OnUndoRedoChanged Method

protected virtual void OnUndoRedoChanged( 
   EventArgs e
)

'Declaration
 
Protected Overridable Sub OnUndoRedoChanged( _
   ByVal e As EventArgs _
) 

'Usage
 
Dim instance As AnnAutomation
Dim e As EventArgs
 
instance.OnUndoRedoChanged(e)

protected virtual void OnUndoRedoChanged( 
   ~Remove~ e
)

 function Leadtools.Windows.Annotations.AnnAutomation.OnUndoRedoChanged( 
   e 
)

protected:
virtual void OnUndoRedoChanged( 
   EventArgs^ e
) 

Parameters

e

An System.EventArgs that contains the event data.

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.

For C#/VB examples, refer to UndoRedoChanged.

Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

Reference

AnnAutomation Class
AnnAutomation Members