Undo Method

C#
Visual Basic
Objective-C
Java
C++

public virtual void Undo()

'Declaration
 
Public Overridable Sub Undo()

'Usage
 
Dim instance As AnnAutomation
 
instance.Undo()

public:
virtual void Undo();

This method will undo the last operation performed in this AnnAutomation if the CanUndo property returns true.

Use the UndoCapacity property to get or set the number of user actions that can be reversed using the Undo method, or re-applied using the Redo method. The default for the UndoCapacity property is 10 actions.

For more information, refer to Undoing Automation Operations.

This example selects the first annotation object in the automation container, deletes it, performs an undo, and then redos the operation.

C#
Visual Basic
WinRT C#
WinRT JavaScript
Silverlight C#
Silverlight VB

Copy Code

Imports Leadtools
Imports Leadtools.Annotations
Imports Leadtools.WinForms
Imports Leadtools.Drawing

Public Sub AnnAutomation_Undo(ByVal automation As AnnAutomation)
   If automation.Container.Objects.Count > 0 Then
      ' select the first object in the automation
      automation.StartEditing(automation.Container.Objects(0), False)
      MessageBox.Show("Object has been selected.  Next delete it")
      ' delete this object
      automation.Delete()
      MessageBox.Show("Object has been deleted.  Next undo the operation to bring the object back")

      ' undo the delete operation
      automation.Undo()
      MessageBox.Show("Operation has been undone and the object is back.  Next redo the operation to delete the object again")

      ' redo the delete operation
      automation.Redo()
      MessageBox.Show("Operation has been redone and the object is deleted again.")
   Else
      MessageBox.Show("No objects in the container!")
   End If
End Sub

using Leadtools;
using Leadtools.Annotations;
using Leadtools.WinForms;
using Leadtools.Drawing;

public void AnnAutomation_Undo(AnnAutomation automation)
{
   if(automation.Container.Objects.Count > 0)
   {
      // select the first object in the automation
      automation.StartEditing(automation.Container.Objects[0], false);
      MessageBox.Show("Object has been selected.  Next delete it");
      // delete this object
      automation.Delete();
      MessageBox.Show("Object has been deleted.  Next undo the operation to bring the object back");

      // undo the delete operation
      automation.Undo();
      MessageBox.Show("Operation has been undone and the object is back.  Next redo the operation to delete the object again");

      // redo the delete operation
      automation.Redo();
      MessageBox.Show("Operation has been redone and the object is deleted again.");
   }
   else
      MessageBox.Show("No objects in the container!");
}

Target Platforms

Reference

AnnAutomation Class
AnnAutomation Members