/// <summary>
/// OperationManagerのUndoStackとマージします。
/// 統合されたOperationはUndoStackから除外されます。
/// Operationが統合された場合OperationManagerのRedoStackはクリアされます。
/// </summary>
/// <param name="operationController"></param>
/// <returns></returns>
public IOperation Merge(IOperationController operationController)
{
if (operationController.CanUndo is false)
{
return(this);
}
if (MergeJudge is null)
{
return(this);
}
var topCommand = operationController.Peek();
var prevValue = PrevProperty;
var mergeInfo = MergeJudge;
while (topCommand is MergeableOperation <T> propertyChangeOperation)
{
if (MergeJudge.CanMerge(propertyChangeOperation.MergeJudge) is false)
{
break;
}
mergeInfo = propertyChangeOperation.MergeJudge;
prevValue = propertyChangeOperation.PrevProperty;
operationController.Pop();
topCommand = operationController.Peek();
}
PrevProperty = prevValue;
MergeJudge = mergeInfo;
return(this);
}
public bool CanMerge(IOperationMergeJudge operationMergeJudge)
{
if (operationMergeJudge is KeyOperationMergeJudge <T> timeStampMergeInfo)
{
return(Equals(Key, timeStampMergeInfo.Key) &&
TimeStamp - timeStampMergeInfo.TimeStamp < Permission);
}
return(false);
}
public MergeableOperation(
Action <T> setter,
T newValue,
T oldValue,
IOperationMergeJudge operationMergeJudge = null)
{
Setter = setter;
PrevProperty = oldValue;
Property = newValue;
MergeJudge = operationMergeJudge;
}
