implemented basic track delete function

app/node/output/track/tracklist.h

@@ -71,6 +71,16 @@ public:
   void ArrayAppend(bool undoable = false);
   void ArrayRemoveLast(bool undoable = false);
 
+  int GetArrayIndexFromCacheIndex(int index) const
+  {
+    return track_array_indexes_.at(index);
+  }
+
+  int GetCacheIndexFromArrayIndex(int index) const
+  {
+    return track_array_indexes_.indexOf(index);
+  }
+
 public slots:
   /**
    * @brief Slot for when the track connection is added
@@ -100,16 +110,6 @@ private:
   QVector<Track*> track_cache_;
   QVector<int> track_array_indexes_;
 
-  int GetArrayIndexFromCacheIndex(int index) const
-  {
-    return track_array_indexes_.at(index);
-  }
-
-  int GetCacheIndexFromArrayIndex(int index) const
-  {
-    return track_array_indexes_.indexOf(index);
-  }
-
   QString track_input_;
 
   rational total_length_;

app/widget/timelinewidget/trackview/trackviewitem.cpp

@@ -26,6 +26,10 @@
 #include <QPainter>
 #include <QtMath>
 
+#include "core.h"
+#include "widget/menu/menu.h"
+#include "widget/timelinewidget/undo/timelineundogeneral.h"
+
 namespace olive {
 
 TrackViewItem::TrackViewItem(Track* track, QWidget *parent) :
@@ -63,8 +67,10 @@ TrackViewItem::TrackViewItem(Track* track, QWidget *parent) :
   layout->addWidget(lock_button_);
 
   setMinimumHeight(mute_button_->height());
+  setContextMenuPolicy(Qt::CustomContextMenu);
 
   connect(track, &Track::MutedChanged, mute_button_, &QPushButton::setChecked);
+  connect(this, &QWidget::customContextMenuRequested, this, &TrackViewItem::ShowContextMenu);
 }
 
 QPushButton *TrackViewItem::CreateMSLButton(const QString& text, const QColor& checked_color) const
@@ -114,4 +120,19 @@ void TrackViewItem::UpdateLabel()
   label_->setText(track_->GetLabelOrName());
 }
 
+void TrackViewItem::ShowContextMenu(const QPoint &p)
+{
+  Menu m(this);
+
+  QAction *delete_action = m.addAction(tr("&Delete"));
+  connect(delete_action, &QAction::triggered, this, &TrackViewItem::DeleteTrack, Qt::QueuedConnection);
+
+  m.exec(mapToGlobal(p));
+}
+
+void TrackViewItem::DeleteTrack()
+{
+  Core::instance()->undo_stack()->push(new TimelineRemoveTrackCommand(track_));
+}
+
 }

app/widget/timelinewidget/trackview/trackviewitem.h

@@ -61,6 +61,10 @@ private slots:
 
   void UpdateLabel();
 
+  void ShowContextMenu(const QPoint &p);
+
+  void DeleteTrack();
+
 };
 
 }

app/widget/timelinewidget/trackview/trackviewsplitter.cpp

@@ -108,7 +108,7 @@ void TrackViewSplitter::SetHeightWithSizes(QList<int> sizes)
   if (alignment_ == Qt::AlignBottom) {
     sizes.replace(0, spacer_height_);
   } else {
-    sizes.replace(count() - 1, spacer_height_);
+    sizes.replace(sizes.size() - 1, spacer_height_);
   }
 
   foreach (int s, sizes) {

app/widget/timelinewidget/undo/timelineundogeneral.cpp

@@ -591,4 +591,22 @@ void TrackReplaceBlockWithGapCommand::CreateRemoveTransitionCommandIfNecessary(b
   }
 }
 
+void TimelineRemoveTrackCommand::redo()
+{
+  list_ = track_->sequence()->track_list(track_->type());
+
+  index_ = list_->GetArrayIndexFromCacheIndex(track_->Index());
+
+  Node::DisconnectEdge(track_, list_->track_input(index_));
+
+  list_->parent()->InputArrayRemove(list_->track_input(), index_);
+}
+
+void TimelineRemoveTrackCommand::undo()
+{
+  list_->parent()->InputArrayInsert(list_->track_input(), index_);
+
+  Node::ConnectEdge(track_, list_->track_input(index_));
+}
+
 }

app/widget/timelinewidget/undo/timelineundogeneral.h

@@ -163,6 +163,32 @@ private:
 
 };
 
+class TimelineRemoveTrackCommand : public UndoCommand
+{
+public:
+  TimelineRemoveTrackCommand(Track *track) :
+    track_(track)
+  {}
+
+  virtual Project* GetRelevantProject() const override
+  {
+    return track_->project();
+  }
+
+protected:
+  virtual void redo() override;
+
+  virtual void undo() override;
+
+private:
+  Track *track_;
+
+  TrackList *list_;
+
+  int index_;
+
+};
+
 class TransitionRemoveCommand : public UndoCommand {
 public:
   TransitionRemoveCommand(TransitionBlock* block, bool remove_from_graph) :