Provides an abstract class for specifying character data and formatting properties to be used by the TextFormatter object.
(in PresentationCore.dll)
Visual Basic (Declaration)
Public MustInherit Class TextSource
Dim instance As TextSource
public abstract class TextSource
public ref class TextSource abstract
public abstract class TextSource
This class is abstract; see Inheritance Hierarchy for derived non-abstract classes usable in XAML.
All access to the text in the TextSource object is through the GetTextRun, which is designed to allow the text layout client to virtualize text in any way it chooses.
TextFormatter is the WPF text engine that provides services for formatting text and breaking text lines. TextFormatter can handle different text character formats and paragraph styles, and includes support for international text layout. Unlike a traditional text API, 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. The following list describes the three members you must override:
System..::.Object
System.Windows.Media.TextFormatting..::.TextSource
Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
.NET Framework
Supported in: 3.5, 3.0
Reference
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