static @Nullable Rectangle getGridSpanGridRect(final RadContainer grid,
                                                 final GridConstraints originalConstraints,
                                                 final Point point,
                                                 final int resizeMask) {
    int rowAtMouse = (resizeMask & (Painter.NORTH_MASK | Painter.SOUTH_MASK)) != 0
                     ? grid.getGridRowAt(point.y)
                     : -1;
    int colAtMouse = (resizeMask & (Painter.WEST_MASK | Painter.EAST_MASK)) != 0
                     ? grid.getGridColumnAt(point.x)
                     : -1;
    if (rowAtMouse != -1 || colAtMouse != -1) {
      final int origStartCol = originalConstraints.getColumn();
      final int origEndCol = originalConstraints.getColumn() + originalConstraints.getColSpan() - 1;
      int startCol = origStartCol;
      int endCol = origEndCol;
      if (colAtMouse >= 0) {
        if ((resizeMask & Painter.WEST_MASK) != 0 && colAtMouse <= endCol) {
          // resize to left
          startCol = colAtMouse;
        }
        else if ((resizeMask & Painter.EAST_MASK) != 0 && colAtMouse >= startCol) {
          endCol = colAtMouse;
        }
      }

      final int origStartRow = originalConstraints.getRow();
      final int origEndRow = originalConstraints.getRow() + originalConstraints.getRowSpan() - 1;
      int startRow = origStartRow;
      int endRow = origEndRow;
      if (rowAtMouse >= 0) {
        if ((resizeMask & Painter.NORTH_MASK) != 0 && rowAtMouse <= endRow) {
          startRow = rowAtMouse;
        }
        else if ((resizeMask & Painter.SOUTH_MASK) != 0 && rowAtMouse >= startRow) {
          endRow = rowAtMouse;
        }
      }

      return new Rectangle(startCol, startRow, endCol-startCol+1, endRow-startRow+1);
    }
    return null;
  }
static @Nullable Rectangle getGridSpanGridRect(final RadContainer grid,
                                                 final GridConstraints originalConstraints,
                                                 final Point point,
                                                 final int resizeMask)