Adding map context to simplify parameter passing

scwx-qt/source/scwx/qt/map/generic_layer.cpp

@@ -10,14 +10,27 @@ namespace map
 class GenericLayerImpl
 {
 public:
-   explicit GenericLayerImpl() {}
+   explicit GenericLayerImpl(std::shared_ptr<MapContext> context) :
+       context_ {context}
+   {
+   }
 
    ~GenericLayerImpl() {}
+
+   std::shared_ptr<MapContext> context_;
 };
 
-GenericLayer::GenericLayer() : p(std::make_unique<GenericLayerImpl>()) {}
+GenericLayer::GenericLayer(std::shared_ptr<MapContext> context) :
+    p(std::make_unique<GenericLayerImpl>(context))
+{
+}
 GenericLayer::~GenericLayer() = default;
 
+std::shared_ptr<MapContext> GenericLayer::context() const
+{
+   return p->context_;
+}
+
 } // namespace map
 } // namespace qt
 } // namespace scwx