private static void OnBindPropertyChanged(object bindable, object oldValue, object newValue)
{
var bindings = (string)newValue;
if (string.IsNullOrWhiteSpace(bindings))
{
return;
}
var nativeView = GetNativeViewHandler?.Invoke((BindableObject)bindable);
if (nativeView != null)
{
nativeView.SetBindingMemberValue(AttachedMembersBase.Object.Parent, bindable);
bindable = nativeView;
}
if (XamarinFormsToolkitExtensions.IsDesignMode)
{
XamarinFormsDataBindingExtensions.InitializeFromDesignContext();
var list = BindingServiceProvider.BindingProvider.CreateBindingsFromStringWithBindings(bindable, bindings);
foreach (var binding in list.OfType <InvalidDataBinding>())
{
throw binding.Exception;
}
}
else
{
BindingServiceProvider.BindingProvider.CreateBindingsFromString(bindable, bindings);
}
}
private static void OnHasNativeViewChanged(BindableObject bindable, object oldValue, object newValue)
{
var element = bindable as Element;
if (!(newValue is bool) || element == null)
{
return;
}
if ((bool)newValue)
{
element.ChildAdded += OnChildAdded;
if (GetNativeViewHandler == null)
{
return;
}
var content = XamarinFormsDataBindingExtensions.GetContent(element);
if (content is string)
{
return;
}
var enumerable = content as IEnumerable;
if (enumerable == null)
{
return;
}
foreach (var item in enumerable.OfType <BindableObject>())
{
var nativeView = GetNativeViewHandler.Invoke(item);
nativeView?.SetBindingMemberValue(AttachedMembersBase.Object.Parent, item);
}
}
else
{
element.ChildAdded -= OnChildAdded;
}
}
private static void OnChildAdded(object sender, ElementEventArgs args)
{
var nativeView = GetNativeViewHandler?.Invoke(args.Element);
nativeView?.SetBindingMemberValue(AttachedMembersBase.Object.Parent, args.Element);
}