XamlClipboardData.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 / Framework / MS / Internal / Ink / XamlClipboardData.cs / 1 / XamlClipboardData.cs
                        

                        
                            //---------------------------------------------------------------------------- 
//
// File: XamlClipboardData.cs
//
// Description: 
//      A base class which can copy an array of UIElement to the IDataObject as Xaml format.
//      It also can retrieve the Xaml data from the IDataObject and create a UIElement array. 
// 
// Features:
// 
// History:
//  11/17/2004 [....]:       Created
//
// Copyright (C) 2001 by Microsoft Corporation.  All rights reserved. 
//
//--------------------------------------------------------------------------- 
 
using System;
using System.Collections; 
using System.Collections.Generic;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Markup; 
using System.Security;
using System.Text; 
using System.Diagnostics; 
using MS.Internal.PresentationFramework; //security helper
 
namespace MS.Internal.Ink
{
    internal class XamlClipboardData : ElementsClipboardData
    { 
        //-------------------------------------------------------------------------------
        // 
        // Constructors 
        //
        //------------------------------------------------------------------------------- 

        #region Constructors

        // The default constructor 
        internal XamlClipboardData() { }
 
        // The constructor with UIElement[] as an argument 
        internal XamlClipboardData(UIElement[] elements) : base (elements)
        { 
        }

        // Checks if the data can be pasted.
        internal override bool CanPaste(IDataObject dataObject) 
        {
            // Check if we have Xaml data 
            bool hasXamlData = false; 
            try
            { 
                hasXamlData = dataObject.GetDataPresent(DataFormats.Xaml, false);
            }
            catch ( SecurityException )
            { 
                // If we are under the partial trust, the Xaml format will fail when it needs to be registered.
                // In this case, we should just disable the Paste Xaml format content. 
                hasXamlData = false; 
            }
 
            return hasXamlData;
        }

        #endregion Constructors 

        //-------------------------------------------------------------------------------- 
        // 
        // Protected Methods
        // 
        //-------------------------------------------------------------------------------

        #region Protected Methods
 
        // Check if we have data to be copied
        protected override bool CanCopy() 
        { 
            return Elements != null && Elements.Count != 0;
        } 

        // Convert the elements to the Xaml and copy the Xaml to the IDataObject

        ///  
        ///
        ///  
        ///  
        ///
        ///  Critical: Calls critical method 
        ///     SecurityHelper.ExtractAppDomainPermissionSetMinusSiteOfOrigin
        ///
        ///     We call this to ensure that the appdomain permission set is on the clipboard.
        ///     The Clipboard methods use this information to ensure that apps can not paste data 
        ///     that was copied in low trust to application to a high trust application
        /// 
        [SecurityCritical] 
        protected override void DoCopy(IDataObject dataObject)
        { 
            // Serialize the selected elements and add it to the data object.
            StringBuilder xmlData = new StringBuilder();

            foreach ( UIElement element in Elements ) 
            {
                string xml; 
 
                xml = XamlWriter.Save(element);
 
                xmlData.Append(xml);
            }

            // Set the data object as XML format. 
            dataObject.SetData(DataFormats.Xaml, xmlData.ToString());
 
            // 
            //  we need to copy the permission set on the clipboard for
            //  the Clipboard class methods.  See security note for details. 
            //
            PermissionSet permSet = SecurityHelper.ExtractAppDomainPermissionSetMinusSiteOfOrigin();
            string setString = permSet.ToString();
            Debug.Assert(setString.Length > 0); 
            dataObject.SetData(DataFormats.ApplicationTrust, setString);
 
        } 

        // Retrieves the Xaml from the IDataObject and instantiate the elements based on the Xaml 
        protected override void DoPaste(IDataObject dataObject)
        {
            ElementList = new List();
 
            // Get the XML data from the data object.
            string xml = dataObject.GetData(DataFormats.Xaml) as string; 
 
            if ( !String.IsNullOrEmpty(xml) )
            { 
                UIElement element = XamlReader.Load(new System.Xml.XmlTextReader(new System.IO.StringReader(xml))) as UIElement;
                if (element != null)
                {
                    ElementList.Add(element); 
                }
            } 
        } 

        #endregion Protected Methods 
    }
}

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

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