UndoContext (SNAP Engine API)

All Known Implementing Classes:

DefaultUndoContext
```
public interface UndoContext
```
A context providing basic undo/redo functionality.

Since:

Ceres 0.10

See Also:

UndoManager, UndoableEditSupport

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`addUndoableEditListener(UndoableEditListener listener)`	Adds an undoable edit listener.
`boolean`	`canRedo()`
`boolean`	`canUndo()`
`UndoableEditListener[]`	`getUndoableEditListeners()`	Gets the array of all undoable edit listeners.
`void`	`postEdit(UndoableEdit edit)`	Posts an undoable edit.
`void`	`redo()`
`void`	`removeUndoableEditListener(UndoableEditListener listener)`	Removes an undoable edit listener.
`void`	`undo()`

- Method Detail
  - canUndo
```
boolean canUndo()
```
  - undo
```
void undo()
```
  - canRedo
```
boolean canRedo()
```
  - redo
```
void redo()
```
  - postEdit
```
void postEdit(UndoableEdit edit)
```
    Posts an undoable edit. Listeners will be notified.
    
    Parameters:
    
    edit - The undoable edit.
  - addUndoableEditListener
```
void addUndoableEditListener(UndoableEditListener listener)
```
    Adds an undoable edit listener.
    
    Parameters:
    
    listener - The listener.
  - removeUndoableEditListener
```
void removeUndoableEditListener(UndoableEditListener listener)
```
    Removes an undoable edit listener.
    
    Parameters:
    
    listener - The listener.
  - getUndoableEditListeners
```
UndoableEditListener[] getUndoableEditListeners()
```
    Gets the array of all undoable edit listeners.
    
    Returns:
    
    The array of listeners or an empty array if no listeners have been added