Always go through source tile change logic

2019-08-18 11:38:46 +02:00
parent 25c8d93eba
commit a5fbbef970
1 changed files with 66 additions and 62 deletions
@@ -200,13 +200,15 @@ class VectorTile extends UrlTile {
    const minZoom = sourceTileGrid.getMinZoom();

    const previousSourceTiles = this.sourceTilesByTileKey_[tile.getKey()];
+    let sourceTiles, covered, empty, loadedZ;
    if (previousSourceTiles && previousSourceTiles.length > 0 && previousSourceTiles[0].tileCoord[0] === sourceZ) {
-      return previousSourceTiles;
-    }
-
-    const sourceTiles = [];
-    let loadedZ = sourceZ + 1;
-    let covered, empty;
+      sourceTiles = previousSourceTiles;
+      covered = true;
+      empty = false;
+      loadedZ = sourceZ;
+    } else {
+      sourceTiles = [];
+      loadedZ = sourceZ + 1;
      do {
        --loadedZ;
        covered = true;
@@ -268,6 +270,8 @@ class VectorTile extends UrlTile {
          sourceTiles.length = 0;
        }
      } while (!covered && loadedZ > minZoom);
+    }
+
    if (!empty && tile.getState() === TileState.IDLE) {
      tile.setState(TileState.LOADING);
    }