Pull getContentRect() into it's own module?

[spalger]

Do you think it would make sense to expose the getContentRect() algorithm implemented here as it's own module? There seems to be a fair amount of logic related to ensuring cross-browser compatibility that I would rather not replicate.

[spalger]

The reason I ask, which might be accomplished a better way:

I'm trying to selectively ignore resize notifications that are caused by a specific function/block.

const eventBus = new EventEmitter();
const el = document.createElement('div');

const observer = new ResizeObserver(() => {
  if (someCondition()) {
    eventBus.emit('resize')
  }
})

observer.observe(el);

modifySizeWithoutTriggeringResize(() => {
  // modifications to the size of the element can be made within this function
  // and will not trigger a "resize" event on the event bus
  $(el).height(100);
});

In order to accomplish this I am thinking that I will:

1. Run the function passed to modifyWithoutTriggeringResize() to completion
2. Create an expectedContentRects map, mapping all tracked elements to their current contentRect
3. On the next notification from the ResizeObserver, ignore any resize entry with a contentRect that matches the rect in the expectedContentRects map.
4. If all resize entries are ignored, do not emit the "resize" event on the bus.

[spalger]

Decided to use the same function to get the size of the element before the notification and within the notification so that I'm not reliant on the implementation here. Sorry for the noise.