nodeview: disable toolbar when null graph set

app/panel/node/node.cpp

@@ -32,19 +32,19 @@ NodePanel::NodePanel(QWidget *parent) :
   QVBoxLayout *outer_layout = new QVBoxLayout(outer_widget);
   outer_layout->setMargin(0);
 
-  NodeViewToolBar *toolbar = new NodeViewToolBar();
-  outer_layout->addWidget(toolbar);
+  toolbar_ = new NodeViewToolBar();
+  outer_layout->addWidget(toolbar_);
 
   // Create NodeView widget
   node_view_ = new NodeView(this);
   outer_layout->addWidget(node_view_);
 
   // Connect toolbar to NodeView
-  connect(toolbar, &NodeViewToolBar::MiniMapEnabledToggled, node_view_, &NodeView::SetMiniMapEnabled);
-  connect(toolbar, &NodeViewToolBar::AddNodeClicked, node_view_, &NodeView::ShowAddMenu);
+  connect(toolbar_, &NodeViewToolBar::MiniMapEnabledToggled, node_view_, &NodeView::SetMiniMapEnabled);
+  connect(toolbar_, &NodeViewToolBar::AddNodeClicked, node_view_, &NodeView::ShowAddMenu);
 
   // Set defaults
-  toolbar->SetMiniMapEnabled(true);
+  toolbar_->SetMiniMapEnabled(true);
   node_view_->SetMiniMapEnabled(true);
 
   // Connect node view signals to this panel

app/panel/node/node.h

@@ -44,6 +44,7 @@ public:
   void SetGraph(NodeGraph *graph, const QVector<Node*> &nodes)
   {
     node_view_->SetGraph(graph, nodes);
+    toolbar_->setEnabled(graph);
   }
 
   void ClearGraph()
@@ -125,6 +126,8 @@ private:
 
   NodeView* node_view_;
 
+  NodeViewToolBar *toolbar_;
+
 };
 
 }

app/widget/nodeview/nodeview.cpp

@@ -975,6 +975,10 @@ void NodeView::ShowContextMenu(const QPoint &pos)
 
 void NodeView::CreateNodeSlot(QAction *action)
 {
+  if (!graph_) {
+    return;
+  }
+
   Node* new_node = NodeFactory::CreateFromMenuAction(action);
 
   if (new_node) {