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javax.swing.undo
Class AbstractUndoableEdit
java.lang.Object
javax.swing.undo.AbstractUndoableEdit
-
All Implemented Interfaces:
-
Serializable
,
UndoableEdit
-
Direct Known Subclasses:
-
AbstractDocument.ElementEdit
,
CompoundEdit
,
DefaultStyledDocument.AttributeUndoableEdit
,
StateEdit
-
public class AbstractUndoableEdit
- extends Object
- implements UndoableEdit, Serializable
An abstract implementation of UndoableEdit, implementing simple responses to all boolean methods in that interface.
Field Summary
|
protected static
String
|
RedoName
String returned by getRedoPresentationName; as of Java 2 platform v1.3.1 this field is no longer used. |
protected static
String
|
UndoName
String returned by getUndoPresentationName; as of Java 2 platform v1.3.1 this field is no longer used. |
Constructor Summary
|
AbstractUndoableEdit
()
Creates an AbstractUndoableEdit which defaults
hasBeenDone
and alive to true. |
Method Summary
|
boolean |
addEdit
(
UndoableEdit
anEdit)
This default implementation returns false. |
boolean |
canRedo
()
Returns true if this edit is alive and hasBeenDone is false. |
boolean |
canUndo
()
Returns true if this edit is alive and hasBeenDone is true. |
void |
die
()
Sets alive to false. |
String
|
getPresentationName
()
This default implementation returns "". |
String
|
getRedoPresentationName
()
Retreives the value from the defaults table with key AbstractUndoableEdit.redoText and returns that value followed by a space, followed by getPresentationName. |
String
|
getUndoPresentationName
()
Retreives the value from the defaults table with key AbstractUndoableEdit.undoText and returns that value followed by a space, followed by getPresentationName. |
boolean |
isSignificant
()
This default implementation returns true. |
void |
redo
()
Throws CannotRedoException if canRedo returns false. |
boolean |
replaceEdit
(
UndoableEdit
anEdit)
This default implementation returns false. |
String
|
toString
()
Returns a string that displays and identifies this object's properties. |
void |
undo
()
Throws CannotUndoException if canUndo returns false. |
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
AbstractUndoableEdit
public AbstractUndoableEdit()
-
Creates an AbstractUndoableEdit which defaults
hasBeenDone
and alive to true.
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