java.lang.Object
- javax.swing.undo.UndoableEditSupport

```
public class UndoableEditSupport
extends Object
```
A support class used for managing UndoableEdit listeners.

Field Summary

Fields
Modifier and Type	Field	Description
`protected CompoundEdit`	`compoundEdit`	The compound edit.
`protected Vector<UndoableEditListener>`	`listeners`	The list of listeners.
`protected Object`	`realSource`	The real source.
`protected int`	`updateLevel`	The update level.

Constructor Summary

Constructors
Constructor Description

UndoableEditSupport()
Constructs an UndoableEditSupport object.

UndoableEditSupport(Object r)
Constructs an UndoableEditSupport object.

Method Summary

Modifier and Type	Method	Description
`protected void`	`_postEdit(UndoableEdit e)`	Called only from `postEdit` and `endUpdate`.
`void`	`addUndoableEditListener(UndoableEditListener l)`	Registers an `UndoableEditListener`.
`void`	`beginUpdate()`
`protected CompoundEdit`	`createCompoundEdit()`	Called only from `beginUpdate`.
`void`	`endUpdate()`	DEADLOCK WARNING: Calling this method may call `undoableEditHappened` in all listeners.
`UndoableEditListener[]`	`getUndoableEditListeners()`	Returns an array of all the `UndoableEditListener`s added to this UndoableEditSupport with addUndoableEditListener().
`int`	`getUpdateLevel()`	Returns the update level value.
`void`	`postEdit(UndoableEdit e)`	DEADLOCK WARNING: Calling this method may call `undoableEditHappened` in all listeners.
`void`	`removeUndoableEditListener(UndoableEditListener l)`	Removes an `UndoableEditListener`.
`String`	`toString()`	Returns a string that displays and identifies this object's properties.

Methods declared in class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Field Detail
  - updateLevel
```
protected int updateLevel
```
    The update level.
  - compoundEdit
```
protected CompoundEdit compoundEdit
```
    The compound edit.
  - listeners
```
protected Vector<UndoableEditListener> listeners
```
    The list of listeners.
  - realSource
```
protected Object realSource
```
    The real source.
- Constructor Detail
  - UndoableEditSupport
```
public UndoableEditSupport()
```
    Constructs an UndoableEditSupport object.
  - UndoableEditSupport
```
public UndoableEditSupport(Object r)
```
    Constructs an UndoableEditSupport object.
    
    Parameters:
    
    r - an Object
- Method Detail
  - addUndoableEditListener
```
public void addUndoableEditListener(UndoableEditListener l)
```
    Registers an UndoableEditListener. The listener is notified whenever an edit occurs which can be undone.
    
    Parameters:
    
    l - an UndoableEditListener object
    
    See Also:
    
    removeUndoableEditListener(javax.swing.event.UndoableEditListener)
  - removeUndoableEditListener
```
public void removeUndoableEditListener(UndoableEditListener l)
```
    Removes an UndoableEditListener.
    
    Parameters:
    
    l - the UndoableEditListener object to be removed
    
    See Also:
    
    addUndoableEditListener(javax.swing.event.UndoableEditListener)
  - getUndoableEditListeners
```
public UndoableEditListener[] getUndoableEditListeners()
```
    Returns an array of all the UndoableEditListeners added to this UndoableEditSupport with addUndoableEditListener().
    
    Returns:
    
    all of the UndoableEditListeners added or an empty array if no listeners have been added
    
    Since:
    
    1.4
  - _postEdit
```
protected void _postEdit(UndoableEdit e)
```
    Called only from postEdit and endUpdate. Calls undoableEditHappened in all listeners. No synchronization is performed here, since the two calling methods are synchronized.
    
    Parameters:
    
    e - edit to be verified
  - postEdit
```
public void postEdit(UndoableEdit e)
```
    DEADLOCK WARNING: Calling this method may call undoableEditHappened in all listeners. It is unwise to call this method from one of its listeners.
    
    Parameters:
    
    e - edit to be posted
  - getUpdateLevel
```
public int getUpdateLevel()
```
    Returns the update level value.
    
    Returns:
    
    an integer representing the update level
  - beginUpdate
```
public void beginUpdate()
```
  - createCompoundEdit
```
protected CompoundEdit createCompoundEdit()
```
    Called only from beginUpdate. Exposed here for subclasses' use.
    
    Returns:
    
    new created CompoundEdit object
  - endUpdate
```
public void endUpdate()
```
    DEADLOCK WARNING: Calling this method may call undoableEditHappened in all listeners. It is unwise to call this method from one of its listeners.
  - toString
```
public String toString()
```
    Returns a string that displays and identifies this object's properties.
    
    Overrides:
    
    toString in class Object
    
    Returns:
    
    a String representation of this object

Constructor	Description
`UndoableEditSupport()`	Constructs an `UndoableEditSupport` object.
`UndoableEditSupport(Object r)`	Constructs an `UndoableEditSupport` object.

Class UndoableEditSupport

Field Summary

Constructor Summary

Method Summary

Methods declared in class java.lang.Object

Field Detail

updateLevel

compoundEdit

listeners

realSource

Constructor Detail

UndoableEditSupport

UndoableEditSupport

Method Detail

addUndoableEditListener

removeUndoableEditListener

getUndoableEditListeners

_postEdit

postEdit

getUpdateLevel

beginUpdate

createCompoundEdit

endUpdate

toString