public void onAddKey(final Key newKey) { final Key key = (mKeysCache != null) ? mKeysCache.get(newKey) : newKey; final boolean isSpacer = key.isSpacer(); if (isSpacer && key.getWidth() == 0) { // Ignore zero width {@link Spacer}. return; } mKeys.add(key); if (isSpacer) { return; } updateHistogram(key); if (key.getCode() == KeyboardConstants.CODE_SHIFT) { mShiftKeys.add(key); } if (key.altCodeWhileTyping()) { mAltCodeKeysWhileTyping.add(key); } }