Keyboard

This page contains information and code snippets for detecting keyboard inputs from the client.

Detecting a key input

There is no one "correct" way of detecting a key input, but the easiest is to mixin into KeyboardHandler

@Mixin(KeyboardHandler.class)
public class KeyboardHandlerMixin {
    @Inject(method = "keyPress", at = @At("HEAD"), cancellable = true)
    private void onKeyPress(long window, int action, KeyEvent event, CallbackInfo ci) {
        if (action == 1) {
            // Key pressed
        } else if (action == 0) {
            // Key released
        }
    }
}

Checking if a key is pressed

The two primary ways to check if a key is pressed are:

Using Minecraft's InputConstants

fun isPressed(key: Int): Boolean {
    return InputConstants.isKeyDown(client.window.handle(), key)
}

Using GLFW

fun isPressed(key: Int): Boolean {
    val state = GLFW.glfwGetKey(client.window.handle(), key)
    return state == GLFW.GLFW_PRESS || state == GLFW.GLFW_REPEAT
}