various: moved time from viewer UI to viewer node

app/widget/timebased/timebasedview.cpp

@@ -38,7 +38,8 @@ TimeBasedView::TimeBasedView(QWidget *parent) :
   snapped_(false),
   snap_service_(nullptr),
   y_axis_enabled_(false),
-  y_scale_(1.0)
+  y_scale_(1.0),
+  viewer_(nullptr)
 {
   // Sets scene to our scene
   setScene(&scene_);
@@ -142,12 +143,17 @@ void TimeBasedView::SetYScale(const double &y_scale)
   }
 }
 
-void TimeBasedView::SetTime(const rational &time)
+void TimeBasedView::SetViewerNode(ViewerOutput *v)
 {
-  playhead_ = time;
+  if (viewer_) {
+    disconnect(viewer_, &ViewerOutput::PlayheadChanged, viewport(), static_cast<void(QWidget::*)()>(&TimeBasedView::update));
+  }
 
-  // Force redraw for playhead
-  viewport()->update();
+  viewer_ = v;
+
+  if (viewer_) {
+    connect(viewer_, &ViewerOutput::PlayheadChanged, viewport(), static_cast<void(QWidget::*)()>(&TimeBasedView::update));
+  }
 }
 
 void TimeBasedView::drawForeground(QPainter *painter, const QRectF &rect)
@@ -203,20 +209,21 @@ bool TimeBasedView::PlayheadMove(QMouseEvent *event)
     return false;
   }
 
-  QPointF scene_pos = mapToScene(event->pos());
-  rational mouse_time = qMax(rational(0), SceneToTime(scene_pos.x()));
+  if (viewer_) {
+    QPointF scene_pos = mapToScene(event->pos());
+    rational mouse_time = qMax(rational(0), SceneToTime(scene_pos.x()));
 
-  if (Core::instance()->snapping() && snap_service_) {
-    rational movement;
+    if (Core::instance()->snapping() && snap_service_) {
+      rational movement;
 
-    snap_service_->SnapPoint({mouse_time}, &movement, TimeBasedWidget::kSnapAll & ~TimeBasedWidget::kSnapToPlayhead);
+      snap_service_->SnapPoint({mouse_time}, &movement, TimeBasedWidget::kSnapAll & ~TimeBasedWidget::kSnapToPlayhead);
 
-    mouse_time += movement;
+      mouse_time += movement;
+    }
+
+    viewer_->SetPlayhead(mouse_time);
   }
 
-  SetTime(mouse_time);
-  emit TimeChanged(mouse_time);
-
   return true;
 }
 
@@ -237,7 +244,11 @@ bool TimeBasedView::PlayheadRelease(QMouseEvent*)
 
 qreal TimeBasedView::GetPlayheadX()
 {
-  return TimeToScene(playhead_);
+  if (viewer_) {
+    return TimeToScene(viewer_->GetPlayhead());
+  } else {
+    return 0;
+  }
 }
 
 void TimeBasedView::SetEndTime(const rational &length)