TiledVectorLayer

Reusable base for tiled vector layers (WFS features, MVT vector tiles, OSM buildings). Owns the parts every such layer shares so they aren't reimplemented per layer:

• Selection — a screen-space-error quadtree over a LevelSet (Tile.mustSubdivide + frustum culling), the same machinery the imagery layer uses; the tile scheme (geographic vs Web-Mercator slippy) is the caller's LevelSet/TileFactory.

• Transitions — each frame doRender assembles a single non-overlapping cut: for every visible ground cell it draws the best-available tile, substituting a coarser ancestor (zoom-in) or finer resident descendants (zoom-out) while the ideal tile loads. A tile is RENDERED or REFINED, never both, so there is no blank gap and no double-paint of translucent fills.

• Lifecycle — an LRU content cache, an in-flight pending set, exponential backoff, an off-thread fetch → render-thread drain channel, stale-while-revalidate invalidation, and globe-state invalidation.

Subclasses provide only the content type C and three things: how to loadTileContent, how to renderTileContent, and (if the content owns GPU buffers) how to release it in onContentEvicted. The thin per-frame seams beginFrame/endFrame/prepareTileForRender cover cross-tile passes (e.g. MVT label collision) and per-frame content tweaks (e.g. MVT line zoom-scale). Always close.

Type Parameters

Inheritors