A helper library for FLIP animations.

FLIP is an approach to animations that remaps animating expensive properties, like width, height, left and top to significantly cheaper changes using transforms. It does this by taking two snapshots, one of the element's First position (F), another of its Last position (L). It then uses a transform to Invert (I) the element's changes, such that the element appears to still be in the First position. Lastly it Plays (P) the animation forward by removing the transformations applied in the Invert step.

You can use the FLIP helper on its own, like this:

let flip = new FLIP({
  element: target,
  duration: 2000
});
// First position & opacity.
flip.first();
// Apply the 'end' class and snapshot the last position & opacity.
flip.last('end');
// Move and fade the element back to the original position.
flip.invert();
// Play it forwards.
flip.play();

If you've already got GSAP in place, you may wish for it to handle playback. In which case, you can declare that in the config object:

let flip = new FLIP({
  element: target,
  duration: 2000,
  play: 'GSAP'
});

You can either specify your own function, or, if you're using GSAP, you can use its easing functions:

// Declare an easing function directly.
let flip = new FLIP({
  element: target,
  easing: function (t) {
    return t * t;
  }
});
// ... or declare an easing function from GSAP.
let flip = new FLIP({
  element: target,
  easing: Bounce.easeOut
});

• Demos - There are more to make :)
• API docs.

For more background info take a look at the FLIP intro post.

License: Apache 2.0 - See /LICENSE.

Author: paullewis.

Please note: this is not an official Google product.