Merge pull request #1 from cilice/add-handle-submit

Add handleSubmit handler

Author: erikras

src/useForm.js

@@ -1,4 +1,4 @@
-import { useState, useEffect, useRef } from 'react'
+import { useState, useEffect, useRef, useCallback } from 'react'
 import { createForm, formSubscriptionItems } from 'final-form'
 
 export const all = formSubscriptionItems.reduce((result, key) => {
@@ -12,7 +12,19 @@ const useForm = ({ subscription, ...config }) => {
   useEffect(() => form.current.subscribe(setState, subscription || all), [
     subscription
   ])
-  return { ...state, form: form.current }
+  const handleSubmit = useCallback(event => {
+    if (event) {
+      if (typeof event.preventDefault === 'function') {
+        event.preventDefault()
+      }
+      if (typeof event.stopPropagation === 'function') {
+        event.stopPropagation()
+      }
+    }
+    return form.current.submit()
+  }, [])
+
+  return { ...state, form: form.current, handleSubmit }
 }
 
 export default useForm