waveformview: show in/out points in waveformview

Moved drawing routines to the base class that is used by both TimeRuler
and WaveformView

app/widget/timeruler/seekablewidget.h

@@ -31,6 +31,8 @@ protected:
 
   virtual void ScaleChangedEvent(const double&) override;
 
+  void DrawTimelinePoints(QPainter *p, int marker_bottom = 0);
+
   TimelinePoints* timeline_points() const;
 
   double ScreenToUnitFloat(int screen);
@@ -42,6 +44,16 @@ protected:
 
   int TimeToScreen(const rational& time);
 
+  void DrawPlayhead(QPainter* p, int x, int y);
+
+  inline const int& text_height() const {
+    return text_height_;
+  }
+
+  inline const int& playhead_width() const {
+    return playhead_width_;
+  }
+
   inline const QColor& GetPlayheadColor() const
   {
     return style_.GetPlayheadColor();
@@ -67,6 +79,10 @@ private:
 
   int scroll_;
 
+  int text_height_;
+
+  int playhead_width_;
+
 };
 
 #endif // SEEKABLEWIDGET_H