snuvi-engine/src/me/hammerle/snuviengine/api/Keys.java

package me.hammerle.snuviengine.api;

import java.util.HashMap;

public final class Keys {
    private final HashMap<Integer, Key> bindings = new HashMap<>();
    private Key rebind = null;

    protected Keys() {
    }

    public Key register(int key) {
        if(bindings.containsKey(key)) {
            return null;
        }
        Key binding = new Key(key);
        bindings.put(key, binding);
        return binding;
    }

    public void rebindOnNextKeyPress(Key binding) {
        rebind = binding;
        if(binding != null) {
            binding.setRebinding(true);
        }
    }

    public void rebind(Key binding, int key) {
        if(bindings.get(binding.getKey()) == binding) {
            bindings.remove(binding.getKey());
        }
        binding.setKey(key);
        bindings.put(key, binding);
    }

    protected void press(int key) {
        if(isRebinding()) {
            rebindMarkedBinding(key);
            return;
        }
        Key binding = bindings.get(key);
        if(binding != null) {
            binding.press();
        }
    }

    private boolean isRebinding() {
        return rebind != null;
    }

    private void rebindMarkedBinding(int key) {
        rebind.setRebinding(false);
        if(!bindings.containsKey(key)) {
            rebind(rebind, key);
        }
        rebind = null;
    }

    protected void release(int key) {
        Key binding = bindings.get(key);
        if(binding != null) {
            binding.release();
        }
    }

    protected void tick() {
        bindings.values().forEach(binding -> binding.tick());
    }
}