javax.swing.undo
Class CompoundEdit

java.lang.Object
  javax.swing.undo.AbstractUndoableEdit
      javax.swing.undo.CompoundEdit

All Implemented Interfaces:

Serializable, UndoableEdit

Direct Known Subclasses:

AbstractDocument.DefaultDocumentEvent, UndoManager

public class CompoundEdit

extends AbstractUndoableEdit

A concrete subclass of AbstractUndoableEdit, used to assemble little UndoableEdits into great big ones.

Author:

Ray Ryan

See Also:

Serialized Form

Field Summary

protected Vector	edits The collection of UndoableEdits undone/redone en masse by this CompoundEdit.
(package private) boolean	inProgress True if this edit has never received end.

Fields inherited from class javax.swing.undo.AbstractUndoableEdit

alive, hasBeenDone, RedoName, UndoName

Constructor Summary

CompoundEdit()

Method Summary

boolean	addEdit(UndoableEdit anEdit) If this edit is inProgress, accepts anEdit and returns true.
boolean	canRedo() Returns false if isInProgress or if super returns false.
boolean	canUndo() Returns false if isInProgress or if super returns false.
void	die() Sends die to each subedit, in the reverse of the order that they were added.
void	end() Sets inProgress to false.
String	getPresentationName() Returns getPresentationName from the last UndoableEdit added to edits.
String	getRedoPresentationName() Returns getRedoPresentationName from the last UndoableEdit added to edits.
String	getUndoPresentationName() Returns getUndoPresentationName from the last UndoableEdit added to edits.
boolean	isInProgress() Returns true if this edit is in progress--that is, it has not received end.
boolean	isSignificant() Returns true if any of the UndoableEdits in edits do.
protected UndoableEdit	lastEdit() Returns the last UndoableEdit in edits, or null if edits is empty.
void	redo() Sends redo to all contained UndoableEdits in the order in which they were added.
String	toString() Returns a string that displays and identifies this object's properties.
void	undo() Sends undo to all contained UndoableEdits in the reverse of the order in which they were added.

Methods inherited from class javax.swing.undo.AbstractUndoableEdit

replaceEdit

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

inProgress

boolean inProgress

True if this edit has never received end.

edits

protected Vector edits

The collection of UndoableEdits undone/redone en masse by this CompoundEdit.

Constructor Detail

CompoundEdit

public CompoundEdit()

Method Detail

undo

public void undo()
          throws CannotUndoException

Sends undo to all contained UndoableEdits in the reverse of the order in which they were added.

Specified by:

undo in interface UndoableEdit

Overrides:

undo in class AbstractUndoableEdit

Throws:

CannotUndoException - if canUndo returns false

See Also:

AbstractUndoableEdit.canUndo()

redo

public void redo()
          throws CannotRedoException

Sends redo to all contained UndoableEdits in the order in which they were added.

Specified by:

redo in interface UndoableEdit

Overrides:

redo in class AbstractUndoableEdit

Throws:

CannotRedoException - if canRedo returns false

See Also:

AbstractUndoableEdit.canRedo()

lastEdit

protected UndoableEdit lastEdit()

Returns the last UndoableEdit in edits, or null if edits is empty.

die

public void die()

Sends die to each subedit, in the reverse of the order that they were added.

Specified by:

die in interface UndoableEdit

Overrides:

die in class AbstractUndoableEdit

addEdit

public boolean addEdit(UndoableEdit anEdit)

If this edit is inProgress, accepts anEdit and returns true.

The last edit added to this CompoundEdit is given a chance to addEdit(anEdit). If it refuses (returns false), anEdit is given a chance to replaceEdit the last edit. If anEdit returns false here, it is added to edits.

Specified by:

addEdit in interface UndoableEdit

Overrides:

addEdit in class AbstractUndoableEdit

Parameters:

anEdit - the edit to be added

Returns:

true if the edit is inProgress; otherwise returns false

See Also:

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

end

public void end()

Sets inProgress to false.

See Also:

canUndo(), canRedo()

canUndo

public boolean canUndo()

Returns false if isInProgress or if super returns false.

Specified by:

canUndo in interface UndoableEdit

Overrides:

canUndo in class AbstractUndoableEdit

Returns:

true if this edit is alive and hasBeenDone is true

See Also:

isInProgress()

canRedo

public boolean canRedo()

Returns false if isInProgress or if super returns false.

Specified by:

canRedo in interface UndoableEdit

Overrides:

canRedo in class AbstractUndoableEdit

Returns:

true if this edit is alive and hasBeenDone is false

See Also:

isInProgress()

isInProgress

public boolean isInProgress()

Returns true if this edit is in progress--that is, it has not received end. This generally means that edits are still being added to it.

See Also:

end()

isSignificant

public boolean isSignificant()

Returns true if any of the UndoableEdits in edits do. Returns false if they all return false.

Specified by:

isSignificant in interface UndoableEdit

Overrides:

isSignificant in class AbstractUndoableEdit

Returns:

true

See Also:

UndoableEdit.isSignificant()

getPresentationName

public String getPresentationName()

Returns getPresentationName from the last UndoableEdit added to edits. If edits is empty, calls super.

Specified by:

getPresentationName in interface UndoableEdit

Overrides:

getPresentationName in class AbstractUndoableEdit

Returns:

the empty string ""

See Also:

AbstractUndoableEdit.getUndoPresentationName(), AbstractUndoableEdit.getRedoPresentationName()

getUndoPresentationName

public String getUndoPresentationName()

Returns getUndoPresentationName from the last UndoableEdit added to edits. If edits is empty, calls super.

Specified by:

getUndoPresentationName in interface UndoableEdit

Overrides:

getUndoPresentationName in class AbstractUndoableEdit

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:

AbstractUndoableEdit.getPresentationName()

getRedoPresentationName

public String getRedoPresentationName()

Returns getRedoPresentationName from the last UndoableEdit added to edits. If edits is empty, calls super.

Specified by:

getRedoPresentationName in interface UndoableEdit

Overrides:

getRedoPresentationName in class AbstractUndoableEdit

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:

AbstractUndoableEdit.getPresentationName()

toString

public String toString()

Returns a string that displays and identifies this object's properties.

Overrides:

toString in class AbstractUndoableEdit

Returns:

a String representation of this object