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

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()	Starts a compound edit update.
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 UndoableEditListeners 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 Details

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 Details

UndoableEditSupport

public UndoableEditSupport()

Constructs an UndoableEditSupport object.

UndoableEditSupport

public UndoableEditSupport(Object r)

Constructs an UndoableEditSupport object.

Parameters:

r - an Object

Method Details

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()

Starts a compound edit update.

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