[fix] Next Frame doesn't jump to t+1s

ApplicationComponents/lqPlayerControlsController.cxx

@@ -239,6 +239,22 @@ void lqPlayerControlsController::setSceneTime(double time)
   this->Scene->setAnimationTime(time);
 }
 
+//-----------------------------------------------------------------------------
+void lqPlayerControlsController::onNextFrame()
+{
+  // need to change the mode as in realtime next frame is actually t = t+1s
+  SetProperty(this->Scene, "PlayMode", vtkAnimationScene::PLAYMODE_SEQUENCE);
+  this->Scene->getProxy()->InvokeCommand("GoToNext");
+}
+
+//-----------------------------------------------------------------------------
+void lqPlayerControlsController::onPreviousFrame()
+{
+  // need to change the mode as in realtime previous frame is actually t = t-1s
+  SetProperty(this->Scene, "PlayMode", vtkAnimationScene::PLAYMODE_SEQUENCE);
+  this->Scene->getProxy()->InvokeCommand("GoToPrevious");
+}
+
 //-----------------------------------------------------------------------------
 void lqPlayerControlsController::setPlayMode(double speed){
   if(!this->Scene)

ApplicationComponents/lqPlayerControlsController.h

@@ -72,6 +72,9 @@ public slots:
   void onSeekFrame(int index);
   void onSeekTime (double time);
 
+  void onPreviousFrame(); // cannot override as the method is not virtual, but not needed in our case
+  void onNextFrame(); // cannot override as the method is not virtual, but not needed in our case
+
 Q_SIGNALS:
   void speedChange(double);   // Signal speed has changed
   void frameRanges(int, int); // Tirggered alongside VCR original 'TimeRanges'