started new timeline paradigm

ui/timelinearea.cpp

@@ -0,0 +1,36 @@
+#include "timelinearea.h"
+
+TimelineArea::TimelineArea() :
+  track_list_(nullptr)
+{
+
+}
+
+void TimelineArea::SetTrackList(Sequence *sequence, Track::Type track_list)
+{
+  if (sequence == nullptr) {
+
+    track_list_ = nullptr;
+
+  } else {
+
+    track_list_ = sequence->GetTrackList(track_list);
+
+  }
+
+
+}
+
+void TimelineArea::RefreshLabels()
+{
+  if (track_list_ == nullptr) {
+    labels_.clear();
+  } else {
+
+    labels_.resize(track_list_->TrackCount());
+    for (int i=0;i<labels_.size();i++) {
+      labels_.at(i).settra
+    }
+
+  }
+}