279 lines
8.4 KiB
C#
279 lines
8.4 KiB
C#
using UnityEngine;
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using UnityEngine.EventSystems;
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using UnityEngine.UI;
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namespace XericLibrary.Runtime.Blueprint
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{
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/// <summary>
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/// 蓝图输入工具基类（UGUI）—— 注册 EventTrigger 到蓝图背景上监听鼠标事件，
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/// 并将事件发布到 <see cref="BlueprintToolProvider"/>，同时记录光标上下文。
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/// <para>
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/// 注意：此基类本身不被注册为独立工具（无 <c>[BlueprintTool]</c> 属性）。
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/// 由子类 <c>BlueprintInputTool_InputSystem</c> 和 <c>BlueprintInputTool_InputManager</c>
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/// 通过继承获得 UGUI 绑定能力。
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/// </para>
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/// </summary>
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public class BlueprintInputTool_UGUI : GraphInputTool
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{
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// ===== EventTrigger 绑定 =====
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private Transform _bgTransform;
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private EventTrigger _eventTrigger;
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private RectTransform _bgRectTransform;
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private const string BackgroundGoName = "__Bp_GridBackground";
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// 上一帧的鼠标画布坐标（用于计算 PointerMove delta）
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private Vector2 _lastCanvasPos;
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/// <summary>
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/// 是否通过 EventTrigger 处理鼠标按键/拖拽/滚轮事件。
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/// 新输入系统路径下为 true（默认），旧输入系统路径下为 false（由 PollUpdate 轮询）。
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/// 子类可在 <see cref="OnInitialize"/> 中修改此值。
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/// </summary>
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protected bool UseEventTriggerForMouse { get; set; } = true;
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// ===== 生命周期 =====
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public override void OnInitialize()
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{
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TryBindEventTrigger();
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}
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public override void OnUpdate(float deltaTime)
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{
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if (Graph == null) return;
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// 检查底层的 Unity Canvas 组件是否仍存活
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// Graph?.Canvas 是 C# 接口引用（非 Unity Object），不适用 Unity 的假空检测
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if (Graph.Canvas == null || !Graph.Canvas.IsAlive)
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return;
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Graph.BeginFrame();
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BlueprintUGUIInputManager.UpdateMousePosition();
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BlueprintToolProvider.MousePosition = BlueprintUGUIInputManager.MousePosition;
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// 每帧检查 EventTrigger 是否有效（应对 Editor 重收集工具场景）
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if (_eventTrigger == null || !IsEventTriggerValid())
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{
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_eventTrigger = null; // 强制重新绑定
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TryBindEventTrigger();
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return;
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}
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var canvasPt = Graph.Canvas != null
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? Graph.Canvas.ScreenToCanvas(BlueprintUGUIInputManager.MousePosition)
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: Vector2.zero;
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UpdateCursorContext(canvasPt);
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// ── 每帧分发 PointerMove ──
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var delta = canvasPt - _lastCanvasPos;
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if (delta.sqrMagnitude > 0.0001f || _lastCanvasPos == Vector2.zero)
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{
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BlueprintToolProvider.DispatchPointerMove(Graph, this, canvasPt, delta);
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}
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_lastCanvasPos = canvasPt;
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}
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/// <summary>
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/// 检查已绑定的 EventTrigger 实例是否仍然有效（回调仍指向本实例）。
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/// </summary>
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private bool IsEventTriggerValid()
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{
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if (_eventTrigger == null) return false;
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var triggersList = _eventTrigger.triggers;
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if (triggersList == null || triggersList.Count == 0) return false;
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var callbacks = triggersList[0].callback;
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if (callbacks == null) return false;
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int persistentCount = callbacks.GetPersistentEventCount();
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if (persistentCount > 0)
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{
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var target = callbacks.GetPersistentTarget(0);
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return target != null && target.Equals(this);
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}
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return true;
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}
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public override void OnDestroy()
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{
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UnbindEventTrigger();
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}
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/// <summary>
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/// 确保场景中存在 EventSystem 和合适的 InputModule。
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/// 旧输入系统 → StandaloneInputModule。
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/// 新输入系统 → InputSystemUIInputModule（由 GraphTheoryBlueprintComponent 创建）。
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/// 不会重复创建模块（通过 GetComponent 检查）。
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/// </summary>
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private static void EnsureEventSystemExists()
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{
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var es = Object.FindObjectOfType<EventSystem>();
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if (es == null)
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{
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var go = new GameObject("EventSystem");
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es = go.AddComponent<EventSystem>();
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}
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#if !ENABLE_INPUT_SYSTEM
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if (es.GetComponent<StandaloneInputModule>() == null)
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{
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es.gameObject.AddComponent<StandaloneInputModule>();
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}
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#endif
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}
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// ===== EventTrigger 绑定/解绑 =====
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private void TryBindEventTrigger()
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{
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if (_eventTrigger != null) return;
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if (Graph?.Canvas == null || !Graph.Canvas.IsAlive) return;
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var root = Graph.Canvas.GetRootTransform();
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if (root == null) return;
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_bgTransform = root.Find(BackgroundGoName);
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if (_bgTransform == null) return;
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_bgRectTransform = _bgTransform as RectTransform;
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// ── 自动创建 EventSystem（含合适 InputModule）──
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EnsureEventSystemExists();
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_eventTrigger = _bgTransform.gameObject.GetComponent<EventTrigger>();
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if (_eventTrigger == null)
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{
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_eventTrigger = _bgTransform.gameObject.AddComponent<EventTrigger>();
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}
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else
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_eventTrigger.triggers.Clear();
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BindAllEntries();
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}
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private void UnbindEventTrigger()
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{
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if (_eventTrigger != null)
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{
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_eventTrigger.triggers.Clear();
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_eventTrigger = null;
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}
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_bgTransform = null;
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_bgRectTransform = null;
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}
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private void BindAllEntries()
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{
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if (_eventTrigger == null) return;
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// ── 始终绑定的基础回调（指针进入/离开） ──
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AddEntry(EventTriggerType.PointerEnter, OnPointerEnterEvent);
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AddEntry(EventTriggerType.PointerExit, OnPointerExitEvent);
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// ── 鼠标按键/拖拽/滚轮（仅在 UseEventTriggerForMouse 时绑定） ──
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if (UseEventTriggerForMouse)
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{
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AddEntry(EventTriggerType.PointerDown, OnPointerDownEvent);
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AddEntry(EventTriggerType.PointerUp, OnPointerUpEvent);
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AddEntry(EventTriggerType.BeginDrag, OnBeginDragEvent);
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AddEntry(EventTriggerType.Drag, OnDragEvent);
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AddEntry(EventTriggerType.EndDrag, OnEndDragEvent);
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AddEntry(EventTriggerType.Scroll, OnScrollEvent);
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}
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}
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private void AddEntry(EventTriggerType type, UnityEngine.Events.UnityAction<BaseEventData> callback)
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{
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var entry = new EventTrigger.Entry { eventID = type };
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entry.callback.AddListener(callback);
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_eventTrigger.triggers.Add(entry);
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}
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// ===== 坐标转换 =====
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private Vector2 ScreenToCanvas(Vector2 screenPos)
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{
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return Graph?.Canvas != null ? Graph.Canvas.ScreenToCanvas(screenPos) : screenPos;
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}
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private Vector2 PointerCanvasPos(PointerEventData data)
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{
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return ScreenToCanvas(data.position);
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}
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// ===== EventTrigger 回调（以 self 作为 sender 派发） =====
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private void OnPointerEnterEvent(BaseEventData _)
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{
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BlueprintToolProvider.DispatchPointerEnter(Graph, this);
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}
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private void OnPointerExitEvent(BaseEventData _)
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{
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BlueprintToolProvider.DispatchPointerExit(Graph, this);
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}
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private void OnPointerDownEvent(BaseEventData data)
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{
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if (!(data is PointerEventData pData)) return;
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var pt = PointerCanvasPos(pData);
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Graph?.MarkDirty();
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UpdateCursorContext(pt);
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BlueprintToolProvider.DispatchPointerDown(Graph, this, pt, (int)pData.button);
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}
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private void OnPointerUpEvent(BaseEventData data)
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{
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if (!(data is PointerEventData pData)) return;
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var pt = PointerCanvasPos(pData);
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UpdateCursorContext(pt);
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// 有拖拽的释放由 OnEndDragEvent 处理，这里只响应无拖拽的点击释放
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if (!_hadDragThisClick)
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{
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bool isEmptyClick = Graph?.HitTest(pt) == null;
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BlueprintToolProvider.DispatchPointerUp(Graph, this, pt, (int)pData.button, isEmptyClick);
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}
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}
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private Vector2 _dragStartPos;
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private bool _hadDragThisClick;
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private void OnBeginDragEvent(BaseEventData data)
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{
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if (!(data is PointerEventData pData)) return;
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_dragStartPos = PointerCanvasPos(pData);
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_hadDragThisClick = true;
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}
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private void OnDragEvent(BaseEventData data)
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{
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if (!(data is PointerEventData pData)) return;
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var current = PointerCanvasPos(pData);
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var delta = current - _dragStartPos;
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_dragStartPos = current;
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UpdateCursorContext(current);
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BlueprintToolProvider.DispatchPointerDrag(Graph, this, current, delta, (int)pData.button);
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}
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private void OnEndDragEvent(BaseEventData data)
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{
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if (!(data is PointerEventData pData)) return;
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var pt = PointerCanvasPos(pData);
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UpdateCursorContext(pt);
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BlueprintToolProvider.DispatchPointerUp(Graph, this, pt, (int)pData.button);
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}
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private void OnScrollEvent(BaseEventData data)
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{
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if (!(data is PointerEventData pData)) return;
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var pt = PointerCanvasPos(pData);
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var scroll = new Vector2(-pData.scrollDelta.x, -pData.scrollDelta.y);
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UpdateCursorContext(pt);
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Graph?.MarkDirty();
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BlueprintToolProvider.DispatchScroll(Graph, this, pt, scroll);
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}
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}
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}
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