Tutorial 1.18 Episode 7

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In this tutorial we explain various ways that you can store data and also communicate that data to the client. We will cover world data, player capabilities, and networking. In addition we also cover a new way to make render overlays (HUD's)

Key Bindings

In this tutorial we want a key binding that the player can press to gather mana from the chunk. How we will store and make this mana is for later but let's first make the key binding. First add the class to actually define the key binding (KeyBindings.java on Github). In this class we make a new keymapping which by default is assigned to the period key. The player can reconfigure this in the standard Minecraft options screen:

public class KeyBindings {

    public static final String KEY_CATEGORIES_TUTORIAL = "key.categories.tutorial";
    public static final String KEY_GATHER_MANA = "key.gatherMana";

    public static KeyMapping gatherManaKeyMapping;

    public static void init() {
        // Use KeyConflictContext.IN_GAME to indicate this key is meant for usage in-game
        gatherManaKeyMapping = new KeyMapping(KEY_GATHER_MANA, KeyConflictContext.IN_GAME, InputConstants.getKey("key.keyboard.period"), KEY_CATEGORIES_TUTORIAL);

We also need to call this method. We do that in ClientSetup.init():

    public static void init(FMLClientSetupEvent event) {

In addition to the key binding we also need an input handler. That input handler will be called whenever the key is pressed. To do this we listen to the KeyInputEvent and when that event is received we consume the keypress (so it doesn't get used for something else) and send a message to the server:

18px-OOjs_UI_icon_notice-destructive.svg.png Warning: To also allow the player to bind this action on a mouse button you would also need to listen to InputEvent.MouseInputEvent
public class KeyInputHandler {

    public static void onKeyInput(InputEvent.KeyInputEvent event) {
        if (KeyBindings.gatherManaKeyMapping.consumeClick()) {
            Messages.sendToServer(new PacketGatherMana());