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using System;
using System.Collections.Generic;
namespace UnityEngine.EventSystems
{
[RequireComponent(typeof(EventSystem))]
public abstract class BaseInputModule : UIBehaviour
{
[NonSerialized]
protected List<RaycastResult> m_RaycastResultCache = new List<RaycastResult>();
private AxisEventData m_AxisEventData;
private EventSystem m_EventSystem;
private BaseEventData m_BaseEventData;
#region 输入系统
// 如果m_InputOverride不为空就用它，否则用默认的m_DefaultInput
// 如果要自己实现BaseInput，继承此类并给这个字段赋值
// StandaloneInputModule没有自定义，直接采用的是BaseInput
protected BaseInput m_InputOverride;
private BaseInput m_DefaultInput;
public BaseInput input
{
get
{
if (m_InputOverride != null)
return m_InputOverride;
if (m_DefaultInput == null)
{
var inputs = GetComponents<BaseInput>();
foreach (var baseInput in inputs)
{
// We dont want to use any classes that derrive from BaseInput for default.
if (baseInput != null && baseInput.GetType() == typeof(BaseInput))
{
m_DefaultInput = baseInput;
break;
}
}
if (m_DefaultInput == null)
m_DefaultInput = gameObject.AddComponent<BaseInput>();
}
return m_DefaultInput;
}
}
#endregion
protected EventSystem eventSystem
{
get { return m_EventSystem; }
}
protected override void OnEnable()
{
base.OnEnable();
if(input != null)
{
}
m_EventSystem = GetComponent<EventSystem>();
m_EventSystem.UpdateModules(); // 把此input module加入EventSystem
}
protected override void OnDisable()
{
m_EventSystem.UpdateModules();// 把此input module移出EventSystem
base.OnDisable();
}
public abstract void Process();
protected static RaycastResult FindFirstRaycast(List<RaycastResult> candidates)
{
for (var i = 0; i < candidates.Count; ++i)
{
if (candidates[i].gameObject == null)
continue;
return candidates[i];
}
return new RaycastResult();
}
protected static MoveDirection DetermineMoveDirection(float x, float y)
{
return DetermineMoveDirection(x, y, 0.6f);
}
protected static MoveDirection DetermineMoveDirection(float x, float y, float deadZone)
{
// if vector is too small... just return
if (new Vector2(x, y).sqrMagnitude < deadZone * deadZone)
return MoveDirection.None;
if (Mathf.Abs(x) > Mathf.Abs(y))
{
if (x > 0)
return MoveDirection.Right;
return MoveDirection.Left;
}
else
{
if (y > 0)
return MoveDirection.Up;
return MoveDirection.Down;
}
}
protected static GameObject FindCommonRoot(GameObject g1, GameObject g2)
{
if (g1 == null || g2 == null)
return null;
var t1 = g1.transform;
while (t1 != null)
{
var t2 = g2.transform;
while (t2 != null)
{
if (t1 == t2)
return t1.gameObject;
t2 = t2.parent;
}
t1 = t1.parent;
}
return null;
}
// walk up the tree till a common root between the last entered and the current entered is foung
// send exit events up to (but not inluding) the common root. Then send enter events up to
// (but not including the common root).
protected void HandlePointerExitAndEnter(PointerEventData currentPointerData, GameObject newEnterTarget)
{
// if we have no target / pointerEnter has been deleted
// just send exit events to anything we are tracking
// then exit
if (newEnterTarget == null || currentPointerData.pointerEnter == null)
{
for (var i = 0; i < currentPointerData.hovered.Count; ++i)
ExecuteEvents.Execute(currentPointerData.hovered[i], currentPointerData, ExecuteEvents.pointerExitHandler);
currentPointerData.hovered.Clear();
if (newEnterTarget == null)
{
currentPointerData.pointerEnter = newEnterTarget;
return;
}
}
// if we have not changed hover target
if (currentPointerData.pointerEnter == newEnterTarget && newEnterTarget)
return;
GameObject commonRoot = FindCommonRoot(currentPointerData.pointerEnter, newEnterTarget);
// and we already an entered object from last time
if (currentPointerData.pointerEnter != null)
{
// send exit handler call to all elements in the chain
// until we reach the new target, or null!
Transform t = currentPointerData.pointerEnter.transform;
while (t != null)
{
// if we reach the common root break out!
if (commonRoot != null && commonRoot.transform == t)
break;
ExecuteEvents.Execute(t.gameObject, currentPointerData, ExecuteEvents.pointerExitHandler);
currentPointerData.hovered.Remove(t.gameObject);
t = t.parent;
}
}
// now issue the enter call up to but not including the common root
currentPointerData.pointerEnter = newEnterTarget;
if (newEnterTarget != null)
{
Transform t = newEnterTarget.transform;
while (t != null && t.gameObject != commonRoot)
{
ExecuteEvents.Execute(t.gameObject, currentPointerData, ExecuteEvents.pointerEnterHandler);
currentPointerData.hovered.Add(t.gameObject);
t = t.parent;
}
}
}
protected virtual AxisEventData GetAxisEventData(float x, float y, float moveDeadZone)
{
if (m_AxisEventData == null)
m_AxisEventData = new AxisEventData(eventSystem);
m_AxisEventData.Reset();
m_AxisEventData.moveVector = new Vector2(x, y);
m_AxisEventData.moveDir = DetermineMoveDirection(x, y, moveDeadZone);
return m_AxisEventData;
}
protected virtual BaseEventData GetBaseEventData()
{
if (m_BaseEventData == null)
m_BaseEventData = new BaseEventData(eventSystem);
m_BaseEventData.Reset();
return m_BaseEventData;
}
public virtual bool IsPointerOverGameObject(int pointerId)
{
return false;
}
public virtual bool ShouldActivateModule()
{
return enabled && gameObject.activeInHierarchy;
}
public virtual void DeactivateModule()
{}
public virtual void ActivateModule()
{}
// 模块更新入口，在这里里面调用Input检测事件
public virtual void UpdateModule()
{}
public virtual bool IsModuleSupported()
{
return true;
}
}
}
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