/// <summary>
/// Handler called every time a state is unassigned in the controller.
/// </summary>
/// <param name="operation">Details of the operation performed.</param>
private protected override void OnStateUnassigned(WriteableAssignmentOperation operation)
{
base.OnStateUnassigned(operation);
IFocusOptionalNodeState State = ((FocusAssignmentOperation)operation).State;
Debug.Assert(State != null);
Debug.Assert(StateViewTable.ContainsKey(State));
}
/// <summary>
/// Get the location in the source code corresponding to this focus.
/// </summary>
/// <param name="node">The node in the source code upon return.</param>
/// <param name="frame">The frame in the template associated to <paramref name="node"/> that indicates where in the node is the focus upon return.</param>
public virtual void GetLocationInSourceCode(out Node node, out IFocusFrame frame)
{
node = null;
frame = null;
// We might be reading the focus of a node that has just been unassigned, so don't assert that IsAssigned == true.
IFocusOptionalNodeState AsOptionalNodeState = CellView.StateView.State as IFocusOptionalNodeState;
if (AsOptionalNodeState == null || AsOptionalNodeState.ParentInner.IsAssigned)
{
node = CellView.StateView.State.Node;
frame = CellView.Frame;
}
}
/// <summary>
/// Updates the focus chain with cells in the tree.
/// </summary>
/// <param name="focusChain">The list of focusable cell views found in the tree.</param>
/// <param name="focusedNode">The currently focused node.</param>
/// <param name="focusedFrame">The currently focused frame in the template associated to <paramref name="focusedNode"/>.</param>
/// <param name="matchingFocus">The focus in <paramref name="focusChain"/> that match <paramref name="focusedNode"/> and <paramref name="focusedFrame"/> upon return.</param>
public virtual void UpdateFocusChain(IFocusFocusList focusChain, INode focusedNode, IFocusFrame focusedFrame, ref IFocusFocus matchingFocus)
{
IFocusDiscreteContentFocus NewFocus = CreateFocus();
focusChain.Add(NewFocus);
if (focusedFrame == Frame)
{
IFocusOptionalNodeState AsOptionalNodeState = StateView.State as IFocusOptionalNodeState;
Debug.Assert(AsOptionalNodeState == null || AsOptionalNodeState.ParentInner.IsAssigned);
if (focusedNode == StateView.State.Node)
{
Debug.Assert(matchingFocus == null);
matchingFocus = NewFocus;
}
}
}
/// <summary>
/// Initializes a new instance of the <see cref="FocusOptionalNodeStateView"/> class.
/// </summary>
/// <param name="controllerView">The controller view to which this object belongs.</param>
/// <param name="state">The optional node state.</param>
public FocusOptionalNodeStateView(FocusControllerView controllerView, IFocusOptionalNodeState state)
: base(controllerView, state)
{
}
