InputBinding.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 / InputBinding.cs / 1 / InputBinding.cs
                        
                        
                            //---------------------------------------------------------------------------- 
//
// Copyright (C) Microsoft Corporation.  All rights reserved.
//
//--------------------------------------------------------------------------- 

using System; 
using System.Security;              // SecurityCritical, TreatAsSafe 
using System.Security.Permissions;
using System.Windows; 
using System.Windows.Markup;
using System.ComponentModel;

 
namespace System.Windows.Input
{ 
    ///  
    /// InputBinding - InputGesture and ICommand combination
    ///                Used to specify the binding between Gesture and Command at Element level. 
    /// 
    public class InputBinding : DependencyObject, ICommandSource
    {
#region Constructor 

        ///  
        ///     Default Constructor - needed to allow markup creation 
        /// 
        protected InputBinding() 
        {
        }

        ///  
        /// Constructor
        ///  
        /// Command 
        /// Input Gesture
        ///  
        /// Critical - may associate a secure command with a gesture, in
        ///            these cases we need to demand the appropriate permission.
        /// TreatAsSafe - Calls CheckSecureCommand which does the appropriate demand.
        ///  
        [SecurityCritical]
        public InputBinding(ICommand command, InputGesture gesture) 
        { 
            if (command == null)
                throw new ArgumentNullException("command"); 

            if (gesture == null)
                throw new ArgumentNullException("gesture");
 
            // Check before assignment to avoid continuation
            CheckSecureCommand(command, gesture); 
 
            _command = command;
            _gesture = gesture; 
        }

#endregion Constructor
        //----------------------------------------------------- 
        //
        //  Public Methods 
        // 
        //-----------------------------------------------------
#region Public Methods 
        /// 
        /// Command Object associated
        /// 
        ///  
        /// Critical - may associate a secure command with a gesture, in
        ///            these cases we need to demand the appropriate permission. 
        /// PublicOk - Calls CheckSecureCommand which does the appropriate demand. 
        /// 
        [TypeConverter("System.Windows.Input.CommandConverter, PresentationFramework, Version=" + Microsoft.Internal.BuildInfo.WCP_VERSION + ", Culture=neutral, PublicKeyToken=" + Microsoft.Internal.BuildInfo.WCP_PUBLIC_KEY_TOKEN + ", Custom=null")] 
        [Localizability(LocalizationCategory.NeverLocalize)] // cannot be localized
        public ICommand Command
        {
            get 
            {
                return _command; 
            } 
            [SecurityCritical]
            set 
            {
                if (value == null)
                    throw new ArgumentNullException("value");
 
                lock (_dataLock)
                { 
                    // Check before assignment to avoid continuation 
                    //
                    CheckSecureCommand(value, _gesture); 

                    _command = value;
                }
            } 
        }
 
        ///  
        ///     A parameter for the command.
        ///  
        public object CommandParameter
        {
            get
            { 
                return _commandParameter;
            } 
            set 
            {
                lock (_dataLock) 
                {
                    _commandParameter = value;
                }
            } 
        }
 
        ///  
        ///     Where the command should be raised.
        ///  
        public IInputElement CommandTarget
        {
            get
            { 
                return _commandTarget;
            } 
            set 
            {
                lock (_dataLock) 
                {
                    _commandTarget = value;
                }
            } 
        }
 
        ///  
        /// InputGesture associated with the Command
        ///  
        /// 
        /// Critical - may associate a secure command with a gesture, in
        ///            these cases we need to demand the appropriate permission.
        /// PublicOk - Calls CheckSecureCommand which does the appropriate demand. 
        /// 
        public virtual InputGesture Gesture 
        { 
            // We would like to make this getter non-virtual but that's not legal
            // in C#.  Luckily there is no security issue with leaving it virtual. 
            get
            {
                return _gesture;
            } 

            [SecurityCritical] 
            set 
            {
                if (value == null) 
                    throw new ArgumentNullException("value");

                lock (_dataLock)
                { 
                    // Check before assignment to avoid continuation
                    // 
                    CheckSecureCommand(_command, value); 

                    _gesture = value; 
                }
            }
        }
#endregion Public Methods 
        //------------------------------------------------------
        // 
        //  Internal Methods 
        //
        //----------------------------------------------------- 

        /// 
        /// Critical - determines if a command will later make an
        ///            assert. This is critical to be right, because 
        ///            later we assume that the binding was protected.
        /// TreatAsSafe - Demand() is not an unsafe operation 
        ///  
        [SecurityCritical, SecurityTreatAsSafe]
        void CheckSecureCommand(ICommand command, InputGesture gesture) 
        {
            ISecureCommand secure = command as ISecureCommand;
            if (secure != null)
            { 
                secure.UserInitiatedPermission.Demand();
            } 
        } 

        //------------------------------------------------------ 
        //
        //  Private Fields
        //
        //------------------------------------------------------ 

#region Private Fields 
        private     ICommand     _command = null ; 
        private     InputGesture  _gesture = null ;
        private object _commandParameter; 
        private IInputElement _commandTarget;

        internal static object _dataLock = new object();
#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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