Engine-Pong/Game/Behaviours/KeyboardInputsBehaviour.cs

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using System;
using System.Collections.Generic;
using Microsoft.Xna.Framework.Input;
using Syntriax.Engine.Core;
using Syntriax.Engine.Input;
namespace Pong.Behaviours;
public class KeyboardInputsBehaviour : BehaviourOverride, IButtonInputs<Keys>
{
private readonly Dictionary<Keys, Action<IButtonInputs<Keys>, Keys>?> OnPressed = new(256);
private readonly Dictionary<Keys, Action<IButtonInputs<Keys>, Keys>?> OnReleased = new(256);
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private int cachePressedCurrentlyCount = 0;
private readonly Keys[] cachePressedCurrently = new Keys[256];
private int cachePressedPreviouslyCount = 0;
private readonly Keys[] cachePressedPreviously = new Keys[256];
public void RegisterOnPress(Keys key, Action<IButtonInputs<Keys>, Keys> callback)
{
if (OnPressed.TryGetValue(key, out var action))
{
action += callback;
return;
}
OnPressed.Add(key, callback);
}
public void UnregisterOnPress(Keys key, Action<IButtonInputs<Keys>, Keys> callback)
{
if (OnPressed.TryGetValue(key, out var action))
action -= callback;
}
public void RegisterOnRelease(Keys key, Action<IButtonInputs<Keys>, Keys> callback)
{
if (OnReleased.TryGetValue(key, out var action))
{
action += callback;
return;
}
OnReleased.Add(key, callback);
}
public void UnregisterOnRelease(Keys key, Action<IButtonInputs<Keys>, Keys> callback)
{
if (OnReleased.TryGetValue(key, out var action))
action -= callback;
}
protected override void OnUpdate()
{
KeyboardState keyboardState = Keyboard.GetState();
keyboardState.GetPressedKeys(cachePressedCurrently);
cachePressedCurrentlyCount = keyboardState.GetPressedKeyCount();
for (int i = 0; i < cachePressedCurrentlyCount; i++)
{
Keys currentlyPressedKey = cachePressedCurrently[i];
if (!OnPressed.TryGetValue(currentlyPressedKey, out var action))
continue;
if (WasPressed(currentlyPressedKey))
continue;
action?.Invoke(this, currentlyPressedKey);
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}
for (int i = 0; i < cachePressedPreviouslyCount; i++)
{
Keys previouslyPressedKey = cachePressedPreviously[i];
if (!OnReleased.TryGetValue(previouslyPressedKey, out var action))
continue;
if (IsPressed(previouslyPressedKey))
continue;
action?.Invoke(this, previouslyPressedKey);
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}
Array.Copy(cachePressedCurrently, cachePressedPreviously, cachePressedCurrentlyCount);
cachePressedPreviouslyCount = cachePressedCurrentlyCount;
}
public bool IsPressed(Keys key)
{
for (int i = 0; i < cachePressedCurrentlyCount; i++)
if (cachePressedCurrently[i] == key)
return true;
return false;
}
public bool WasPressed(Keys key)
{
for (int i = 0; i < cachePressedPreviouslyCount; i++)
if (cachePressedPreviously[i] == key)
return true;
return false;
}
}