refactor: fix context

src/EmojiKeyboard.tsx

@@ -8,7 +8,6 @@ import {
   Animated,
   NativeSyntheticEvent,
   NativeScrollEvent,
-  ViewToken,
 } from 'react-native';
 import { CATEGORIES, CategoryTypes } from './types';
 import { EmojiCategory } from './components/EmojiCategory';
@@ -24,17 +23,6 @@ export const EmojiKeyboard = () => {
   const scrollX = React.useRef(new Animated.Value(0)).current;
   const scrollNav = React.useRef(new Animated.Value(0)).current;
 
-  const onViewableItemsChanged = React.useRef(
-    ({ viewableItems }: { viewableItems: Array<ViewToken> }) => {
-      if (viewableItems.length > 0 && viewableItems[0].index !== null) {
-        ctx?.setActiveCategoryIndex(viewableItems[0].index);
-      }
-    }
-  );
-  const viewabilityConfig = React.useRef({
-    viewAreaCoveragePercentThreshold: 60,
-  });
-
   const getItemLayout = (
     _: CategoryTypes[] | null | undefined,
     index: number
@@ -66,7 +54,7 @@ export const EmojiKeyboard = () => {
   );
 
   return (
-    <View style={[styles.container, ctx?.containerStyles]}>
+    <View style={[styles.container, ctx.containerStyles]}>
       <FlatList
         data={CATEGORIES}
         keyExtractor={(item) => item}
@@ -81,8 +69,6 @@ export const EmojiKeyboard = () => {
         decelerationRate="fast"
         getItemLayout={getItemLayout}
         onScroll={onScroll}
-        onViewableItemsChanged={onViewableItemsChanged.current}
-        viewabilityConfig={viewabilityConfig.current}
       />
       <Categories flatListRef={flatListRef} scrollNav={scrollNav} />
     </View>

src/KeyboardContext.tsx

@@ -1,18 +1,25 @@
 import * as React from 'react';
 import type { ViewStyle } from 'react-native';
+import {
+  defaultKeyboardContext,
+  defaultKeyboardValues,
+} from './KeyboardProvider';
 import type { EmojiType } from './types';
 
 export type KeyboardProps = {
   onEmojiSelected: (emoji: EmojiType) => void;
-  numberOfColumns?: number;
   emojiSize?: number;
   containerStyles?: ViewStyle;
 };
 export type ContextValues = {
   activeCategoryIndex: number;
   setActiveCategoryIndex: (index: number) => void;
+  numberOfColumns: number;
 };
 
 export const KeyboardContext = React.createContext<
-  (KeyboardProps & ContextValues) | null
->(null);
+  Required<KeyboardProps> & ContextValues
+>({
+  ...defaultKeyboardContext,
+  ...defaultKeyboardValues,
+});

src/KeyboardProvider.tsx

@@ -10,20 +10,26 @@ type ProviderProps = KeyboardProps & {
   children: React.ReactNode;
 };
 
-export const defaultKeyboardContext: KeyboardProps = {
+export const defaultKeyboardContext: Required<KeyboardProps> = {
   onEmojiSelected: (_emoji: EmojiType) => {},
-  numberOfColumns: 7,
   emojiSize: 24,
+  containerStyles: {},
 };
 
-export const defaultKeyboardValues: Partial<ContextValues> = {
-  //   activeCategoryIndex: 0,
+export const defaultKeyboardValues: ContextValues = {
+  activeCategoryIndex: 0,
+  setActiveCategoryIndex: () => {},
+  numberOfColumns: 5,
 };
 
 export const KeyboardProvider: React.FC<ProviderProps> = React.memo((props) => {
-  const [activeCategoryIndex, setActiveCategoryIndex] = React.useState(0);
+  const [activeCategoryIndex, setActive] = React.useState(0);
 
-  const value: KeyboardProps & ContextValues = {
+  const setActiveCategoryIndex = React.useCallback((index: number) => {
+    setActive(index);
+  }, []);
+
+  const value: Required<KeyboardProps> & ContextValues = {
     ...defaultKeyboardContext,
     ...defaultKeyboardValues,
     ...props,

src/components/Categories.tsx

@@ -11,35 +11,45 @@ type CategoriesProps = {
 
 export const Categories = ({ flatListRef, scrollNav }: CategoriesProps) => {
   const ctx = React.useContext(KeyboardContext);
-  const handleScrollToCategory = (category: CategoryTypes) => {
-    flatListRef?.current?.scrollToIndex({
-      index: CATEGORIES.indexOf(category),
-    });
-  };
+  const handleScrollToCategory = React.useCallback(
+    (category: CategoryTypes) => {
+      flatListRef?.current?.scrollToIndex({
+        index: CATEGORIES.indexOf(category),
+      });
+    },
+    [flatListRef]
+  );
+
+  const rendarItem = React.useCallback(
+    ({ item, index }) => (
+      <CategoryItem
+        item={item}
+        index={index}
+        handleScrollToCategory={handleScrollToCategory}
+      />
+    ),
+    [handleScrollToCategory]
+  );
+
+  const activeIndicator = React.useCallback(
+    () => (
+      <Animated.View style={[styles.activeIndicator, { left: scrollNav }]} />
+    ),
+    [scrollNav]
+  );
+
   return (
     <View style={styles.bottomBar}>
       <View style={styles.navigation}>
         <FlatList
           data={CATEGORIES_NAVIGATION}
           keyExtractor={(item) => item.category}
-          renderItem={({ item, index }) => (
-            <CategoryItem
-              item={item}
-              index={index}
-              handleScrollToCategory={handleScrollToCategory}
-            />
-          )}
+          renderItem={rendarItem}
           ItemSeparatorComponent={() => <View style={styles.separator} />}
           scrollEnabled={false}
           horizontal={true}
           onScrollToIndexFailed={(e) => console.log(e)}
-          ListHeaderComponent={() => {
-            return (
-              <Animated.View
-                style={[styles.activeIndicator, { left: scrollNav }]}
-              />
-            );
-          }}
+          ListHeaderComponent={activeIndicator}
           extraData={ctx?.activeCategoryIndex}
         />
       </View>

src/components/EmojiCategory.tsx

@@ -16,10 +16,9 @@ export const EmojiCategory = ({ item }: { item: CategoryTypes }) => {
   const { width } = useWindowDimensions();
   const ctx = React.useContext(KeyboardContext);
   const numberOfColumns = React.useRef<number>(
-    Math.floor(width / (ctx?.emojiSize ? ctx?.emojiSize : 0 + 16))
+    Math.floor(width / (ctx.emojiSize + 16))
   );
   const [data, setData] = React.useState<EmojiType[]>([]);
-  // console.log(width);
 
   React.useEffect(() => {
     const newData = emojisByGroup[item];
@@ -63,11 +62,11 @@ const styles = StyleSheet.create({
   container: {
     flex: 1,
     paddingHorizontal: 10,
-    marginTop: 12,
+    marginTop: 6,
   },
   sectionTitle: {
     opacity: 0.6,
-    marginBottom: 12,
+    marginBottom: 6,
     marginLeft: 12,
   },
   footer: { height: 70 },