began new infrastructure

Yep, this is another one of my "famous" sweeping rewrites. Expect things to break.

Goals for this are:
- Greatly simplify node connections (particularly with arrays) so the code requires less maintenance/is more stable
- Redesign node structure to address issues where UI would stall for lengthy periods of time
- Less reliance on shared ptrs/greater reliance on QObject system for inheritance/memory management
- General code cleanup and improvements

app/widget/nodeview/nodeview.h

@@ -22,172 +22,47 @@
 #define NODEVIEW_H
 
 #include <QGraphicsView>
-#include <QTimer>
 
 #include "node/graph.h"
 #include "node/nodecopypaste.h"
-#include "nodeviewscene.h"
 #include "widget/handmovableview/handmovableview.h"
 
 namespace olive {
 
-/**
- * @brief A widget for viewing and editing node graphs
- *
- * This widget takes a NodeGraph object and constructs a QGraphicsScene representing its data, viewing and allowing
- * the user to make modifications to it.
- */
 class NodeView : public HandMovableView, public NodeCopyPasteService
 {
   Q_OBJECT
 public:
   NodeView(QWidget* parent);
 
-  virtual ~NodeView() override;
-
   /**
    * @brief Sets the graph to view
    */
-  void SetGraph(NodeGraph* graph);
+  void SetGraph(NodeGraph* graph){}
 
   /**
    * @brief Delete selected nodes from graph (user-friendly/undoable)
    */
-  void DeleteSelected();
+  void DeleteSelected(){}
 
-  void SelectAll();
-  void DeselectAll();
+  void SelectAll(){}
+  void DeselectAll(){}
 
-  void Select(const QVector<Node*>& nodes);
-  void SelectWithDependencies(QVector<Node *> nodes);
+  void Select(const QVector<Node*>& nodes){}
+  void SelectWithDependencies(QVector<Node *> nodes){}
 
-  void CopySelected(bool cut);
-  void Paste();
+  void CopySelected(bool cut){}
+  void Paste(){}
 
-  void Duplicate();
+  void Duplicate(){}
 
-  void SelectBlocks(const QVector<Block*>& blocks);
+  void SelectBlocks(const QVector<Block*>& blocks){}
 
-  void DeselectBlocks(const QVector<Block*>& blocks);
-
-signals:
-  void NodesSelected(const QVector<Node*>& nodes);
-
-  void NodesDeselected(const QVector<Node*>& nodes);
-
-protected:
-  virtual void keyPressEvent(QKeyEvent *event) override;
-
-  virtual void mousePressEvent(QMouseEvent *event) override;
-  virtual void mouseMoveEvent(QMouseEvent *event) override;
-  virtual void mouseReleaseEvent(QMouseEvent* event) override;
-
-  virtual void wheelEvent(QWheelEvent* event) override;
+  void DeselectBlocks(const QVector<Block*>& blocks){}
 
 private:
-  void AttachNodesToCursor(const QVector<Node *> &nodes);
-
-  void AttachItemsToCursor(const QVector<NodeViewItem *> &items);
-
-  void DetachItemsFromCursor();
-
-  void SetFlowDirection(NodeViewCommon::FlowDirection dir);
-
-  void MoveAttachedNodesToCursor(const QPoint &p);
-
-  void ConnectSelectionChangedSignal();
-  void DisconnectSelectionChangedSignal();
-
-  void UpdateBlockFilter();
-
-  void AssociateNodeWithSelectedBlocks(Node* n);
-  void DisassociateNode(Node* n, bool remove_from_map);
-
-  void QueueSelectBlocksInternal();
-
-  QTimer select_blocks_internal_timer_;
-
   NodeGraph* graph_;
 
-  struct AttachedItem {
-    NodeViewItem* item;
-    QPointF original_pos;
-  };
-
-  QList<AttachedItem> attached_items_;
-
-  NodeViewEdge* drop_edge_;
-  NodeInput* drop_input_;
-
-  NodeViewScene scene_;
-
-  QVector<Node*> selected_nodes_;
-
-  QVector<Block*> selected_blocks_;
-
-  QHash<Node*, QVector<Block*> > association_map_;
-
-  QHash<Block*, QVector<Node*> > temporary_association_map_;
-
-  enum FilterMode {
-    kFilterShowAll,
-    kFilterShowSelectedBlocks
-  };
-
-  FilterMode filter_mode_;
-
-  double scale_;
-
-private slots:
-  void ValidateFilter();
-
-  void AssociatedNodeDestroyed();
-
-  void GraphNodeRemoved(Node* node);
-
-  void GraphEdgeAdded(NodeEdgePtr edge);
-
-  void GraphEdgeRemoved(NodeEdgePtr edge);
-
-  /**
-   * @brief Internal function triggered when any change is signalled from the QGraphicsScene
-   *
-   * Current primary function is to inform all NodeViewEdges to re-adjust in case any Nodes have moved
-   */
-  void ItemsChanged();
-
-  /**
-   * @brief Receiver for when the scene's selected items change
-   */
-  void SceneSelectionChangedSlot();
-
-  /**
-   * @brief Receiver for when the user right clicks (or otherwise requests a context menu)
-   */
-  void ShowContextMenu(const QPoint &pos);
-
-  /**
-   * @brief Receiver for when the user requests a new node from the add menu
-   */
-  void CreateNodeSlot(QAction* action);
-
-  /**
-   * @brief Receiver for setting the direction from the context menu
-   */
-  void ContextMenuSetDirection(QAction* action);
-
-  /**
-   * @brief Receiver for auto-position descendents menu action
-   */
-  void AutoPositionDescendents();
-
-  /**
-   * @brief Receiver for the user changing the filter
-   */
-  void ContextMenuFilterChanged(QAction* action);
-
-  void SelectBlocksInternal();
-
 };
 
 }