protected virtual void ClearSubViewModel()
{
foreach (var subVMItem in SubVMItemsCollection)
{
SubViewModelEventsUnregister(subVMItem);
if (IsSubVMNeedDispose && subVMItem is IDisposable disposableItem)
{
disposableItem.Dispose();
}
}
_model2VMDic.Clear();
SubVMItemsCollection.Clear();
}
protected virtual void RemoveSubViewModel(TSubM subModelItem)
{
if (_model2VMDic.ContainsKey(subModelItem))
{
var oldSubVMItem = _model2VMDic[subModelItem];
SubViewModelEventsUnregister(oldSubVMItem);
SubVMItemsCollection.Remove(oldSubVMItem);
_model2VMDic.Remove(subModelItem);
if (IsSubVMNeedDispose && oldSubVMItem is IDisposable disposableItem)
{
disposableItem.Dispose();
}
}
//else
// throw new Exception("Can't find the related sub ViewModel object.");
}
protected virtual void ReplaceSubViewModel(TSubM oldSubModelItem, TSubM newSubModelItem, int index)
{
if (_model2VMDic.ContainsKey(oldSubModelItem))
{
var oldSubVMItem = _model2VMDic[oldSubModelItem];
SubViewModelEventsUnregister(oldSubVMItem);
_model2VMDic.Remove(oldSubModelItem);
if (IsSubVMNeedDispose && oldSubVMItem is IDisposable disposableItem)
{
disposableItem.Dispose();
}
var newSubVMItem = GetSubViewModelInstance(newSubModelItem);
SubViewModelEventsRegister(newSubVMItem);
_model2VMDic[newSubModelItem] = newSubVMItem;
SubVMItemsCollection.Add(newSubVMItem);
}
//else
// throw new Exception("The sub VM object related to oldSubModelItem dose not exist.");
}
protected virtual void MoveSubViewModel(int oldIndex, int newIndex)
{
SubVMItemsCollection.Move(oldIndex, newIndex);
}