
        object IList.this[int index] 
        {
            get 
            {
                return this[index];
            }
            set 
            {
                CommandBinding commandBinding = value as CommandBinding; 
                if (commandBinding == null) 
                    throw new NotSupportedException(SR.Get(SRID.CollectionOnlyAcceptsCommandBindings));
 
                this[index] = commandBinding;
            }
        }
#endregion Implementation of IList 
        /// 
        /// Indexing operator 
        ///  
        public CommandBinding  this[int index]
        { 
            get
            {
                return (_innerCBList != null ? _innerCBList[index] : null);
            } 
            set
            { 
                if (_innerCBList != null) 
                {
                    _innerCBList[index] = value; 
                }
            }
        }
 
        /// 
        /// Add 
        ///  
        /// commandBinding to add
        public int Add(CommandBinding commandBinding) 
        {
            if (commandBinding != null)
            {
                if (_innerCBList == null) 
                    _innerCBList = new System.Collections.Generic.List(1);
 
                _innerCBList.Add(commandBinding); 
                return 0; // ICollection.Add no longer returns the indice
            } 
            else
            {
                throw new NotSupportedException(SR.Get(SRID.CollectionOnlyAcceptsCommandBindings));
            } 
        }
 
        ///  
        /// 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 (collection==null) 
                throw new ArgumentNullException("collection"); 

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

        /// 
        ///  Insert 
        /// 
        /// index at which to insert the given item 
        /// item to insert 
        public void Insert(int index, CommandBinding commandBinding)
        { 
            if (commandBinding != null)
            {
                if (_innerCBList != null)
                    _innerCBList.Insert(index, commandBinding); 
            }
            else 
            { 
                throw new NotSupportedException(SR.Get(SRID.CollectionOnlyAcceptsCommandBindings));
            } 
        }

        /// 
        /// Remove 
        /// 
        /// CommandBinding to remove 
        public void Remove(CommandBinding commandBinding) 
        {
            if (_innerCBList != null && commandBinding != null) 
                _innerCBList.Remove(commandBinding);
        }

        ///  
        /// RemoveAt
        ///  
        /// index at which the item needs to be removed 
        public void RemoveAt(int index)
        { 
            if (_innerCBList != null)
                _innerCBList.RemoveAt(index);
        }
 
        /// 
        /// IsFixedSize 
        ///  
        public bool IsFixedSize
        { 
            get { return IsReadOnly; }
        }

        ///  
        /// ICollection.IsSynchronized
        ///  
        public bool IsSynchronized 
        {
            get 
            {
                if (_innerCBList != null)
                {
                    return ((IList)_innerCBList).IsSynchronized; 
                }
                return false; 
            } 
        }
 
        /// 
        /// Synchronization Root to take lock on
        /// 
        public object SyncRoot 
        {
            get 
            { 
                return this;
            } 
        }

        /// 
        /// IList.IsReadOnly - Tells whether this is readonly Collection. 
        /// 
        public bool IsReadOnly 
        { 
            get { return false; }
        } 

        /// 
        /// Count
        ///  
        public int Count
        { 
            get 
            {
                return (_innerCBList != null ? _innerCBList.Count : 0); 
            }
        }

        ///  
        /// Clears the Entire CommandBindingCollection
        ///  
        public void Clear() 
        {
            if (_innerCBList != null) 
            {
                _innerCBList.Clear();
                _innerCBList = null;
            } 
        }
 
        ///  
        /// IndexOf
        ///  
        /// 
        /// 
        public int IndexOf(CommandBinding value)
        { 
            return ((_innerCBList != null) ? _innerCBList.IndexOf(value) : -1);
        } 
 
        /// 
        /// Contains 
        /// 
        /// commandBinding to check
        /// true - if found, false - otherwise
        public bool Contains(CommandBinding commandBinding) 
        {
             if (_innerCBList != null && commandBinding != null) 
             { 
                   return _innerCBList.Contains(commandBinding) ;
             } 
             return false;
        }

        ///  
        /// CopyTo - to copy the entire collection starting at an index into an array
        ///  
        ///  type-safe (CommandBinding) array 
        /// start index in current list to copy
        public void CopyTo(CommandBinding[] commandBindings, int index) 
        {
            if (_innerCBList != null)
                _innerCBList.CopyTo(commandBindings, index);
        } 

#region Implementation of Enumerable 
        ///  
        /// IEnumerable.GetEnumerator - For Enumeration purposes
        ///  
        /// 
        public IEnumerator GetEnumerator()
        {
            if (_innerCBList != null) 
                return _innerCBList.GetEnumerator();
 
            System.Collections.Generic.List list = new System.Collections.Generic.List(0); 
            return list.GetEnumerator();
        } 
#endregion Implementation of IEnumberable

#endregion Public
 
        #region Internal
 
        internal ICommand FindMatch(object targetElement, InputEventArgs inputEventArgs) 
        {
            for (int i = 0; i < Count; i++) 
            {
                CommandBinding commandBinding = this[i];
                RoutedCommand routedCommand = commandBinding.Command as RoutedCommand;
                if (routedCommand != null) 
                {
                    InputGestureCollection inputGestures = routedCommand.InputGestures; 
                    if (inputGestures != null) 
                    {
                        if (inputGestures.FindMatch(targetElement, inputEventArgs) != null) 
                        {
                            return routedCommand;
                        }
                    } 
                }
            } 
 
            return null;
        } 

        internal CommandBinding FindMatch(ICommand command, ref int index)
        {
            while (index < Count) 
            {
                CommandBinding commandBinding = this[index++]; 
                if (commandBinding.Command == command) 
                {
                    return commandBinding; 
                }
            }

            return null; 
        }
 
        #endregion 
        //------------------------------------------------------
        // 
        //  Private Fields
        //
        //------------------------------------------------------
#region Private Fields 
        private System.Collections.Generic.List  _innerCBList;
#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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