private void checkGridTouch(int x, int y) {
if (!board.isInGrid(x, y)) return;
Pair touchedTile = null;
try {
touchedTile = board.touchedTile(x, y);
} catch (SudokuException e) {
Log.e(Sudoiku.TAG, e.getMessage());
return;
}
sudokuModel.selectTile(touchedTile.a(), touchedTile.b());
}
