WIP

UXAssist/UI/MyComboBox.cs

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+using System;
+using System.Linq;
+using UnityEngine;
+
+namespace UXAssist.UI;
+
+public class MyComboBox : MonoBehaviour
+{
+    private RectTransform _rectTrans;
+    private UIComboBox _comboBox;
+    private Action<int> _onSelChanged;
+
+    private static GameObject _baseObject;
+
+    public static MyComboBox CreateComboBox(float x, float y, RectTransform parent)
+    {
+        if (!_baseObject)
+        {
+            var go = Instantiate(UIRoot.instance.optionWindow.resolutionComp.transform.parent.gameObject);
+            go.name = "my-combobox";
+            var rect = (RectTransform)go.transform;
+            var cbctrl = rect.transform.Find("ComboBox");
+            var content = cbctrl.Find("Dropdown List ScrollBox")?.Find("Mask")?.Find("Content Panel");
+            if (content != null)
+            {
+                for (var i = content.childCount - 1; i >= 0; i--)
+                {
+                    var theTrans = content.GetChild(i);
+                    if (theTrans.name == "Item Button(Clone)")
+                    {
+                        Destroy(theTrans.gameObject);
+                    }
+                }
+            }
+            var comboBox = cbctrl.GetComponent<UIComboBox>();
+            comboBox.onSubmit.RemoveAllListeners();
+            comboBox.onItemIndexChange.RemoveAllListeners();
+            _baseObject = go;
+        }
+        var gameObject = Instantiate(_baseObject);
+        gameObject.name = "my-combobox";
+        var cb = gameObject.AddComponent<MyComboBox>();
+        var rtrans = Util.NormalizeRectWithTopLeft(cb, x, y, parent);
+        cb._rectTrans = rtrans;
+            
+        var box = rtrans.transform.Find("ComboBox").GetComponent<UIComboBox>();
+        cb._comboBox = box;
+        box.onItemIndexChange.AddListener(() => { cb._onSelChanged?.Invoke(box.itemIndex); });
+
+        return cb;
+    }
+    
+    public MyComboBox SetItems(string[] items)
+    {
+        _comboBox.Items = items.ToList();
+        return this;
+    }
+    
+    public MyComboBox SetIndex(int index)
+    {
+        _comboBox.itemIndex = index;
+        return this;
+    }
+    
+    public MyComboBox AddOnSelChanged(Action<int> action)
+    {
+        _onSelChanged += action;
+        return this;
+    }
+
+    public MyComboBox SetSize(float width, float height)
+    {
+        _rectTrans.sizeDelta = new Vector2(width, height);
+        return this;
+    }
+}