public void importFrom(InputStream stream) throws IOException {
// 1. wipe the view
boardView.reset();
// 2. instantiate new model and load new data
board = new Board();
board.loadFrom(stream);
board.calculateAllHints();
// 3. redraw view
updateEntireView();
// 4. setup controller
boardView.setOnKeyPressed(this);
boardView.requestFocus();
// 5. reset timer
timer.reset();
}
