* On the web, load different maps by making asynchronous HTTP calls. #21
This is a very strange, specializd approach; it's unclear how it'll
generalize to reading scenarios and prebaked results. Ideally we could
call abstutil::read_binary as we currently do and somehow hide this async
trickery underneath, but I'm not sure how yet. In the meantime, this
moves us forward with the hack well-contained.
Next steps for web: stop bundling in all of data/system in the .wasm,
now that we can load from HTTP.
imported, because they referenced way IDs from before the service road
import. That happened after a bad Cargo.lock merge undid the effects of
pinning to the latest seattle_traffic_signals.
When I added web support in February, it was easier to get started with
stdweb, since it has the nice cargo web tool. However, stdweb is
unmaintained, winit is deprecating support for it, and the next steps
for web (downloading maps dynamically) have better support for web-sys.
With Alvin's guidance, I got
https://github.com/dabreegster/minimal_websys_winit_glow_demo working
first. This PR cuts A/B Street over too.
I tested abst and the widgetry demo in both native and web. The only
major regression from stdweb is the canvas placement and size. I
attempted some fixes, but at this point, I'll leave it as a smaller
followup instead.
* match unfork to fork
TBH I don't know of problem currently being caused by this, but it
seemed wrong to unfork without a matching fork.
* variable rename (no behavior change)
"c" was holdover from when panels were called composites
* resize container dims when window resizes
* make panel.top_level private
* Show/Hide scrollbars as window is resized
* alignment demo
* Fix scrollbar positioning
* separate out scrollbar work so we can profile it easier
* mem::replace is more concise than mem::swap
* fixup size of MaxPercent
* restore scroll position after redrawing scroll bars
only allow the leftmost source lane to turn to any destination lane. As
a future improvment, need to handle multiple explicitly tagged left turn
lanes, but this gets closer to reality, particularly helping some crazy
maneuvers along Mercer in downtown.
*or right
Also had to update lanes along Madison and fiddle a bit to keep
lakeslice running. Spotted some major traffic signal bottlenecks due to
stage generation falling back, will iterate on that separately.
