moved visual waveforms to block

This should be nicer, however it has a bug that I need to fix

app/node/block/block.h

@@ -129,6 +129,8 @@ signals:
 
   void LengthChanged();
 
+  void PreviewChanged();
+
 protected:
   virtual void InputValueChangedEvent(const QString& input, int element) override;
 

app/node/block/clip/clip.cpp

@@ -196,6 +196,19 @@ void ClipBlock::LinkChangeEvent()
   }
 }
 
+void ClipBlock::InputValueChangedEvent(const QString &input, int element)
+{
+  super::InputValueChangedEvent(input, element);
+
+  if (input == kMediaInInput) {
+    // Shift waveform in the inverse that the media in moved
+    rational diff = media_in() - last_media_in_;
+    waveform_.TrimIn(diff);
+
+    last_media_in_ = media_in();
+  }
+}
+
 TimeRange ClipBlock::InputTimeAdjustment(const QString& input, int element, const TimeRange& input_time) const
 {
   Q_UNUSED(element)

app/node/block/clip/clip.h

@@ -21,6 +21,7 @@
 #ifndef CLIPBLOCK_H
 #define CLIPBLOCK_H
 
+#include "audio/audiovisualwaveform.h"
 #include "node/block/block.h"
 
 namespace olive {
@@ -95,6 +96,11 @@ public:
     return block_links_;
   }
 
+  AudioVisualWaveform& waveform()
+  {
+    return waveform_;
+  }
+
   static const QString kBufferIn;
   static const QString kMediaInInput;
   static const QString kSpeedInput;
@@ -103,6 +109,8 @@ public:
 protected:
   virtual void LinkChangeEvent() override;
 
+  virtual void InputValueChangedEvent(const QString &input, int element) override;
+
 private:
   rational SequenceToMediaTime(const rational& sequence_time, bool ignore_reverse = false) const;
 
@@ -113,6 +121,12 @@ private:
   TransitionBlock* in_transition_;
   TransitionBlock* out_transition_;
 
+private:
+  AudioVisualWaveform waveform_;
+
+  rational last_media_in_;
+
+
 };
 
 }