Java javax.swing.undo Class AbstractUndoableEdit（JDK8）

Field Detail

• UndoName

  protected static final String UndoName

  String returned by getUndoPresentationName; as of Java 2 platform v1.3.1 this field is no longer used. This value is now localized and comes from the defaults table with key AbstractUndoableEdit.undoText.

  See Also:

  UIDefaults, Constant Field Values

• RedoName

  protected static final String RedoName

  String returned by getRedoPresentationName; as of Java 2 platform v1.3.1 this field is no longer used. This value is now localized and comes from the defaults table with key AbstractUndoableEdit.redoText.

  See Also:

  UIDefaults, Constant Field Values

Constructor Detail

• AbstractUndoableEdit

  public AbstractUndoableEdit()

  Creates an AbstractUndoableEdit which defaults hasBeenDone and alive to true.

Method Detail

• die

  public void die()

  Sets alive to false. Note that this is a one way operation; dead edits cannot be resurrected. Sending undo or redo to a dead edit results in an exception being thrown.

  Typically an edit is killed when it is consolidated by another edit's addEdit or replaceEdit method, or when it is dequeued from an UndoManager.

  Specified by:

  die in interface UndoableEdit

  See Also:

  CompoundEdit.die()

• undo

  public void undo()
            throws CannotUndoException

  Throws CannotUndoException if canUndo returns false. Sets hasBeenDone to false. Subclasses should override to undo the operation represented by this edit. Override should begin with a call to super.

  Specified by:

  undo in interface UndoableEdit

  Throws:

  CannotUndoException - if canUndo returns false

  See Also:

  canUndo()

• canUndo

  public boolean canUndo()

  Returns true if this edit is alive and hasBeenDone is true.

  Specified by:

  canUndo in interface UndoableEdit

  Returns:

  true if this edit is alive and hasBeenDone is true

  See Also:

  die(), undo(), redo()

• redo

  public void redo()
            throws CannotRedoException

  Throws CannotRedoException if canRedo returns false. Sets hasBeenDone to true. Subclasses should override to redo the operation represented by this edit. Override should begin with a call to super.

  Specified by:

  redo in interface UndoableEdit

  Throws:

  CannotRedoException - if canRedo returns false

  See Also:

  canRedo()

• canRedo

  public boolean canRedo()

  Returns true if this edit is alive and hasBeenDone is false.

  Specified by:

  canRedo in interface UndoableEdit

  Returns:

  true if this edit is alive and hasBeenDone is false

  See Also:

  die(), undo(), redo()

• addEdit

  public boolean addEdit(UndoableEdit anEdit)

  This default implementation returns false.

  Specified by:

  addEdit in interface UndoableEdit

  Parameters:

  anEdit - the edit to be added

  Returns:

  false

  See Also:

  UndoableEdit.addEdit(javax.swing.undo.UndoableEdit)

• replaceEdit

  public boolean replaceEdit(UndoableEdit anEdit)

  This default implementation returns false.

  Specified by:

  replaceEdit in interface UndoableEdit

  Parameters:

  anEdit - the edit to replace

  Returns:

  false

  See Also:

  UndoableEdit.replaceEdit(javax.swing.undo.UndoableEdit)

• isSignificant

  public boolean isSignificant()

  This default implementation returns true.

  Specified by:

  isSignificant in interface UndoableEdit

  Returns:

  true

  See Also:

  UndoableEdit.isSignificant()

• getPresentationName

  public String getPresentationName()

  This default implementation returns "". Used by getUndoPresentationName and getRedoPresentationName to construct the strings they return. Subclasses should override to return an appropriate description of the operation this edit represents.

  Specified by:

  getPresentationName in interface UndoableEdit

  Returns:

  the empty string ""

  See Also:

  getUndoPresentationName(), getRedoPresentationName()

• getUndoPresentationName

  public String getUndoPresentationName()

  Retreives the value from the defaults table with key AbstractUndoableEdit.undoText and returns that value followed by a space, followed by getPresentationName. If getPresentationName returns "", then the defaults value is returned alone.

  Specified by:

  getUndoPresentationName in interface UndoableEdit

  Returns:

  the value from the defaults table with key AbstractUndoableEdit.undoText, followed by a space, followed by getPresentationName unless getPresentationName is "" in which case, the defaults value is returned alone.

  See Also:

  getPresentationName()

• getRedoPresentationName

  public String getRedoPresentationName()

  Retreives the value from the defaults table with key AbstractUndoableEdit.redoText and returns that value followed by a space, followed by getPresentationName. If getPresentationName returns "", then the defaults value is returned alone.

  Specified by:

  getRedoPresentationName in interface UndoableEdit

  Returns:

  the value from the defaults table with key AbstractUndoableEdit.redoText, followed by a space, followed by getPresentationName unless getPresentationName is "" in which case, the defaults value is returned alone.

  See Also:

  getPresentationName()

• 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