On 5/23/2014 6:12 AM, Jonas Sicking wrote:
That isn't possible with APZ since the user might be actively
scrolling and so if we just do something like
div.scrollTop += hightOfNewContent;
then the newly set scroll position will be based off of an old value
which has already changed on the compositing thread.
Basically we need an API like
div.addToScrollPosition(hightOfNewContent);
This would allow the browser to send this delta to the compositing
thread along with the newly updated painting of the DOM.
Would this allow us to avoid the sync reflow currently required with the
scrollTop approach as well? It would seem the platform would not need
to calculate an exact position in order to apply a delta like this.
Ben
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