Kebab file names

snippets/use-hover.md

@@ -0,0 +1,56 @@
+---
+title: React useHover hook
+tags: hooks,state,callback
+author: chalarangelo
+cover: pink-flower-tree
+firstSeen: 2021-10-05T05:00:00-04:00
+---
+
+Handles the event of hovering over the wrapped component.
+
+- Use the `useState()` hook to create a variable that holds the hovering state.
+- Use the `useCallback()` hook to memoize two handler functions that update the state.
+- Use the `useCallback()` hook to create a callback ref and create or update the listeners for the `'mouseover'` and `'mouseout'` events.
+- Use the `useRef()` hook to keep track of the last node passed to `callbackRef` to be able to remove its listeners.
+
+```jsx
+const useHover = () => {
+  const [isHovering, setIsHovering] = React.useState(false);
+
+  const handleMouseOver = React.useCallback(() => setIsHovering(true), []);
+  const handleMouseOut = React.useCallback(() => setIsHovering(false), []);
+
+  const nodeRef = React.useRef();
+
+  const callbackRef = React.useCallback(
+    node => {
+      if (nodeRef.current) {
+        nodeRef.current.removeEventListener('mouseover', handleMouseOver);
+        nodeRef.current.removeEventListener('mouseout', handleMouseOut);
+      }
+
+      nodeRef.current = node;
+
+      if (nodeRef.current) {
+        nodeRef.current.addEventListener('mouseover', handleMouseOver);
+        nodeRef.current.addEventListener('mouseout', handleMouseOut);
+      }
+    },
+    [handleMouseOver, handleMouseOut]
+  );
+
+  return [callbackRef, isHovering];
+};
+```
+
+```jsx
+const MyApp = () => {
+  const [hoverRef, isHovering] = useHover();
+
+  return <div ref={hoverRef}>{isHovering ? 'Hovering' : 'Not hovering'}</div>;
+};
+
+ReactDOM.createRoot(document.getElementById('root')).render(
+  <MyApp />
+);
+```