Make QGeoRoute extensible

This change makes it possible to subclass QGeoRoute,
QGeoRouteSegment or QGeoRouteManeuver, with custom
private implementations.
It also attempts to minimize the cost that creating
a QDeclarativeGeoRoute currently has, by deferring
the initialization of QDeclarativeGeoRoute::segments_
to the first access, and also populating the list
only to the requested point.

Change-Id: I4c87391bcc380ddca6523c748ebb97d2a44ed9d2
Reviewed-by: BogDan Vatra <bogdan@kdab.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/src/location/declarativemaps/qdeclarativegeoroute_p.h b/src/location/declarativemaps/qdeclarativegeoroute_p.h
index e4501770..738d2089 100644
--- a/src/location/declarativemaps/qdeclarativegeoroute_p.h
+++ b/src/location/declarativemaps/qdeclarativegeoroute_p.h
@@ -84,6 +84,8 @@ public:
     void appendSegment(QDeclarativeGeoRouteSegment *segment);
     void clearSegments();
 
+    int segmentsCount() const;
+
 Q_SIGNALS:
     void pathChanged();
 
@@ -93,11 +95,12 @@ private:
     static QDeclarativeGeoRouteSegment *segments_at(QQmlListProperty<QDeclarativeGeoRouteSegment> *prop, int index);
     static void segments_clear(QQmlListProperty<QDeclarativeGeoRouteSegment> *prop);
 
-    void init();
+    void initSegments(unsigned int lastIndex = -1);
     QList<QGeoCoordinate> routePath();
 
     QGeoRoute route_;
     QList<QDeclarativeGeoRouteSegment *> segments_;
+    bool segmentsDirty_;
     friend class QDeclarativeRouteMapItem;
 };