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src/components/rpg-runtime-shell/useRpgRuntimeOverlayState.ts

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+import { useEffect, useState } from 'react';
+
+import type { GameState } from '../../types';
+import type { GameCanvasEntitySelection } from '../GameCanvas';
+import type { SelectionStage } from '../rpg-entry';
+
+type OverlayPanel = 'character' | 'inventory' | null;
+
+function useLazyModalMount(active: boolean) {
+  const [shouldMount, setShouldMount] = useState(active);
+
+  useEffect(() => {
+    if (active) {
+      setShouldMount(true);
+    }
+  }, [active]);
+
+  return shouldMount;
+}
+
+/**
+ * RPG 运行态 overlay 与独立面板状态。
+ * 负责保留现有弹窗装配顺序，同时把壳层 UI 状态从旧 GameShell 命名迁出。
+ */
+export function useRpgRuntimeOverlayState(params: {
+  gameState: GameState;
+  isMapOpen: boolean;
+  characterChatModalOpen: boolean;
+  hasNpcModalOpen: boolean;
+}) {
+  const {
+    gameState,
+    isMapOpen,
+    characterChatModalOpen,
+    hasNpcModalOpen,
+  } = params;
+  const [selectionStage, setSelectionStage] = useState<SelectionStage>('platform');
+  const [overlayPanel, setOverlayPanel] = useState<OverlayPanel>(null);
+  const [selectedSceneEntity, setSelectedSceneEntity] =
+    useState<GameCanvasEntitySelection | null>(null);
+  const [showTeamModal, setShowTeamModal] = useState(false);
+
+  useEffect(() => {
+    setSelectedSceneEntity(null);
+  }, [gameState.currentScenePreset?.id, gameState.playerCharacter?.id]);
+
+  const shouldMountAdventureEntityModal = useLazyModalMount(
+    Boolean(selectedSceneEntity),
+  );
+  const shouldMountCampModal = useLazyModalMount(showTeamModal);
+  const shouldMountMapModal = useLazyModalMount(isMapOpen);
+  const shouldMountCharacterChatModal = useLazyModalMount(
+    characterChatModalOpen,
+  );
+  const shouldMountNpcModals = useLazyModalMount(hasNpcModalOpen);
+
+  const openOverlayPanel = (panel: Exclude<OverlayPanel, null>) => {
+    setSelectedSceneEntity(null);
+    setOverlayPanel(panel);
+  };
+
+  const closeOverlayPanel = () => setOverlayPanel(null);
+  const openPartyMemberDetails = (selection: GameCanvasEntitySelection) =>
+    setSelectedSceneEntity(selection);
+  const closeAdventureEntityModal = () => setSelectedSceneEntity(null);
+  const openCampModal = () => setShowTeamModal(true);
+  const closeCampModal = () => setShowTeamModal(false);
+
+  const resetSelectionFlow = () => setSelectionStage('platform');
+
+  const resetForSaveAndExit = () => {
+    setSelectedSceneEntity(null);
+    setOverlayPanel(null);
+    setShowTeamModal(false);
+    setSelectionStage('platform');
+  };
+
+  return {
+    selectionStage,
+    setSelectionStage,
+    resetSelectionFlow,
+    overlayPanel,
+    openOverlayPanel,
+    closeOverlayPanel,
+    selectedSceneEntity,
+    setSelectedSceneEntity,
+    openPartyMemberDetails,
+    closeAdventureEntityModal,
+    showTeamModal,
+    openCampModal,
+    closeCampModal,
+    resetForSaveAndExit,
+    shouldMountAdventureEntityModal,
+    shouldMountCampModal,
+    shouldMountMapModal,
+    shouldMountCharacterChatModal,
+    shouldMountNpcModals,
+  };
+}