| Package | com.yworks.support |
| Class | public class MementoUndoUnit |
| Inheritance | MementoUndoUnit  AbstractUndoUnit Object |
IUndoUnit implementation that uses a IMementoSupport
to track, undo, and redo state changes on a given subject.
| Method | Defined By | ||
|---|---|---|---|
MementoUndoUnit(support:IMementoSupport, subject:Object, oldState:Object, undoName:String = null, redoName:String = null)
Initializes this unit using a given support instance, the subject and the state that to which
this unit should undo initially. | MementoUndoUnit | ||
[override]
Merges this unit if unit is of this type and they describe the same subject. | MementoUndoUnit | ||
 | canRedo():Boolean
Determines whether this instance can currently redo its work. | AbstractUndoUnit | |
| canUndo():Boolean
Determines whether this instance can currently undo its work. | AbstractUndoUnit | |
| dispose():void
Frees all used resources. | AbstractUndoUnit | |
| redo():void
Redoes the change that is represented by this unit. | AbstractUndoUnit | |
replaceUnit(unit:IUndoUnit):Boolean [override]
Replaces this unit if unit is of this type and they describe the same subject. | MementoUndoUnit | ||
toString():String | MementoUndoUnit | ||
| undo():void
Undoes the change that is represented by this unit. | AbstractUndoUnit | |
| Method | Defined By | ||
|---|---|---|---|
redoImpl():void [override]
Stores the current state and applies the state saved in undoImpl. | MementoUndoUnit | ||
undoImpl():void [override]
Reads the current state and applies the old one. | MementoUndoUnit | ||
| MementoUndoUnit | () | Constructor |
Hide Inherited Public Properties
Show Inherited Public Propertiespublic function MementoUndoUnit(support:IMementoSupport, subject:Object, oldState:Object, undoName:String = null, redoName:String = null)Initializes this unit using a given support instance, the subject and the state that to which this unit should undo initially.
Parameterssupport:IMementoSupport — The support that will be used to update and apply the state.
| |
subject:Object — The instance that will be modified.
| |
oldState:Object — The memento state object to which the subject will be rolled back
upon the first undo operation.
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undoName:String (default = null) | |
redoName:String (default = null) |
| addUnit | () | method |
override public function addUnit(unit:IUndoUnit):Boolean
Merges this unit if unit is of this type and they describe the same subject.
Parameters
unit:IUndoUnit — The unit to add.
|
Boolean — true if the unit was added.
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| redoImpl | () | method |
override protected function redoImpl():void
Stores the current state and applies the state saved in undoImpl.
| replaceUnit | () | method |
override public function replaceUnit(unit:IUndoUnit):Boolean
Replaces this unit if unit is of this type and they describe the same subject.
Parameters
unit:IUndoUnit — The unit to replace.
|
Boolean — true if the unit was replaced.
|
| toString | () | method |
public function toString():StringReturnsString |
| undoImpl | () | method |
override protected function undoImpl():voidReads the current state and applies the old one.