Allow hooking into scroll event instead of overriding

[danwenzel]

With the current functionality, you can interact with ember-collection's scroll event. But this requires you to completely override the default scroll-change action.

The docs show the following example as a way to maintain current scroll behavior:

scrollChange(scrollLeft, scrollTop) {
  this.set('scrollLeft', scrollLeft);
  this.set('scrollTop', scrollTop);
}

... but in reality, there is more going on in the default scrollChange event.

As a result, you end up losing some functionality when overriding this function. I tried to do this and ended up with some weird behavior (studdering scrolls at certain zoom levels), so I had to build my own scroll listener.

I propose we build a hook that can be optionally used when calling ember-collection. Then, ember-collection's scroll listener will call this hook function if present and still run its own code.

I'd be happy to create a PR for this if you feel it is a good idea.

[danwenzel]

Any ideas on this? Again, I'm happy to open a PR.

[danwenzel]

Trying again. Anyone have ideas on this?

[Luiz-N]

Is this the kind of thing you're looking for? #137

[danwenzel]

@Luiz-N - Not really... I'm looking for the ability to hook into the existing scroll event, so you can run a custom function when the user scrolls the list.