UIContextMenuPopper.cs

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using System;
using UnityEngine;
using UnityEngine.EventSystems;
 
public class UIContextMenuPopper : UIContextMenuItem, IPointerEnterHandler, IEventSystemHandler, IPointerExitHandler
{
    [NonSerialized]
    public RectTransform _rect;
 
    [NonSerialized]
    public bool isPointerOver;
 
    [NonSerialized]
    public UIContextMenu parent;
 
    [NonSerialized]
    public string id;
 
    public UIContextMenu menu;
 
    public UIContextMenu defaultMenu;
 
    public Vector2 margin = new Vector2(8f, 10f);
 
    public float bottomFix;
 
    private void Awake()
    {
        _rect = base.transform as RectTransform;
    }
 
    public virtual void OnPointerEnter(PointerEventData data)
    {
        isPointerOver = true;
    }
 
    public virtual void OnPointerExit(PointerEventData data)
    {
        isPointerOver = false;
    }
 
    private void Update()
    {
        if (isPointerOver && !menu.gameObject.activeSelf && parent.timeSinceOpen > 0.1f && !Input.GetMouseButton(0))
        {
            Pop();
        }
        if (!isPointerOver && !Input.GetMouseButton(0) && UIContextMenu.Current.hideOnMouseLeave && !menu.isPointerOver)
        {
            Depop();
        }
    }
 
    public void Pop()
    {
        if (!UIContextMenu.Current.hideOnMouseLeave)
        {
            UIContextMenuPopper[] componentsInChildren = UIContextMenu.Current.GetComponentsInChildren<UIContextMenuPopper>();
            for (int i = 0; i < componentsInChildren.Length; i++)
            {
                componentsInChildren[i].Depop();
            }
        }
        if (menu == null)
        {
            CreateMenu();
        }
        menu.Show();
        if (parent != null)
        {
            PositionMenu();
        }
    }
 
    public void Depop()
    {
        menu.Hide();
    }
 
    public UIContextMenu CreateMenu()
    {
        menu = UnityEngine.Object.Instantiate(defaultMenu);
        menu.transform.SetParent(base.transform, worldPositionStays: false);
        menu.popper = this;
        menu.depth = parent.depth + 1;
        menu.parent = parent;
        if (parent.system)
        {
            menu.bg.material = parent.matBlur;
        }
        return menu;
    }
 
    public void PositionMenu()
    {
        RectTransform rect = menu._rect;
        rect.RebuildLayout(recursive: true);
        Vector2 zero = Vector2.zero;
        zero.x = _rect.sizeDelta.x - margin.x;
        zero.y = _rect.sizeDelta.y * -1f - margin.y;
        rect.pivot = new Vector2(0f, 1f);
        rect.anchoredPosition = zero;
        if (parent.transform.position.x + parent._rect.sizeDelta.x * (1f - parent._rect.pivot.x) > (float)Screen.width - rect.sizeDelta.x || menu.alwaysPopLeft)
        {
            zero.x = margin.x;
            rect.pivot = new Vector2(1f, menu._rect.pivot.y);
        }
        zero.x = (int)zero.x;
        zero.y = (int)zero.y;
        rect.anchoredPosition = zero;
        if (rect.position.y - rect.sizeDelta.y * BaseCore.Instance.uiScale < 0f)
        {
            Vector3 position = rect.position;
            position.y = rect.sizeDelta.y * BaseCore.Instance.uiScale;
            rect.position = position;
        }
    }
}