The UndoRedoChanged Event is available in LEADTOOLS Document and Medical Imaging toolkits.
Occurs when the undo or redo buffer changes.
Syntax
| Visual Basic (Declaration) | |
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Public Event UndoRedoChanged As EventHandler |
| Visual Basic (Usage) |  Copy Code |
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Dim instance As AnnAutomation
Dim handler As EventHandler
AddHandler instance.UndoRedoChanged, handler |
Example
This example updates an Undo and Redo menu handler's status.
| Visual Basic | Copy Code |
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Public Sub AnnAutomation_UndoRedoChanged(ByVal manager As AnnAutomationManager)
' subscribe to the UndoRedoChanged event of all automations
For Each automation As AnnAutomation In manager.Automations
AddHandler automation.UndoRedoChanged, AddressOf automation_UndoRedoChanged
Next automation
End Sub
Private Sub automation_UndoRedoChanged(ByVal sender As Object, ByVal e As EventArgs)
Dim automation As AnnAutomation = CType(IIf(TypeOf sender Is AnnAutomation, sender, Nothing), AnnAutomation)
' assume _menuItemUndo is the Undo menu, and _menuItemRedo is the Redo menu
_menuItemUndo.Enabled = automation.CanUndo
_menuItemRedo.Enabled = automation.CanRedo
End Sub |
| C# | Copy Code |
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public void AnnAutomation_UndoRedoChanged(AnnAutomationManager manager)
{
// subscribe to the UndoRedoChanged event of all automations
foreach(AnnAutomation automation in manager.Automations)
automation.UndoRedoChanged += new EventHandler(automation_UndoRedoChanged);
}
private void automation_UndoRedoChanged(object sender, EventArgs e)
{
AnnAutomation automation = sender as AnnAutomation;
// assume _menuItemUndo is the Undo menu, and _menuItemRedo is the Redo menu
_menuItemUndo.Enabled = automation.CanUndo;
_menuItemRedo.Enabled = automation.CanRedo;
} |
Remarks
Requirements
Target Platforms: Microsoft .NET Framework 2.0, Windows 2000, Windows XP, Windows Server 2003 family, Windows Server 2008 family, Windows Vista, Windows 7
See Also
