in src/Microsoft.Xaml.Behaviors/Core/ExtendedVisualStateManager.cs [192:236]
private static DependencyProperty LayoutPropertyFromTimeline(Timeline timeline, bool forceRuntimeProperty)
{
PropertyPath path = Storyboard.GetTargetProperty(timeline);
if (path == null || path.PathParameters == null || path.PathParameters.Count == 0)
{
return null;
}
DependencyProperty property = path.PathParameters[0] as DependencyProperty;
if (property != null)
{
if (property.Name == "RuntimeVisibility" && property.OwnerType.Name.EndsWith("DesignTimeProperties", StringComparison.Ordinal))
{
if (!LayoutProperties.Contains(property))
{
LayoutProperties.Add(property);
}
return forceRuntimeProperty ? property : UIElement.VisibilityProperty;
}
else if (property.Name == "RuntimeWidth" && property.OwnerType.Name.EndsWith("DesignTimeProperties", StringComparison.Ordinal))
{
if (!LayoutProperties.Contains(property))
{
LayoutProperties.Add(property);
}
return forceRuntimeProperty ? property : FrameworkElement.WidthProperty;
}
else if (property.Name == "RuntimeHeight" && property.OwnerType.Name.EndsWith("DesignTimeProperties", StringComparison.Ordinal))
{
if (!LayoutProperties.Contains(property))
{
LayoutProperties.Add(property);
}
return forceRuntimeProperty ? property : FrameworkElement.HeightProperty;
}
else if (LayoutProperties.Contains(property))
{
return property;
}
}
return null;
}