minecraft-kajetans-mod/src/main/java/me/km/networking/KeyManager.java

package me.km.networking;

import net.minecraft.client.settings.KeyBinding;
import net.minecraftforge.fml.client.registry.ClientRegistry;
import net.minecraftforge.fml.common.eventhandler.SubscribeEvent;
import net.minecraftforge.fml.common.gameevent.TickEvent;
import net.minecraftforge.fml.relauncher.Side;
import net.minecraftforge.fml.relauncher.SideOnly;
import org.lwjgl.input.Keyboard;

@SideOnly(Side.CLIENT)
public class KeyManager 
{
    private KeyBinding[] functionKeys;
    
    public KeyManager()
    {
        functionKeys = new KeyBinding[9];
        functionKeys[0] = register(1, Keyboard.KEY_G);
        functionKeys[1] = register(2, Keyboard.KEY_H);
        functionKeys[2] = register(3, Keyboard.KEY_J);
        functionKeys[3] = register(4, Keyboard.KEY_K);
        functionKeys[4] = register(5, Keyboard.KEY_V);
        functionKeys[5] = register(6, Keyboard.KEY_B);
        functionKeys[6] = register(7, Keyboard.KEY_N);
        functionKeys[7] = register(8, Keyboard.KEY_M);
        functionKeys[8] = register(9, Keyboard.KEY_COMMA);
    }
    
    private KeyBinding register(int id, int key)
    {
        KeyBinding keyBind =  new KeyBinding("key.function." + id, key, "key.km.function");
        ClientRegistry.registerKeyBinding(keyBind);
        return keyBind;
    }
    
    private int getFirstPressedKey()
    {
        for(int i = 0; i < 9; i++)
        {
            if(functionKeys[i].isPressed())
            {
                return i + 1;
            }
        }
        return -1;
    }
    
    @SubscribeEvent
    public void onRenderGui(TickEvent.ClientTickEvent e)
    {
        int key = getFirstPressedKey();
        if(key != -1)
        {
            ModPacketHandler.sendFunctionKey(key);
        }
    }
}