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Assets/BITKit/Unity/Scripts/UX/Library/TabBar.cs

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+using System;
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.UIElements;
+
+namespace BITKit.UX
+{
+	/// <summary>
+	/// Tab容器,仅用于快速生成TabBar
+	/// </summary>
+	[UnityEngine.Scripting.Preserve]
+	public class TabBar : VisualElement,INotifyValueChanged<int>
+	{
+		public new class UxmlTraits:VisualElement.UxmlTraits
+		{
+			private readonly UxmlIntAttributeDescription m_TabBarAttribute = new ()
+			{
+				name = "CurrentTab",
+				defaultValue = -1
+			};
+			private readonly UxmlStringAttributeDescription m_TabsAttribute = new ()
+			{
+				name = "tabs"
+			};
+			public override void Init(VisualElement ve, IUxmlAttributes bag, CreationContext cc)
+			{
+				base.Init(ve, bag, cc);
+				var tabBar = (TabBar)ve;
+				tabBar.CurrentTab = m_TabBarAttribute.GetValueFromBag(bag, cc);
+				tabBar.Tabs = m_TabsAttribute.GetValueFromBag(bag, cc);
+			}
+		}
+		public new class UxmlFactory : UxmlFactory<TabBar, UxmlTraits> { }
+		// These are USS class names for the control overall and the label.
+
+		public event Action<int> OnTabChanged; 
+		
+		private Button[] _buttons = Array.Empty<Button>();
+		private int _currentTab;
+		public int CurrentTab
+		{
+			get=>_currentTab;
+			set
+			{
+				_currentTab = value;
+				SetTabs(value);
+			}
+		}
+		
+		private string tabs;
+		public string Tabs
+		{
+			get => tabs;
+			set
+			{
+				tabs = value;
+				SetTabs(value);
+			}
+		}
+		private void SetTabs(string value)
+		{
+			var split = value.Split(",");
+			foreach (var x in _buttons)
+			{
+				x.RemoveFromHierarchy();
+			}
+			_buttons = new Button[split.Length];
+			for (var i = 0; i < split.Length; i++)
+			{
+				var tabName = split[i];
+				var index = i;
+				var button = _buttons[i] = this.Create<Button>();
+				button.text = tabName;
+				button.clicked += () => CurrentTab = index;
+			}
+		}
+
+		private void SetTabs(int index)
+		{
+			SetValueWithoutNotify(index);
+			OnTabChanged?.Invoke(index);
+			MarkDirtyRepaint();
+		}
+
+		public void SetValueWithoutNotify(int newValue)
+		{
+			switch (newValue)
+			{
+				case var _ when newValue < 0 || newValue > _buttons.Length:
+					return;
+			}
+			for (var i = 0; i < _buttons.Length; i++)
+			{
+				var button = _buttons[i];
+				var entry = newValue == i;
+				button.SetEnabled(!entry);
+			}
+		}
+        int INotifyValueChanged<int>.value
+		{
+			get => CurrentTab;
+			set=>CurrentTab = value;
+		}
+	}
+
+
+}