private bool IsQualifiedForDeferrer(DeferredElement element)
{
var binding = BindingOperations.GetBinding(element.Element, element.DeferredProperty);
var multiBinding = BindingOperations.GetMultiBinding(element.Element, element.DeferredProperty);
return(null != binding && !DisallowedBindings.Contains(binding.Mode) ||
(null != multiBinding && !DisallowedBindings.Contains(multiBinding.Mode)));
}
private void SetDeferringBinding(DeferredElement element)
{
SetOriginalBinding(element.Element, GetExistingBinding(element));
var value = element.GetValue();
BindingOperations.ClearBinding(element.Element, element.DeferredProperty);
BindingOperations.SetBinding(element.Element, element.DeferredProperty, CreateDeferredBinding(element));
//TODO: Check if need both
element.Element.SetValue(DeferredValueProperty, value);
element.SetValue(value);
}
private void SubmitDeferredValue(DeferredElement element)
{
var value = element.GetValue();
RestoreOriginalBinding(element);
var expression = BindingOperations.GetBindingExpression(element.Element, element.DeferredProperty);
element.SetValue(value);
expression?.UpdateSource();
//TODO: Check if this condiction is needed
if (ElementsInFocus)
{
SetDeferringBinding(element);
}
}
public void AddDeffered(DeferredElement elem)
{
_deferred.Value.Add(elem);
}
private void AddToTrackedElements(DeferredElement element) => _elementsBeingTracked.Add(element);
private bool IsBeingDeferred(DeferredElement element) => _elementsBeingTracked.Contains(element);
private Binding CreateIsFocusedBinding(DeferredElement element) => CreateBinding(element.Element, nameof(IsFocused));
private BindingBase GetExistingBinding(DeferredElement element) => BindingOperations.GetBinding(element.Element, element.DeferredProperty) ?? (BindingBase)BindingOperations.GetMultiBinding(element.Element, element.DeferredProperty);
private Binding CreateDeferredBinding(DeferredElement element) => CreateBinding(element.Element, element.DeferredProperty.Name, BindingMode.OneWay, true, true, UpdateSourceTrigger.PropertyChanged);
private void RestoreOriginalBinding(DeferredElement element)
{
BindingOperations.ClearBinding(element.Element, DeferredValueProperty);
BindingOperations.SetBinding(element.Element, element.DeferredProperty, GetOriginalBinding(element.Element));
}
