Provides an abstract class for specifying character data and formatting properties to be used by the TextFormatter object.
Assembly: PresentationCore (in PresentationCore.dll)
Thetype exposes the following members.
|Equals(Object)||Determines whether the specified object is equal to the current object. (Inherited from Object.)|
|Finalize||Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)|
|GetHashCode||Serves as the default hash function. (Inherited from Object.)|
|GetPrecedingText||Retrieves the text span immediately before the specified position.|
|GetTextEffectCharacterIndexFromTextSourceCharacterIndex||Retrieves a value that maps a character index to a TextEffect character index.|
|GetTextRun||Retrieves a TextRun starting at a specified position.|
|GetType||Gets the Type of the current instance. (Inherited from Object.)|
|MemberwiseClone||Creates a shallow copy of the current Object. (Inherited from Object.)|
|ToString||Returns a string that represents the current object. (Inherited from Object.)|
All access to the text in the 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 class. The following list describes the three members you must override:
GetPrecedingText: Retrieves the text span immediately before the specified position.
GetTextEffectCharacterIndexFromTextSourceCharacterIndex: Retrieves a value that maps a character index to a TextEffect character index.
For a complete code sample that shows how to implement a derived class, see Advanced Text Formatting Sample .