Scenario: Allow to move on board with mouse left click.

src/View/Scenarios/GraphWidget.py

@@ -313,6 +313,16 @@ class GraphWidget(QGraphicsView):
     def wheelEvent(self, event):
         self.scaleView(math.pow(2.0, -event.angleDelta().y() / 240.0))
 
+    def keyPressEvent(self, event):
+        key = event.key()
+
+        if key == Qt.Key_Plus:
+            self.scaleView(1.2)
+        elif key == Qt.Key_Minus:
+            self.scaleView(1 / 1.2)
+        else:
+            super(GraphWidget, self).keyPressEvent(event)
+
     def scaleView(self, scaleFactor):
         factor = self.transform().scale(
             scaleFactor, scaleFactor
@@ -323,6 +333,43 @@ class GraphWidget(QGraphicsView):
 
         self.scale(scaleFactor, scaleFactor)
 
+    def mousePressEvent(self, event):
+        # pos = self.mapToScene(event.pos())
+        # items = self.items(event.pos())
+
+        self.update()
+        super(GraphWidget, self).mousePressEvent(event)
+
+    def mouseMoveEvent(self, event):
+        pos = self.mapToScene(event.pos())
+
+        items = self.items(event.pos())
+        selectable_items = list(
+            filter(
+                lambda i: (type(i) is ScenarioItem
+                           or type(i) is EdgeItem),
+                items
+            )
+        )
+
+        # Move on scene
+        if len(selectable_items) == 0:
+            if event.buttons() & Qt.LeftButton:
+                old_p = self.mapToScene(
+                    int(self.m_origin_x), int(self.m_origin_y)
+                )
+                new_p = self.mapToScene(event.pos())
+                translation = new_p - old_p
+
+                self.translate(translation.x(), translation.y())
+
+                self.m_origin_x = event.x()
+                self.m_origin_y = event.y()
+
+        # Propagate event
+        self.update()
+        super(GraphWidget, self).mouseMoveEvent(event)
+
     # Contextual menu
 
     def contextMenuEvent(self, event):