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OnUndoRedoChanged Method
See Also 
Leadtools.Windows.Annotations Namespace > AnnAutomation Class : OnUndoRedoChanged Method



e
An System.EventArgs that contains the event data.

The OnUndoRedoChanged Method supports WPF/Silverlight.

The OnUndoRedoChanged Method is available in LEADTOOLS Document and Medical Imaging toolkits.

e
An System.EventArgs that contains the event data.
Raises the UndoRedoChanged event. Supported in Silverlight, Windows Phone 7

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
)
C++/CLI 
protected:
virtual void OnUndoRedoChanged( 
   EventArgs^ e
) 

Parameters

e
An System.EventArgs that contains the event data.

Example

For C#/VB examples, 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: Silverlight 3.0, Windows XP, Windows Server 2003 family, Windows Server 2008 family, Windows Vista, Windows 7, MAC OS/X (Intel Only)

See Also

OnUndoRedoChanged requires a Document/Medical product license and unlock key. For more information, refer to: Imaging Pro/Document/Medical Features and Unlocking Special LEAD Features.