Leadtools.Annotations Requires Document/Medical product license | Send comments on this topic. | Back to Introduction - All Topics | Help Version 15.10.31
OnUndoRedoChanged Method
See Also 
Leadtools.Annotations Namespace > AnnAutomation Class : OnUndoRedoChanged Method




e
An EventArgs that contains the event data.
Raises the UndoRedoChanged event.

Syntax

Visual Basic (Declaration) 
Protected Overridable Sub OnUndoRedoChanged( _
   ByVal e As EventArgs _
) 
Visual Basic (Usage)Copy Code
Dim instance As AnnAutomation
Dim e As EventArgs
 
instance.OnUndoRedoChanged(e)
C# 
protected virtual void OnUndoRedoChanged( 
   EventArgs e
)
Managed Extensions for C++ 
protected: virtual void OnUndoRedoChanged( 
   EventArgs* e
) 
C++/CLI 
protected:
virtual void OnUndoRedoChanged( 
   EventArgs^ e
) 

Parameters

e
An EventArgs that contains the event data.

Example

For an example, refer to UndoRedoChanged.

Remarks

Raising an event invokes the event handler through a delegate. The OnUndoRedoChanged method also allows derived classes to handle the event without attaching a delegate. This is the preferred technique for handling the event in a derived class. Notes to Inheritors: When overriding OnUndoRedoChanged in a derived class, be sure to call the base class's OnUndoRedoChanged method so that registered delegates receive the event.

The UndoRedoChanged event will be fired when the undo/redo buffer changes. This gives the application a chance to update the user interface if needed.

The undo/redo buffer changes whenever an object inside the Container changes either by user interaction through the user interface or by code.

You can use the CanUndo property and the CanRedo property to determine whether this AnnAutomation can undo or redo an operation.

Requirements

Target Platforms: Microsoft .NET Framework 2.0, Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family

See Also

Leadtools.Annotations requires a Document or Medical toolkit license and unlock key. For more information, refer to: Raster Pro/Document/Medical Features