timeline: allow disabling waveforms

app/widget/timelinewidget/timelinewidget.cpp

@@ -952,6 +952,11 @@ void TimelineWidget::ShowContextMenu()
     toggle_audio_units->setChecked(use_audio_time_units_);
     connect(toggle_audio_units, &QAction::triggered, this, &TimelineWidget::SetUseAudioTimeUnits);
 
+    QAction* show_waveforms = menu.addAction(tr("Show Waveforms"));
+    show_waveforms->setCheckable(true);
+    show_waveforms->setChecked(views_.first()->view()->GetShowWaveforms());
+    connect(show_waveforms, &QAction::triggered, this, &TimelineWidget::SetViewWaveformsEnabled);
+
     menu.addSeparator();
 
     QAction* properties_action = menu.addAction(tr("Properties"));
@@ -1020,6 +1025,13 @@ void TimelineWidget::ToolChanged()
   HideSnaps();
 }
 
+void TimelineWidget::SetViewWaveformsEnabled(bool e)
+{
+  foreach (TimelineAndTrackView* tview, views_) {
+    tview->view()->SetShowWaveforms(e);
+  }
+}
+
 void TimelineWidget::AddGhost(TimelineViewGhostItem *ghost)
 {
   ghost_items_.append(ghost);

app/widget/timelinewidget/timelinewidget.h

@@ -345,6 +345,8 @@ private slots:
 
   void ToolChanged();
 
+  void SetViewWaveformsEnabled(bool e);
+
 };
 
 }

app/widget/timelinewidget/view/timelineview.cpp

@@ -41,7 +41,8 @@ TimelineView::TimelineView(Qt::Alignment vertical_alignment, QWidget *parent) :
   selections_(nullptr),
   ghosts_(nullptr),
   show_beam_cursor_(false),
-  connected_track_list_(nullptr)
+  connected_track_list_(nullptr),
+  show_waveforms_(true)
 {
   Q_ASSERT(vertical_alignment == Qt::AlignTop || vertical_alignment == Qt::AlignBottom);
   setAlignment(Qt::AlignLeft | vertical_alignment);
@@ -450,9 +451,11 @@ void TimelineView::DrawBlocks(QPainter *painter, bool foreground)
           painter->drawRect(r);
 
           // Draw waveform
-          QRect waveform_rect = r.adjusted(0, text_total_height, 0, 0).toRect();
-          painter->setPen(shadow_color);
-          AudioVisualWaveform::DrawWaveform(painter, waveform_rect, this->GetScale(), track->waveform(), SceneToTime(block_left));
+          if (show_waveforms_) {
+            QRect waveform_rect = r.adjusted(0, text_total_height, 0, 0).toRect();
+            painter->setPen(shadow_color);
+            AudioVisualWaveform::DrawWaveform(painter, waveform_rect, this->GetScale(), track->waveform(), SceneToTime(block_left));
+          }
         }
 
       }

app/widget/timelinewidget/view/timelineview.h

@@ -70,6 +70,17 @@ public:
 
   Block* GetItemAtScenePos(const rational& time, int track_index) const;
 
+  bool GetShowWaveforms() const
+  {
+    return show_waveforms_;
+  }
+
+  void SetShowWaveforms(bool e)
+  {
+    show_waveforms_ = e;
+    viewport()->update();
+  }
+
 signals:
   void MousePressed(TimelineViewMouseEvent* event);
   void MouseMoved(TimelineViewMouseEvent* event);
@@ -129,6 +140,8 @@ private:
 
   TrackList* connected_track_list_;
 
+  bool show_waveforms_;
+
 };
 
 }