Here's a rough draft proposal for an extension to the
animated component that can handle both simple and advanced FLIP use cases.
1. Simplest example
Initiate a FLIP animation on a component by updating the
2. Two different components example
Match unconnected components across renders by making sure they share the same
flipId prop, and when one unmounts and the other mounts, they will be connected with a FLIP animation.
3. Advanced custom spring example
Occasionally, like in the example below, users will want to be able to FLIP pre-existing springs, if for instance a FLIP could be interrupted by a drag.
The api allows for this as well, by passing in a
flipSet prop in addition to a
Proposed extension to animated component
This is a first draft of the code wrapping the
animated component to make the above three use cases possible.
AnimationHandler outer wrapper attempts to simplify the most common use cases. However, if you pass in the
flipSet prop you can bypass this
to get total control of the animation to facilitate interruptability and more complex effects.
- Think about improving or simplifying
- Figure out chained staggering of FLIP components and/or whether it is necessary (react-flip-toolkit supports it).
- Figure out how to lazily import FLIP functionality into
animatedso as not to bloat the bundle for users who don't need FLIP. (or perhaps just have a
FlippableAnimatedcomponent or similar?)
- Make the springs customizable for abstracted FLIP cases (like examples one and two). this would be easy with a
flipSpringprop or something but that might start making the api too complex.
Built a really simple example.
Works only with context parent "Flip"
And functional component "FlipItem" which just renders an animated div and registers itself in the context.
Runs useLayoutEffect every update and if their DOMRects normalized against where they would be with no transform (this is important) then they wont animate.
Uses matrix math (scale is useless just there as a placeholder).
There might be some drag-and-drop logic floating around because i had to rip my dnd stuff out of this implementation to just show the flip stuff but my real-world usecase for flip is more for drag-and-drop.
What iv'e learnt:
Must compute position logic as if transforms aren't applied.
Can't really use the inbuilt animated.div myself without forking react-spring but ideally it would just be animated.div id="xyz"
Must use context to provide seemless multi-parent transitions.
Can use either useLayoutEffect OR getSnapshotBeforeUpdate
Doesn't animate height/width to keep it simple however this would be very easy to add
EDIT: My drag-and-drop implementation utilizing flip is almost done but haven't had time to work on it but the only thing missing is multi-container drop. Implementing flip you can build drag-and-drop without ANY position math for moving elements around.