Initial commit

node_modules/@fluentui/react-tabster/lib/hooks/useOnKeyboardNavigationChange.js

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+import * as React from 'react';
+import { useEventCallback } from '@fluentui/react-utilities';
+import { useKeyborgRef } from './useKeyborgRef';
+/**
+ * Instantiates [keyborg](https://github.com/microsoft/keyborg) and subscribes to changes
+ * in the keyboard navigation mode.
+ *
+ * @param callback - called every time the keyboard navigation state changes
+ */ export function useOnKeyboardNavigationChange(callback) {
+    const keyborgRef = useKeyborgRef();
+    const eventCallback = useEventCallback(callback);
+    React.useEffect(()=>{
+        const keyborg = keyborgRef.current;
+        if (keyborg) {
+            const cb = (next)=>{
+                eventCallback(next);
+            };
+            keyborg.subscribe(cb);
+            cb(keyborg.isNavigatingWithKeyboard());
+            return ()=>{
+                keyborg.unsubscribe(cb);
+            };
+        }
+    }, [
+        keyborgRef,
+        eventCallback
+    ]);
+}