| Class | Description | |
|---|---|---|
 | ImageViewerUndoMonitor | The undo monitor that monitors changes in the ImageViewer object. |
| VisualToolUndoAction | Undo action that stores information about image changed with visual tool. |
| VisualToolUndoMonitor | The undo monitor that monitors the VisualTool object and adds an undo action to an undo manager if VisualTool changed an image. |