improved connector UI in node view

app/node/output/track/track.cpp

@@ -41,7 +41,8 @@ const QString Track::kMutedInput = QStringLiteral("muted_in");
 Track::Track() :
   track_type_(Track::kNone),
   index_(-1),
-  locked_(false)
+  locked_(false),
+  sequence_(nullptr)
 {
   AddInput(kBlockInput, NodeValue::kNone, InputFlags(kInputFlagArray | kInputFlagNotKeyframable));
 

app/node/output/track/track.h

@@ -26,6 +26,8 @@
 
 namespace olive {
 
+class Sequence;
+
 /**
  * @brief A time traversal Node for sorting through one channel/track of Blocks
  */
@@ -388,9 +390,18 @@ public:
 
   bool IsLocked() const;
 
-
   int GetArrayIndexFromBlock(Block* block) const;
 
+  Sequence *sequence() const
+  {
+    return sequence_;
+  }
+
+  void set_sequence(Sequence *sequence)
+  {
+    sequence_ = sequence;
+  }
+
   static const double kTrackHeightDefault;
   static const double kTrackHeightMinimum;
   static const double kTrackHeightInterval;
@@ -472,6 +483,8 @@ private:
 
   bool locked_;
 
+  Sequence *sequence_;
+
 private slots:
   void BlockLengthChanged();
 

app/node/output/track/tracklist.cpp

@@ -83,6 +83,7 @@ void TrackList::TrackConnected(Node *node, int element)
   connect(track, &Track::TrackLengthChanged, this, &TrackList::UpdateTotalLength);
 
   track->set_type(type_);
+  track->set_sequence(parent());
 
   emit TrackListChanged();
 
@@ -121,6 +122,7 @@ void TrackList::TrackDisconnected(Node *node, int element)
 
   track->SetIndex(-1);
   track->set_type(Track::kNone);
+  track->set_sequence(nullptr);
 
   disconnect(track, &Track::TrackLengthChanged, this, &TrackList::UpdateTotalLength);
 

app/widget/nodeview/CMakeLists.txt

@@ -25,6 +25,8 @@ set(OLIVE_SOURCES
   widget/nodeview/nodeviewedge.h
   widget/nodeview/nodeviewitem.cpp
   widget/nodeview/nodeviewitem.h
+  widget/nodeview/nodeviewitemconnector.cpp
+  widget/nodeview/nodeviewitemconnector.h
   widget/nodeview/nodeviewminimap.cpp
   widget/nodeview/nodeviewminimap.h
   widget/nodeview/nodeviewscene.cpp

app/widget/nodeview/nodeview.cpp

@@ -847,7 +847,7 @@ void NodeView::UpdateSelectionCache()
 
 void NodeView::ShowContextMenu(const QPoint &pos)
 {
-  if (!graph_) {
+  if (filter_nodes_.isEmpty()) {
     return;
   }
 
@@ -1023,7 +1023,6 @@ void NodeView::RemoveNode(Node *node)
     scene_.RemoveEdge(it->second, it->first);
   }
   positions_.remove(scene_.item_map().value(node));
-  scene_.RemoveNode(node);
 }
 
 void NodeView::AddEdge(Node *output, const NodeInput &input)
@@ -1645,8 +1644,6 @@ NodeViewItem *NodeView::UpdateNodeItem(Node *node, bool ignore_own_context)
   // Get UI item or create if it doesn't exist
   NodeViewItem *item = scene_.item_map().value(node);
   if (!item) {
-    item = scene_.AddNode(node);
-
     for (auto it=node->input_connections().cbegin(); it!=node->input_connections().cend(); it++) {
       if (scene_.item_map().contains(it->second)) {
         scene_.AddEdge(it->second, it->first);

app/widget/nodeview/nodeviewcontext.cpp

@@ -6,8 +6,11 @@
 #include <QPen>
 #include <QStyleOptionGraphicsItem>
 
+#include "core.h"
 #include "node/block/block.h"
+#include "node/graph.h"
 #include "node/output/track/track.h"
+#include "node/project/sequence/sequence.h"
 #include "nodeviewitem.h"
 #include "ui/colorcoding.h"
 
@@ -31,11 +34,12 @@ void NodeViewContext::SetContext(Node *node)
 
   if (context_) {
     if (Block *block = dynamic_cast<Block*>(node)) {
+      rational timebase = block->track()->sequence()->GetVideoParams().frame_rate_as_time_base();
       lbl_ = QCoreApplication::translate("NodeViewContext",
                                          "%1 [%2] :: %3 - %4").arg(block->GetLabelAndName(),
                                                                    Track::Reference::TypeToTranslatedString(block->track()->type()),
-                                                                     block->in().toString(),
-                                                                     block->out().toString());
+                                                                   Timecode::time_to_timecode(block->in(), timebase, Core::instance()->GetTimecodeDisplay()),
+                                                                   Timecode::time_to_timecode(block->out(), timebase, Core::instance()->GetTimecodeDisplay()));
     } else {
       lbl_ = node->GetLabelAndName();
     }
@@ -52,8 +56,38 @@ void NodeViewContext::SetContext(Node *node)
 
 void NodeViewContext::AddChild(Node *node)
 {
+  if (!context_) {
+    return;
+  }
+
   NodeViewItem *item = new NodeViewItem(this);
   item->SetNode(node);
+  item->SetNodePosition(context_->parent()->GetNodesForContext(context_).value(node));
+  item->SetFlowDirection(flow_dir_);
+
+  if (node == context_) {
+    item->SetLabelAsOutput(true);
+  }
+
+  for (auto it=node->output_connections().cbegin(); it!=node->output_connections().cend(); it++) {
+    foreach (auto child, childItems()) {
+      if (NodeViewItem *other_item = dynamic_cast<NodeViewItem*>(child)) {
+        if (other_item->GetNode() == it->second.node()) {
+          AddEdgeInternal(node, it->second, item, other_item);
+        }
+      }
+    }
+  }
+
+  for (auto it=node->input_connections().cbegin(); it!=node->input_connections().cend(); it++) {
+    foreach (auto child, childItems()) {
+      if (NodeViewItem *other_item = dynamic_cast<NodeViewItem*>(child)) {
+        if (it->second == other_item->GetNode()) {
+          AddEdgeInternal(it->second, it->first, other_item, item);
+        }
+      }
+    }
+  }
 }
 
 qreal GetTextOffset(const QFontMetricsF &fm)
@@ -75,12 +109,31 @@ void NodeViewContext::UpdateRect()
 
 void NodeViewContext::SetFlowDirection(NodeViewCommon::FlowDirection dir)
 {
-  auto children = childItems();
-  foreach (auto child, children) {
+  flow_dir_ = dir;
+
+  foreach (auto child, childItems()) {
     if (NodeViewItem *item = dynamic_cast<NodeViewItem*>(child)) {
       item->SetFlowDirection(dir);
     }
   }
+
+  foreach (auto child, childItems()) {
+    if (NodeViewEdge *edge = dynamic_cast<NodeViewEdge*>(child)) {
+      edge->SetFlowDirection(dir);
+    }
+  }
+}
+
+void NodeViewContext::SetCurvedEdges(bool e)
+{
+  curved_edges_ = e;
+
+  const QList<QGraphicsItem*> &children = childItems();
+  foreach (auto child, children) {
+    if (NodeViewEdge *edge = dynamic_cast<NodeViewEdge*>(child)) {
+      edge->SetCurved(e);
+    }
+  }
 }
 
 void NodeViewContext::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
@@ -97,7 +150,7 @@ void NodeViewContext::paint(QPainter *painter, const QStyleOptionGraphicsItem *o
   int rounded = painter->fontMetrics().height();
   painter->drawRoundedRect(rect(), rounded, rounded);
 
-  painter->setPen(context_ ? ColorCoding::GetUISelectorColor(context_->color()) : Qt::white);
+  painter->setPen(widget->palette().text().color());
 
   int offset = GetTextOffset(painter->fontMetrics());
 
@@ -111,4 +164,17 @@ QVariant NodeViewContext::itemChange(GraphicsItemChange change, const QVariant &
   return super::itemChange(change, value);
 }
 
+NodeViewEdge* NodeViewContext::AddEdgeInternal(Node *output, const NodeInput& input, NodeViewItem *from, NodeViewItem *to)
+{
+  NodeViewEdge* edge_ui = new NodeViewEdge(output, input, from, to, this);
+
+  edge_ui->SetFlowDirection(flow_dir_);
+  edge_ui->SetCurved(curved_edges_);
+
+  from->AddEdge(edge_ui);
+  to->AddEdge(edge_ui);
+
+  return edge_ui;
+}
+
 }

app/widget/nodeview/nodeviewcontext.h

@@ -6,6 +6,7 @@
 
 #include "node/node.h"
 #include "nodeviewcommon.h"
+#include "nodeviewedge.h"
 
 namespace olive {
 
@@ -22,16 +23,24 @@ public:
 
   void SetFlowDirection(NodeViewCommon::FlowDirection dir);
 
+  void SetCurvedEdges(bool e);
+
   virtual void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = nullptr) override;
 
 protected:
   virtual QVariant itemChange(QGraphicsItem::GraphicsItemChange change, const QVariant &value) override;
 
 private:
+  NodeViewEdge *AddEdgeInternal(Node *output, const NodeInput& input, NodeViewItem *from, NodeViewItem *to);
+
   Node *context_;
 
   QString lbl_;
 
+  NodeViewCommon::FlowDirection flow_dir_;
+
+  bool curved_edges_;
+
 };
 
 }

app/widget/nodeview/nodeviewedge.cpp

@@ -128,10 +128,12 @@ void NodeViewEdge::paint(QPainter *painter, const QStyleOptionGraphicsItem *opti
   painter->drawPath(path());
 
   // Draw arrow
+  if (!connected_) {
     painter->setPen(Qt::NoPen);
     painter->setBrush(edge_color);
     painter->drawPolygon(arrow_);
   }
+}
 
 void NodeViewEdge::Init()
 {

app/widget/nodeview/nodeviewitem.cpp

@@ -46,7 +46,8 @@ NodeViewItem::NodeViewItem(QGraphicsItem *parent) :
   hide_titlebar_(false),
   highlighted_index_(-1),
   flow_dir_(NodeViewCommon::kLeftToRight),
-  prevent_removing_(false)
+  prevent_removing_(false),
+  label_as_output_(false)
 {
   // Set flags for this widget
   setFlag(QGraphicsItem::ItemIsMovable);
@@ -66,7 +67,8 @@ NodeViewItem::NodeViewItem(QGraphicsItem *parent) :
   title_bar_rect_ = QRectF(-widget_width/2, -widget_height/2, widget_width, widget_height);
   setRect(title_bar_rect_);
 
-  output_triangle_.resize(3);
+  input_connector_ = new NodeViewItemConnector(this);
+  output_connector_ = new NodeViewItemConnector(this);
 }
 
 QPointF NodeViewItem::GetNodePosition() const
@@ -208,6 +210,11 @@ int NodeViewItem::GetIndexAt(QPointF pt) const
 
 void NodeViewItem::SetNode(Node *n)
 {
+  if (node_) {
+    disconnect(n, &Node::LabelChanged, this, &NodeViewItem::NodeAppearanceChanged);
+    disconnect(n, &Node::ColorChanged, this, &NodeViewItem::NodeAppearanceChanged);
+  }
+
   node_ = n;
 
   node_inputs_.clear();
@@ -220,6 +227,11 @@ void NodeViewItem::SetNode(Node *n)
         node_inputs_.append(input);
       }
     }
+
+    input_connector_->setVisible(!node_inputs_.isEmpty());
+
+    connect(n, &Node::LabelChanged, this, &NodeViewItem::NodeAppearanceChanged);
+    connect(n, &Node::ColorChanged, this, &NodeViewItem::NodeAppearanceChanged);
   }
 
   update();
@@ -234,6 +246,7 @@ void NodeViewItem::SetExpanded(bool e, bool hide_titlebar)
 
   expanded_ = e;
   hide_titlebar_ = hide_titlebar;
+  input_connector_->setVisible(!expanded_);
 
   if (expanded_ && !node_inputs_.isEmpty()) {
     // Create new rect
@@ -252,7 +265,11 @@ void NodeViewItem::SetExpanded(bool e, bool hide_titlebar)
 
   update();
 
+  UpdateConnectorPositions();
+
   ReadjustAllEdges();
+
+  UpdateContextRect();
 }
 
 void NodeViewItem::ToggleExpanded()
@@ -298,8 +315,14 @@ void NodeViewItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *opti
 
     painter->setPen(app_pal.color(QPalette::Text));
 
-    QString node_label = node_->GetLabel();
-    QString node_shortname = node_->ShortName();
+    QString node_label, node_shortname;
+
+    if (label_as_output_) {
+      node_shortname = QCoreApplication::translate("NodeViewItem", "Output");
+    } else {
+      node_label = node_->GetLabel();
+      node_shortname = node_->ShortName();
+    }
 
     int icon_size = painter->fontMetrics().height()/2;
 
@@ -335,41 +358,6 @@ void NodeViewItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *opti
   painter->setBrush(Qt::NoBrush);
 
   painter->drawRect(rect());
-
-  // Draw output triangle
-  painter->setPen(Qt::NoPen);
-  painter->setBrush(app_pal.color(QPalette::Text));
-  int triangle_sz = title_bar_rect_.height() / 2;
-  int triangle_sz_half = triangle_sz / 2;
-
-  switch (flow_dir_) {
-  case NodeViewCommon::kLeftToRight:
-    // Triangle pointing right
-    output_triangle_[0] = QPointF(rect().right(), rect().center().y() - triangle_sz_half);
-    output_triangle_[1] = QPointF(rect().right() + triangle_sz_half, rect().center().y());
-    output_triangle_[2] = QPointF(rect().right(), rect().center().y() + triangle_sz_half);
-    break;
-  case NodeViewCommon::kTopToBottom:
-    // Triangle pointing down
-    output_triangle_[0] = QPointF(rect().center().x() - triangle_sz_half, rect().bottom());
-    output_triangle_[1] = QPointF(rect().center().x(), rect().bottom() + triangle_sz_half);
-    output_triangle_[2] = QPointF(rect().center().x() + triangle_sz_half, rect().bottom());
-    break;
-  case NodeViewCommon::kBottomToTop:
-    // Triangle pointing up
-    output_triangle_[0] = QPointF(rect().center().x() - triangle_sz_half, rect().top());
-    output_triangle_[1] = QPointF(rect().center().x(), rect().top() - triangle_sz_half);
-    output_triangle_[2] = QPointF(rect().center().x() + triangle_sz_half, rect().top());
-    break;
-  case NodeViewCommon::kRightToLeft:
-    // Triangle pointing left
-    output_triangle_[0] = QPointF(rect().left(), rect().center().y() - triangle_sz_half);
-    output_triangle_[1] = QPointF(rect().left() - triangle_sz_half, rect().center().y());
-    output_triangle_[2] = QPointF(rect().left(), rect().center().y() + triangle_sz_half);
-    break;
-  }
-
-  painter->drawPolygon(output_triangle_);
 }
 
 void NodeViewItem::mousePressEvent(QGraphicsSceneMouseEvent *event)
@@ -407,9 +395,7 @@ QVariant NodeViewItem::itemChange(QGraphicsItem::GraphicsItemChange change, cons
   if (change == ItemPositionHasChanged && node_) {
     ReadjustAllEdges();
 
-    if (NodeViewContext *ctx = dynamic_cast<NodeViewContext*>(parentItem())) {
-      ctx->UpdateRect();
-    }
+    UpdateContextRect();
   }
 
   return QGraphicsItem::itemChange(change, value);
@@ -422,6 +408,13 @@ void NodeViewItem::ReadjustAllEdges()
   }
 }
 
+void NodeViewItem::UpdateContextRect()
+{
+  if (NodeViewContext *ctx = dynamic_cast<NodeViewContext*>(parentItem())) {
+    ctx->UpdateRect();
+  }
+}
+
 void NodeViewItem::DrawNodeTitle(QPainter* painter, QString text, const QRectF& rect, Qt::Alignment vertical_align, int icon_size, bool draw_arrow)
 {
   QFontMetrics fm = painter->fontMetrics();
@@ -487,6 +480,13 @@ void NodeViewItem::SetHighlightedIndex(int index)
   update();
 }
 
+void NodeViewItem::SetLabelAsOutput(bool e)
+{
+  label_as_output_ = e;
+  output_connector_->setVisible(!e);
+  update();
+}
+
 QRectF NodeViewItem::GetInputRect(int index) const
 {
   QRectF r = title_bar_rect_;
@@ -504,28 +504,45 @@ QRectF NodeViewItem::GetInputRect(int index) const
 
 QPointF NodeViewItem::GetInputPoint(const QString &input, int element, const QPointF& source_pos) const
 {
+  if (expanded_) {
     return pos() + GetInputPointInternal(node_inputs_.indexOf(input), source_pos);
+  } else {
+    return pos() + input_connector_->pos();
+  }
 }
 
 QPointF NodeViewItem::GetOutputPoint() const
 {
+  QPointF p = pos() + output_connector_->pos();
+  QRectF r = output_connector_->boundingRect();
+
   switch (flow_dir_) {
   case NodeViewCommon::kLeftToRight:
   default:
-    return pos() + QPointF(rect().right(), rect().center().y());
+    p.setX(p.x() + r.width());
+    break;
   case NodeViewCommon::kRightToLeft:
-    return pos() + QPointF(rect().left(), rect().center().y());
+    p.setX(p.x() - r.width());
+    break;
   case NodeViewCommon::kTopToBottom:
-    return pos() + QPointF(rect().center().x(), rect().bottom());
+    p.setY(p.y() + r.height());
+    break;
   case NodeViewCommon::kBottomToTop:
-    return pos() + QPointF(rect().center().x(), rect().top());
+    p.setY(p.y() - r.height());
+    break;
   }
+
+  return p;
 }
 
 void NodeViewItem::SetFlowDirection(NodeViewCommon::FlowDirection dir)
 {
   flow_dir_ = dir;
 
+  input_connector_->SetFlowDirection(dir);
+  output_connector_->SetFlowDirection(dir);
+
+  UpdateConnectorPositions();
   UpdateNodePosition();
 }
 
@@ -556,4 +573,33 @@ void NodeViewItem::UpdateNodePosition()
   setPos(NodeToScreenPoint(cached_node_pos_, flow_dir_));
 }
 
+void NodeViewItem::UpdateConnectorPositions()
+{
+  QRectF output_rect = output_connector_->boundingRect();
+
+  switch (flow_dir_) {
+  case NodeViewCommon::kLeftToRight:
+    input_connector_->setPos(rect().left() - output_rect.width(), rect().center().y());
+    output_connector_->setPos(rect().right(), rect().center().y());
+    break;
+  case NodeViewCommon::kRightToLeft:
+    input_connector_->setPos(rect().right() + output_rect.width(), rect().center().y());
+    output_connector_->setPos(rect().left(), rect().center().y());
+    break;
+  case NodeViewCommon::kTopToBottom:
+    input_connector_->setPos(rect().center().x(), rect().top() - output_rect.height());
+    output_connector_->setPos(rect().center().x(), rect().bottom());
+    break;
+  case NodeViewCommon::kBottomToTop:
+    input_connector_->setPos(rect().center().x(), rect().bottom() + output_rect.height());
+    output_connector_->setPos(rect().center().x(), rect().top());
+    break;
+  }
+}
+
+void NodeViewItem::NodeAppearanceChanged()
+{
+  update();
+}
+
 }

app/widget/nodeview/nodeviewitem.h

@@ -28,6 +28,7 @@
 
 #include "node/node.h"
 #include "nodeviewcommon.h"
+#include "nodeviewitemconnector.h"
 
 namespace olive {
 
@@ -40,8 +41,9 @@ class NodeViewEdge;
  *
  * To retrieve the NodeViewItem for a certain Node, use NodeView::NodeToUIObject().
  */
-class NodeViewItem : public QGraphicsRectItem
+class NodeViewItem : public QObject, public QGraphicsRectItem
 {
+  Q_OBJECT
 public:
   NodeViewItem(QGraphicsItem* parent = nullptr);
 
@@ -125,11 +127,13 @@ public:
     return prevent_removing_;
   }
 
-  const QPolygonF &GetOutputTriangle() const
+  QPolygonF GetOutputTriangle() const
   {
-    return output_triangle_;
+    return output_connector_->polygon();
   }
 
+  void SetLabelAsOutput(bool e);
+
 protected:
   virtual void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = nullptr) override;
 
@@ -143,6 +147,8 @@ protected:
 private:
   void ReadjustAllEdges();
 
+  void UpdateContextRect();
+
   void DrawNodeTitle(QPainter *painter, QString text, const QRectF &rect, Qt::Alignment vertical_align, int icon_size, bool draw_arrow);
 
   /**
@@ -160,6 +166,8 @@ private:
    */
   void UpdateNodePosition();
 
+  void UpdateConnectorPositions();
+
   /**
    * @brief Reference to attached Node
    */
@@ -195,7 +203,13 @@ private:
 
   bool prevent_removing_;
 
-  QPolygonF output_triangle_;
+  NodeViewItemConnector *input_connector_;
+  NodeViewItemConnector *output_connector_;
+
+  bool label_as_output_;
+
+private slots:
+  void NodeAppearanceChanged();
 
 };
 

app/widget/nodeview/nodeviewitemconnector.cpp

@@ -0,0 +1,81 @@
+/***
+
+  Olive - Non-Linear Video Editor
+  Copyright (C) 2021 Olive Team
+
+  This program is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+***/
+
+#include "nodeviewitemconnector.h"
+
+#include <QApplication>
+#include <QFontMetrics>
+#include <QPalette>
+#include <QPen>
+
+#include "nodeviewitem.h"
+
+namespace olive {
+
+NodeViewItemConnector::NodeViewItemConnector(QGraphicsItem *parent) :
+  QGraphicsPolygonItem(parent)
+{
+  QColor c = qApp->palette().text().color();
+  setPen(QPen(c, NodeViewItem::DefaultItemBorder()));
+  setBrush(c);
+}
+
+void NodeViewItemConnector::SetFlowDirection(NodeViewCommon::FlowDirection dir)
+{
+  QFont f;
+  QFontMetricsF fm(f);
+
+  int triangle_sz = fm.height()/2;
+  int triangle_sz_half = triangle_sz / 2;
+
+  QPolygonF p;
+  p.resize(3);
+
+  switch (dir) {
+  case NodeViewCommon::kLeftToRight:
+    // Triangle pointing right
+    p[0] = QPointF(0, -triangle_sz_half);
+    p[1] = QPointF(triangle_sz_half, 0);
+    p[2] = QPointF(0, triangle_sz_half);
+    break;
+  case NodeViewCommon::kTopToBottom:
+    // Triangle pointing down
+    p[0] = QPointF(-triangle_sz_half, 0);
+    p[1] = QPointF(0, triangle_sz_half);
+    p[2] = QPointF(triangle_sz_half, 0);
+    break;
+  case NodeViewCommon::kBottomToTop:
+    // Triangle pointing up
+    p[0] = QPointF(-triangle_sz_half, 0);
+    p[1] = QPointF(0, -triangle_sz_half);
+    p[2] = QPointF(triangle_sz_half, 0);
+    break;
+  case NodeViewCommon::kRightToLeft:
+    // Triangle pointing left
+    p[0] = QPointF(0, -triangle_sz_half);
+    p[1] = QPointF(-triangle_sz_half, 0);
+    p[2] = QPointF(0, triangle_sz_half);
+    break;
+  }
+
+  setPolygon(p);
+}
+
+}

app/widget/nodeview/nodeviewitemconnector.h

@@ -0,0 +1,40 @@
+/***
+
+  Olive - Non-Linear Video Editor
+  Copyright (C) 2021 Olive Team
+
+  This program is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+***/
+
+#ifndef NODEVIEWITEMCONNECTOR_H
+#define NODEVIEWITEMCONNECTOR_H
+
+#include <QGraphicsPolygonItem>
+
+#include "nodeviewcommon.h"
+
+namespace olive {
+
+class NodeViewItemConnector : public QGraphicsPolygonItem
+{
+public:
+  NodeViewItemConnector(QGraphicsItem *parent = nullptr);
+
+  void SetFlowDirection(NodeViewCommon::FlowDirection dir);
+};
+
+}
+
+#endif // NODEVIEWITEMCONNECTOR_H

app/widget/nodeview/nodeviewscene.cpp

@@ -38,21 +38,15 @@ void NodeViewScene::SetFlowDirection(NodeViewCommon::FlowDirection direction)
 {
   direction_ = direction;
 
-  {
-    // Iterate over node items setting direction
-    QHash<Node*, NodeViewItem*>::const_iterator i;
-    for (i=item_map_.constBegin(); i!=item_map_.constEnd(); i++) {
-      i.value()->SetFlowDirection(direction_);
-    }
+  foreach (NodeViewContext *ctx, context_map_) {
+    ctx->SetFlowDirection(direction_);
   }
 
-  {
   // Iterate over edge items setting direction
   foreach (NodeViewEdge* edge, edges_) {
     edge->SetFlowDirection(direction_);
   }
 }
-}
 
 void NodeViewScene::clear()
 {
@@ -66,7 +60,6 @@ void NodeViewScene::clear()
   selectedItems();
 
   for (auto it=item_map_.cbegin(); it!=item_map_.cend(); it++) {
-    DisconnectNode(it.key());
     delete it.value();
   }
   item_map_.clear();
@@ -150,28 +143,6 @@ QVector<NodeViewEdge *> NodeViewScene::GetSelectedEdges() const
   return edges;
 }
 
-NodeViewItem* NodeViewScene::AddNode(Node* node)
-{
-  NodeViewItem* item = new NodeViewItem();
-
-  item->SetFlowDirection(direction_);
-  item->SetNode(node);
-
-  addItem(item);
-  item_map_.insert(node, item);
-
-  ConnectNode(node);
-
-  return item;
-}
-
-void NodeViewScene::RemoveNode(Node *node)
-{
-  DisconnectNode(node);
-
-  delete item_map_.take(node);
-}
-
 NodeViewEdge* NodeViewScene::AddEdge(Node *output, const NodeInput &input)
 {
   NodeViewEdge *edge = EdgeToUIObject(output, input);
@@ -202,6 +173,8 @@ NodeViewContext *NodeViewScene::AddContext(Node *node)
     context_item = new NodeViewContext();
     context_item->SetContext(node);
     context_item->setPos(0, 0);
+    context_item->SetFlowDirection(GetFlowDirection());
+    context_item->SetCurvedEdges(GetEdgesAreCurved());
     addItem(context_item);
 
     const NodeGraph::PositionMap &map = node->parent()->GetNodesForContext(node);
@@ -209,6 +182,8 @@ NodeViewContext *NodeViewScene::AddContext(Node *node)
       context_item->AddChild(it.key());
     }
     context_item->UpdateRect();
+
+    context_map_.insert(node, context_item);
   }
 
   return context_item;
@@ -250,18 +225,6 @@ NodeViewEdge* NodeViewScene::AddEdgeInternal(Node *output, const NodeInput& inpu
   return edge_ui;
 }
 
-void NodeViewScene::ConnectNode(Node *n)
-{
-  connect(n, &Node::LabelChanged, this, &NodeViewScene::NodeAppearanceChanged);
-  connect(n, &Node::ColorChanged, this, &NodeViewScene::NodeAppearanceChanged);
-}
-
-void NodeViewScene::DisconnectNode(Node *n)
-{
-  disconnect(n, &Node::ColorChanged, this, &NodeViewScene::NodeAppearanceChanged);
-  disconnect(n, &Node::LabelChanged, this, &NodeViewScene::NodeAppearanceChanged);
-}
-
 Qt::Orientation NodeViewScene::GetFlowOrientation() const
 {
   return NodeViewCommon::GetFlowOrientation(direction_);
@@ -283,10 +246,4 @@ void NodeViewScene::SetEdgesAreCurved(bool curved)
   }
 }
 
-void NodeViewScene::NodeAppearanceChanged()
-{
-  // Force item to update
-  item_map_.value(static_cast<Node*>(sender()))->update();
-}
-
 }

app/widget/nodeview/nodeviewscene.h

@@ -81,22 +81,6 @@ public:
   }
 
 public slots:
-  /**
-   * @brief Slot when a Node is added to a graph (SetGraph() connects this)
-   *
-   * This should NEVER be called directly, only connected to a NodeGraph. To add a Node to the NodeGraph
-   * use NodeGraph::AddNode().
-   */
-  NodeViewItem *AddNode(Node* node);
-
-  /**
-   * @brief Slot when a Node is removed from a graph (SetGraph() connects this)
-   *
-   * This should NEVER be called directly, only connected to a NodeGraph. To remove a Node from the NodeGraph
-   * use NodeGraph::RemoveNode().
-   */
-  void RemoveNode(Node* node);
-
   NodeViewEdge *AddEdge(Node *output, const NodeInput& input);
   void RemoveEdge(Node *output, const NodeInput& input);
 
@@ -113,10 +97,6 @@ private:
 
   NodeViewEdge* AddEdgeInternal(Node *output, const NodeInput &input, NodeViewItem* from, NodeViewItem* to);
 
-  void ConnectNode(Node *n);
-
-  void DisconnectNode(Node *n);
-
   QHash<Node*, NodeViewContext*> context_map_;
 
   QHash<Node*, NodeViewItem*> item_map_;
@@ -129,12 +109,6 @@ private:
 
   bool curved_edges_;
 
-private slots:
-  /**
-   * @brief Receiver for when a node's label has changed
-   */
-  void NodeAppearanceChanged();
-
 };
 
 }

app/widget/timelinewidget/tool/import.cpp

@@ -397,7 +397,7 @@ void ImportTool::DropGhosts(bool insert)
       command->add_child(new NodeSetPositionCommand(clip, clip, QPointF(0, 0), false));
 
       // Position footage in its context
-      command->add_child(new NodeSetPositionCommand(footage_stream.footage, clip, QPointF(-2, 0), false));
+      command->add_child(new NodeSetPositionCommand(footage_stream.footage, clip, QPointF(-3, 0), false));
 
       switch (Track::Reference::TypeFromString(footage_stream.output)) {
       case Track::kVideo:
@@ -409,7 +409,7 @@ void ImportTool::DropGhosts(bool insert)
 
         command->add_child(new NodeEdgeAddCommand(footage_stream.footage, NodeInput(transform, TransformDistortNode::kTextureInput)));
         command->add_child(new NodeEdgeAddCommand(transform, NodeInput(clip, ClipBlock::kBufferIn)));
-        command->add_child(new NodeSetPositionCommand(transform, clip, QPointF(-1, 0), false));
+        command->add_child(new NodeSetPositionCommand(transform, clip, QPointF(-2, 0), false));
         break;
       }
       case Track::kAudio:
@@ -421,7 +421,7 @@ void ImportTool::DropGhosts(bool insert)
 
         command->add_child(new NodeEdgeAddCommand(footage_stream.footage, NodeInput(volume_node, VolumeNode::kSamplesInput)));
         command->add_child(new NodeEdgeAddCommand(volume_node, NodeInput(clip, ClipBlock::kBufferIn)));
-        command->add_child(new NodeSetPositionCommand(volume_node, clip, QPointF(-1, 0), false));
+        command->add_child(new NodeSetPositionCommand(volume_node, clip, QPointF(-2, 0), false));
         break;
       }
       default: