Module java.desktop
Package 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 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

      public void removeUndoableEditListener(UndoableEditListener l)
      Removes an UndoableEditListener.
      Parameters:
      l - the UndoableEditListener object to be removed
      See Also:

    • 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