Initial commit

Lts/Plugins/AudioVideoManagement/Gui/AVMenuEdit/interval_model.h

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+/**
+  * @RDE_HEADER@
+  * IntervalModel
+  * $Id$
+  * $HeadURL$
+  * $Author$
+  * Created by Christian Fröbel, SLSE, 2017-07-19
+  */
+
+#pragma once
+
+#include <AudioVideoManagement/ava_types.h>
+#include <LtsWidgets/lts_abstract_table_model.h>
+#include <boost/optional.hpp>
+
+
+namespace AudioVideoManagement
+{
+
+/**
+ * Model for the Timeline so it can be shown in a TabView.
+ * This is a poor man's version as the timeline is displayed in a table.
+ * Later it will probably be replaced by something more usable.
+ * @author Christian Fröbel
+ */
+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; }
+
+  /**
+   * If the current position is within an interval:
+   * - and the position is at least 2s into the interval, return that
+   * - otherwise return the previous interval (unless there is none).
+   * If the current position is between two intervals return the one before
+   * the current position.
+   */
+  const AvaTimelinePart &previousInterval() const;
+  const AvaTimelinePart &nextInterval() const;
+
+signals:
+  /**
+   * Emitted if the current interval changed either due to
+   * setCurrentPosition() or reset().
+   * There must not always be a current interval as the current position
+   * can also be between two intervals.
+   * @param rowIndex might be invalid if the current position is between intervals.
+   */
+  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;
+
+  /**
+   * A HalfIndex denotes the current position within or between intervals.
+   * The counting of indices is done as follows:
+   *  -1   0   1   2   3   4   5   6   7
+   *     -----   -----   -----   -----      # intervals 0...3
+   * Examples:
+   * within interval with index i => halfIndex = 2*i
+   * before interval with index i => halfIndex = 2*i-1
+   * after  interval with index i => halfIndex = 2*i+1
+   */
+  using HalfIndex = int;
+  HalfIndex   intervalForPos(AvaTimePoint pos) const;
+
+  boost::optional<AvaTimePoint>   m_currentPos;
+  boost::optional<HalfIndex>      m_currentInterval;
+
+  int m_timezoneHoursOffset = 0;
+};
+
+} // namespace AudioVideoManagement