chore(demo): add custom AppHeader component

Author: fadi-george

examples/demo/App.tsx

@@ -6,6 +6,7 @@ import { SafeAreaProvider } from 'react-native-safe-area-context';
 import Toast from 'react-native-toast-message';
 
 import OneSignalLogo from './assets/onesignal_logo.svg';
+import AppHeader from './src/components/AppHeader';
 import { OneSignalProvider } from './src/hooks/useOneSignal';
 import HomeScreen from './src/screens/HomeScreen';
 import SecondaryScreen from './src/screens/SecondaryScreen';
@@ -26,10 +27,7 @@ function App() {
         <NavigationContainer>
           <Stack.Navigator
             screenOptions={{
-              headerStyle: { backgroundColor: AppColors.osPrimary },
-              headerTintColor: AppColors.white,
-              headerTitleAlign: 'center',
-              headerShadowVisible: false,
+              header: (props) => <AppHeader {...props} />,
             }}
           >
             <Stack.Screen

examples/demo/src/components/AppHeader.tsx

@@ -0,0 +1,89 @@
+import { useNavigation } from '@react-navigation/native';
+import type { NativeStackHeaderProps } from '@react-navigation/native-stack';
+import React from 'react';
+import { Platform, Pressable, StyleSheet, Text, View } from 'react-native';
+import { useSafeAreaInsets } from 'react-native-safe-area-context';
+import Icon from 'react-native-vector-icons/MaterialIcons';
+
+import { AppColors } from '../theme';
+
+export default function AppHeader({ options, back }: NativeStackHeaderProps) {
+  const navigation = useNavigation();
+  const insets = useSafeAreaInsets();
+
+  const titleNode =
+    typeof options.headerTitle === 'function' ? (
+      options.headerTitle({ children: options.title ?? '', tintColor: AppColors.white })
+    ) : (
+      <Text style={styles.title}>{options.title ?? ''}</Text>
+    );
+
+  return (
+    <View style={[styles.shadowWrap, { paddingTop: insets.top }]}>
+      <View style={styles.bar}>
+        <View style={styles.side}>
+          {back ? (
+            <Pressable
+              onPress={navigation.goBack}
+              hitSlop={12}
+              style={({ pressed }) => [styles.backBtn, pressed && styles.pressed]}
+            >
+              <Icon name="arrow-back" size={24} color={AppColors.white} />
+            </Pressable>
+          ) : null}
+        </View>
+        <View style={styles.center}>{titleNode}</View>
+        <View style={styles.side} />
+      </View>
+    </View>
+  );
+}
+
+const styles = StyleSheet.create({
+  shadowWrap: {
+    backgroundColor: AppColors.osPrimary,
+    ...Platform.select({
+      ios: {
+        shadowColor: '#000',
+        shadowOffset: { width: 0, height: 4 },
+        shadowOpacity: 0.25,
+        shadowRadius: 6,
+      },
+      android: {
+        elevation: 8,
+      },
+    }),
+    zIndex: 10,
+  },
+  bar: {
+    height: 56,
+    flexDirection: 'row',
+    alignItems: 'center',
+    paddingHorizontal: 4,
+  },
+  side: {
+    width: 56,
+    alignItems: 'center',
+    justifyContent: 'center',
+  },
+  center: {
+    flex: 1,
+    alignItems: 'center',
+    justifyContent: 'center',
+  },
+  backBtn: {
+    width: 40,
+    height: 40,
+    alignItems: 'center',
+    justifyContent: 'center',
+    borderRadius: 20,
+  },
+  pressed: {
+    opacity: 0.6,
+  },
+  title: {
+    color: AppColors.white,
+    fontSize: 18,
+    fontWeight: '600',
+  },
+});