hardened camera mounting handling

FastNotes/src/notes/use-picker-lifecycle-guard.ts

@@ -0,0 +1,38 @@
+import { useIsFocused } from "@react-navigation/native"
+import { useCallback, useEffect, useRef } from "react"
+
+export function usePickerLifecycleGuard() {
+    const isFocused = useIsFocused()
+    const isMountedRef = useRef(true)
+    const isPickerActiveRef = useRef(false)
+
+    useEffect(() => {
+        return () => {
+            isMountedRef.current = false
+            isPickerActiveRef.current = false
+        }
+    }, [])
+
+    const isScreenActive = useCallback(() => {
+        return isMountedRef.current && isFocused
+    }, [isFocused])
+
+    const tryBeginPicker = useCallback(() => {
+        if (isPickerActiveRef.current) {
+            return false
+        }
+
+        isPickerActiveRef.current = true
+        return true
+    }, [])
+
+    const endPicker = useCallback(() => {
+        isPickerActiveRef.current = false
+    }, [])
+
+    return {
+        endPicker,
+        isScreenActive,
+        tryBeginPicker,
+    }
+}