tim/prune/undo/UndoDeleteOperation.java

   1 package tim.prune.undo;
   2
   3 import tim.prune.data.TrackInfo;
   4
   5 /**
   6  * Abstract class to hold the selection handling required by all
   7  * Undo operations which have undeleted something
   8  */
   9 public abstract class UndoDeleteOperation implements UndoOperation
  10 {
  11         /**
  12          * Modify the current point/range selection after the delete operation is undone
  13          * @param inTrackInfo track info object
  14          * @param inStartIndex start index of reinserted range
  15          * @param inEndIndex end index of reinserted range
  16          */
  17         protected static void modifySelection(TrackInfo inTrackInfo, int inStartIndex, int inEndIndex)
  18         {
  19                 final int numPointsInserted = inEndIndex - inStartIndex + 1;
  20                 // See if there is a currently selected point, if so does it need to be modified
  21                 final int currentPoint = inTrackInfo.getSelection().getCurrentPointIndex();
  22                 if (currentPoint >= inStartIndex)
  23                 {
  24                         inTrackInfo.selectPoint(currentPoint + numPointsInserted);
  25                 }
  26                 // Same for currently selected range
  27                 int rangeStart = inTrackInfo.getSelection().getStart();
  28                 int rangeEnd   = inTrackInfo.getSelection().getEnd();
  29                 if (rangeEnd >= inStartIndex && rangeEnd > rangeStart)
  30                 {
  31                         rangeEnd += numPointsInserted;
  32                         if (rangeStart >= inStartIndex) {
  33                                 rangeStart += numPointsInserted;
  34                         }
  35                         inTrackInfo.getSelection().selectRange(rangeStart, rangeEnd);
  36                 }
  37         }
  38 }