private protected virtual void FindPreferredFrame(IFocusNodeStateView mainStateView, List <IFocusFocus> sameStateFocusableList)
{
bool IsFrameSet = false;
IFocusNodeTemplate Template = mainStateView.Template as IFocusNodeTemplate;
Debug.Assert(Template != null);
Template.GetPreferredFrame(out IFocusNodeFrame FirstPreferredFrame, out IFocusNodeFrame LastPreferredFrame);
Debug.Assert(FirstPreferredFrame != null);
Debug.Assert(LastPreferredFrame != null);
foreach (IFocusFocus CellFocus in sameStateFocusableList)
{
IFocusFocusableCellView CellView = CellFocus.CellView;
if (CellView.Frame == FirstPreferredFrame || CellView.Frame == LastPreferredFrame)
{
IsFrameSet = true;
Focus = CellFocus;
break;
}
}
// If none of the preferred frames are visible, use the first focusable cell.
if (!IsFrameSet)
{
Focus = sameStateFocusableList[0];
}
}
private protected virtual bool GetFocusedStateAndChildren(FocusFocusList newFocusChain, IFocusNodeState state, out IFocusNodeStateView mainStateView, out List <IFocusNodeStateView> stateViewList, out List <IFocusFocus> sameStateFocusableList)
{
mainStateView = (IFocusNodeStateView)StateViewTable[state];
stateViewList = new List <IFocusNodeStateView>();
sameStateFocusableList = new List <IFocusFocus>();
GetChildrenStateView(mainStateView, stateViewList);
// Find all focusable cells belonging to these states.
foreach (IFocusFocus NewFocus in newFocusChain)
{
IFocusFocusableCellView CellView = NewFocus.CellView;
foreach (IFocusNodeStateView StateView in stateViewList)
{
if (CellView.StateView == StateView && !sameStateFocusableList.Contains(NewFocus))
{
sameStateFocusableList.Add(NewFocus);
break;
}
}
}
if (sameStateFocusableList.Count > 0)
{
return(true);
}
// If it doesn't work, try the parent state, down to the root (in case of a removal or unassign).
return(false);
}
/// <summary>
/// Initializes a new instance of the <see cref="FocusFocus"/> class.
/// </summary>
public FocusFocus(IFocusFocusableCellView cellView)
{
CellView = cellView;
}