CLI: Add basic Navigation template (Chat)

Summary:
Basic template using 'react-navigation' to make it easy to get started.

Not duplicating all the files in `android` and `ios` folders. These will be taken from the `HelloWorld` template. Let's not duplicate all of these files (it's a lot and they are large, especially the Xcode projects).

**Test plan (required)**

The app works locally. This PR is just a preparation for a next PR that will add support for 'react-native init --template Navigation'. Will have a proper test plan there.
Closes facebook/react-native#12153

Differential Revision: D4494776

Pulled By: mkonicek

fbshipit-source-id: b43eafd7a1424477f9493a3eb4083ba4dd3d3846

templates/HelloNavigation/components/KeyboardSpacer.js

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+/* @flow */
+
+import React, { PropTypes, Component } from 'react';
+import {
+  Platform,
+  View,
+  Keyboard,
+  LayoutAnimation,
+  UIManager,
+} from 'react-native';
+
+type Props = {
+  offset?: number;
+}
+
+type State = {
+  keyboardHeight: number
+}
+
+// Consider contributing this to the popular library:
+// https://github.com/Andr3wHur5t/react-native-keyboard-spacer
+
+/**
+ * On iOS, the software keyboard covers the screen by default.
+ * This is not desirable if there are TextInputs near the bottom of the screen -
+ * they would be covered by the keyboard and the user cannot see what they
+ * are typing.
+ * To get around this problem, place a `<KeyboardSpacer />` at the bottom
+ * of the screen, after your TextInputs. The keyboard spacer has size 0 and
+ * when the keyboard is shown it will grow to the same size as the keyboard,
+ * shifting all views above it and therefore making them visible.
+ *
+ * On Android, this component is not needed because resizing the UI when
+ * the keyboard is shown is supported by the OS.
+ * Simply set the `android:windowSoftInputMode="adjustResize"` attribute
+ * on the <activity> element in your AndroidManifest.xml.
+ *
+ * How is this different from KeyboardAvoidingView?
+ * The KeyboardAvoidingView doesn't work when used together with
+ * a ScrollView/ListView.
+ */
+const KeyboardSpacer = () => (
+  Platform.OS === 'ios' ? <KeyboardSpacerIOS /> : null
+)
+
+class KeyboardSpacerIOS extends Component<Props, Props, State> {
+  static propTypes = {
+    offset: PropTypes.number,
+  };
+
+  static defaultProps = {
+    offset: 0,
+  };
+
+  state: State = {
+    keyboardHeight: 0,
+  };
+
+  componentWillMount() {
+    this._registerEvents();
+  }
+
+  componentWillUnmount() {
+    this._unRegisterEvents();
+  }
+
+  _keyboardWillShowSubscription: { remove: Function };
+  _keyboardWillHideSubscription: { remove: Function };
+
+  _registerEvents = () => {
+    this._keyboardWillShowSubscription = Keyboard.addListener(
+      'keyboardWillShow',
+      this._keyboardWillShow
+    );
+    this._keyboardWillHideSubscription = Keyboard.addListener(
+      'keyboardWillHide',
+      this._keyboardWillHide
+    );
+  };
+
+  _unRegisterEvents = () => {
+    this._keyboardWillShowSubscription.remove();
+    this._keyboardWillHideSubscription.remove();
+  };
+
+  _configureLayoutAnimation = () => {
+    // Any duration is OK here. The `type: 'keyboard defines the animation.
+    LayoutAnimation.configureNext({
+      duration: 100,
+      update: {
+        type: 'keyboard',
+      }
+    });
+  }
+
+  _keyboardWillShow = (e: any) => {
+    this._configureLayoutAnimation();
+    this.setState({
+      keyboardHeight: e.endCoordinates.height - (this.props.offset || 0),
+    });
+  };
+
+  _keyboardWillHide = () => {
+    this._configureLayoutAnimation();
+    this.setState({
+      keyboardHeight: 0,
+    });
+  };
+
+  render() {
+    return <View style={{ height: this.state.keyboardHeight }} />;
+  }
+}
+
+export default KeyboardSpacer;

templates/HelloNavigation/components/ListItem.js

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+import React, { Component } from 'react';
+import {
+  Platform,
+  StyleSheet,
+  Text,
+  TouchableHighlight,
+  TouchableNativeFeedback,
+  View,
+} from 'react-native';
+
+/**
+ * Renders the right type of Touchable for the list item, based on platform.
+ */
+const Touchable = ({onPress, children}) => {
+  const child = React.Children.only(children);
+  if (Platform.OS === 'android') {
+    return (
+      <TouchableNativeFeedback onPress={onPress}>
+        {child}
+      </TouchableNativeFeedback>
+    );
+  } else {
+    return (
+      <TouchableHighlight onPress={onPress} underlayColor='#ddd'>
+        {child}
+      </TouchableHighlight>
+    );
+  }
+}
+
+const ListItem = ({label, onPress}) => (
+  <Touchable onPress={onPress}>
+    <View style={styles.item}>
+      <Text style={styles.label}>{label}</Text>
+    </View>
+  </Touchable>
+);
+
+const styles = StyleSheet.create({
+  item: {
+    height: 48,
+    justifyContent: 'center',
+    paddingLeft: 12,
+    borderBottomWidth: StyleSheet.hairlineWidth,
+    borderBottomColor: '#ddd',
+  },
+  label: {
+    fontSize: 16,
+  }
+});
+
+export default ListItem;

templates/HelloNavigation/index.android.js

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+import { AppRegistry } from 'react-native';
+
+import MainNavigator from './views/MainNavigator';
+
+AppRegistry.registerComponent('ChatExample', () => MainNavigator);

templates/HelloNavigation/index.ios.js

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+import { AppRegistry } from 'react-native';
+
+import MainNavigator from './views/MainNavigator';
+
+AppRegistry.registerComponent('ChatExample', () => MainNavigator);

templates/HelloNavigation/views/HomeScreenTabNavigator.js

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+import React, { Component } from 'react';
+import {
+  ListView,
+  Platform,
+  Text,
+} from 'react-native';
+import { TabNavigator } from 'react-navigation';
+
+import ChatListScreen from './chat/ChatListScreen';
+import FriendListScreen from './friends/FriendListScreen';
+
+/**
+ * Screen with tabs shown on app startup.
+ */
+const HomeScreenTabNavigator = TabNavigator({
+  Chats: {
+    screen: ChatListScreen,
+  },
+  Friends: {
+    screen: FriendListScreen,
+  },
+});
+
+export default HomeScreenTabNavigator;

templates/HelloNavigation/views/MainNavigator.js

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+/**
+ * This is an example React Native app demonstrates ListViews, text input and
+ * navigation between a few screens.
+ * https://github.com/facebook/react-native
+ */
+
+import React, { Component } from 'react';
+import { StackNavigator } from 'react-navigation';
+
+import HomeScreenTabNavigator from './HomeScreenTabNavigator';
+import ChatScreen from './chat/ChatScreen';
+
+/**
+ * Top-level navigator. Renders the application UI.
+ */
+const MainNavigator = StackNavigator({
+  Home: {
+    screen: HomeScreenTabNavigator,
+  },
+  Chat: {
+    screen: ChatScreen,
+  },
+});
+
+export default MainNavigator;

templates/HelloNavigation/views/chat/ChatListScreen.js

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+import React, { Component } from 'react';
+import {
+  Image,
+  ListView,
+  Platform,
+  StyleSheet,
+} from 'react-native';
+import ListItem from '../../components/ListItem';
+
+export default class ChatListScreen extends Component {
+
+  static navigationOptions = {
+    title: 'Chats',
+    header: {
+      visible: Platform.OS === 'ios',
+    },
+    tabBar: {
+      icon: ({ tintColor }) => (
+        <Image
+          // Using react-native-vector-icons works here too
+          source={require('./chat-icon.png')}
+          style={[styles.icon, {tintColor: tintColor}]}
+        />
+      ),
+    },
+  }
+
+  constructor(props) {
+    super(props);
+    const ds = new ListView.DataSource({rowHasChanged: (r1, r2) => r1 !== r2});
+    this.state = {
+      dataSource: ds.cloneWithRows([
+        'Claire', 'John'
+      ])
+    };
+  }
+
+  // Binding the function so it can be passed to ListView below
+  // and 'this' works properly inside _renderRow
+  _renderRow = (name) => {
+    return (
+      <ListItem
+        label={name}
+        onPress={() => this.props.navigation.navigate('Chat', {name: name})}
+      />
+    )
+  }
+
+  render() {
+    return (
+      <ListView
+        dataSource={this.state.dataSource}
+        renderRow={this._renderRow}
+        style={styles.listView}
+      />
+    );
+  }
+}
+
+const styles = StyleSheet.create({
+  listView: {
+    backgroundColor: 'white',
+  },
+  icon: {
+    width: 30,
+    height: 26,
+  },
+});