Java key bindings with multiple actions

Question

So for reference, I am following Trystan's roguelike tutorial for java.

The tutorial above uses Key Listeners, which does not work for Mac OS X (and appears to be discouraged by the community), so I am trying to change the code to use Key Bindings instead.

Here's the question. In his "roguelike game", the game is divided into screens, where each screen has separate actions for a particular key. For instance, the "Start Screen" sends the player to the "Play screen" upon pressing the enter key:

public class StartScreen implements Screen {

    public void displayOutput(AsciiPanel terminal) {
        terminal.write("rl tutorial", 1, 1);
        terminal.writeCenter("-- press [enter] to start --", 22);
    }

    public Screen respondToUserInput(KeyEvent key) {
        return key.getKeyCode() == KeyEvent.VK_ENTER ? new PlayScreen() : this;
    }
}

While the "Play Screen" sends the player to the "Win screen" upon pressing the enter key:

public class PlayScreen implements Screen {

    public void displayOutput(AsciiPanel terminal) {
        terminal.write("You are having fun.", 1, 1);
        terminal.writeCenter("-- press [escape] to lose or [enter] to win --", 22);
    }

    public Screen respondToUserInput(KeyEvent key) {
        switch (key.getKeyCode()){
        case KeyEvent.VK_ESCAPE: return new LoseScreen();
        case KeyEvent.VK_ENTER: return new WinScreen();
        }

        return this;
    }
}

Now, from what I can see from Key Bindings examples such as this and this, all the bindings and actions seem to be "dumped" into one class. This is unsatisfactory, because:

One keystroke leads to only one action (I suppose I could have the action do a switch case, and check what screen I am in, and then execute some code specific to said screen, but perhaps there is a better way.)
It becomes more difficult to determine what action is from/for what screen.

Would there be a way to get Key Bindings to have one keystroke execute different actions depending on the "Screen"? Would I just use conditionals? Can I put Key Binding logic in other classes (Screens) and then call them in the main class, like what is happening with Key Listeners above?

Java key bindings with multiple actions

Answers (1)

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