TextFormatter.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Core / CSharp / System / Windows / Media / textformatting / TextFormatter.cs / 1305600 / TextFormatter.cs
                        
                        
                            //------------------------------------------------------------------------ 
//
//  Microsoft Windows Client Platform
//  Copyright (C) Microsoft Corporation, 2001
// 
//  File:      TextFormatter.cs
// 
//  Contents:  Text formatting API 
//
//  Spec:      http://team/sites/Avalon/Specs/Text%20Formatting%20API.doc 
//
//  Created:   2-25-2003 Worachai Chaoweeraprasit (wchao)
//
//----------------------------------------------------------------------- 

 
using System; 
using System.Windows.Threading;
using System.Collections.Generic; 

using MS.Internal;
using MS.Internal.TextFormatting;
using MS.Internal.PresentationCore; 

 
namespace System.Windows.Media.TextFormatting 
{
    ///  
    /// The TextFormatter is the Windows Client Platform text engine that provides services
    /// for formatting text and breaking text lines. It handles different text character
    /// formats with different paragraph styles. It also implements all the writing system rules
    /// for international text layout. 
    ///
    /// Unlike traditional text APIs, the TextFormatter interacts with a text layout client 
    /// through a set of callback methods. It requires the client to provide these methods 
    /// in an implementation of the TextSource class.
    ///  
    public abstract class TextFormatter : IDisposable
    {
        private static object _staticLock = new object();
 
        /// 
        /// Client to create a new instance of TextFormatter 
        ///  
        /// New instance of TextFormatter
        static public TextFormatter Create(TextFormattingMode textFormattingMode) 
        {
            if ((int)textFormattingMode < 0 || (int)textFormattingMode > 1)
            {
                throw new System.ComponentModel.InvalidEnumArgumentException("textFormattingMode", (int)textFormattingMode, typeof(TextFormattingMode)); 
            }
 
            // create a new instance of TextFormatter which allows the use of multiple contexts. 
            return new TextFormatterImp(textFormattingMode);
        } 

        /// 
        /// Client to create a new instance of TextFormatter
        ///  
        /// New instance of TextFormatter
        static public TextFormatter Create() 
        { 
            // create a new instance of TextFormatter which allows the use of multiple contexts.
            return new TextFormatterImp(); 
        }


        ///  
        /// Client to create a new instance of TextFormatter from the specified TextFormatter context
        ///  
        /// TextFormatter context 
        /// New instance of TextFormatter
#if OPTIMALBREAK_API 
        static public TextFormatter CreateFromContext(TextFormatterContext soleContext)
#else
        [FriendAccessAllowed]   // used by Framework
        static internal TextFormatter CreateFromContext(TextFormatterContext soleContext) 
#endif
        { 
            // create a new instance of TextFormatter for the specified context. 
            // This creation prohibits the use of multiple contexts within the same TextFormatter via reentrance.
            return new TextFormatterImp(soleContext, TextFormattingMode.Ideal); 
        }

        /// 
        /// Client to create a new instance of TextFormatter from the specified TextFormatter context 
        /// 
        /// TextFormatter context 
        /// New instance of TextFormatter 
#if OPTIMALBREAK_API
        static public TextFormatter CreateFromContext(TextFormatterContext soleContext, TextFormattingMode textFormattingMode) 
#else
        [FriendAccessAllowed]   // used by Framework
        static internal TextFormatter CreateFromContext(TextFormatterContext soleContext, TextFormattingMode textFormattingMode)
#endif 
        {
            // create a new instance of TextFormatter for the specified context. 
            // This creation prohibits the use of multiple contexts within the same TextFormatter via reentrance. 
            return new TextFormatterImp(soleContext, textFormattingMode);
        } 


        /// 
        /// Client to get TextFormatter associated with the current dispatcher 
        /// 
        ///  
        /// This method is available internally. It is exclusively used by Presentation Framework UIElement 
        /// through friend assembly mechanics to quickly reuse the default TextFormatter retained in the current
        /// dispatcher of the running thread. 
        /// 
        [FriendAccessAllowed]   // used by Framework
        static internal TextFormatter FromCurrentDispatcher()
        { 
            return FromCurrentDispatcher(TextFormattingMode.Ideal);
        } 
 
        /// 
        /// Client to get TextFormatter associated with the current dispatcher 
        /// 
        /// 
        /// This method is available internally. It is exclusively used by Presentation Framework UIElement
        /// through friend assembly mechanics to quickly reuse the default TextFormatter retained in the current 
        /// dispatcher of the running thread.
        ///  
        [FriendAccessAllowed]   // used by Framework 
        static internal TextFormatter FromCurrentDispatcher(TextFormattingMode textFormattingMode)
        { 
            Dispatcher dispatcher = Dispatcher.CurrentDispatcher;

            if (dispatcher == null)
                throw new ArgumentException(SR.Get(SRID.CurrentDispatcherNotFound)); 

            TextFormatter defaultTextFormatter; 
            if (textFormattingMode == TextFormattingMode.Display) 
            {
                defaultTextFormatter = (TextFormatterImp)dispatcher.Reserved4; 
            }
            else
            {
                defaultTextFormatter = (TextFormatterImp)dispatcher.Reserved1; 
            }
 
            if (defaultTextFormatter == null) 
            {
                lock (_staticLock) 
                {
                    if (defaultTextFormatter == null)
                    {
                        // Default formatter has not been created for this dispatcher, 
                        // create a new one and stick it to the dispatcher.
                        defaultTextFormatter = Create(textFormattingMode); 
 
                        if (textFormattingMode == TextFormattingMode.Display)
                        { 
                            dispatcher.Reserved4 = defaultTextFormatter;
                        }
                        else
                        { 
                            dispatcher.Reserved1 = defaultTextFormatter;
                        } 
                    } 
                }
            } 

            Invariant.Assert(defaultTextFormatter != null);
            return defaultTextFormatter;
        } 

        ///  
        /// Clean up text formatter internal resource 
        /// 
        public virtual void Dispose() {} 



        ///  
        /// Client to format a text line that fills a paragraph in the document.
        ///  
        /// an object representing text layout clients text source for TextFormatter. 
        /// character index to specify where in the source text the line starts
        /// width of paragraph in which the line fills 
        /// properties that can change from one paragraph to the next, such as text flow direction, text alignment, or indentation.
        /// text formatting state at the point where the previous line in the paragraph
        /// was broken by the text formatting process, as specified by the TextLine.LineBreak property for the previous
        /// line; this parameter can be null, and will always be null for the first line in a paragraph. 
        /// object representing a line of text that client interacts with. 
        public abstract TextLine FormatLine( 
            TextSource                  textSource, 
            int                         firstCharIndex,
            double                      paragraphWidth, 
            TextParagraphProperties     paragraphProperties,
            TextLineBreak               previousLineBreak
            );
 

 
        ///  
        /// Client to format a text line that fills a paragraph in the document.
        ///  
        /// an object representing text layout clients text source for TextFormatter.
        /// character index to specify where in the source text the line starts
        /// width of paragraph in which the line fills
        /// properties that can change from one paragraph to the next, such as text flow direction, text alignment, or indentation. 
        /// text formatting state at the point where the previous line in the paragraph
        /// was broken by the text formatting process, as specified by the TextLine.LineBreak property for the previous 
        /// line; this parameter can be null, and will always be null for the first line in a paragraph. 
        /// an object representing content cache of the client.
        /// object representing a line of text that client interacts with.  
        public abstract TextLine FormatLine(
            TextSource                  textSource,
            int                         firstCharIndex,
            double                      paragraphWidth, 
            TextParagraphProperties     paragraphProperties,
            TextLineBreak               previousLineBreak, 
            TextRunCache                textRunCache 
            );
 


        /// 
        /// Client to reconstruct a previously formatted text line 
        /// 
        /// an object representing text layout clients text source for TextFormatter. 
        /// character index to specify where in the source text the line starts 
        /// character length of the line
        /// width of paragraph in which the line fills 
        /// properties that can change from one paragraph to the next, such as text flow direction, text alignment, or indentation.
        /// LineBreak property of the previous text line, or null if this is the first line in the paragraph
        /// an object representing content cache of the client.
        /// object representing a line of text that client interacts with.  
#if OPTIMALBREAK_API
        public abstract TextLine RecreateLine( 
#else 
        [FriendAccessAllowed]   // used by Framework
        internal abstract TextLine RecreateLine( 
#endif
            TextSource                  textSource,
            int                         firstCharIndex,
            int                         lineLength, 
            double                      paragraphWidth,
            TextParagraphProperties     paragraphProperties, 
            TextLineBreak               previousLineBreak, 
            TextRunCache                textRunCache
            ); 



        ///  
        /// Client to cache information about a paragraph to be used during optimal paragraph line formatting
        ///  
        /// an object representing text layout clients text source for TextFormatter. 
        /// character index to specify where in the source text the line starts
        /// width of paragraph in which the line fills 
        /// properties that can change from one paragraph to the next, such as text flow direction, text alignment, or indentation.
        /// text formatting state at the point where the previous line in the paragraph
        /// was broken by the text formatting process, as specified by the TextLine.LineBreak property for the previous
        /// line; this parameter can be null, and will always be null for the first line in a paragraph. 
        /// an object representing content cache of the client.
        /// object representing a line of text that client interacts with.  
#if OPTIMALBREAK_API 
        public abstract TextParagraphCache CreateParagraphCache(
#else 
        [FriendAccessAllowed]   // used by Framework
        internal abstract TextParagraphCache CreateParagraphCache(
#endif
            TextSource                  textSource, 
            int                         firstCharIndex,
            double                      paragraphWidth, 
            TextParagraphProperties     paragraphProperties, 
            TextLineBreak               previousLineBreak,
            TextRunCache                textRunCache 
            );


 
        /// 
        /// Client to ask for the possible smallest and largest paragraph width that can fully contain the passing text content 
        ///  
        /// an object representing text layout clients text source for TextFormatter.
        /// character index to specify where in the source text the line starts 
        /// properties that can change from one paragraph to the next, such as text flow direction, text alignment, or indentation.
        /// min max paragraph width
        public abstract MinMaxParagraphWidth FormatMinMaxParagraphWidth(
            TextSource                  textSource, 
            int                         firstCharIndex,
            TextParagraphProperties     paragraphProperties 
            ); 

 

        /// 
        /// Client to ask for the possible smallest and largest paragraph width that can fully contain the passing text content
        ///  
        /// an object representing text layout clients text source for TextFormatter.
        /// character index to specify where in the source text the line starts 
        /// properties that can change from one paragraph to the next, such as text flow direction, text alignment, or indentation. 
        /// an object representing content cache of the client.
        /// min max paragraph width 
        public abstract MinMaxParagraphWidth FormatMinMaxParagraphWidth(
            TextSource                  textSource,
            int                         firstCharIndex,
            TextParagraphProperties     paragraphProperties, 
            TextRunCache                textRunCache
            ); 
    } 
}

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