org.biolegato.gdesupport.canvas.undo
Class UndoMulti

java.lang.Object
  org.biolegato.gdesupport.canvas.undo.UndoMulti

All Implemented Interfaces:

Undoable

public class UndoMulti
extends java.lang.Object
implements Undoable

This object contains a linked list of related undoable objects. This is used to amalgomate undoable objects together to provide undo support for complex operations.

Author:

Graham Alvare, Brian Fristensky

Constructor Summary

UndoMulti()
Creates a new instance of UndoMulti

UndoMulti(java.util.List<Undoable> list)
Creates a new instance of UndoMulti from a linked list

Method Summary

void	addUndo(Undoable object) Adds an undoable to the undo multi
boolean	isEmpty() Checks if the undo multi contains any undoable objects
Undoable	undo() Undoes a multitude of undoable objects

Methods inherited from class java.lang.Object

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

Constructor Detail

UndoMulti

public UndoMulti()

Creates a new instance of UndoMulti

UndoMulti

public UndoMulti(java.util.List<Undoable> list)

Creates a new instance of UndoMulti from a linked list

Parameters:

list - the list to create the UndoMulti from.

Method Detail

addUndo

public void addUndo(Undoable object)

Adds an undoable to the undo multi

Parameters:

object - the undoable object to add.

undo

public Undoable undo()

Undoes a multitude of undoable objects

Specified by:

undo in interface Undoable

Returns:

an object which can redo the undone operation.

isEmpty

public boolean isEmpty()

Checks if the undo multi contains any undoable objects

Returns:

true if the undo multi list contains any undoable objects