1 files changed, 0 insertions, 127 deletions
diff --git a/app_expo/navigators/navigation-utilities.tsx b/app_expo/navigators/navigation-utilities.tsx
deleted file mode 100644
index 95137a4..0000000
--- a/app_expo/navigators/navigation-utilities.tsx
+++ /dev/null
@@ -1,127 +0,0 @@
-import React, { useState, useEffect, useRef } from 'react'
-import { BackHandler } from 'react-native'
-import { PartialState, NavigationState, NavigationContainerRef } from '@react-navigation/native'
-
-export const RootNavigation = {
-  navigate(name: string) {
-    name // eslint-disable-line no-unused-expressions
-  },
-  goBack() {}, // eslint-disable-line @typescript-eslint/no-empty-function
-  resetRoot(state?: PartialState<NavigationState> | NavigationState) {}, // eslint-disable-line @typescript-eslint/no-unused-vars, @typescript-eslint/no-empty-function
-  getRootState(): NavigationState {
-    return {} as any
-  },
-}
-
-export const setRootNavigation = (ref: React.RefObject<NavigationContainerRef>) => {
-  for (const method in RootNavigation) {
-    RootNavigation[method] = (...args: any) => {
-      if (ref.current) {
-        return ref.current[method](...args)
-      }
-    }
-  }
-}
-
-/**
- * Gets the current screen from any navigation state.
- */
-export function getActiveRouteName(state: NavigationState | PartialState<NavigationState>) {
-  const route = state.routes[state.index]
-
-  // Found the active route -- return the name
-  if (!route.state) return route.name
-
-  // Recursive call to deal with nested routers
-  return getActiveRouteName(route.state)
-}
-
-/**
- * Hook that handles Android back button presses and forwards those on to
- * the navigation or allows exiting the app.
- */
-export function useBackButtonHandler(
-  ref: React.RefObject<NavigationContainerRef>,
-  canExit: (routeName: string) => boolean,
-) {
-  const canExitRef = useRef(canExit)
-
-  useEffect(() => {
-    canExitRef.current = canExit
-  }, [canExit])
-
-  useEffect(() => {
-    // We'll fire this when the back button is pressed on Android.
-    const onBackPress = () => {
-      const navigation = ref.current
-
-      if (navigation == null) {
-        return false
-      }
-
-      // grab the current route
-      const routeName = getActiveRouteName(navigation.getRootState())
-
-      // are we allowed to exit?
-      if (canExitRef.current(routeName)) {
-        // let the system know we've not handled this event
-        return false
-      }
-
-      // we can't exit, so let's turn this into a back action
-      if (navigation.canGoBack()) {
-        navigation.goBack()
-
-        return true
-      }
-
-      return false
-    }
-
-    // Subscribe when we come to life
-    BackHandler.addEventListener('hardwareBackPress', onBackPress)
-
-    // Unsubscribe when we're done
-    return () => BackHandler.removeEventListener('hardwareBackPress', onBackPress)
-  }, [ref])
-}
-
-/**
- * Custom hook for persisting navigation state.
- */
-export function useNavigationPersistence(storage: any, persistenceKey: string) {
-  const [initialNavigationState, setInitialNavigationState] = useState()
-  const [isRestoringNavigationState, setIsRestoringNavigationState] = useState(true)
-
-  const routeNameRef = useRef()
-  const onNavigationStateChange = (state) => {
-    const previousRouteName = routeNameRef.current
-    const currentRouteName = getActiveRouteName(state)
-
-    if (previousRouteName !== currentRouteName) {
-      // track screens.
-      __DEV__ && console.tron.log(currentRouteName)
-    }
-
-    // Save the current route name for later comparision
-    routeNameRef.current = currentRouteName
-
-    // Persist state to storage
-    storage.save(persistenceKey, state)
-  }
-
-  const restoreState = async () => {
-    try {
-      const state = await storage.load(persistenceKey)
-      if (state) setInitialNavigationState(state)
-    } finally {
-      setIsRestoringNavigationState(false)
-    }
-  }
-
-  useEffect(() => {
-    if (isRestoringNavigationState) restoreState()
-  }, [isRestoringNavigationState])
-
-  return { onNavigationStateChange, restoreState, initialNavigationState }
-}