internal override void OnAttach(DependencyObject d, DependencyProperty dp)
{
if (IsAttached)
{
return;
}
ParentBinding.Seal();
_isAttaching = IsAttached = true;
Target = d;
FindSource();
// FindSource should find the source now. Otherwise, the PropertyPathNodes
// shoud do the work (their properties will change when the source will
// become available)
_propertyPathWalker.Update(_bindingSource);
//Listen to changes on the Target if the Binding is TwoWay:
if (ParentBinding.Mode == BindingMode.TwoWay)
{
_propertyListener = INTERNAL_PropertyStore.ListenToChanged(Target, TargetProperty, UpdateSourceCallback);
// If the user wants to force the Validation of the value when the element
// is added to the Visual tree, we set a boolean to do it as soon as possible:
if (ParentBinding.ValidatesOnExceptions && ParentBinding.ValidatesOnLoad)
{
INTERNAL_ForceValidateOnNextSetValue = true;
}
}
_isAttaching = false;
}
void CompleteSetValue(AsyncSetValueRequest request)
{
AsyncSetValueRequest pendingSetValueRequest = (AsyncSetValueRequest)GetValue(Feature.PendingSetValueRequest, null);
if (pendingSetValueRequest == request)
{
ClearValue(Feature.PendingSetValueRequest);
// if the target has gone away, ignore the request
if (CheckTarget() == null)
{
return;
}
switch (request.Status)
{
case AsyncRequestStatus.Completed:
break;
case AsyncRequestStatus.Failed:
object filteredException = ParentBinding.DoFilterException(ParentBindingExpression, request.Exception);
Exception exception = filteredException as Exception;
ValidationError validationError;
if (exception != null)
{
if (TraceData.IsEnabled)
{
int k = PW.Length - 1;
object value = request.Value;
ReportSetValueError(k, request.TargetItem, request.Value, exception);
}
}
else if ((validationError = filteredException as ValidationError) != null)
{
Validation.MarkInvalid(ParentBindingExpression, validationError);
}
break;
}
}
}
//------------------------------------------------------
//
// Constructors
//
//------------------------------------------------------
internal ClrBindingWorker(BindingExpression b, DataBindEngine engine) : base(b)
{
PropertyPath path = ParentBinding.Path;
if (ParentBinding.XPath != null)
{
path = PrepareXmlBinding(path);
}
if (path == null)
{
path = new PropertyPath(String.Empty);
}
if (ParentBinding.Path == null)
{
ParentBinding.UsePath(path);
}
_pathWorker = new PropertyPathWorker(path, this, IsDynamic, engine);
_pathWorker.SetTreeContext(ParentBindingExpression.TargetElementReference);
}
