DirtyTextRange.cs source code in C# .NET

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Code:

                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / MS / Internal / PtsHost / DirtyTextRange.cs / 2 / DirtyTextRange.cs
                        

                        
                            //---------------------------------------------------------------------------- 
//
// Copyright (C) Microsoft Corporation.  All rights reserved.
//
// File: DirtyTextRange.cs 
//
// Description: Dirty text range describes change in the TextContainer. 
// 
// History:
//  06/06/2003 : [....] - created. 
//
//---------------------------------------------------------------------------

using System; 
using System.Windows.Controls;
using System.Windows.Documents; 
 
namespace MS.Internal.PtsHost
{ 
    // ---------------------------------------------------------------------
    // Dirty text range describes change in the TextContainer.
    // ---------------------------------------------------------------------
    internal struct DirtyTextRange 
    {
        // ------------------------------------------------------------------ 
        // Constructor 
        //
        //      startIndex - Index of the starting position of the change. 
        //      positionsAdded - Number of characters added.
        //      positionsRemoved - Number of characters removed.
        // -----------------------------------------------------------------
        internal DirtyTextRange(int startIndex, int positionsAdded, int positionsRemoved) : 
            this(startIndex, positionsAdded, positionsRemoved, false /* affectsRenderOnly */)
        { 
        } 

        // ------------------------------------------------------------------ 
        // Constructor
        //
        //      startIndex - Index of the starting position of the change.
        //      positionsAdded - Number of characters added. 
        //      positionsRemoved - Number of characters removed.
        //      affectsRenderOnly - true if change does not affect measure (highlight change) 
        // ------------------------------------------------------------------ 
        internal DirtyTextRange(int startIndex, int positionsAdded, int positionsRemoved, bool affectsRenderOnly)
        { 
            StartIndex = startIndex;
            PositionsAdded = positionsAdded;
            PositionsRemoved = positionsRemoved;
            AffectsRenderOnly = affectsRenderOnly; 
        }
 
        // ----------------------------------------------------------------- 
        // Constructor
        // 
        //      change - TextContainer change data.
        // ------------------------------------------------------------------
        internal DirtyTextRange(TextContainerChangeEventArgs change)
        { 
            StartIndex = change.ITextPosition.Offset;
 
            PositionsAdded = 0; 
            PositionsRemoved = 0;
 
            switch (change.TextChange)
            {
                case TextChangeType.ContentAdded:
                    PositionsAdded = change.Count; 
                    break;
 
                case TextChangeType.ContentRemoved: 
                    PositionsRemoved = change.Count;
                    break; 

                case TextChangeType.PropertyModified:
                    PositionsAdded = change.Count;
                    PositionsRemoved = change.Count; 
                    break;
            } 
 
            AffectsRenderOnly = false;
        } 

        // -----------------------------------------------------------------
        // Index of the starting position of the change.
        // ----------------------------------------------------------------- 
        internal int StartIndex;
 
        // ----------------------------------------------------------------- 
        // Number of characters added.
        // ------------------------------------------------------------------ 
        internal int PositionsAdded;

        // -----------------------------------------------------------------
        // Number of characters removed. 
        // ------------------------------------------------------------------
        internal int PositionsRemoved; 
 
        // ------------------------------------------------------------------
        // true if the change affects render only (ie, a highlight change). 
        // -----------------------------------------------------------------
        internal bool AffectsRenderOnly;
    }
} 

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

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