DrawingVisualDrawingContext.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 / Core / CSharp / System / Windows / Media / DrawingVisualDrawingContext.cs / 1305600 / DrawingVisualDrawingContext.cs
                        

                        
                            //------------------------------------------------------------------------------ 
//  Microsoft Avalon
//  Copyright (c) Microsoft Corporation, 2003
//
//  File:       VisualDrawingContext.cs 
//
//  History: 
//      [....]: 04/19/2003 
//          Created it based on the DrawingVisualDrawingContext used in the AvPhat branch.
//      [....]: 07/02/2003 
//          Renamed to RetainedDrawingContext, which derives from DrawingContext
//      [....]: 07/16/2003
//          Renamed again to DrawingVisualDrawingContext, which derives from RenderDataDrawingContext
// 
//-----------------------------------------------------------------------------
 
using System; 
using System.Security.Permissions;
using System.Windows; 
using System.Windows.Threading;

using System.Windows.Media.Animation;
using System.Windows.Media; 
using System.Windows.Media.Composition;
using System.Diagnostics; 
using MS.Internal; 

namespace System.Windows.Media 
{
    /// 
    /// VisualDrawingContext - the DrawingContext for Visuals that can create it.
    ///  
    internal class VisualDrawingContext : RenderDataDrawingContext
    { 
        #region Constructors 

        ///  
        /// Creates a drawing context for a DrawingVisual.
        /// The Visual must not be null.
        /// 
        ///  The Visual that created the DrawingContext, which must not be null.  
        internal VisualDrawingContext(
            Visual ownerVisual 
            ) 
        {
            Debug.Assert(null != ownerVisual); 

            _ownerVisual = ownerVisual;
        }
 
        #endregion Constructors
 
        #region Protected Methods 

        ///  
        /// CloseCore - Implemented be derivees to Close the context.
        /// This will only be called once (if ever) per instance.
        /// 
        ///  The render data produced by this RenderDataDrawingContext.   
        protected override void CloseCore(RenderData renderData)
        { 
            Debug.Assert(null != _ownerVisual); 

            _ownerVisual.RenderClose(renderData); 

#if DEBUG
            _ownerVisual = null;
#endif 
        }
 
        #endregion Protected Methods 

        #region Private Fields 

        private Visual _ownerVisual;

        #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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