基础内容

必要插件安装
缓动曲线和动画基础
ElementFolder，Track与其次级模块，PathNode重构

Assets/Modern UI Pack/Scripts/Context Menu/ContextMenuSubMenu.cs

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+using System.Collections;
+using UnityEngine;
+using UnityEngine.UI;
+using UnityEngine.EventSystems;
+using TMPro;
+
+namespace Michsky.MUIP
+{
+    public class ContextMenuSubMenu : MonoBehaviour, IPointerClickHandler, IPointerEnterHandler, IPointerExitHandler
+    {
+        public ContextMenuManager cmManager;
+        public ContextMenuContent cmContent;
+        public Animator subMenuAnimator;
+        public Transform itemParent;
+        public GameObject trigger;
+        [HideInInspector] public int subMenuIndex;
+
+        GameObject selectedItem;
+        Image setItemImage;
+        TextMeshProUGUI setItemText;
+        Sprite imageHelper;
+        string textHelper;
+        RectTransform listParent;
+
+       [HideInInspector] public bool enableFadeOut = true;
+
+        void OnEnable()
+        {
+            if (itemParent == null) { Debug.Log("<b>[Context Menu]</b> Item Parent is missing.", this); return; }
+
+            listParent = itemParent.parent.gameObject.GetComponent<RectTransform>();
+        }
+
+        public void OnPointerClick(PointerEventData eventData)
+        {
+            if (cmManager.subMenuBehaviour == ContextMenuManager.SubMenuBehaviour.Click)
+            {
+                if (subMenuAnimator.GetCurrentAnimatorStateInfo(0).IsName("Menu In")) 
+                { 
+                    subMenuAnimator.Play("Menu Out");
+                    if (trigger != null) { trigger.SetActive(false); }
+                }
+
+                else 
+                { 
+                    subMenuAnimator.Play("Menu In"); 
+                    if (trigger != null) { trigger.SetActive(true); } 
+                }
+            }
+        }
+
+        public void OnPointerEnter(PointerEventData eventData)
+        {
+            foreach (Transform child in itemParent)
+                Destroy(child.gameObject);
+
+            for (int i = 0; i < cmContent.contexItems[subMenuIndex].subMenuItems.Count; ++i)
+            {
+                bool nulLVariable = false;
+
+                if (cmContent.contexItems[subMenuIndex].subMenuItems[i].contextItemType == ContextMenuContent.ContextItemType.Button && cmManager.contextButton != null)
+                    selectedItem = cmManager.contextButton;
+                else if (cmContent.contexItems[subMenuIndex].subMenuItems[i].contextItemType == ContextMenuContent.ContextItemType.Separator && cmManager.contextSeparator != null)
+                    selectedItem = cmManager.contextSeparator;
+                else
+                {
+                    Debug.LogError("<b>[Context Menu]</b> At least one of the item presets is missing. " +
+                        "You can assign a new variable in Resources (Context Menu) tab. All default presets can be found in " +
+                        "<b>Modern UI Pack > Prefabs > Context Menu</b> folder.", this);
+                    nulLVariable = true;
+                }
+
+                if (nulLVariable == false)
+                {
+                    GameObject go = Instantiate(selectedItem, new Vector3(0, 0, 0), Quaternion.identity) as GameObject;
+                    go.transform.SetParent(itemParent, false);
+
+                    if (cmContent.contexItems[subMenuIndex].subMenuItems[i].contextItemType == ContextMenuContent.ContextItemType.Button)
+                    {
+                        setItemText = go.GetComponentInChildren<TextMeshProUGUI>();
+                        textHelper = cmContent.contexItems[subMenuIndex].subMenuItems[i].itemText;
+                        setItemText.text = textHelper;
+
+                        Transform goImage = go.gameObject.transform.Find("Icon");
+                        setItemImage = goImage.GetComponent<Image>();
+                        imageHelper = cmContent.contexItems[subMenuIndex].subMenuItems[i].itemIcon;
+                        setItemImage.sprite = imageHelper;
+
+                        if (imageHelper == null)
+                            setItemImage.color = new Color(0, 0, 0, 0);
+
+                        Button itemButton = go.GetComponent<Button>();
+                        itemButton.onClick.AddListener(cmContent.contexItems[subMenuIndex].subMenuItems[i].onClick.Invoke);
+                        itemButton.onClick.AddListener(CloseOnClick);
+                        StartCoroutine(ExecuteAfterTime(0.01f));
+                    }
+                }
+            }
+
+            if (cmManager.autoSubMenuPosition == true)
+            {
+                if (cmManager.horizontalBound == ContextMenuManager.CursorBoundHorizontal.Left) { listParent.pivot = new Vector2(0f, listParent.pivot.y); }
+                else if (cmManager.horizontalBound == ContextMenuManager.CursorBoundHorizontal.Right) { listParent.pivot = new Vector2(1f, listParent.pivot.y); }
+               
+                if (cmManager.verticalBound == ContextMenuManager.CursorBoundVertical.Top) { listParent.pivot = new Vector2(listParent.pivot.x, 0f); }
+                else if (cmManager.verticalBound == ContextMenuManager.CursorBoundVertical.Bottom) { listParent.pivot = new Vector2(listParent.pivot.x, 1f); }
+            }
+
+            if (cmManager.subMenuBehaviour == ContextMenuManager.SubMenuBehaviour.Hover)
+                subMenuAnimator.Play("Menu In");
+        }
+
+        public void OnPointerExit(PointerEventData eventData)
+        {
+#if !UNITY_2022_1_OR_NEWER
+            if (cmManager.subMenuBehaviour == ContextMenuManager.SubMenuBehaviour.Hover && !subMenuAnimator.GetCurrentAnimatorStateInfo(0).IsName("Start"))
+                subMenuAnimator.Play("Menu Out");
+#endif
+        }
+
+        IEnumerator ExecuteAfterTime(float time)
+        {
+            yield return new WaitForSecondsRealtime(time);
+            itemParent.gameObject.SetActive(false);
+            itemParent.gameObject.SetActive(true);
+            StopCoroutine(ExecuteAfterTime(0.01f));
+            StopCoroutine("ExecuteAfterTime");
+        }
+
+        public void CloseOnClick()
+        {
+            cmManager.contextAnimator.Play("Menu Out");
+            cmManager.isOn = false;
+            trigger.SetActive(false);
+        }
+    }
+}