Class UndoableEditSupport

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