Function SeekLeftOrRight

src/menus/SelectMenus.cpp:313–348

Handle small cursor and play head movements

// Handle small cursor and play head movements
void SeekLeftOrRight
(AudacityProject &project, double direction, SelectionOperation operation,
 SeekInfo &info)
{
   // PRL:  What I found and preserved, strange though it be:
   // During playback:  jump depends on preferences and is independent of the
   // zoom and does not vary if the key is held
   // Else: jump depends on the zoom and gets bigger if the key is held

   if( ProjectAudioIO::Get( project ).IsAudioActive() )
   {
      if( operation == CURSOR_MOVE )
         SeekWhenAudioActive( info.mSeekShort * direction,
            info.mLastSelectionAdjustment );
      else if( operation == SELECTION_EXTEND )
         SeekWhenAudioActive( info.mSeekLong * direction,
            info.mLastSelectionAdjustment );
      // Note: no action for CURSOR_CONTRACT
      return;
   }

   // If the last adjustment was very recent, we are
   // holding the key down and should move faster.
   const wxLongLong curtime = ::wxGetUTCTimeMillis();
   enum { MIN_INTERVAL = 50 };
   const bool fast =
      (curtime - info.mLastSelectionAdjustment < MIN_INTERVAL);

   info.mLastSelectionAdjustment = curtime;

   // How much faster should the cursor move if shift is down?
   enum { LARGER_MULTIPLIER = 4 };
   const double seekStep = (fast ? LARGER_MULTIPLIER : 1.0) * direction;

   SeekWhenAudioInactive( project, seekStep, TIME_UNIT_PIXELS, operation);
}

// Move the cursor forward or backward, while paused or while playing.
void DoCursorMove(