feat: add ripple effect tutorial

10-ripple-effect/.expo-shared/assets.json

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+{
+  "12bb71342c6255bbf50437ec8f4441c083f47cdb74bd89160c15e4f43e52a1cb": true,
+  "40b842e832070c58deac6aa9e08fa459302ee3f9da492c7e77d93d2fbf4a56fd": true
+}

10-ripple-effect/.gitignore

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+node_modules/
+.expo/
+npm-debug.*
+*.jks
+*.p8
+*.p12
+*.key
+*.mobileprovision
+*.orig.*
+web-build/
+
+# macOS
+.DS_Store

10-ripple-effect/App.tsx

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+import React from 'react';
+import { StyleSheet, Text, View } from 'react-native';
+import Ripple from './components/Ripple';
+
+export default function App() {
+  return (
+    <View style={styles.container}>
+      <Ripple
+        style={styles.ripple}
+        onTap={() => {
+          console.log('tap');
+        }}
+      >
+        <Text style={{ fontSize: 25 }}>Tap</Text>
+      </Ripple>
+    </View>
+  );
+}
+
+const styles = StyleSheet.create({
+  container: {
+    flex: 1,
+    backgroundColor: '#fff',
+    alignItems: 'center',
+    justifyContent: 'center',
+  },
+  ripple: {
+    width: 200,
+    height: 200,
+    backgroundColor: 'white',
+    alignItems: 'center',
+    justifyContent: 'center',
+    borderRadius: 25,
+    // iOS
+    shadowOpacity: 0.2,
+    shadowOffset: { width: 0, height: 0 },
+    shadowRadius: 20,
+    // Android
+    elevation: 2,
+  },
+});

10-ripple-effect/app.json

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+{
+  "expo": {
+    "name": "10-ripple-effect",
+    "slug": "10-ripple-effect",
+    "version": "1.0.0",
+    "orientation": "portrait",
+    "icon": "./assets/icon.png",
+    "splash": {
+      "image": "./assets/splash.png",
+      "resizeMode": "contain",
+      "backgroundColor": "#ffffff"
+    },
+    "updates": {
+      "fallbackToCacheTimeout": 0
+    },
+    "assetBundlePatterns": [
+      "**/*"
+    ],
+    "ios": {
+      "supportsTablet": true
+    },
+    "android": {
+      "adaptiveIcon": {
+        "foregroundImage": "./assets/adaptive-icon.png",
+        "backgroundColor": "#FFFFFF"
+      }
+    },
+    "web": {
+      "favicon": "./assets/favicon.png"
+    }
+  }
+}

10-ripple-effect/babel.config.js

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+module.exports = function (api) {
+  api.cache(true);
+  return {
+    presets: ['babel-preset-expo'],
+    plugins: ['react-native-reanimated/plugin'],
+  };
+};

10-ripple-effect/components/Ripple.tsx

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+import React from 'react';
+import { StyleProp, StyleSheet, View, ViewStyle } from 'react-native';
+import {
+  TapGestureHandler,
+  TapGestureHandlerGestureEvent,
+} from 'react-native-gesture-handler';
+import Animated, {
+  measure,
+  runOnJS,
+  useAnimatedGestureHandler,
+  useAnimatedRef,
+  useAnimatedStyle,
+  useSharedValue,
+  withTiming,
+} from 'react-native-reanimated';
+
+interface RippleProps {
+  style?: StyleProp<ViewStyle>;
+  contentContainerStyle?: StyleProp<ViewStyle>;
+  onTap?: () => void;
+}
+
+const Ripple: React.FC<RippleProps> = ({
+  style,
+  onTap,
+  children,
+  contentContainerStyle,
+}) => {
+  const centerX = useSharedValue(0);
+  const centerY = useSharedValue(0);
+  const scale = useSharedValue(0);
+
+  const aRef = useAnimatedRef<View>();
+  const width = useSharedValue(0);
+  const height = useSharedValue(0);
+
+  const rippleOpacity = useSharedValue(1);
+
+  const tapGestureEvent =
+    useAnimatedGestureHandler<TapGestureHandlerGestureEvent>({
+      onStart: (tapEvent) => {
+        const layout = measure(aRef);
+        width.value = layout.width;
+        height.value = layout.height;
+
+        centerX.value = tapEvent.x;
+        centerY.value = tapEvent.y;
+
+        rippleOpacity.value = 1;
+        scale.value = 0;
+        scale.value = withTiming(1, { duration: 1000 });
+      },
+      onActive: () => {
+        if (onTap) runOnJS(onTap)();
+      },
+      onFinish: () => {
+        rippleOpacity.value = withTiming(0);
+      },
+    });
+
+  const rStyle = useAnimatedStyle(() => {
+    const circleRadius = Math.sqrt(width.value ** 2 + height.value ** 2);
+
+    const translateX = centerX.value - circleRadius;
+    const translateY = centerY.value - circleRadius;
+
+    return {
+      width: circleRadius * 2,
+      height: circleRadius * 2,
+      borderRadius: circleRadius,
+      opacity: rippleOpacity.value,
+      backgroundColor: 'rgba(0,0,0,0.2)',
+      position: 'absolute',
+      top: 0,
+      left: 0,
+      transform: [
+        { translateX },
+        { translateY },
+        {
+          scale: scale.value,
+        },
+      ],
+    };
+  });
+
+  return (
+    <View ref={aRef} style={style}>
+      <TapGestureHandler onGestureEvent={tapGestureEvent}>
+        <Animated.View style={[style, { overflow: 'hidden' }]}>
+          <View>{children}</View>
+          <Animated.View style={rStyle} />
+        </Animated.View>
+      </TapGestureHandler>
+    </View>
+  );
+};
+
+export default Ripple;

10-ripple-effect/package.json

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+{
+  "main": "node_modules/expo/AppEntry.js",
+  "scripts": {
+    "start": "expo start",
+    "android": "expo start --android",
+    "ios": "expo start --ios",
+    "web": "expo start --web",
+    "eject": "expo eject"
+  },
+  "dependencies": {
+    "expo": "~42.0.1",
+    "expo-status-bar": "~1.0.4",
+    "react": "16.13.1",
+    "react-dom": "16.13.1",
+    "react-native": "https://github.com/expo/react-native/archive/sdk-42.0.0.tar.gz",
+    "react-native-gesture-handler": "^1.10.3",
+    "react-native-reanimated": "^2.2.0",
+    "react-native-web": "~0.13.12"
+  },
+  "devDependencies": {
+    "@babel/core": "^7.9.0",
+    "@types/react": "~16.9.35",
+    "@types/react-native": "~0.63.2",
+    "typescript": "~4.0.0"
+  },
+  "private": true
+}

10-ripple-effect/tsconfig.json

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+{
+  "extends": "expo/tsconfig.base",
+  "compilerOptions": {
+    "strict": true
+  }
+}