void () { for (int i = 0; i < myBlocks.size(); i++) { Block block1 = i == 0 ? null : myBlocks.get(i - 1); Block block2 = myBlocks.get(i); Spacing spacing = calcChildSpacing(i, block1, block2); if (spacing != null) { registerChildSpacing(block1, block2, spacing); } } }