AlicizaX/Client/Packages/com.alicizax.uxtool/Editor/UXGUI/SceneView/PrefabTab/PrefabSingleTab.cs

#if UNITY_EDITOR
using UnityEditor;
using UnityEngine.UIElements;
using System.IO;
using UnityEngine;
using System;

namespace AlicizaX.UXTool
{
    public class PrefabSingleTab : VisualElement
    {
        public Button visual;
        private string m_guid;
        private static int m_maxwidth = PrefabTabs.m_maxWidth;
        private static int m_minwidth = PrefabTabs.m_minWidth;
        private static int m_maxcharacters = PrefabTabs.m_maxCharacters;
        private static int m_mincharacters = PrefabTabs.m_minCharacters;

        public PrefabSingleTab(FileInfo info, string guid, int prefabcounts, bool isclose, int width)
        {
            // 计算每个 tab 的推荐宽度（防空）
            SceneView sceneView = SceneView.lastActiveSceneView;
            int prewidth = 100;
            if (sceneView != null && prefabcounts > 0)
            {
                prewidth = Mathf.Max(1, (int)sceneView.position.width / Math.Max(1, prefabcounts));
            }

            // 根 Button（用于作为 tab 容器并响应 click）
            visual = new Button();
            visual.name = "Tab";

            // 基本样式（尽量还原 UXML 的样式）
            visual.style.height = 20;
            visual.style.flexDirection = FlexDirection.Row;
            visual.style.alignItems = Align.Center;
            visual.style.justifyContent = Justify.FlexStart;
            visual.style.unityTextAlign = TextAnchor.MiddleCenter;
            visual.style.backgroundColor = new StyleColor(new Color(60f / 255f, 60f / 255f, 60f / 255f, 1f));
            // margin、padding、border 等默认即可

            // Label
            Label label = new Label();
            label.name = "Label";
            label.style.paddingLeft = 5;
            label.style.whiteSpace = WhiteSpace.NoWrap;
            label.style.unityTextAlign = TextAnchor.MiddleCenter;
            label.style.alignSelf = Align.Center;
            // label 默认宽度稍后设置为 nowwidth

            // 关闭按钮
            Button close = new Button();
            close.name = "Close";
            close.style.width = 20;
            close.style.height = 20;
            close.style.alignSelf = Align.Center;
            close.style.marginLeft = 3;
            close.style.marginRight = 3;

            close.style.backgroundImage = new StyleBackground(EditorGUIUtility.IconContent("d_winbtn_mac_close_a").image as Texture2D);
            close.style.backgroundSize = new BackgroundSize(new Length(80, LengthUnit.Percent), new Length(80, LengthUnit.Percent));
            close.style.backgroundColor = Color.clear;
            close.style.borderLeftWidth = 0;
            close.style.borderRightWidth = 0;

            visual.Add(label);
            visual.Add(close);

            int nowwidth = m_maxwidth;
            if (isclose)
            {
                label.style.width = width;
                nowwidth = width;
            }
            else
            {
                int computed = Math.Min(Math.Max(m_minwidth, prewidth), m_maxwidth);
                label.style.width = computed;
                nowwidth = computed;
            }

            int nowCharacterscounts = m_maxcharacters;
            if (nowwidth < m_maxwidth)
                nowCharacterscounts = Math.Max(m_maxcharacters - (int)((m_maxwidth - nowwidth) / 10), m_mincharacters);

            m_guid = guid;
            string fileName = Path.GetFileNameWithoutExtension(info.Name);
            label.text = SetTextWithEllipsis(nowCharacterscounts, fileName);

            // 事件绑定（与原逻辑一致）
            close.clickable.activators.Add(new ManipulatorActivationFilter { button = MouseButton.LeftMouse });
            close.clicked += OnClose;
            close.RegisterCallback<MouseEnterEvent, VisualElement>(OnHoverClose, close);
            close.RegisterCallback<MouseLeaveEvent, VisualElement>(OnHoverClose, close);

            visual.RegisterCallback<MouseEnterEvent>(OnHoverChange);
            visual.RegisterCallback<MouseLeaveEvent>(OnHoverChange);

            visual.clickable.activators.Add(new ManipulatorActivationFilter { button = MouseButton.LeftMouse });
            visual.clicked += OnClick;
            visual.RegisterCallback<MouseDownEvent>(Callback);

            // 将 visual 作为当前元素的一部分（方便外部访问 this.visual）
            this.Add(visual);
        }

        private void Callback(MouseDownEvent e)
        {
            if (e.button == 1)
            {
                ContextMenuUtils.Menu.BuildPrefabTabMenuItem(m_guid);
                ContextMenuUtils.ShowContextMenu();
            }
        }

        private void OnHoverChange(EventBase e)
        {
            if (m_guid == PrefabTabs.SelectedGuid) return;
            if (e.eventTypeId == MouseEnterEvent.TypeId())
            {
                visual.style.backgroundColor = new StyleColor(new Color(78f / 255f, 78f / 255f, 78f / 255f, 1f));
            }
            else if (e.eventTypeId == MouseLeaveEvent.TypeId())
            {
                visual.style.backgroundColor = new StyleColor(new Color(60f / 255f, 60f / 255f, 60f / 255f, 1f));
            }
        }

        private void OnHoverClose(EventBase e, VisualElement close)
        {
            // if (e.eventTypeId == MouseEnterEvent.TypeId())
            // {
            //     close.style.backgroundColor = new StyleColor(new Color(60f / 255f, 60f / 255f, 60f / 255f, 1f));
            // }
            // else if (e.eventTypeId == MouseLeaveEvent.TypeId())
            // {
            //     close.style.backgroundColor = new StyleColor(new Color(60f / 255f, 60f / 255f, 60f / 255f, 0f));
            // }
        }

        private void OnClick()
        {
            PrefabTabs.OpenTab(m_guid, true);
        }

        private void OnClose()
        {
            PrefabTabs.CloseTab(m_guid);
        }

        private string SetTextWithEllipsis(int count, string name)
        {
            if (name.Length <= count)
            {
                return name;
            }
            else
            {
                string ans = name.Substring(0, Math.Max(0, count - 3));
                ans += "...";
                return ans;
            }
        }
    }
}
#endif