began node viewer for dag insight

app/widget/nodeview/nodeview.cpp

@@ -20,22 +20,81 @@
 
 #include "nodeview.h"
 
-#include <QGraphicsRectItem>
-
-#include "nodeviewitem.h"
-
 NodeView::NodeView(QWidget *parent) :
   QGraphicsView(parent),
   graph_(nullptr)
 {
   setScene(&scene_);
 
-  NodeViewItem* item = new NodeViewItem();
-
-  scene_.addItem(item);
+  connect(&scene_, SIGNAL(changed(const QList<QRectF>&)), this, SLOT(ItemsChanged()));
 }
 
 void NodeView::SetGraph(NodeGraph *graph)
 {
+  // Clear the scene of all UI objects
+  scene_.clear();
+  edges_.clear();
+
+  // Set reference to the graph
   graph_ = graph;
+
+  // If the graph is valid, add UI objects for each of its Nodes
+  if (graph_ != nullptr) {
+    QList<Node*> graph_nodes = graph_->nodes();
+
+    foreach (Node* node, graph_nodes) {
+      NodeViewItem* item = new NodeViewItem();
+
+      item->SetNode(node);
+
+      scene_.addItem(item);
+
+      // Add a NodeViewEdge for each connection
+      QList<NodeParam*> node_params = node->parameters();
+
+      foreach (NodeParam* param, node_params) {
+
+        // We only bother working with outputs since eventually this will cover all inputs too
+        // (covering both would lead to duplicates since every edge connects to one input and one output)
+        if (param->type() == NodeParam::kOutput) {
+          const QVector<NodeEdgePtr>& edges = param->edges();
+
+          foreach(NodeEdgePtr edge, edges) {
+            NodeViewEdge* edge_ui = new NodeViewEdge();
+
+            edge_ui->SetEdge(edge);
+
+            scene_.addItem(edge_ui);
+
+            // Keep track of edge widgets so they can be quickly updated whenever nodes move
+            edges_.append(edge_ui);
+          }
+        }
+      }
+    }
+  }
+}
+
+NodeViewItem *NodeView::NodeToUIObject(QGraphicsScene *scene, Node *n)
+{
+  QList<QGraphicsItem*> graphics_items = scene->items();
+
+  for (int i=0;i<graphics_items.size();i++) {
+    NodeViewItem* item = dynamic_cast<NodeViewItem*>(graphics_items.at(i));
+
+    if (item != nullptr) {
+      if (item->node() == n) {
+        return item;
+      }
+    }
+  }
+
+  return nullptr;
+}
+
+void NodeView::ItemsChanged()
+{
+  foreach (NodeViewEdge* edge, edges_) {
+    edge->Adjust();
+  }
 }