Package org.apache.hop.core.gui

Interface IUndo

All Known Implementing Classes:

AbstractMeta, PipelineMeta, WorkflowMeta

public interface IUndo

Method Summary

Modifier and Type	Method	Description
void	addUndo(Object[] from, Object[] to, int[] pos, Point[] prev, Point[] curr, int typeOfChange, boolean nextAlso)	Add an undo operation to the undo list
int	getMaxUndo()	Get the maximum number of undo operations possible
ChangeAction	nextUndo()	Get the next undo transaction on the list.
ChangeAction	previousUndo()	Get the previous undo operation and change the undo pointer
void	setMaxUndo(int mu)	Sets the maximum number of undo operations that are allowed.
ChangeAction	viewNextUndo()	Get the next undo transaction on the list.
ChangeAction	viewPreviousUndo()	View previous undo, don't change undo position
ChangeAction	viewThisUndo()	View current undo, don't change undo position

Method Detail

addUndo

void addUndo(Object[] from,
             Object[] to,
             int[] pos,
             Point[] prev,
             Point[] curr,
             int typeOfChange,
             boolean nextAlso)

Add an undo operation to the undo list

Parameters:

from - array of objects representing the old state

to - array of objectes representing the new state

pos - An array of object locations

prev - An array of points representing the old positions

curr - An array of points representing the new positions

type_of_change - The type of change that's being done to the pipeline.

nextAlso - indicates that the next undo operation needs to follow this one.

getMaxUndo

int getMaxUndo()

Get the maximum number of undo operations possible

Returns:

The maximum number of undo operations that are allowed.

setMaxUndo

void setMaxUndo(int mu)

Sets the maximum number of undo operations that are allowed.

Parameters:

mu - The maximum number of undo operations that are allowed.

previousUndo

ChangeAction previousUndo()

Get the previous undo operation and change the undo pointer

Returns:

The undo transaction to be performed.

viewThisUndo

ChangeAction viewThisUndo()

View current undo, don't change undo position

Returns:

The current undo transaction

viewPreviousUndo

ChangeAction viewPreviousUndo()

View previous undo, don't change undo position

Returns:

The previous undo transaction

nextUndo

ChangeAction nextUndo()

Get the next undo transaction on the list. Change the undo pointer.

Returns:

The next undo transaction (for redo)

viewNextUndo

ChangeAction viewNextUndo()

Get the next undo transaction on the list.

Returns:

The next undo transaction (for redo)