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

All Methods Instance Methods Concrete Methods
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