Improve basic screen components to match linter

src/components/Screens/BasicLoadingScreen.js

@@ -3,6 +3,7 @@
 import * as React from 'react';
 import {View} from 'react-native';
 import {ActivityIndicator, withTheme} from 'react-native-paper';
+import type {CustomTheme} from '../../managers/ThemeManager';
 
 /**
  * Component used to display a header button
@@ -10,26 +11,27 @@ import {ActivityIndicator, withTheme} from 'react-native-paper';
  * @param props Props to pass to the component
  * @return {*}
  */
-function BasicLoadingScreen(props) {
+function BasicLoadingScreen(props: {
-    const {colors} = props.theme;
+  theme: CustomTheme,
-    let position = undefined;
+  isAbsolute: boolean,
-    if (props.isAbsolute !== undefined && props.isAbsolute)
+}): React.Node {
-        position = 'absolute';
+  const {theme, isAbsolute} = props;
+  const {colors} = theme;
+  let position;
+  if (isAbsolute != null && isAbsolute) position = 'absolute';
 
   return (
-        <View style={{
+    <View
+      style={{
         backgroundColor: colors.background,
-            position: position,
+        position,
         top: 0,
         right: 0,
         width: '100%',
         height: '100%',
         justifyContent: 'center',
       }}>
-            <ActivityIndicator
+      <ActivityIndicator animating size="large" color={colors.primary} />
-                animating={true}
-                size={'large'}
-                color={colors.primary}/>
     </View>
   );
 }

src/components/Screens/ErrorView.js

@@ -2,168 +2,25 @@
 
 import * as React from 'react';
 import {Button, Subheading, withTheme} from 'react-native-paper';
-import {StyleSheet, View} from "react-native";
+import {StyleSheet, View} from 'react-native';
-import MaterialCommunityIcons from "react-native-vector-icons/MaterialCommunityIcons";
+import MaterialCommunityIcons from 'react-native-vector-icons/MaterialCommunityIcons';
 import i18n from 'i18n-js';
-import {ERROR_TYPE} from "../../utils/WebData";
 import * as Animatable from 'react-native-animatable';
+import {StackNavigationProp} from '@react-navigation/stack';
+import {ERROR_TYPE} from '../../utils/WebData';
+import type {CustomTheme} from '../../managers/ThemeManager';
 
-type Props = {
+type PropsType = {
-    navigation: Object,
+  navigation: StackNavigationProp,
-    route: Object,
+  theme: CustomTheme,
-    errorCode: number,
+  route: {name: string},
-    onRefresh: Function,
+  onRefresh?: () => void,
-    icon: string,
+  errorCode?: number,
-    message: string,
+  icon?: string,
-    showRetryButton: boolean,
+  message?: string,
-}
+  showRetryButton?: boolean,
-
-type State = {
-    refreshing: boolean,
-}
-
-class ErrorView extends React.PureComponent<Props, State> {
-
-    colors: Object;
-
-    message: string;
-    icon: string;
-
-    showLoginButton: boolean;
-
-    static defaultProps = {
-        errorCode: 0,
-        icon: '',
-        message: '',
-        showRetryButton: true,
-    }
-
-    state = {
-        refreshing: false,
 };
 
-    constructor(props) {
-        super(props);
-        this.colors = props.theme.colors;
-        this.icon = "";
-    }
-
-    generateMessage() {
-        this.showLoginButton = false;
-        if (this.props.errorCode !== 0) {
-            switch (this.props.errorCode) {
-                case ERROR_TYPE.BAD_CREDENTIALS:
-                    this.message = i18n.t("errors.badCredentials");
-                    this.icon = "account-alert-outline";
-                    break;
-                case ERROR_TYPE.BAD_TOKEN:
-                    this.message = i18n.t("errors.badToken");
-                    this.icon = "account-alert-outline";
-                    this.showLoginButton = true;
-                    break;
-                case ERROR_TYPE.NO_CONSENT:
-                    this.message = i18n.t("errors.noConsent");
-                    this.icon = "account-remove-outline";
-                    break;
-                case ERROR_TYPE.TOKEN_SAVE:
-                    this.message = i18n.t("errors.tokenSave");
-                    this.icon = "alert-circle-outline";
-                    break;
-                case ERROR_TYPE.BAD_INPUT:
-                    this.message = i18n.t("errors.badInput");
-                    this.icon = "alert-circle-outline";
-                    break;
-                case ERROR_TYPE.FORBIDDEN:
-                    this.message = i18n.t("errors.forbidden");
-                    this.icon = "lock";
-                    break;
-                case ERROR_TYPE.CONNECTION_ERROR:
-                    this.message = i18n.t("errors.connectionError");
-                    this.icon = "access-point-network-off";
-                    break;
-                case ERROR_TYPE.SERVER_ERROR:
-                    this.message = i18n.t("errors.serverError");
-                    this.icon = "server-network-off";
-                    break;
-                default:
-                    this.message = i18n.t("errors.unknown");
-                    this.icon = "alert-circle-outline";
-                    break;
-            }
-            this.message += "\n\nCode " + this.props.errorCode;
-        } else {
-            this.message = this.props.message;
-            this.icon = this.props.icon;
-        }
-
-    }
-
-    getRetryButton() {
-        return <Button
-            mode={'contained'}
-            icon={'refresh'}
-            onPress={this.props.onRefresh}
-            style={styles.button}
-        >
-            {i18n.t("general.retry")}
-        </Button>;
-    }
-
-    goToLogin = () => {
-        this.props.navigation.navigate("login",
-            {
-                screen: 'login',
-                params: {nextScreen: this.props.route.name}
-            })
-    };
-
-    getLoginButton() {
-        return <Button
-            mode={'contained'}
-            icon={'login'}
-            onPress={this.goToLogin}
-            style={styles.button}
-        >
-            {i18n.t("screens.login.title")}
-        </Button>;
-    }
-
-    render() {
-        this.generateMessage();
-        return (
-            <Animatable.View
-                style={{
-                ...styles.outer,
-                backgroundColor: this.colors.background
-            }}
-                animation={"zoomIn"}
-                duration={200}
-                useNativeDriver
-            >
-                <View style={styles.inner}>
-                    <View style={styles.iconContainer}>
-                        <MaterialCommunityIcons
-                            name={this.icon}
-                            size={150}
-                            color={this.colors.textDisabled}/>
-                    </View>
-                    <Subheading style={{
-                        ...styles.subheading,
-                        color: this.colors.textDisabled
-                    }}>
-                        {this.message}
-                    </Subheading>
-                    {this.props.showRetryButton
-                        ? (this.showLoginButton
-                            ? this.getLoginButton()
-                            : this.getRetryButton())
-                        : null}
-                </View>
-            </Animatable.View>
-        );
-    }
-}
-
 const styles = StyleSheet.create({
   outer: {
     height: '100%',
@@ -175,18 +32,159 @@ const styles = StyleSheet.create({
   iconContainer: {
     marginLeft: 'auto',
     marginRight: 'auto',
-        marginBottom: 20
+    marginBottom: 20,
   },
   subheading: {
     textAlign: 'center',
-        paddingHorizontal: 20
+    paddingHorizontal: 20,
   },
   button: {
     marginTop: 10,
     marginLeft: 'auto',
     marginRight: 'auto',
-    }
+  },
 });
 
+class ErrorView extends React.PureComponent<PropsType> {
+  static defaultProps = {
+    onRefresh: (): void => null,
+    errorCode: 0,
+    icon: '',
+    message: '',
+    showRetryButton: true,
+  };
+
+  message: string;
+
+  icon: string;
+
+  showLoginButton: boolean;
+
+  constructor(props: PropsType) {
+    super(props);
+    this.icon = '';
+  }
+
+  getRetryButton(): React.Node {
+    const {props} = this;
+    return (
+      <Button
+        mode="contained"
+        icon="refresh"
+        onPress={props.onRefresh}
+        style={styles.button}>
+        {i18n.t('general.retry')}
+      </Button>
+    );
+  }
+
+  getLoginButton(): React.Node {
+    return (
+      <Button
+        mode="contained"
+        icon="login"
+        onPress={this.goToLogin}
+        style={styles.button}>
+        {i18n.t('screens.login.title')}
+      </Button>
+    );
+  }
+
+  goToLogin = () => {
+    const {props} = this;
+    props.navigation.navigate('login', {
+      screen: 'login',
+      params: {nextScreen: props.route.name},
+    });
+  };
+
+  generateMessage() {
+    const {props} = this;
+    this.showLoginButton = false;
+    if (props.errorCode !== 0) {
+      switch (props.errorCode) {
+        case ERROR_TYPE.BAD_CREDENTIALS:
+          this.message = i18n.t('errors.badCredentials');
+          this.icon = 'account-alert-outline';
+          break;
+        case ERROR_TYPE.BAD_TOKEN:
+          this.message = i18n.t('errors.badToken');
+          this.icon = 'account-alert-outline';
+          this.showLoginButton = true;
+          break;
+        case ERROR_TYPE.NO_CONSENT:
+          this.message = i18n.t('errors.noConsent');
+          this.icon = 'account-remove-outline';
+          break;
+        case ERROR_TYPE.TOKEN_SAVE:
+          this.message = i18n.t('errors.tokenSave');
+          this.icon = 'alert-circle-outline';
+          break;
+        case ERROR_TYPE.BAD_INPUT:
+          this.message = i18n.t('errors.badInput');
+          this.icon = 'alert-circle-outline';
+          break;
+        case ERROR_TYPE.FORBIDDEN:
+          this.message = i18n.t('errors.forbidden');
+          this.icon = 'lock';
+          break;
+        case ERROR_TYPE.CONNECTION_ERROR:
+          this.message = i18n.t('errors.connectionError');
+          this.icon = 'access-point-network-off';
+          break;
+        case ERROR_TYPE.SERVER_ERROR:
+          this.message = i18n.t('errors.serverError');
+          this.icon = 'server-network-off';
+          break;
+        default:
+          this.message = i18n.t('errors.unknown');
+          this.icon = 'alert-circle-outline';
+          break;
+      }
+      this.message += `\n\nCode ${props.errorCode}`;
+    } else {
+      this.message = props.message;
+      this.icon = props.icon;
+    }
+  }
+
+  render(): React.Node {
+    const {props} = this;
+    this.generateMessage();
+    let button;
+    if (this.showLoginButton) button = this.getLoginButton();
+    else if (props.showRetryButton) button = this.getRetryButton();
+    else button = null;
+
+    return (
+      <Animatable.View
+        style={{
+          ...styles.outer,
+          backgroundColor: props.theme.colors.background,
+        }}
+        animation="zoomIn"
+        duration={200}
+        useNativeDriver>
+        <View style={styles.inner}>
+          <View style={styles.iconContainer}>
+            <MaterialCommunityIcons
+              name={this.icon}
+              size={150}
+              color={props.theme.colors.textDisabled}
+            />
+          </View>
+          <Subheading
+            style={{
+              ...styles.subheading,
+              color: props.theme.colors.textDisabled,
+            }}>
+            {this.message}
+          </Subheading>
+          {button}
+        </View>
+      </Animatable.View>
+    );
+  }
+}
 
 export default withTheme(ErrorView);

src/components/Screens/WebViewScreen.js

@@ -1,40 +1,43 @@
 // @flow
 
 import * as React from 'react';
-import WebView from "react-native-webview";
+import WebView from 'react-native-webview';
-import BasicLoadingScreen from "./BasicLoadingScreen";
+import {
-import ErrorView from "./ErrorView";
+  Divider,
-import {ERROR_TYPE} from "../../utils/WebData";
+  HiddenItem,
-import MaterialHeaderButtons, {Item} from '../Overrides/CustomHeaderButton';
+  OverflowMenu,
-import {Divider, HiddenItem, OverflowMenu} from "react-navigation-header-buttons";
+} from 'react-navigation-header-buttons';
 import i18n from 'i18n-js';
-import {Animated, BackHandler, Linking} from "react-native";
+import {Animated, BackHandler, Linking} from 'react-native';
-import {withCollapsible} from "../../utils/withCollapsible";
+import MaterialCommunityIcons from 'react-native-vector-icons/MaterialCommunityIcons';
-import MaterialCommunityIcons from "react-native-vector-icons/MaterialCommunityIcons";
+import {withTheme} from 'react-native-paper';
-import {withTheme} from "react-native-paper";
+import {StackNavigationProp} from '@react-navigation/stack';
-import type {CustomTheme} from "../../managers/ThemeManager";
+import {Collapsible} from 'react-navigation-collapsible';
-import {StackNavigationProp} from "@react-navigation/stack";
+import type {CustomTheme} from '../../managers/ThemeManager';
-import {Collapsible} from "react-navigation-collapsible";
+import {withCollapsible} from '../../utils/withCollapsible';
+import MaterialHeaderButtons, {Item} from '../Overrides/CustomHeaderButton';
+import {ERROR_TYPE} from '../../utils/WebData';
+import ErrorView from './ErrorView';
+import BasicLoadingScreen from './BasicLoadingScreen';
 
-type Props = {
+type PropsType = {
   navigation: StackNavigationProp,
   theme: CustomTheme,
   url: string,
-    customJS: string,
-    customPaddingFunction: null | (padding: number) => string,
   collapsibleStack: Collapsible,
-    onMessage: Function,
+  onMessage: (event: {nativeEvent: {data: string}}) => void,
-    onScroll: Function,
+  onScroll: (event: SyntheticEvent<EventTarget>) => void,
-    showAdvancedControls: boolean,
+  customJS?: string,
-}
+  customPaddingFunction?: null | ((padding: number) => string),
+  showAdvancedControls?: boolean,
+};
 
 const AnimatedWebView = Animated.createAnimatedComponent(WebView);
 
 /**
  * Class defining a webview screen.
  */
-class WebViewScreen extends React.PureComponent<Props> {
+class WebViewScreen extends React.PureComponent<PropsType> {
-
   static defaultProps = {
     customJS: '',
     showAdvancedControls: true,
@@ -55,27 +58,24 @@ class WebViewScreen extends React.PureComponent<Props> {
    * Creates header buttons and listens to events after mounting
    */
   componentDidMount() {
-        this.props.navigation.setOptions({
+    const {props} = this;
-            headerRight: this.props.showAdvancedControls
+    props.navigation.setOptions({
+      headerRight: props.showAdvancedControls
         ? this.getAdvancedButtons
         : this.getBasicButton,
     });
-        this.props.navigation.addListener(
+    props.navigation.addListener('focus', () => {
-            'focus',
-            () =>
       BackHandler.addEventListener(
         'hardwareBackPress',
-                    this.onBackButtonPressAndroid
+        this.onBackButtonPressAndroid,
-                )
       );
-        this.props.navigation.addListener(
+    });
-            'blur',
+    props.navigation.addListener('blur', () => {
-            () =>
       BackHandler.removeEventListener(
         'hardwareBackPress',
-                    this.onBackButtonPressAndroid
+        this.onBackButtonPressAndroid,
-                )
       );
+    });
   }
 
   /**
@@ -83,7 +83,7 @@ class WebViewScreen extends React.PureComponent<Props> {
    *
    * @returns {boolean}
    */
-    onBackButtonPressAndroid = () => {
+  onBackButtonPressAndroid = (): boolean => {
     if (this.canGoBack) {
       this.onGoBackClicked();
       return true;
@@ -96,17 +96,19 @@ class WebViewScreen extends React.PureComponent<Props> {
    *
    * @return {*}
    */
-    getBasicButton = () => {
+  getBasicButton = (): React.Node => {
     return (
       <MaterialHeaderButtons>
         <Item
           title="refresh"
           iconName="refresh"
-                    onPress={this.onRefreshClicked}/>
+          onPress={this.onRefreshClicked}
+        />
         <Item
-                    title={i18n.t("general.openInBrowser")}
+          title={i18n.t('general.openInBrowser')}
           iconName="open-in-new"
-                    onPress={this.onOpenClicked}/>
+          onPress={this.onOpenClicked}
+        />
       </MaterialHeaderButtons>
     );
   };
@@ -117,7 +119,8 @@ class WebViewScreen extends React.PureComponent<Props> {
    *
    * @returns {*}
    */
-    getAdvancedButtons = () => {
+  getAdvancedButtons = (): React.Node => {
+    const {props} = this;
     return (
       <MaterialHeaderButtons>
         <Item
@@ -131,40 +134,74 @@ class WebViewScreen extends React.PureComponent<Props> {
             <MaterialCommunityIcons
               name="dots-vertical"
               size={26}
-                            color={this.props.theme.colors.text}
+              color={props.theme.colors.text}
-                        />}
+            />
-                >
+          }>
           <HiddenItem
-                        title={i18n.t("general.goBack")}
+            title={i18n.t('general.goBack')}
-                        onPress={this.onGoBackClicked}/>
+            onPress={this.onGoBackClicked}
+          />
           <HiddenItem
-                        title={i18n.t("general.goForward")}
+            title={i18n.t('general.goForward')}
-                        onPress={this.onGoForwardClicked}/>
+            onPress={this.onGoForwardClicked}
+          />
           <Divider />
           <HiddenItem
-                        title={i18n.t("general.openInBrowser")}
+            title={i18n.t('general.openInBrowser')}
-                        onPress={this.onOpenClicked}/>
+            onPress={this.onOpenClicked}
+          />
         </OverflowMenu>
       </MaterialHeaderButtons>
     );
+  };
+
+  /**
+   * Gets the loading indicator
+   *
+   * @return {*}
+   */
+  getRenderLoading = (): React.Node => <BasicLoadingScreen isAbsolute />;
+
+  /**
+   * Gets the javascript needed to generate a padding on top of the page
+   * This adds padding to the body and runs the custom padding function given in props
+   *
+   * @param padding The padding to add in pixels
+   * @returns {string}
+   */
+  getJavascriptPadding(padding: number): string {
+    const {props} = this;
+    const customPadding =
+      props.customPaddingFunction != null
+        ? props.customPaddingFunction(padding)
+        : '';
+    return `document.getElementsByTagName('body')[0].style.paddingTop = '${padding}px';${customPadding}true;`;
   }
 
   /**
    * Callback to use when refresh button is clicked. Reloads the webview.
    */
   onRefreshClicked = () => {
-        if (this.webviewRef.current != null)
+    if (this.webviewRef.current != null) this.webviewRef.current.reload();
-            this.webviewRef.current.reload();
+  };
-    }
+
   onGoBackClicked = () => {
-        if (this.webviewRef.current != null)
+    if (this.webviewRef.current != null) this.webviewRef.current.goBack();
-            this.webviewRef.current.goBack();
+  };
-    }
+
   onGoForwardClicked = () => {
-        if (this.webviewRef.current != null)
+    if (this.webviewRef.current != null) this.webviewRef.current.goForward();
-            this.webviewRef.current.goForward();
+  };
-    }
+
-    onOpenClicked = () => Linking.openURL(this.props.url);
+  onOpenClicked = () => {
+    const {url} = this.props;
+    Linking.openURL(url);
+  };
+
+  onScroll = (event: SyntheticEvent<EventTarget>) => {
+    const {onScroll} = this.props;
+    if (onScroll) onScroll(event);
+  };
 
   /**
    * Injects the given javascript string into the web page
@@ -174,55 +211,32 @@ class WebViewScreen extends React.PureComponent<Props> {
   injectJavaScript = (script: string) => {
     if (this.webviewRef.current != null)
       this.webviewRef.current.injectJavaScript(script);
-    }
+  };
 
-    /**
+  render(): React.Node {
-     * Gets the loading indicator
+    const {props} = this;
-     *
+    const {containerPaddingTop, onScrollWithListener} = props.collapsibleStack;
-     * @return {*}
-     */
-    getRenderLoading = () => <BasicLoadingScreen isAbsolute={true}/>;
-
-    /**
-     * Gets the javascript needed to generate a padding on top of the page
-     * This adds padding to the body and runs the custom padding function given in props
-     *
-     * @param padding The padding to add in pixels
-     * @returns {string}
-     */
-    getJavascriptPadding(padding: number) {
-        const customPadding = this.props.customPaddingFunction != null ? this.props.customPaddingFunction(padding) : "";
-        return (
-            "document.getElementsByTagName('body')[0].style.paddingTop = '" + padding + "px';" +
-            customPadding +
-            "true;"
-        );
-    }
-
-    onScroll = (event: Object) => {
-        if (this.props.onScroll)
-            this.props.onScroll(event);
-    }
-
-    render() {
-        const {containerPaddingTop, onScrollWithListener} = this.props.collapsibleStack;
     return (
       <AnimatedWebView
         ref={this.webviewRef}
-                source={{uri: this.props.url}}
+        source={{uri: props.url}}
-                startInLoadingState={true}
+        startInLoadingState
-                injectedJavaScript={this.props.customJS}
+        injectedJavaScript={props.customJS}
-                javaScriptEnabled={true}
+        javaScriptEnabled
         renderLoading={this.getRenderLoading}
-                renderError={() => <ErrorView
+        renderError={(): React.Node => (
+          <ErrorView
             errorCode={ERROR_TYPE.CONNECTION_ERROR}
             onRefresh={this.onRefreshClicked}
-                />}
+          />
-                onNavigationStateChange={navState => {
+        )}
+        onNavigationStateChange={(navState: {canGoBack: boolean}) => {
           this.canGoBack = navState.canGoBack;
         }}
-                onMessage={this.props.onMessage}
+        onMessage={props.onMessage}
-                onLoad={() => this.injectJavaScript(this.getJavascriptPadding(containerPaddingTop))}
+        onLoad={() => {
+          this.injectJavaScript(this.getJavascriptPadding(containerPaddingTop));
+        }}
         // Animations
         onScroll={onScrollWithListener(this.onScroll)}
       />