Add parameter to control prefetching in tile-based geoservice plugins

Change-Id: I18fc1788f7af0efe76f97257ffe739eb1a96e6cc
Reviewed-by: Alex Blasche <alexander.blasche@qt.io>

1 files changed, 12 insertions, 0 deletions

diff --git a/src/plugins/geoservices/osm/qgeotiledmappingmanagerengineosm.cpp b/src/plugins/geoservices/osm/qgeotiledmappingmanagerengineosm.cpp
index 0e1fb356..a0fb1a59 100644
--- a/src/plugins/geoservices/osm/qgeotiledmappingmanagerengineosm.cpp
+++ b/src/plugins/geoservices/osm/qgeotiledmappingmanagerengineosm.cpp
@@ -311,6 +311,17 @@ QGeoTiledMappingManagerEngineOsm::QGeoTiledMappingManagerEngineOsm(const QVarian
     }
     setTileFetcher(tileFetcher);
 
+    /* PREFETCHING */
+    if (parameters.contains(QStringLiteral("osm.mapping.prefetching_style"))) {
+        const QString prefetchingMode = parameters.value(QStringLiteral("osm.mapping.prefetching_style")).toString();
+        if (prefetchingMode == QStringLiteral("TwoNeighbourLayers"))
+            m_prefetchStyle = QGeoTiledMap::PrefetchTwoNeighbourLayers;
+        else if (prefetchingMode == QStringLiteral("OneNeighbourLayer"))
+            m_prefetchStyle = QGeoTiledMap::PrefetchNeighbourLayer;
+        else if (prefetchingMode == QStringLiteral("NoPrefetching"))
+            m_prefetchStyle = QGeoTiledMap::NoPrefetching;
+    }
+
     *error = QGeoServiceProvider::NoError;
     errorString->clear();
 }
@@ -324,6 +335,7 @@ QGeoMap *QGeoTiledMappingManagerEngineOsm::createMap()
     QGeoTiledMap *map = new QGeoTiledMapOsm(this);
     connect(qobject_cast<QGeoFileTileCacheOsm *>(tileCache()), &QGeoFileTileCacheOsm::mapDataUpdated
             , map, &QGeoTiledMap::clearScene);
+    map->setPrefetchStyle(m_prefetchStyle);
     return map;
 }