org.gvsig.tools.undo
Interface UndoRedoStack

All Superinterfaces:

Observable, WeakReferencingObservable

All Known Subinterfaces:

UndoRedoCommandStack

All Known Implementing Classes:

DefaultUndoRedoCommandStack

public interface UndoRedoStack
extends WeakReferencingObservable

An Stack of Undo/Redo operations.

Author:

Cèsar Ordiñana

Method Summary

boolean	canRedo() If a redo can be performed on the stack.
boolean	canUndo() If an undo can be performed on the stack.
List	getRedoInfos() Returns the list of UndoRedoInfo in the REDO stack
List	getUndoInfos() Returns the list of UndoRedoInfo in the UNDO stack
void	redo() Re-does the following redoable elements.
void	redo(int num) Re-does a number of the following redoable element.
void	undo() Undoes the following undoable elements.
void	undo(int num) Undoes a number of the following undoable elements.

Methods inherited from interface org.gvsig.tools.observer.Observable

addObserver, deleteObserver, deleteObservers

Method Detail

undo

void undo()
          throws UndoException

Undoes the following undoable elements.

Throws:

UndoException - if there is an error performing de undo element

undo

void undo(int num)
          throws UndoException

Undoes a number of the following undoable elements.

Parameters:

num - the number of elements to undo

Throws:

UndoException - if there is an error performing de undo element

redo

void redo()
          throws RedoException

Re-does the following redoable elements.

Throws:

RedoException - if there is an error performing de redo element

redo

void redo(int num)
          throws RedoException

Re-does a number of the following redoable element.

Parameters:

num - the number of elements to redo

Throws:

RedoException - if there is an error performing de redo element

getUndoInfos

List getUndoInfos()

Returns the list of UndoRedoInfo in the UNDO stack

Returns:

list of UndoRedoInfo in the UNDO stack

getRedoInfos

List getRedoInfos()

Returns the list of UndoRedoInfo in the REDO stack

Returns:

list of UndoRedoInfo in the REDO stack

canUndo

boolean canUndo()

If an undo can be performed on the stack.

Returns:

an undo can be performed

canRedo

boolean canRedo()

If a redo can be performed on the stack.

Returns:

a redo can be performed