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## javax.swing.undo
Class UndoableEditSupport

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

    public class UndoableEditSupport

extends Object

A support class used for managing `UndoableEdit` listeners.

Field Summary
`protected CompoundEdit` | `compoundEdit`
`protected Vector<UndoableEditListener>` | `listeners`
`protected Object` | `realSource`
`protected int` | `updateLevel`

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

Method Summary
`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 inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Field Detail

### updateLevel

    protected int updateLevel

### compoundEdit

    protected CompoundEdit compoundEdit

### listeners

    protected Vector<UndoableEditListener> listeners

### realSource

    protected Object realSource

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 `UndoableEditListener`s added to this UndoableEditSupport with addUndoableEditListener().

  Returns:
    all of the `UndoableEditListener`s 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.

### 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.

### 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.

### 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

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