The Undo Method supports WPF/Silverlight.
The Undo Method is available in LEADTOOLS Document and Medical Imaging toolkits.
Undoes the last operation performed in this AnnAutomation. Supported in Silverlight, Windows Phone 7
Syntax
| Visual Basic (Declaration) | |
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Public Overridable Sub Undo() | |
| Visual Basic (Usage) |  Copy Code |
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Dim instance As AnnAutomation instance.Undo() | |
| C# | |
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public virtual void Undo() | |
| C++/CLI | |
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public: virtual void Undo(); | |
Example
This example selects the first annotation object in the automation container, deletes it, performs an undo, and then redos the operation.
| Visual Basic | Copy Code |
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Private Sub AnnAutomation_Undo(ByVal automation As AnnAutomation) If automation.Container.Children.Count > 0 Then ' select the first object in the automation automation.StartEditing(CType(automation.Container.Children(0), AnnObject), 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 | |
| C# | Copy Code |
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private void AnnAutomation_Undo(AnnAutomation automation) { if(automation.Container.Children.Count > 0) { // select the first object in the automation automation.StartEditing(automation.Container.Children[0] as AnnObject, 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!"); } | |
| SilverlightCSharp | Copy Code |
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private void AnnAutomation_Undo(AnnAutomation automation) { if(automation.Container.Children.Count > 0) { // select the first object in the automation automation.StartEditing(automation.Container.Children[0] as AnnObject, 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!"); } | |
| SilverlightVB | Copy Code |
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Private Sub AnnAutomation_Undo(ByVal automation As AnnAutomation)
If automation.Container.Children.Count > 0 Then
' select the first object in the automation
automation.StartEditing(TryCast(automation.Container.Children(0), AnnObject), 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 | |
Remarks
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 WPF Automation Operations.
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)