tim/prune/undo/UndoCutAndMove.java

   1 package tim.prune.undo;
   2
   3 import tim.prune.I18nManager;
   4 import tim.prune.UpdateMessageBroker;
   5 import tim.prune.data.DataPoint;
   6 import tim.prune.data.Track;
   7 import tim.prune.data.TrackInfo;
   8
   9 /**
  10  * Undo cut and move of a track section
  11  */
  12 public class UndoCutAndMove implements UndoOperation
  13 {
  14         /** Start and end indices of section */
  15         private int _startIndex, _endIndex;
  16         /** Index of move to point */
  17         private int _moveToIndex;
  18         /** First track point in section, next track point after where it was */
  19         private DataPoint _firstTrackPoint = null, _followingTrackPoint = null;
  20         /** Next track point after where it's being moved to */
  21         private DataPoint _moveTrackPoint = null;
  22         /** Segment flags for these points */
  23         private boolean _firstSegmentFlag, _followingSegmentFlag, _moveToSegmentFlag;
  24
  25
  26         /**
  27          * Constructor
  28          * @param inTrack track object for copying segment flags
  29          * @param inStart start index of section
  30          * @param inEnd end index of section
  31          * @param inMoveTo index of moveTo point
  32          */
  33         public UndoCutAndMove(Track inTrack, int inStart, int inEnd, int inMoveTo)
  34         {
  35                 _startIndex = inStart;
  36                 _endIndex = inEnd;
  37                 _moveToIndex = inMoveTo;
  38                 // Look for first track point in section to be moved, store flag
  39                 _firstTrackPoint = inTrack.getNextTrackPoint(inStart);
  40                 if (_firstTrackPoint != null) {
  41                         _firstSegmentFlag = _firstTrackPoint.getSegmentStart();
  42                 }
  43                 // Look for following track point, store flag
  44                 _followingTrackPoint = inTrack.getNextTrackPoint(inEnd + 1);
  45                 if (_followingTrackPoint != null) {
  46                         _followingSegmentFlag = _followingTrackPoint.getSegmentStart();
  47                 }
  48                 // Look for next track point after move point, store flag
  49                 _moveTrackPoint = inTrack.getNextTrackPoint(inMoveTo);
  50                 if (_moveTrackPoint != null) {
  51                         _moveToSegmentFlag = _moveTrackPoint.getSegmentStart();
  52                 }
  53         }
  54
  55
  56         /**
  57          * @return description of operation including number of points moved
  58          */
  59         public String getDescription()
  60         {
  61                 return I18nManager.getText("undo.cutandmove") + " (" + (_endIndex - _startIndex + 1) + ")";
  62         }
  63
  64
  65         /**
  66          * Perform the undo operation on the given Track
  67          * @param inTrackInfo TrackInfo object on which to perform the operation
  68          */
  69         public void performUndo(TrackInfo inTrackInfo) throws UndoException
  70         {
  71                 // Cut and move the section back to where it was before
  72                 int numMoved = _endIndex - _startIndex + 1;
  73                 // Calculate new positions depending on whether section was moved forward or backward
  74                 if (_startIndex > _moveToIndex)
  75                 {
  76                         inTrackInfo.getTrack().cutAndMoveSection(_moveToIndex, _moveToIndex + numMoved - 1, _startIndex + numMoved);
  77                 }
  78                 else
  79                 {
  80                         inTrackInfo.getTrack().cutAndMoveSection(_moveToIndex - numMoved, _moveToIndex - 1, _startIndex);
  81                 }
  82                 // Restore segment start flags
  83                 if (_firstTrackPoint != null) {
  84                         _firstTrackPoint.setSegmentStart(_firstSegmentFlag);
  85                 }
  86                 if (_followingTrackPoint != null) {
  87                         _followingTrackPoint.setSegmentStart(_followingSegmentFlag);
  88                 }
  89                 if (_moveTrackPoint != null) {
  90                         _moveTrackPoint.setSegmentStart(_moveToSegmentFlag);
  91                 }
  92                 inTrackInfo.getSelection().clearAll();
  93                 UpdateMessageBroker.informSubscribers();
  94         }
  95 }