… reordering and will/did end reordering. There are runtime check for these optional delegate callback methods but from my opinion they are not in tight loop situation, so I find that there is nothing much to worry about.
…provides an option (alwaysScroll) that still enable scrolling. This behavior is closer to the actual iBook so it is on by default.
…ontal. Embarrassing bug, stupid copying and pasting codes.
… dragging the item to the bottom to activate auto scrolling cause the collection view to layout incorrectly. Ideally I should have prevented the handleScroll from event activating but that will requires refactoring of that part of the code.
…pplementary and decoration view too which is the wrong behavior)
…dragging. - Don't invalidate the layout but instead performs batch update while panning. (Performance boost! :D)