StagingAreaInputItem.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Core / System / Windows / Input / StagingAreaInputItem.cs / 1 / StagingAreaInputItem.cs
                        

                        
                            using System; 
using System.Collections;
using System.Security.Permissions;
using System.Security;
 
namespace System.Windows.Input
{ 
    ///  
    ///     This class encapsulates an input event while it is being
    ///     processed by the input manager. 
    /// 
    /// 
    ///     This class just provides the dictionary-based storage for
    ///     all of the listeners of the various input manager events. 
    /// 
    public class StagingAreaInputItem 
    { 
        // Only we can make these.
        internal StagingAreaInputItem(bool isMarker) 
        {
            _isMarker = isMarker;
        }
 
        // For performace reasons, we try to reuse these event args.
        // Allow an existing item to be promoted by keeping the existing dictionary. 
        internal void Reset(InputEventArgs input, StagingAreaInputItem promote) 
        {
            _input = input; 

            if(promote != null && promote._dictionary != null)
            {
                // 
                _dictionary = (Hashtable) promote._dictionary.Clone();
            } 
            else 
            {
                if(_dictionary != null) 
                {
                    _dictionary.Clear();
                }
                else 
                {
                    _dictionary = new Hashtable(); 
                } 
            }
        } 

        /// 
        ///     Returns the input event.
        ///  
        /// 
        ///     Callers must have UIPermission(PermissionState.Unrestricted) to call this API. 
        ///  
        /// 
        ///     Defense In Depth - even if this leaks out, we demand here. 
        /// 
        public InputEventArgs Input
        {
            [UIPermissionAttribute(SecurityAction.LinkDemand,Unrestricted=true)] 
            get {return _input;}
        } 
 
        /// 
        ///     Provides storage for arbitrary data needed during the 
        ///     processing of this input event.
        /// 
        /// 
        ///     An arbitrary key for the data.  This cannot be null. 
        /// 
        ///  
        ///     The data previously set for this key, or null. 
        /// 
        public object GetData(object key) 
        {
            return _dictionary[key];
        }
 
        /// 
        ///     Provides storage for arbitrary data needed during the 
        ///     processing of this input event. 
        /// 
        ///  
        ///     An arbitrary key for the data.  This cannot be null.
        /// 
        /// 
        ///     The data to set for this key.  This can be null. 
        /// 
        ///  
        ///     Callers must have UIPermission(PermissionState.Unrestricted) to call this API. 
        /// 
        ///  
        ///     Defense In Depth - even if this leaks out, we demand here.
        /// 
        [UIPermissionAttribute(SecurityAction.LinkDemand,Unrestricted=true)]
        public void SetData(object key, object value) 
        {
            _dictionary[key] = value; 
        } 

        internal bool IsMarker {get {return _isMarker;}} 

        private bool _isMarker;
        private InputEventArgs _input;
        private Hashtable _dictionary; 
    }
} 
 

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

Link Menu

Network programming in C#, Network Programming in VB.NET, Network Programming in .NET
This book is available now!
Buy at Amazon US or
Buy at Amazon UK