OnUndoRedoChanged Method

Summary

Raises the UndoRedoChanged event.

Syntax

Java

Objective-C

WinRT C#

C++

protected virtual void OnUndoRedoChanged( 
   EventArgs e 
)

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

protected virtual void OnUndoRedoChanged(  
   EventArgs e 
)

-(void) onUndoRedoChanged;

protected void onUndoRedoChanged(LeadEvent event)

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

protected:  
   virtual void OnUndoRedoChanged( 
      EventArgs^ e 
   )

Parameters

e
Event data.

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