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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.
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 - an UndoableEditListener object

See Also:

addUndoableEditListener(javax.swing.event.UndoableEditListener)

_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 synchonized.

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 int 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