Is there a way to hide the controls until all images are loaded?

[ajstokar]

When a page first loads the image gallery, the controls are rendered before the images causing the screen to jump. I see there onImageLoad in the gallery items, but didn't see anything at the top level to show if all images have been loaded or not. Ideally I could set the gallery's loading state in the props and pass in how I want it to look while loading images. Is there any way to do this currently?