ISFClipboardData.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / MS / Internal / Ink / ISFClipboardData.cs / 1305600 / ISFClipboardData.cs
                        

                        
                            //---------------------------------------------------------------------------- 
//
// File: ISFClipboardData.cs
//
// Description: 
//      A class which can convert the clipboard data from/to StrokeCollection
// 
// Features: 
//
// History: 
//  11/17/2004 waynezen:       Created
//
// Copyright (C) 2001 by Microsoft Corporation.  All rights reserved.
// 
//---------------------------------------------------------------------------
 
using System; 
using System.IO;
using System.Windows; 
using System.Windows.Controls;
using System.Windows.Ink;
using System.Security;
using System.Security.Permissions; 

namespace MS.Internal.Ink 
{ 
    internal class ISFClipboardData : ClipboardData
    { 
        //-------------------------------------------------------------------------------
        //
        // Constructors
        // 
        //-------------------------------------------------------------------------------
 
        #region Constructors 

        // The default constructor 
        internal ISFClipboardData() { }

        // The constructor which takes StrokeCollection argument
        internal ISFClipboardData(StrokeCollection strokes) 
        {
            _strokes = strokes; 
        } 

        // Checks if the data can be pasted. 
        internal override bool CanPaste(IDataObject dataObject)
        {
            return dataObject.GetDataPresent(StrokeCollection.InkSerializedFormat, false);
        } 

        #endregion Constructors 
 
        //--------------------------------------------------------------------------------
        // 
        // Protected Methods
        //
        //-------------------------------------------------------------------------------
 
        #region Protected Methods
 
        // Checks if there is stroke data in this instance 
        protected override bool CanCopy()
        { 
            return (Strokes != null && Strokes.Count != 0);
        }

        // Copies the internal strokes to the IDataObject 
        /// 
        ///    Critical: This code asserts to set data on a data object 
        ///  
        [SecurityCritical]
        protected override void DoCopy(IDataObject dataObject) 
        {
            // samgeo - Presharp issue
            // Presharp gives a warning when local IDisposable variables are not closed
            // in this case, we can't call Dispose since it will also close the underlying stream 
            // which needs to be open for consumers to read
#pragma warning disable 1634, 1691 
#pragma warning disable 6518 

            // Save the data in the data object. 
            MemoryStream stream = new MemoryStream();
            Strokes.Save(stream);
            stream.Position = 0;
            (new UIPermission(UIPermissionClipboard.AllClipboard)).Assert();//BlessedAssert 
            try
            { 
                dataObject.SetData(StrokeCollection.InkSerializedFormat, stream); 
            }
            finally 
            {
                UIPermission.RevertAssert();
            }
#pragma warning restore 6518 
#pragma warning restore 1634, 1691
        } 
 
        // Retrieves the stroks from the IDataObject
        protected override void DoPaste(IDataObject dataObject) 
        {
            // Check if we have ink data
            MemoryStream stream = dataObject.GetData(StrokeCollection.InkSerializedFormat) as MemoryStream;
 
            StrokeCollection newStrokes = null;
            bool fSucceeded = false; 
            if ( stream != null && stream != Stream.Null ) 
            {
                try 
                {
                    // Now add these ink strokes to the InkCanvas ink collection.
                    newStrokes = new StrokeCollection(stream);
                    fSucceeded = true; 
                }
                catch ( ArgumentException ) 
                { 
                    // If an invalid stream was passed in, we should get ArgumentException here.
                    // We catch this specific exception and eat it. 
                    fSucceeded = false;
                }
            }
 
            // Depending on whether we are succeeded or not, we set the correct stroke collection here.
            _strokes = fSucceeded ? newStrokes : new StrokeCollection(); 
        } 

        #endregion Protected Methods 

        //--------------------------------------------------------------------------------
        //
        // Internal Properties 
        //
        //-------------------------------------------------------------------------------- 
 
        #region Internal Properties
 
        // Gets the strokes
        internal StrokeCollection Strokes
        {
            get 
            {
                return _strokes; 
            } 
        }
 
        #endregion Internal Properties

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

        #region Private Fields 

        StrokeCollection    _strokes;

        #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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