Adds initial intermediate qt6 porting state

qt6-after/qt6-migrated-legatus/Lts/Plugins/AudioVideoManagement/Gui/AVMenuEdit/interval_model.h

@@ -0,0 +1,66 @@
+
+
+
+#pragma once
+
+#include <AudioVideoManagement/ava_types.h>
+#include <LtsWidgets/lts_abstract_table_model.h>
+#include <boost/optional.hpp>
+
+
+namespace AudioVideoManagement
+{
+
+
+
+class IntervalModel : public LtsWidgets::LtsAbstractTableModel<AvaTimelinePart>
+{
+  Q_OBJECT
+
+public:
+  enum Columns
+  {
+    Start = 0,
+    End,
+    Duration,
+  };
+
+  IntervalModel();
+  QVariant data(const QModelIndex &index, int role) const override;
+
+  void reset();
+
+  bool isEmpty() const { return m_vecData.isEmpty(); }
+
+  void setCurrentPosition(AvaTimePoint pos, bool forceSignal = false);
+  boost::optional<AvaTimePoint> currentPosition() const { return m_currentPos; }
+
+  
+
+  const AvaTimelinePart &previousInterval() const;
+  const AvaTimelinePart &nextInterval() const;
+
+signals:
+  
+
+  void currentIntervalChanged(bool hasPreviousInterval, bool hasNextInterval, const QModelIndex &rowIndex);
+
+public slots:
+  void setTimezoneHoursOffset(int timezoneHoursOffset);
+
+private:
+  QString dateTimeToStringy(const QDateTime &dt) const;
+  QString msecsSinceEpochToStringy(qint64 msecs) const;
+
+  
+
+  using HalfIndex = int;
+  HalfIndex   intervalForPos(AvaTimePoint pos) const;
+
+  boost::optional<AvaTimePoint>   m_currentPos;
+  boost::optional<HalfIndex>      m_currentInterval;
+
+  int m_timezoneHoursOffset = 0;
+};
+
+}