| swipe event (delta 0 0, phase 'maybegin') | |
| scroll event (delta 1 0, phase 'began') | |
| scroll event (delta 1 0, phase 'changed') | |
| didBeginSwipe | |
| swipe event (delta 1 0, phase 'changed') | |
| swipe event (delta 256 0, phase 'changed') | |
| swipe event (delta 0 0, phase 'ended') | |
| willEndSwipe | |
| didEndSwipe | |
| didRemoveSwipeSnapshot | |