Improve skill slot hover state robustness

Enhances UI stability by ensuring skill slot hover states are safely cleared during panel transitions, slot movement, and drag operations, preventing tooltip artifacts and potential null reference issues for a smoother user experience.

Author: hocha113

Content/LegendWeapon/HalibutLegend/UI/HalibutUI.cs

@@ -505,6 +505,11 @@ public override void Update() {
 
             Sengs = Math.Clamp(Sengs, 0f, 1f);
 
+            //面板关闭时兜底清除悬停状态
+            if (Sengs <= 0f) {
+                SkillSlot.ClearHoveredState();
+            }
+
             Size = Panel.Size();
             int leftWeith = (int)(20 - 200 * (1f - Sengs));
             int topHeight = (int)Size.Y;
@@ -563,6 +568,10 @@ public override void Update() {
                     anySlotHovered = true;
                 }
             }
+            //兜底：如果HoveredSlot引用了不在主面板列表中的槽位，强制清除
+            if (SkillSlot.HoveredSlot != null && !halibutUISkillSlots.Contains(SkillSlot.HoveredSlot)) {
+                SkillSlot.ClearHoveredState();
+            }
             if (!anySlotHovered) {
                 SkillTooltipPanel.Instance.Hide();//如果没有槽位被悬停，隐藏介绍面板（带延迟）
             }
@@ -574,7 +583,7 @@ public override void Update() {
                 draggingSlot.DrawPosition = new Vector2(dragVisualX, MathHelper.Lerp(draggingSlot.DrawPosition.Y, mouse.Y, 0.5f));
 
                 //拖拽时清除悬停状态，防止提示窗口残留
-                SkillSlot.HoveredSlot = null;
+                SkillSlot.ClearHoveredState();
                 SkillTooltipPanel.Instance.ForceHide();
 
                 //检测是否悬停在技能库区域，设置高亮
@@ -667,9 +676,10 @@ public void MoveSlotToFront(SkillSlot slot) {
             }
             halibutUISkillSlots.RemoveAt(idx);
             halibutUISkillSlots.Insert(0, slot);
-            //重新设置出现动画：被移动的放大闪动
+            //重新设置出现动画：被移动的放大闪动（动画期间不响应悬停）
             slot.appearProgress = 0f;
             slot.isAppearing = true;
+            SkillSlot.ClearHoveredState();
             //为了视觉平滑, 将滚动偏移重置到0并快速过渡
             scrollOffset = 0;
             //辅以轻微提示音

Content/LegendWeapon/HalibutLegend/UI/SkillLibraryUI.cs

@@ -321,6 +321,11 @@ public void MoveToLibrary(SkillSlot slot) {
                 return;
             }
 
+            //移除前清除悬停状态，避免引用悬空
+            if (SkillSlot.HoveredSlot == slot) {
+                SkillSlot.ClearHoveredState();
+            }
+
             mainSlots.Remove(slot);
             LibrarySlots.Add(slot);
 
@@ -346,6 +351,11 @@ public void MoveToLibraryWithAnimation(SkillSlot slot, Vector2 startPosition) {
                 return;
             }
 
+            //移除前清除悬停状态，避免引用悬空
+            if (SkillSlot.HoveredSlot == slot) {
+                SkillSlot.ClearHoveredState();
+            }
+
             mainSlots.Remove(slot);
 
             //计算目标位置（技能库中的位置）
@@ -394,6 +404,11 @@ public void MoveToMainList(SkillSlot slot) {
                 return;
             }
 
+            //移除前清除悬停状态
+            if (SkillSlot.HoveredSlot == slot) {
+                SkillSlot.ClearHoveredState();
+            }
+
             LibrarySlots.Remove(slot);
             var mainSlots = player.GetModPlayer<HalibutSave>().halibutUISkillSlots;
             mainSlots.Add(slot);
@@ -414,6 +429,11 @@ public void MoveToMainListWithAnimation(SkillSlot slot, Vector2 startPosition) {
                 return;
             }
 
+            //移除前清除悬停状态
+            if (SkillSlot.HoveredSlot == slot) {
+                SkillSlot.ClearHoveredState();
+            }
+
             LibrarySlots.Remove(slot);
 
             //计算目标位置（主面板技能列表中的位置）

Content/LegendWeapon/HalibutLegend/UI/SkillSlot.cs

@@ -35,6 +35,18 @@ internal class SkillSlot : UIHandle, ILocalizedModType
         private const int HintDelay = 10;//10帧后出现提示
         internal static SkillSlot HoveredSlot;//当前悬停的槽位(供面板调用绘制提示)
 
+        /// <summary>
+        /// 安全清除悬停状态，在任何可能导致HoveredSlot悬空的操作中调用
+        /// </summary>
+        internal static void ClearHoveredState() {
+            if (HoveredSlot != null) {
+                HoveredSlot.hoverTimer = 0;
+                HoveredSlot.hintTimer = 0;
+                HoveredSlot.hoverInMainPage = false;
+                HoveredSlot = null;
+            }
+        }
+
         //拖拽相关字段
         internal bool beingDragged;//是否正被拖拽(由面板设置)
 
@@ -97,6 +109,7 @@ public override void Update() {
                     !Main.oldKeyState.IsKeyDown(Microsoft.Xna.Framework.Input.Keys.W)) {
                     if (FishSkill != null && !beingDragged) {
                         Vector2 startPos = DrawPosition + Size / 2;
+                        ClearHoveredState();
                         SkillLibraryUI.Instance?.MoveToLibraryWithAnimation(this, startPos);
                     }
                 }
@@ -150,6 +163,11 @@ internal void DrawHint(SpriteBatch spriteBatch) {
             if (this != HoveredSlot) {
                 return;
             }
+            //兜底校验：如果面板已关闭、正在拖拽、或鼠标实际不在此槽位上，强制清除
+            if (!hoverInMainPage || beingDragged || HalibutUIPanel.Instance.Sengs <= 0f || HalibutUIPanel.Instance.IsDragging) {
+                ClearHoveredState();
+                return;
+            }
             if (hintTimer < HintDelay) {
                 return;
             }