Undo Namespace

Namespace Avalonia.Controls.Documents.Undo

Types

• EmptyUndoUnit - Sentinel Avalonia.Controls.Documents.Undo.IUndoUnit returned by empty / no-op undo scopes (when undo is disabled, or while a replay is in progress and Avalonia.Controls.Documents.Undo.UndoManager.BeginUndoUnit(string,Nullable{Avalonia.Controls.Documents.Undo.SelectionSnapshot}) short-circuits to an empty scope). Never appears on Avalonia.Controls.Documents.TextModel.DocumentChangedEventArgs.UndoUnit — that property is when no real unit was opened, so null and Avalonia.Controls.Documents.Undo.EmptyUndoUnit.Instance retain distinct semantics.
• IUndoHistory - Reads the undo and redo stacks.
• IUndoManager - Records and replays document edits.
• IUndoScope - Scope returned by Avalonia.Controls.Documents.Undo.UndoManager.BeginUndoUnit(string,Nullable{Avalonia.Controls.Documents.Undo.SelectionSnapshot}). Disposing the scope commits the unit to the undo stack (or nests it inside a parent scope). Callers may attach a post-edit selection snapshot via Avalonia.Controls.Documents.Undo.IUndoScope.SetSelectionAfter(Nullable{Avalonia.Controls.Documents.Undo.SelectionSnapshot}) before disposing.
• IUndoUnit - Read-only metadata for an undo/redo operation. The reversal mechanics live on an internal contract, so a unit obtained from Avalonia.Controls.Documents.Undo.UndoManager.Undo or Avalonia.Controls.Documents.Undo.IUndoScope.Unit can be described but not replayed by a caller.
• NullUndoManager - An Avalonia.Controls.Documents.Undo.IUndoManager that records nothing.
• SelectionSnapshot - Value-type snapshot of a Avalonia.Controls.TextSelection captured at a point in time. Stores a frozen Avalonia.Controls.Documents.TextModel.TextPointer per endpoint together with the offset inside that endpoint's cached leaf and the child-index path from the document root down to that leaf.
• UndoManager - Manages undo/redo operations for a document. Set one on Avalonia.Controls.Documents.TextModel.TextDocument.UndoManager to record changes; leave that property , or set Avalonia.Controls.Documents.Undo.UndoManager.IsEnabled to , for a document that records nothing.