//---------------------------------------------------------------------------
//
// Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// Description: Contains base class for DrawingContext iterators
//
// History:  
//
//  2004/04/02 : Microsoft - Created it.
//  2005/06/20 : timothyc - Moved to codegen
//
//---------------------------------------------------------------------------
 
using System;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Security.Permissions;
using System.Windows.Threading;
using System.Windows;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Media.Imaging;
using System.Windows.Media.Media3D;
 
using MS.Internal;
 
namespace System.Windows.Media
{
    /// <summary>
    /// DrawingContextWalker : The base class for DrawingContext iterators.
    /// This is *not* thread safe
    /// </summary>
    internal abstract partial class DrawingContextWalker : DrawingContext
    {
        /// <summary>
        /// Constructor for DrawingContextWalker
        /// </summary>
        protected DrawingContextWalker()
        {
            // Nothing to do here
        }       
 
        /// <summary>
        /// DrawingContextWalker implementations are never opened, so they shouldn't be closed.
        /// </summary>
        public override sealed void Close()
        {
            Debug.Assert(false);
        }
 
        #region Protected methods
 
        /// <summary>
        /// DrawingContextWalker implementations are never opened, so they shouldn't be disposed.
        /// </summary>
        protected override void DisposeCore()
        {
            Debug.Assert(false);
        }
 
        /// <summary>
        /// StopWalking - If this called, the current walk will stop.
        /// </summary>
        protected void StopWalking()
        {
            _stopWalking = true;
        }
 
        #endregion Protected methods
 
        #region Internal properties
 
        /// <summary>
        /// ShouldStopWalking Property - internal clients can consult this property to determine
        /// whether or not the implementer of this DrawingContextWalker has called StopWalking.
        /// This can also be set by internal callers.
        /// </summary>
        internal bool ShouldStopWalking
        {
            get
            {
                return _stopWalking;
            }
            set
            {
                _stopWalking = value;
            }
        }              
 
        #endregion Internal properties        
 
        #region Private Members
 
        private bool _stopWalking;
        #endregion Private Members
    }
}