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node_modules/bits-ui/dist/bits/utilities/focus-scope/focus-scope-manager.js

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+import { simpleBox } from "svelte-toolbelt";
+import { FocusScope } from "./focus-scope.svelte.js";
+export class FocusScopeManager {
+    static instance;
+    #scopeStack = simpleBox([]);
+    #focusHistory = new WeakMap();
+    #preFocusHistory = new WeakMap();
+    static getInstance() {
+        if (!this.instance) {
+            this.instance = new FocusScopeManager();
+        }
+        return this.instance;
+    }
+    register(scope) {
+        const current = this.getActive();
+        if (current && current !== scope) {
+            current.pause();
+        }
+        // capture the currently focused element before this scope becomes active
+        const activeElement = document.activeElement;
+        if (activeElement && activeElement !== document.body) {
+            this.#preFocusHistory.set(scope, activeElement);
+        }
+        this.#scopeStack.current = this.#scopeStack.current.filter((s) => s !== scope);
+        this.#scopeStack.current.unshift(scope);
+    }
+    unregister(scope) {
+        this.#scopeStack.current = this.#scopeStack.current.filter((s) => s !== scope);
+        const next = this.getActive();
+        if (next) {
+            next.resume();
+        }
+    }
+    getActive() {
+        return this.#scopeStack.current[0];
+    }
+    setFocusMemory(scope, element) {
+        this.#focusHistory.set(scope, element);
+    }
+    getFocusMemory(scope) {
+        return this.#focusHistory.get(scope);
+    }
+    isActiveScope(scope) {
+        return this.getActive() === scope;
+    }
+    setPreFocusMemory(scope, element) {
+        this.#preFocusHistory.set(scope, element);
+    }
+    getPreFocusMemory(scope) {
+        return this.#preFocusHistory.get(scope);
+    }
+    clearPreFocusMemory(scope) {
+        this.#preFocusHistory.delete(scope);
+    }
+}