model: Add river network to study.

src/view/MainWindow.py

@@ -274,7 +274,7 @@ class ApplicationWindow(QMainWindow, ListedSubWindow):
             Nothing
         """
         if not self.model is None:
-            self.network = NetworkWindow(parent=self)
+            self.network = NetworkWindow(model=self.model, parent=self)
             self.network.show()
 
     # TODO: Delete me !

src/view/NetworkWindow.py

@@ -21,11 +21,16 @@ from PyQt5.QtWidgets import (
 )
 
 class NetworkWindow(ASubWindow):
-    def __init__(self, title="Network", parent=None):
+    def __init__(self, model=None, title="River network", parent=None):
         super(NetworkWindow, self).__init__(name=title, ui="Network", parent=parent)
         self.ui.setWindowTitle(title)
 
-        self.graph = Graph()
+        self.model = model
+        if not self.model.data["graph"]:
+            self.graph = Graph()
+            self.model.data["graph"] = self.graph
+        else:
+            self.graph = self.model.data["graph"]
 
         # Graph Widget