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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` | `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 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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For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

Copyright 2003 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.