Bind key presses to methods in Unity at runtime

InputEvents.cs

using UnityEngine;
using System.Collections;
using System.Collections.Generic;

public delegate void InputKeyDelegate (KeyCode key);

public delegate void InputAxisDelegate (string name,float value);

public class InputEvents : MonoBehaviour
{
	
	private static Dictionary<KeyCode, List<InputKeyDelegate>> keyDownsDict = new Dictionary<KeyCode, List<InputKeyDelegate>> ();
	private static Dictionary<KeyCode, List<InputKeyDelegate>> keysDict = new Dictionary<KeyCode, List<InputKeyDelegate>> ();
	private static Dictionary<KeyCode, List<InputKeyDelegate>> keyUpsDict = new Dictionary<KeyCode, List<InputKeyDelegate>> ();
	
	private static Dictionary<string, List<InputAxisDelegate>> axesDict = new Dictionary<string, List<InputAxisDelegate>> ();
	
	
	#region Generic Binders
	
	private static void BindKeys (Dictionary<KeyCode, List<InputKeyDelegate>> keyDelegateDict, InputKeyDelegate method, params KeyCode[] keys)
	{
		foreach (KeyCode key in keys) {
			List<InputKeyDelegate> delegateList;
			keyDelegateDict.TryGetValue (key, out delegateList);
			if (delegateList == null) {
				delegateList = new List<InputKeyDelegate> ();
				keyDelegateDict.Add (key, delegateList);
			}
			delegateList.Add (method);
		}
	}
	
	private static void UnbindKeys (Dictionary<KeyCode, List<InputKeyDelegate>> keyDelegateDict, InputKeyDelegate method, params KeyCode[] keys)
	{
		foreach (KeyCode key in keys) {
			List<InputKeyDelegate> delegateList;
			keyDelegateDict.TryGetValue (key, out delegateList);
			if (delegateList != null) {
				for (int i = 0; i < delegateList.Count; i++) {
					if (delegateList [i] == method) {
						delegateList.RemoveAt (i);
					}
				}
			}
		}
	}
	
	#endregion
	
	
	#region Binding Methods
	
	public static void BindKeyDown (InputKeyDelegate method, params KeyCode[] keys)
	{
		BindKeys (keyDownsDict, method, keys);
	}
	
	public static void UnbindKeyDown (InputKeyDelegate method, params KeyCode[] keys)
	{
		UnbindKeys (keyDownsDict, method, keys);
	}
	
	public static void BindKeyUp (InputKeyDelegate method, params KeyCode[] keys)
	{
		BindKeys (keyUpsDict, method, keys);
	}
	
	public static void UnBindKeyUp (InputKeyDelegate method, params KeyCode[] keys)
	{
		UnbindKeys (keyUpsDict, method, keys);
	}
	
	public static void BindKey (InputKeyDelegate method, params KeyCode[] keys)
	{
		BindKeys (keysDict, method, keys);
	}
	
	public static void UnBindKey (InputKeyDelegate method, params KeyCode[] keys)
	{
		UnbindKeys (keysDict, method, keys);
	}
	
	
	public static void BindAxis (InputAxisDelegate method, params string[] axes)
	{
		foreach (string axis in axes) {
			List<InputAxisDelegate> delegateList;
			axesDict.TryGetValue (axis, out delegateList);
			if (delegateList == null) {
				delegateList = new List<InputAxisDelegate> ();
				axesDict.Add (axis, delegateList);
			}
			delegateList.Add (method);
		}
	}
	
	public static void UnbindAxis (InputAxisDelegate method, params string[] axes)
	{
		foreach (string axis in axes) {
			List<InputAxisDelegate> delegateList;
			axesDict.TryGetValue (axis, out delegateList);
			if (delegateList != null) {
				for (int i = 0; i < delegateList.Count; i++) {
					if (delegateList [i] == method) {
						delegateList.RemoveAt (i);
					}
				}
			}
		}
	}
	
	#endregion
	
	#region Unity Events
	
	public void Update ()
	{
		foreach (var kvp in keyDownsDict) {
			if (Input.GetKeyDown (kvp.Key)) {
				foreach (InputKeyDelegate method in kvp.Value) {
					method (kvp.Key);
				}
			}
		}
		foreach (var kvp in keysDict) {
			if (Input.GetKey (kvp.Key)) {
				foreach (InputKeyDelegate method in kvp.Value) {
					method (kvp.Key);
				}
			}
		}
		foreach (var kvp in keyUpsDict) {
			if (Input.GetKeyUp (kvp.Key)) {
				foreach (InputKeyDelegate method in kvp.Value) {
					method (kvp.Key);
				}
			}
		}
		foreach (var kvp in axesDict) {
			float val = Input.GetAxis (kvp.Key);
			foreach (InputAxisDelegate method in kvp.Value) {
				method (kvp.Key, val);
			}
		}
	}
	
	#endregion
}