UndoManager.UndoPosition

All Known Implementing Classes:

UndoManagerImpl.UndoPositionImpl

Enclosing interface:

UndoManager<C>
```
public static interface UndoManager.UndoPosition
```
Represents a position in UndoManager's history.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`boolean`	`isValid()`	Checks whether this history position is still valid.
`void`	`mark()`	Sets the mark of the underlying UndoManager at this position.

- Method Detail
  - mark
```
void mark()
```
    Sets the mark of the underlying UndoManager at this position. The mark is set whether or not this position is valid. It is OK for an UndoManager to be marked at an invalid position.
  - isValid
```
boolean isValid()
```
    Checks whether this history position is still valid. A position becomes invalid when
    
    the change immediately preceding the position is undone and then discarded due to another incoming change; or
    
    the change immediately following the position is forgotten due to history size limit.