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UndoableEditSupport (Java 2 Platform SE 5.0) - JDK 5 Documentation v1.5.0, Java 2 SDK 英文文档

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javax.swing.undo
Class UndoableEditSupport

java.lang.Object
  javax.swing.undo.UndoableEditSupport

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public class UndoableEditSupport
extends Object

A support class used for managing UndoableEdit listeners.

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Field Summary
protected  CompoundEdit	compoundEdit
protected  Vector<UndoableEditListener>	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 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 inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

 

Field Detail

updateLevel

protected int updateLevel

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compoundEdit

protected CompoundEdit compoundEdit

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listeners

protected Vector<UndoableEditListener> listeners

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realSource

protected Object realSource

Constructor Detail

UndoableEditSupport

public UndoableEditSupport()

Constructs an UndoableEditSupport object.

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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)

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removeUndoableEditListener

public void removeUndoableEditListener(UndoableEditListener l)

Removes an UndoableEditListener.

Parameters:

l - the UndoableEditListener object to be removed

See Also:

addUndoableEditListener(javax.swing.event.UndoableEditListener)

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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

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_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.

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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.

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getUpdateLevel

public int getUpdateLevel()

Returns the update level value.

Returns:

an integer representing the update level

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beginUpdate

public void beginUpdate()

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createCompoundEdit

protected CompoundEdit createCompoundEdit()

Called only from beginUpdate. Exposed here for subclasses' use.

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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.

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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 2004 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.