- java.lang.Object
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- javax.swing.undo.UndoableEditSupport
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public class UndoableEditSupport extends Object
A support class used for managingUndoableEditlisteners.
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Field Summary
Fields Modifier and Type Field Description protected CompoundEditcompoundEditThe compound edit.protected Vector<UndoableEditListener>listenersThe list of listeners.protected ObjectrealSourceThe real source.protected intupdateLevelThe update level.
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Constructor Summary
Constructors Constructor Description UndoableEditSupport()Constructs anUndoableEditSupportobject.UndoableEditSupport(Object r)Constructs anUndoableEditSupportobject.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description protected void_postEdit(UndoableEdit e)Called only frompostEditandendUpdate.voidaddUndoableEditListener(UndoableEditListener l)Registers anUndoableEditListener.voidbeginUpdate()protected CompoundEditcreateCompoundEdit()Called only frombeginUpdate.voidendUpdate()DEADLOCK WARNING: Calling this method may callundoableEditHappenedin all listeners.UndoableEditListener[]getUndoableEditListeners()Returns an array of all theUndoableEditListeners added to this UndoableEditSupport with addUndoableEditListener().intgetUpdateLevel()Returns the update level value.voidpostEdit(UndoableEdit e)DEADLOCK WARNING: Calling this method may callundoableEditHappenedin all listeners.voidremoveUndoableEditListener(UndoableEditListener l)Removes anUndoableEditListener.StringtoString()Returns a string that displays and identifies this object's properties.
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Field Detail
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updateLevel
protected int updateLevel
The update level.
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compoundEdit
protected CompoundEdit compoundEdit
The compound edit.
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listeners
protected Vector<UndoableEditListener> listeners
The list of listeners.
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realSource
protected Object realSource
The real source.
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Constructor Detail
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UndoableEditSupport
public UndoableEditSupport()
Constructs anUndoableEditSupportobject.
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UndoableEditSupport
public UndoableEditSupport(Object r)
Constructs anUndoableEditSupportobject.- Parameters:
r- anObject
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Method Detail
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addUndoableEditListener
public void addUndoableEditListener(UndoableEditListener l)
Registers anUndoableEditListener. The listener is notified whenever an edit occurs which can be undone.- Parameters:
l- anUndoableEditListenerobject- See Also:
removeUndoableEditListener(javax.swing.event.UndoableEditListener)
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removeUndoableEditListener
public void removeUndoableEditListener(UndoableEditListener l)
Removes anUndoableEditListener.- Parameters:
l- theUndoableEditListenerobject to be removed- See Also:
addUndoableEditListener(javax.swing.event.UndoableEditListener)
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getUndoableEditListeners
public UndoableEditListener[] getUndoableEditListeners()
Returns an array of all theUndoableEditListeners 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 frompostEditandendUpdate. CallsundoableEditHappenedin all listeners. No synchronization is performed here, since the two calling methods are synchronized.- Parameters:
e- edit to be verified
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postEdit
public void postEdit(UndoableEdit e)
DEADLOCK WARNING: Calling this method may callundoableEditHappenedin all listeners. It is unwise to call this method from one of its listeners.- Parameters:
e- edit to be posted
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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 frombeginUpdate. Exposed here for subclasses' use.- Returns:
- new created
CompoundEditobject
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endUpdate
public void endUpdate()
DEADLOCK WARNING: Calling this method may callundoableEditHappenedin all listeners. It is unwise to call this method from one of its listeners.
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