A Dart wrapper for the Resize Observer API that uses JS interop. It works under both Dart 1 and 2 but since it now exists in the dart:html package in Dart 2, I would recommend just using the built in one under Dart 2 and this version under Dart 1.


// bool if the browser supports the Resize Observer API

// Start observing an element for resizes
ResizeObserver.observe(Element element, ResizeObserverCallback callback);

// Stop observing resizes to [element]
ResizeObserver.unobserve(Element element);

// Callbacks must match the following signature
typedef void ResizeObserverCallback(Element element, num x, num y, num width, num height, num top, num bottom, num left, num right);

See the example for an example of how to use it.