TextModifierScope.cs source code in C# .NET

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Code:

                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Core / System / Windows / Media / textformatting / TextModifierScope.cs / 1 / TextModifierScope.cs
                        

                        
                            //------------------------------------------------------------------------ 
//
//  Microsoft Windows Client Platform
//  Copyright (C) Microsoft Corporation, 2001
// 
//  File:      TextModifierScope.cs
// 
//  Contents:  Text modification API 
//
//  Spec:      [....]/text/DesignDocsAndSpecs/Text%20Formatting%20API.doc 
//
//  Created:   12-5-2004 [....] ([....])
//
//----------------------------------------------------------------------- 

using System; 
using System.Collections; 
using System.Collections.Generic;
using System.Windows; 
using System.Windows.Media;

namespace System.Windows.Media.TextFormatting
{ 
    /// 
    /// Represents a single "frame" in the stack of text modifiers. The stack 
    /// is represented not as an array, but as a linked structure in which each 
    /// frame points to its parent.
    ///  
    internal sealed class TextModifierScope
    {
        private TextModifierScope _parentScope;
        private TextModifier _modifier; 
        private int _cp;
 
        ///  
        /// Constructs a new text modification state object.
        ///  
        /// Parent scope, i.e., the previous top of the stack.
        /// Text modifier run fetched from the client.
        /// Text source character index of the run.
        internal TextModifierScope(TextModifierScope parentScope, TextModifier modifier, int cp) 
        {
            _parentScope = parentScope; 
            _modifier = modifier; 
            _cp = cp;
        } 

        /// 
        /// Next item in the stack of text modifiers.
        ///  
        public TextModifierScope ParentScope
        { 
            get { return _parentScope; } 
        }
 
        /// 
        /// Text modifier run fetched from the client.
        /// 
        public TextModifier TextModifier 
        {
            get { return _modifier; } 
        } 

        ///  
        /// Character index of the text modifier run.
        /// 
        public int TextSourceCharacterIndex
        { 
            get { return _cp; }
        } 
 
        /// 
        /// Modifies the specified text run properties by invoking the modifier at 
        /// the current scope and all containing scopes.
        /// 
        /// Properties to modify.
        /// Returns the text run properties after modification. 
        internal TextRunProperties ModifyProperties(TextRunProperties properties)
        { 
            for (TextModifierScope scope = this; scope != null; scope = scope._parentScope) 
            {
                properties = scope._modifier.ModifyProperties(properties); 
            }
            return properties;
        }
 
        /// 
        /// Performs a deep copy of the stack of TextModifierScope objects. 
        ///  
        /// Returns the top of the new stack.
        internal TextModifierScope CloneStack() 
        {
            TextModifierScope top = new TextModifierScope(null, _modifier, _cp);
            TextModifierScope scope = top;
 
            for (TextModifierScope source = _parentScope; source != null; source = source._parentScope)
            { 
                scope._parentScope = new TextModifierScope(null, source._modifier, source._cp); 
                scope = scope._parentScope;
            } 

            return top;
        }
    } 
}

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

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