protected Binding CreateTheBinding(BindingTarget bindingTarget, MyBindingInfo bInfo, Type sourceType,
OSCollection pathListeners, out bool isCustom)
{
System.Diagnostics.Debug.Assert(sourceType != null, "The SourceType should never be null here.");
// One node: 1 parent, 0 intervening objects, the terminal path element is "." -- The binding binds to the source data itself.
// Two nodes: 1 parent, 0 intervening objects, 1 terminal path element.
// Three nodes: 1 parent, 1 intervening object, 1 terminal path element.
// Four nodes: 1 parent, 2 intervening objects, 1 terminal path element.
// The next to last node, must have data, in order to avoid binding warnings.
ObservableSource lastParent = pathListeners[pathListeners.Count - 2];
string strNewPath = pathListeners.GetNewPath(justForDiag: false);
ObservableSourceStatusEnum lastParentStatus = lastParent.Status;
System.Diagnostics.Debug.WriteLine($"Path = {bInfo.PropertyPath.Path}, NewPath = {strNewPath}, " +
$"Terminal Node Status = {lastParentStatus}.");
if (lastParentStatus.IsReadyOrWatching())
{
// Check to see if DataContext holds source property.
// When a DataContext is set via a binding, in some cases,
// bindings that rely on that DataContext may get set
// before the binding that provides the correct DataContext is set.
ObservableSource root = pathListeners[ROOT_INDEX];
if (root.SourceKind == SourceKindEnum.FrameworkElement || root.SourceKind == SourceKindEnum.FrameworkContentElement)
{
string firstChildPathElement = pathListeners[ROOT_INDEX + 1].PathElement;
if (!root.DoesChildExist(firstChildPathElement))
{
System.Diagnostics.Debug.WriteLine($"No Binding is being created. Data is present, but doesn't contain source property: {firstChildPathElement}.");
isCustom = false;
return(null);
}
}
// TODO: What about the original PropertyPath parameters?
PropertyPath newPath = new PropertyPath(strNewPath);
isCustom = lastParent.IsPropBagBased; // .IsPropBagBasedAndNoCustomTypeDescriptors;
return(CreateBinding(bindingTarget, bInfo, sourceType, newPath, isCustom));
}
else
{
System.Diagnostics.Debug.Assert(pathListeners[0].IsListeningForNewDC, "There are no active listeners!");
System.Diagnostics.Debug.WriteLine("No Binding is being created, not enough data.");
isCustom = false;
return(null);
}
}
