com.goodow.realtime.operation.undo

接口 UndoManager<T>

类型参数:

T - The type of operations.

所有已知子接口:

UndoManagerPlus<T>

所有已知实现类:

UndoManagerImpl

public interface UndoManager<T>

An undo manager.

方法概要

方法

限定符和类型	方法和说明
boolean	canRedo()
boolean	canUndo()
void	checkpoint() Places an undo checkpoint.
void	nonUndoableOp(T op) Places into the undo manager an operation that should not be undone by undos.
List<T>	redo() Effects a redo.
List<T>	undo() Effects an undo.
void	undoableOp(T op) Places into the undo manager an operation that should be undone by undos.

方法详细资料

canRedo

boolean canRedo()

返回:

True if the model can currently redo.

canUndo

boolean canUndo()

返回:

True if the model can currently undo.

checkpoint

void checkpoint()

Places an undo checkpoint.

nonUndoableOp

void nonUndoableOp(T op)

Places into the undo manager an operation that should not be undone by undos.

参数:

op - the operation that should not be undone by any undos

redo

List<T> redo()

Effects a redo. Returns null if there are no operations to redo.

返回:

the operation that will effect a redo

undo

List<T> undo()

Effects an undo. Returns null if there are no operations to undo.

返回:

the operation that will effect an undo

undoableOp

void undoableOp(T op)

Places into the undo manager an operation that should be undone by undos.

参数:

op - the operation that should be undone by an appropriate undo