public static TGUndoableTripletFeel startUndo(TGContext context, TGMeasureHeader header) {
TGUndoableTripletFeel undoable = new TGUndoableTripletFeel(context);
undoable.doAction = UNDO_ACTION;
undoable.position = header.getStart();
undoable.undoableTripletFeel = header.getTripletFeel();
undoable.nextTripletFeelPositions = new ArrayList<Object>();
int prevTripletFeel = undoable.undoableTripletFeel;
Iterator<TGMeasureHeader> it = getSong(context).getMeasureHeaders();
while (it.hasNext()) {
TGMeasureHeader currHeader = it.next();
if (currHeader.getStart() > undoable.position) {
int currTripletFeel = currHeader.getTripletFeel();
if (prevTripletFeel != currTripletFeel) {
TripletFeelPosition tfp =
undoable.new TripletFeelPosition(currHeader.getStart(), currTripletFeel);
undoable.nextTripletFeelPositions.add(tfp);
}
prevTripletFeel = currTripletFeel;
}
}
return undoable;
}
public TGUndoableEdit startUndoable(TGContext context, TGActionContext actionContext) {
return TGUndoableTripletFeel.startUndo(
context,
(TGMeasureHeader) actionContext.getAttribute(TGDocumentContextAttributes.ATTRIBUTE_HEADER));
}