diff options
Diffstat (limited to 'Assets/uGUI-2017.1/UnityEngine.UI/EventSystem/EventHandler/EventSystem.cs')
| -rw-r--r-- | Assets/uGUI-2017.1/UnityEngine.UI/EventSystem/EventHandler/EventSystem.cs | 328 |
1 files changed, 328 insertions, 0 deletions
diff --git a/Assets/uGUI-2017.1/UnityEngine.UI/EventSystem/EventHandler/EventSystem.cs b/Assets/uGUI-2017.1/UnityEngine.UI/EventSystem/EventHandler/EventSystem.cs new file mode 100644 index 0000000..1440547 --- /dev/null +++ b/Assets/uGUI-2017.1/UnityEngine.UI/EventSystem/EventHandler/EventSystem.cs @@ -0,0 +1,328 @@ +using System; +using System.Collections.Generic; +using System.Text; +using UnityEngine; +using UnityEngine.Serialization; + +namespace UnityEngine.EventSystems +{ + [AddComponentMenu("Event/Event System")] + public class EventSystem : UIBehaviour + { + // 获得当前EventSystem挂着的BaseInputModule的派生类，一般来说只会挂一个StandableInputModule + private List<BaseInputModule> m_SystemInputModules = new List<BaseInputModule>(); + + private BaseInputModule m_CurrentInputModule; + + public static EventSystem current { get; set; } + + [SerializeField] + [FormerlySerializedAs("m_Selected")] + private GameObject m_FirstSelected; + + [SerializeField] + private bool m_sendNavigationEvents = true; // Should the EventSystem allow navigation events (move / submit / cancel). + + public bool sendNavigationEvents + { + get { return m_sendNavigationEvents; } + set { m_sendNavigationEvents = value; } + } + + [SerializeField] + private int m_DragThreshold = 5; + public int pixelDragThreshold + { + get { return m_DragThreshold; } + set { m_DragThreshold = value; } + } + + private GameObject m_CurrentSelected; + + public BaseInputModule currentInputModule + { + get { return m_CurrentInputModule; } + } + + /// <summary> + /// Only one object can be selected at a time. Think: controller-selected button. + /// </summary> + public GameObject firstSelectedGameObject + { + get { return m_FirstSelected; } + set { m_FirstSelected = value; } + } + + public GameObject currentSelectedGameObject + { + get { return m_CurrentSelected; } + } + + [Obsolete("lastSelectedGameObject is no longer supported")] + public GameObject lastSelectedGameObject + { + get { return null; } + } + + private bool m_HasFocus = true; + + public bool isFocused + { + get { return m_HasFocus; } + } + + protected EventSystem() + {} + + //c 把挂着的input modules加入m_SystemInputModules + public void UpdateModules() + { + // 拿到当前EventSystem下面挂着的inputmodule,通常来说只会挂一个standaloneInputModule + GetComponents(m_SystemInputModules); + for (int i = m_SystemInputModules.Count - 1; i >= 0; i--) + { + if (m_SystemInputModules[i] && m_SystemInputModules[i].IsActive()) + continue; + m_SystemInputModules.RemoveAt(i); + } + } + + private bool m_SelectionGuard; + public bool alreadySelecting + { + get { return m_SelectionGuard; } + } + + public void SetSelectedGameObject(GameObject selected, BaseEventData pointer) + { + if (m_SelectionGuard) + { + Debug.LogError("Attempting to select " + selected + "while already selecting an object."); + return; + } + + m_SelectionGuard = true; + if (selected == m_CurrentSelected) + { + m_SelectionGuard = false; + return; + } + + // Debug.Log("Selection: new (" + selected + ") old (" + m_CurrentSelected + ")"); + ExecuteEvents.Execute(m_CurrentSelected, pointer, ExecuteEvents.deselectHandler); + m_CurrentSelected = selected; + ExecuteEvents.Execute(m_CurrentSelected, pointer, ExecuteEvents.selectHandler); + m_SelectionGuard = false; + } + + private BaseEventData m_DummyData; + private BaseEventData baseEventDataCache + { + get + { + if (m_DummyData == null) + m_DummyData = new BaseEventData(this); + + return m_DummyData; + } + } + + public void SetSelectedGameObject(GameObject selected) + { + SetSelectedGameObject(selected, baseEventDataCache); + } + + private static int RaycastComparer(RaycastResult lhs, RaycastResult rhs) + { + if (lhs.module != rhs.module) + { + var lhsEventCamera = lhs.module.eventCamera; + var rhsEventCamera = rhs.module.eventCamera; + if (lhsEventCamera != null && rhsEventCamera != null && lhsEventCamera.depth != rhsEventCamera.depth) + { + // need to reverse the standard compareTo + if (lhsEventCamera.depth < rhsEventCamera.depth) + return 1; + if (lhsEventCamera.depth == rhsEventCamera.depth) + return 0; + + return -1; + } + + if (lhs.module.sortOrderPriority != rhs.module.sortOrderPriority) + return rhs.module.sortOrderPriority.CompareTo(lhs.module.sortOrderPriority); + + if (lhs.module.renderOrderPriority != rhs.module.renderOrderPriority) + return rhs.module.renderOrderPriority.CompareTo(lhs.module.renderOrderPriority); + } + + if (lhs.sortingLayer != rhs.sortingLayer) + { + // Uses the layer value to properly compare the relative order of the layers. + var rid = SortingLayer.GetLayerValueFromID(rhs.sortingLayer); + var lid = SortingLayer.GetLayerValueFromID(lhs.sortingLayer); + return rid.CompareTo(lid); + } + + + if (lhs.sortingOrder != rhs.sortingOrder) + return rhs.sortingOrder.CompareTo(lhs.sortingOrder); + + if (lhs.depth != rhs.depth) + return rhs.depth.CompareTo(lhs.depth); + + if (lhs.distance != rhs.distance) + return lhs.distance.CompareTo(rhs.distance); + + return lhs.index.CompareTo(rhs.index); + }
+
+ #region 射线检测 +
+ private static readonly Comparison<RaycastResult> s_RaycastComparer = RaycastComparer; + + // 从PointerInputModule.GetTouchPointerEventData()来的触摸数据 + public void RaycastAll(PointerEventData eventData, List<RaycastResult> raycastResults) + { + raycastResults.Clear(); + //包括场景中所有的raycaster + var modules = RaycasterManager.GetRaycasters(); + for (int i = 0; i < modules.Count; ++i) + { + var module = modules[i]; + if (module == null || !module.IsActive()) + continue; + + module.Raycast(eventData, raycastResults); + } + + raycastResults.Sort(s_RaycastComparer); + }
+
+ #endregion +
+ //c 是否点击到某个物体
+ public bool IsPointerOverGameObject() + { + return IsPointerOverGameObject(PointerInputModule.kMouseLeftId); + } + + //c 是否点击到某个物体 + public bool IsPointerOverGameObject(int pointerId) + { + if (m_CurrentInputModule == null) + return false; + + return m_CurrentInputModule.IsPointerOverGameObject(pointerId); + } + + protected override void OnEnable() + { + base.OnEnable(); + if (EventSystem.current == null) + EventSystem.current = this; +#if UNITY_EDITOR + else + { + Debug.LogWarning("Multiple EventSystems in scene... this is not supported"); + } +#endif + } + + protected override void OnDisable() + { + if (m_CurrentInputModule != null) + { + m_CurrentInputModule.DeactivateModule(); + m_CurrentInputModule = null; + } + + if (EventSystem.current == this) + EventSystem.current = null; + + base.OnDisable(); + } + + protected virtual void OnApplicationFocus(bool hasFocus) + { + m_HasFocus = hasFocus; + } + + private void TickModules() + { + // 只有standaloneInputModule一个 + for (var i = 0; i < m_SystemInputModules.Count; i++) + { + if (m_SystemInputModules[i] != null) + m_SystemInputModules[i].UpdateModule(); + } + } + + //c 事件处理跑在一个update里，以轮训的方式检测输入 + protected virtual void Update() + { + if (current != this) + return; + + // 只更新鼠标位置 + TickModules(); + + // 将m_CurrentInputModule设置为m_SystemInputModules第一个可用的module + bool changedModule = false; + for (var i = 0; i < m_SystemInputModules.Count; i++) + { + var module = m_SystemInputModules[i]; + if (module.IsModuleSupported() && module.ShouldActivateModule()) + { + if (m_CurrentInputModule != module) + { + ChangeEventModule(module); + changedModule = true; + } + break; + } + } + // no event module set... set the first valid one... + if (m_CurrentInputModule == null) + { + for (var i = 0; i < m_SystemInputModules.Count; i++) + { + var module = m_SystemInputModules[i]; + if (module.IsModuleSupported()) + { + ChangeEventModule(module); + changedModule = true; + break; + } + } + } + + //c! 执行事件处理主入口，通常情况下，如果没有自定义的inputModule，就是走StandaloneInputModule的Process + if (!changedModule && m_CurrentInputModule != null) + m_CurrentInputModule.Process(); + } + + private void ChangeEventModule(BaseInputModule module) + { + if (m_CurrentInputModule == module) + return; + + if (m_CurrentInputModule != null) + m_CurrentInputModule.DeactivateModule(); + + if (module != null) + module.ActivateModule(); + m_CurrentInputModule = module; + } + + public override string ToString() + { + var sb = new StringBuilder(); + sb.AppendLine("<b>Selected:</b>" + currentSelectedGameObject); + sb.AppendLine(); + sb.AppendLine(); + sb.AppendLine(m_CurrentInputModule != null ? m_CurrentInputModule.ToString() : "No module"); + return sb.ToString(); + } + } +} |