UndoHandler (MPS.Core (JetBrains MPS 2019.1.0))

All Known Implementing Classes:

DefaultUndoHandler
```
public interface UndoHandler
```
A mechanism to have globally-accessible platform-specific UndoHandler implementation. Platform supplies proper UndoHandler instance with a help of UndoHelper singleton.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`addUndoableAction(SNodeUndoableAction action)`	Receives information about a model change in a form suitable for undo.

- Method Detail
  - addUndoableAction
```
void addUndoableAction(SNodeUndoableAction action)
```
    Receives information about a model change in a form suitable for undo. It's up to implementation to react, i.e. to use some platform mechanism to record the action, filter based on internal state or even to ignore it altogether.
    
    Parameters:
    
    action - never null