Introduce Map.visibleArea

This will allow moving the visible map area to a subregion
of the viewport, allowing to maintain the desired visible
region visible when overlaying controls on top of the map.

Task-number: QTBUG-68966
Change-Id: Idf4b30f7c1e4062e5e1c0ddc01a31bc856c0bc0c
Reviewed-by: Alex Blasche <alexander.blasche@qt.io>

1 files changed, 27 insertions, 1 deletions

diff --git a/src/location/maps/qgeotiledmap.cpp b/src/location/maps/qgeotiledmap.cpp
index a1231cf4..74346fdb 100644
--- a/src/location/maps/qgeotiledmap.cpp
+++ b/src/location/maps/qgeotiledmap.cpp
@@ -149,7 +149,8 @@ QGeoMap::Capabilities QGeoTiledMap::capabilities() const
 {
     return Capabilities(SupportsVisibleRegion
                         | SupportsSetBearing
-                        | SupportsAnchoringCoordinate);
+                        | SupportsAnchoringCoordinate
+                        | SupportsVisibleArea);
 }
 
 void QGeoTiledMap::setCopyrightVisible(bool visible)
@@ -353,6 +354,31 @@ void QGeoTiledMapPrivate::updateScene()
         emit q->sgNodeChanged();
 }
 
+void QGeoTiledMapPrivate::setVisibleArea(const QRectF &visibleArea)
+{
+    Q_Q(QGeoTiledMap);
+    const QRectF va = clampVisibleArea(visibleArea);
+    if (va == m_visibleArea)
+        return;
+
+    m_visibleArea = va;
+    m_geoProjection->setVisibleArea(va);
+
+    m_visibleTiles->setVisibleArea(va);
+    m_prefetchTiles->setVisibleArea(va);
+    m_mapScene->setVisibleArea(va);
+
+     if (m_copyrightVisible)
+        q->evaluateCopyrights(m_mapScene->visibleTiles());
+    updateScene();
+    q->sgNodeChanged();
+}
+
+QRectF QGeoTiledMapPrivate::visibleArea() const
+{
+    return m_visibleArea;
+}
+
 void QGeoTiledMapPrivate::changeActiveMapType(const QGeoMapType mapType)
 {
     m_visibleTiles->setTileSize(m_cameraCapabilities.tileSize());