cache: behavior improvements

app/render/playbackcache.cpp

@@ -40,7 +40,9 @@ void PlaybackCache::Invalidate(const TimeRange &r)
 
   emit Invalidated(r);
 
-  SaveState();
+  if (saving_enabled_) {
+    SaveState();
+  }
 }
 
 Node *PlaybackCache::parent() const
@@ -166,7 +168,9 @@ void PlaybackCache::Validate(const TimeRange &r, bool signal)
     emit Validated(r);
   }
 
-  SaveState();
+  if (saving_enabled_) {
+    SaveState();
+  }
 }
 
 void PlaybackCache::InvalidateEvent(const TimeRange &)
@@ -179,7 +183,8 @@ Project *PlaybackCache::GetProject() const
 }
 
 PlaybackCache::PlaybackCache(QObject *parent) :
-  QObject(parent)
+  QObject(parent),
+  saving_enabled_(true)
 {
   uuid_ = QUuid::createUuid();
 }

app/render/playbackcache.h

@@ -79,6 +79,9 @@ public:
     return QFontMetrics(QFont()).height()/4;
   }
 
+  bool IsSavingEnabled() const { return saving_enabled_; }
+  void SetSavingEnabled(bool e) { saving_enabled_ = e; }
+
   QMutex *mutex() { return &mutex_; }
 
 public slots:
@@ -109,6 +112,8 @@ private:
 
   QUuid uuid_;
 
+  bool saving_enabled_;
+
   QMutex mutex_;
 
 };