org.openide.awt
Class UndoRedo.Empty

java.lang.Object
  |
  +--org.openide.awt.UndoRedo.Empty

All Implemented Interfaces:

UndoRedo

Enclosing class:

UndoRedo

public static final class UndoRedo.Empty

extends Object

implements UndoRedo

Empty implementation that does not support any undoable edits. Use UndoRedo.NONE rather than instantiating this.

Inner classes inherited from class org.openide.awt.UndoRedo

UndoRedo.Empty, UndoRedo.Manager

Fields inherited from interface org.openide.awt.UndoRedo

NONE

Constructor Summary

UndoRedo.Empty()

Method Summary

void	addChangeListener(ChangeListener l) Add a change listener.
boolean	canRedo() Test whether the component currently has undone edits which may be redone.
boolean	canUndo() Test whether the component currently has edits which may be undone.
String	getRedoPresentationName() Get a human-presentable name describing the redo operation.
String	getUndoPresentationName() Get a human-presentable name describing the undo operation.
void	redo() Redo a previously undone edit.
void	removeChangeListener(ChangeListener l) Remove a change listener.
void	undo() Undo an edit.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

UndoRedo.Empty

public UndoRedo.Empty()

Method Detail

canUndo

public boolean canUndo()

Description copied from interface: UndoRedo

Test whether the component currently has edits which may be undone.

Specified by:

canUndo in interface UndoRedo

Following copied from interface: org.openide.awt.UndoRedo

Returns:

true if undo is allowed

canRedo

public boolean canRedo()

Description copied from interface: UndoRedo

Test whether the component currently has undone edits which may be redone.

Specified by:

canRedo in interface UndoRedo

Following copied from interface: org.openide.awt.UndoRedo

Returns:

true if redo is allowed

undo

public void undo()
          throws CannotUndoException

Description copied from interface: UndoRedo

Undo an edit.

Specified by:

undo in interface UndoRedo

Following copied from interface: org.openide.awt.UndoRedo

Throws:

CannotUndoException - if it fails

redo

public void redo()
          throws CannotRedoException

Description copied from interface: UndoRedo

Redo a previously undone edit.

Specified by:

redo in interface UndoRedo

Following copied from interface: org.openide.awt.UndoRedo

Throws:

CannotRedoException - if it fails

addChangeListener

public void addChangeListener(ChangeListener l)

Description copied from interface: UndoRedo

Add a change listener. The listener will be notified every time the undo/redo ability of this object changes.

Specified by:

addChangeListener in interface UndoRedo

Following copied from interface: org.openide.awt.UndoRedo

Parameters:

l - the listener to add

removeChangeListener

public void removeChangeListener(ChangeListener l)

Description copied from interface: UndoRedo

Remove a change listener.

Specified by:

removeChangeListener in interface UndoRedo

Following copied from interface: org.openide.awt.UndoRedo

Parameters:

l - the listener to remove

See Also:

UndoRedo.addChangeListener(javax.swing.event.ChangeListener)

getUndoPresentationName

public String getUndoPresentationName()

Description copied from interface: UndoRedo

Get a human-presentable name describing the undo operation.

Specified by:

getUndoPresentationName in interface UndoRedo

Following copied from interface: org.openide.awt.UndoRedo

Returns:

the name

getRedoPresentationName

public String getRedoPresentationName()

Description copied from interface: UndoRedo

Get a human-presentable name describing the redo operation.

Specified by:

getRedoPresentationName in interface UndoRedo

Following copied from interface: org.openide.awt.UndoRedo

Returns:

the name