[LeftNav] Feature/swipe to open

[pomerantsev]

Resolves #848.

[hai-cea]

@pomerantsev I think it works pretty well. One thing that does feel weird is that the nav menu will open on a left swipe as well as a right swipe. It seems like it should only open on a swipe to the right?

Same issue with closing the menu, it should only close with a swipe to the left. But, that issue seems to have always been there.

[pomerantsev]

@hai-cea I created an issue #900.
The way I fixed it here is I'm just calculating whether the nav panel is more than half way open or not, and I'm opening or closing it based on that.
So no matter which way you're swiping now, the nav will only close if you've swiped sufficiently.
The ratio can be adjusted. Say, you need to swipe 20% or even just one pixel in the desired direction, but implementing it like this (with a middle point) was slightly easier.

[hai-cea]

@pomerantsev ok looks great 👍 Thanks!

[CumpsD]

Nice one! Looking forward to the next release :)

[CumpsD]

I'm getting all kinds of weird behavior with this. I swipe the menu in from the left, I tap next to it (it closes automatically), I tap anywhere again, it pops open again (without the dark background overlay), and then it is in a weird state where tapping on it closes it (without animation).

[pomerantsev]

@CumpsD thanks for noticing it.