File size: 2,488 Bytes
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using UnityEngine.EventSystems;
namespace UnityEngine.InputSystem.UI
{
/// <summary>
/// A modified EventSystem class, which allows multiple players to have their own instances of a UI,
/// each with it's own selection.
/// </summary>
/// <remarks>
/// You can use the <see cref="playerRoot"/> property to specify a part of the hierarchy belonging to the current player.
/// Mouse selection will ignore any game objects not within this hierarchy, and all other navigation, using keyboard or
/// gamepad for example, will be constrained to game objects under that hierarchy.
/// </remarks>
[HelpURL(InputSystem.kDocUrl + "/manual/UISupport.html#multiplayer-uis")]
public class MultiplayerEventSystem : EventSystem
{
[Tooltip("If set, only process mouse and navigation events for any game objects which are children of this game object.")]
[SerializeField] private GameObject m_PlayerRoot;
/// <summary>
/// The root object of the UI hierarchy that belongs to the given player.
/// </summary>
/// <remarks>
/// This can either be an entire <c>Canvas</c> or just part of the hierarchy of
/// a specific <c>Canvas</c>.
/// </remarks>
public GameObject playerRoot
{
get => m_PlayerRoot;
set
{
m_PlayerRoot = value;
InitializePlayerRoot();
}
}
protected override void OnEnable()
{
base.OnEnable();
InitializePlayerRoot();
}
protected override void OnDisable()
{
base.OnDisable();
}
private void InitializePlayerRoot()
{
if (m_PlayerRoot == null) return;
var inputModule = GetComponent<InputSystemUIInputModule>();
if (inputModule != null)
inputModule.localMultiPlayerRoot = m_PlayerRoot;
}
protected override void Update()
{
var originalCurrent = current;
current = this; // in order to avoid reimplementing half of the EventSystem class, just temporarily assign this EventSystem to be the globally current one
try
{
base.Update();
}
finally
{
current = originalCurrent;
}
}
}
}
#endif
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