private protected virtual bool IsExtremumCheckParent(IFocusNodeState state, IFocusContentFocusableCellView cellView, System.Func <IFocusNodeState, IFocusContentFocusableCellView, bool> isGoodFocusableCellView, System.Func <int, int> getInsertPosition, out IFocusCollectionInner inner, out IFocusInsertionCollectionNodeIndex index)
{
inner = null;
index = null;
bool Result = false;
IFocusNodeState ParentState = state.ParentState;
if (ParentState != null && isGoodFocusableCellView(state, cellView))
{
Result = IsListExtremumItem(ParentState, cellView, isGoodFocusableCellView, getInsertPosition, out inner, out index);
}
return(Result);
}
private protected virtual bool IsLastFocusableCellView(IFocusNodeState state, IFocusContentFocusableCellView cellView)
{
Debug.Assert(StateViewTable.ContainsKey(state));
IFocusNodeStateView StateView = (IFocusNodeStateView)StateViewTable[state];
StateView.RootCellView.EnumerateVisibleCellViews(GetLastFocusable, out IFrameVisibleCellView FirstCellView, reversed: true);
return(FirstCellView == cellView);
}
private protected virtual bool IsListExtremumItem(IFocusNodeState state, IFocusContentFocusableCellView cellView, System.Func <IFocusNodeState, IFocusContentFocusableCellView, bool> isGoodFocusableCellView, System.Func <int, int> getInsertPosition, out IFocusCollectionInner inner, out IFocusInsertionCollectionNodeIndex index)
{
inner = null;
index = null;
IFocusInner ParentInner = state.ParentInner;
if (ParentInner == null)
{
return(false);
}
Node NewItem;
int BlockPosition;
int ItemPosition;
bool IsHandled = false;
bool Result = false;
switch (ParentInner)
{
case IFocusPlaceholderInner AsPlaceholderInner:
case IFocusOptionalInner AsOptionalInner:
Result = IsExtremumCheckParent(state, cellView, isGoodFocusableCellView, getInsertPosition, out inner, out index);
IsHandled = true;
break;
// Check the parent state if there is a deeper list (typically, for a qualified name, there would be one).
case IFocusListInner AsListInner:
if (IsDeepestList(state))
{
NewItem = NodeHelper.CreateDefaultFromType(AsListInner.InterfaceType);
ItemPosition = (state.ParentIndex as IFocusBrowsingListNodeIndex).Index;
inner = AsListInner;
index = CreateListNodeIndex(inner.Owner.Node, inner.PropertyName, NewItem, getInsertPosition(ItemPosition));
Result = true;
}
else
{
Result = IsExtremumCheckParent(state, cellView, isGoodFocusableCellView, getInsertPosition, out inner, out index);
}
IsHandled = true;
break;
case IFocusBlockListInner AsBlockListInner:
NewItem = NodeHelper.CreateDefaultFromType(AsBlockListInner.InterfaceType);
BlockPosition = (state.ParentIndex as IFocusBrowsingExistingBlockNodeIndex).BlockIndex;
ItemPosition = (state.ParentIndex as IFocusBrowsingExistingBlockNodeIndex).Index;
inner = AsBlockListInner;
index = CreateExistingBlockNodeIndex(inner.Owner.Node, inner.PropertyName, NewItem, BlockPosition, getInsertPosition(ItemPosition));
Result = true;
IsHandled = true;
break;
}
Debug.Assert(IsHandled);
return(Result);
}