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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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37
test/route_planner_screen_test.dart
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@@ -164,5 +164,42 @@ void main() {
expect(find.textContaining('no longer exists'), findsOneWidget);
});
screenTest('the offline-tiles download button is disabled with no pins '
'(V3-11)', (tester) async {
final id = await repo.createRoutePlan(1000);
await pumpMap(tester, host(RoutePlannerScreen(routeId: id)));
final button = tester.widget<IconButton>(
find.byKey(const Key('download-tiles')),
);
expect(button.onPressed, isNull);
expect(button.tooltip, contains('Add pins'));
});
screenTest('downloading shows a tile count and size estimate before any '
'request (V3-11)', (tester) async {
final id = await repo.createRoutePlan(1000);
await repo.addWaypoint(id, 51.0, -114.0);
await repo.addWaypoint(id, 51.01, -114.0);
await pumpMap(tester, host(RoutePlannerScreen(routeId: id)));
final button = tester.widget<IconButton>(
find.byKey(const Key('download-tiles')),
);
expect(button.onPressed, isNotNull);
await tester.tap(find.byKey(const Key('download-tiles')));
// Bounded, not pumpAndSettle: the confirmation dialog is safe to settle (no
// network involved yet), but this test stops before confirming, precisely to
// avoid needing a fake HTTP layer for what the pure downloadTiles/tile_cache/
// tile_math test suites already cover directly.
await tester.pump();
await tester.pump(const Duration(milliseconds: 50));
expect(find.textContaining('Download'), findsWidgets);
expect(find.textContaining('tiles?'), findsOneWidget);
expect(find.textContaining('MB'), findsOneWidget);
});
});
}