Delay an animation until a particular event has triggered

[jessepinho]

Hey @aholachek,

Freaking love this library. It's the first FLIP library I've used and it's fantastic. Thanks for your work!

My website uses react-flip-toolkit to animate the homepage images when they're clicked. Sometimes, though, that there's a brief moment when the image is blank before it fills back out again. (It's even longer on slow connections, since it's loading a higher-resolution version of the image.)

What I'd like to do (from a user's point of view) is this:

1. When a user clicks an image, a loading spinner appears over it.
2. When the transitioned image loads, the loading spinner disappears.
3. Then, the animation happens, transitioning between pages.

I can't figure out, though, how to use handleEnterUpdateDelete to wait until the new image is finished loading. Is that possible? There doesn't seem to be a way to have the old and new elements of the transition "know" about each other to do something like this — especially during a route transition.

Thanks for your help!