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V3-11: offline tile pre-download along a route corridor

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Three pure modules: tile_math.dart (tilesForBounds/tilesAlongRoute, hard cap enforced by throwing), tile_cache.dart (FileTileCache with LRU eviction before any write that would exceed the cap), tile_downloader.dart (sequential, rate-limited, cooperatively cancellable, one bad tile doesn't abort the rest). CachedTileProvider wires the cache into flutter_map via a custom ImageProvider and now backs RideMap and RoutePlannerScreen's tile layers, so ordinary viewing write-throughs into the same capped cache.

RoutePlannerScreen gained a route-corridor download action (no rectangle-selection UI -- the ticket names the corridor as strictly better and V3-07 already exists to hang it off of), with a count/size confirmation before any request and a cancellable progress dialog. Fixed a real bug before shipping: a StatefulBuilder-based progress dialog would have started a new overlapping download subscription on every single progress tick; moved to a dedicated StatefulWidget that subscribes once in initState.

Marked partially done: aeroplane-mode verification on a real device is the ticket's own acceptance criterion and needs a phone this environment doesn't have.
This commit is contained in:
uhryniuk
2026-08-17 19:45:40 -05:00
parent be50448917
commit e4ffafe9e0
16 changed files with 1089 additions and 5 deletions
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@@ -27,7 +27,7 @@ backup are v4 — see [../BACKLOG.md](../BACKLOG.md).
| [V3-08](V3-08-road-routing.md) | Road-snapped routing and ETA | L | V3-07, V3-01 | Not started |
| [V3-09](V3-09-route-following.md) | Follow a planned route | M | V3-04, V3-08 | Not started |
| [V3-10](V3-10-trip-splitting.md) | Trip splitting | S | — | Done |
| [V3-11](V3-11-offline-tiles.md) | Offline tile pre-download | M | V3-04 | Not started |
| [V3-11](V3-11-offline-tiles.md) | Offline tile pre-download | M | V3-04 | Partially done (pipeline shipped; needs aeroplane-mode device verification) |
| [V3-12](V3-12-crash-reporting.md) | Crash reporting | S | — | Partially done (code only; needs a real Sentry DSN + release build) |
| [V3-13](V3-13-real-ride-measurements.md) | Real-ride measurements | M | **riding** | Not started |
| [V3-14](V3-14-gpx-interop.md) | GPX interoperability | S | V3-01 | Partially done (code only; needs real-device verification) |