Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / MS / Internal / Ink / XamlClipboardData.cs / 1305600 / 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 waynezen: 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; //security helper from PresentationCore 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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