public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value)
{
var registry = AvaloniaPropertyRegistry.Instance;
var parser = new PropertyParser();
var(ns, owner, propertyName) = parser.Parse(new CharacterReader(((string)value).AsSpan()));
var ownerType = TryResolveOwnerByName(context, ns, owner);
var targetType = context.GetFirstParent <ControlTemplate>()?.TargetType ??
context.GetFirstParent <Style>()?.Selector?.TargetType ??
typeof(Control);
var effectiveOwner = ownerType ?? targetType;
var property = registry.FindRegistered(effectiveOwner, propertyName);
if (property == null)
{
throw new XamlLoadException($"Could not find property '{effectiveOwner.Name}.{propertyName}'.");
}
if (effectiveOwner != targetType &&
!property.IsAttached &&
!registry.IsRegistered(targetType, property))
{
Logger.TryGet(LogEventLevel.Warning)?.Log(
LogArea.Property,
this,
"Property '{Owner}.{Name}' is not registered on '{Type}'.",
effectiveOwner,
propertyName,
targetType);
}
return(property);
}
private void ConnectAnchor(ITypeDescriptorContext context)
{
// This is a horrible hack to have the control keep the binding alive.
_anchor.Tag = this;
var window = context.GetFirstParent <Window>();
if (window is null)
{
var userControl = context.GetFirstParent <UserControl>();
userControl.AttachedToLogicalTree += DelayedSubscribe;
}
else
{
Subscribe(window);
}
}
void ConnectAnchor(ITypeDescriptorContext context)
{
// This is a horrible hack to have the control keep the binding alive.
var window = context.GetFirstParent <Window>();
_anchor.Tag = this;
WeakEventHandlerManager.Subscribe <Window, EventArgs, LocalizedResourceExtension>(window, nameof(Window.Closed), DisconnectAnchor);
}