startAnimation: function(
refKey: string,
duration: number,
delay: number,
easing: (string | EasingFunction),
properties: {[key: string]: any}
): number {
var ref = this.refs[refKey];
invariant(
ref,
'Invalid refKey ' + refKey + '; ' +
'valid refs: ' + JSON.stringify(Object.keys(this.refs))
);
var nodeHandle = +ref.getNodeHandle();
var easingSample = AnimationUtils.evaluateEasingFunction(duration, easing);
var tag: number = RCTAnimationManager.startAnimation(nodeHandle, AnimationUtils.allocateTag(), duration, delay, easingSample, properties);
return tag;
},
stopAnimation: function(tag: number) {
RCTAnimationManager.stopAnimation(tag);
},