private IElementCollection GetPosition(RowView rowView, out int index)
{
if (Template.ContainerKind == ContainerKind.Row)
{
var placement = GetContainerViewPlacement(rowView.RowPresenter);
if (placement == CurrentContainerViewPlacement.WithinList)
{
index = ContainerViewListStartIndex + GetContainerView(rowView).ContainerOrdinal - ContainerViewList.First.ContainerOrdinal;
}
else if (placement == CurrentContainerViewPlacement.BeforeList)
{
index = HeadScalarElementsCount;
}
else
{
Debug.Assert(placement == CurrentContainerViewPlacement.AfterList);
index = ContainerViewListStartIndex + ContainerViewList.Count;
}
return(ElementCollection);
}
else
{
var blockView = rowView.GetBlockView();
index = blockView.BlockBindingsSplit + (rowView.RowPresenter.Index % FlowRepeatCount);
return(blockView.ElementCollection);
}
}
private void Swap(RowView oldValue, RowView newValue)
{
var oldRowPresenter = oldValue.RowPresenter;
var newRowPresenter = newValue.RowPresenter;
var oldBlockView = oldValue.GetBlockView();
var newBlockView = newValue.GetBlockView();
var oldCollection = GetPosition(oldValue, out int oldIndex);
var newCollection = GetPosition(newValue, out int newIndex);
if (oldCollection == newCollection && oldIndex < newIndex)
{
newCollection.RemoveAt(newIndex);
oldCollection.RemoveAt(oldIndex);
}
else
{
oldCollection.RemoveAt(oldIndex);
newCollection.RemoveAt(newIndex);
}
oldValue.Reload(newRowPresenter);
newValue.Reload(oldRowPresenter);
newValue.SetBlockView(oldBlockView);
oldValue.SetBlockView(newBlockView);
if (oldCollection == newCollection && newIndex < oldIndex)
{
newCollection.Insert(newIndex, oldValue);
oldCollection.Insert(oldIndex, newValue);
}
else
{
oldCollection.Insert(oldIndex, newValue);
newCollection.Insert(newIndex, oldValue);
}
}
private ContainerView GetContainerView(RowView rowView)
{
if (Template.ContainerKind == ContainerKind.Row)
{
return(rowView);
}
else
{
return(rowView.GetBlockView());
}
}
