RN: Replace `context.isInAParentText` w/ React.createContext

Reviewed By: sahrens

Differential Revision: D7895382

fbshipit-source-id: 4affcecd147b8e8c506e0d94f223bac3e6dfdf66

Libraries/Components/TextInput/TextInput.js

@@ -20,6 +20,7 @@ const PropTypes = require('prop-types');
 const ReactNative = require('ReactNative');
 const StyleSheet = require('StyleSheet');
 const Text = require('Text');
+const TextAncestor = require('TextAncestor');
 const TextInputState = require('TextInputState');
 /* $FlowFixMe(>=0.54.0 site=react_native_oss) This comment suppresses an error
  * found when Flow v0.54 was deployed. To see the error delete this comment and
@@ -28,7 +29,6 @@ const TimerMixin = require('react-timer-mixin');
 const TouchableWithoutFeedback = require('TouchableWithoutFeedback');
 const UIManager = require('UIManager');
 const ViewPropTypes = require('ViewPropTypes');
-const {ViewContextTypes} = require('ViewContext');
 
 const emptyFunction = require('fbjs/lib/emptyFunction');
 const invariant = require('fbjs/lib/invariant');
@@ -47,8 +47,6 @@ const onlyMultiline = {
   children: true,
 };
 
-import type {ViewChildContext} from 'ViewContext';
-
 if (Platform.OS === 'android') {
   AndroidTextInput = requireNativeComponent('AndroidTextInput', null);
 } else if (Platform.OS === 'ios') {
@@ -701,16 +699,7 @@ const TextInput = createReactClass({
     }
   },
 
-  getChildContext(): ViewChildContext {
-    return {
-      isInAParentText: true,
-    };
-  },
-
-  childContextTypes: ViewContextTypes,
-
   contextTypes: {
-    ...ViewContextTypes,
     onFocusRequested: PropTypes.func,
     focusEmitter: PropTypes.instanceOf(EventEmitter),
   },
@@ -723,13 +712,17 @@ const TextInput = createReactClass({
   },
 
   render: function() {
+    let textInput;
     if (Platform.OS === 'ios') {
-      return UIManager.RCTVirtualText
+      textInput = UIManager.RCTVirtualText
         ? this._renderIOS()
         : this._renderIOSLegacy();
     } else if (Platform.OS === 'android') {
-      return this._renderAndroid();
+      textInput = this._renderAndroid();
     }
+    return (
+      <TextAncestor.Provider value={true}>{textInput}</TextAncestor.Provider>
+    );
   },
 
   _getText: function(): ?string {

Libraries/Components/View/View.js

@@ -7,6 +7,7 @@
  * @flow
  * @format
  */
+
 'use strict';
 
 const Platform = require('Platform');
@@ -14,13 +15,13 @@ const React = require('React');
 const ReactNative = require('ReactNative');
 const ReactNativeStyleAttributes = require('ReactNativeStyleAttributes');
 const ReactNativeViewAttributes = require('ReactNativeViewAttributes');
+const TextAncestor = require('TextAncestor');
 const ViewPropTypes = require('ViewPropTypes');
-const {ViewContextTypes} = require('ViewContext');
+
 const invariant = require('fbjs/lib/invariant');
 const requireNativeComponent = require('requireNativeComponent');
 
 import type {ViewProps} from 'ViewPropTypes';
-import type {ViewChildContext} from 'ViewContext';
 
 export type Props = ViewProps;
 
@@ -33,30 +34,31 @@ export type Props = ViewProps;
  */
 class View extends ReactNative.NativeComponent<Props> {
   static propTypes = ViewPropTypes;
-  static childContextTypes = ViewContextTypes;
 
   viewConfig = {
     uiViewClassName: 'RCTView',
     validAttributes: ReactNativeViewAttributes.RCTView,
   };
 
-  getChildContext(): ViewChildContext {
+  /**
-    return {
+   * WARNING: This method will not be used in production mode as in that mode we
-      isInAParentText: false,
+   * replace wrapper component View with generated native wrapper RCTView. Avoid
-    };
+   * adding functionality this component that you'd want to be available in both
-  }
+   * dev and prod modes.
-
+   */
   render() {
+    return (
+      <TextAncestor.Consumer>
+        {hasTextAncestor => {
+          // TODO: Change iOS to behave the same as Android.
           invariant(
-      !(this.context.isInAParentText && Platform.OS === 'android'),
+            !hasTextAncestor || Platform.OS !== 'android',
             'Nesting of <View> within <Text> is not supported on Android.',
           );
-
-    // WARNING: This method will not be used in production mode as in that mode we
-    // replace wrapper component View with generated native wrapper RCTView. Avoid
-    // adding functionality this component that you'd want to be available in both
-    // dev and prod modes.
           return <RCTView {...this.props} />;
+        }}
+      </TextAncestor.Consumer>
+    );
   }
 }
 

Libraries/Image/Image.android.js

@@ -7,6 +7,7 @@
  * @flow
  * @format
  */
+
 'use strict';
 
 var ImageResizeMode = require('ImageResizeMode');
@@ -18,6 +19,7 @@ var PropTypes = require('prop-types');
 var ReactNativeViewAttributes = require('ReactNativeViewAttributes');
 var StyleSheet = require('StyleSheet');
 var StyleSheetPropType = require('StyleSheetPropType');
+const TextAncestor = require('TextAncestor');
 var ViewPropTypes = require('ViewPropTypes');
 
 var createReactClass = require('create-react-class');
@@ -26,8 +28,6 @@ var merge = require('merge');
 var requireNativeComponent = require('requireNativeComponent');
 var resolveAssetSource = require('resolveAssetSource');
 
-const {ViewContextTypes} = require('ViewContext');
-
 var {ImageLoader} = NativeModules;
 
 let _requestId = 1;
@@ -202,8 +202,6 @@ var Image = createReactClass({
     validAttributes: ReactNativeViewAttributes.RCTView,
   },
 
-  contextTypes: ViewContextTypes,
-
   render: function() {
     const source = resolveAssetSource(this.props.source);
     const defaultSource = resolveAssetSource(this.props.defaultSource);
@@ -236,7 +234,10 @@ var Image = createReactClass({
       );
     }
 
-    if (source && (source.uri || Array.isArray(source))) {
+    if (!source || (!source.uri && !Array.isArray(source))) {
+      return null;
+    }
+
     let style;
     let sources;
     if (source.uri) {
@@ -251,12 +252,7 @@ var Image = createReactClass({
     const {onLoadStart, onLoad, onLoadEnd, onError} = this.props;
     const nativeProps = merge(this.props, {
       style,
-        shouldNotifyLoadEvents: !!(
+      shouldNotifyLoadEvents: !!(onLoadStart || onLoad || onLoadEnd || onError),
-          onLoadStart ||
-          onLoad ||
-          onLoadEnd ||
-          onError
-        ),
       src: sources,
       headers: source.headers,
       defaultSrc: defaultSource ? defaultSource.uri : null,
@@ -265,13 +261,17 @@ var Image = createReactClass({
         : null,
     });
 
-      if (this.context.isInAParentText) {
+    return (
-        return <RCTTextInlineImage {...nativeProps} />;
+      <TextAncestor.Consumer>
-      } else {
+        {hasTextAncestor =>
-        return <RKImage {...nativeProps} />;
+          hasTextAncestor ? (
+            <RCTTextInlineImage {...nativeProps} />
+          ) : (
+            <RKImage {...nativeProps} />
+          )
         }
-    }
+      </TextAncestor.Consumer>
-    return null;
+    );
   },
 });
 

Libraries/Text/Text.js

@@ -12,6 +12,7 @@
 const React = require('React');
 const ReactNative = require('ReactNative');
 const ReactNativeViewAttributes = require('ReactNativeViewAttributes');
+const TextAncestor = require('TextAncestor');
 const TextPropTypes = require('TextPropTypes');
 const Touchable = require('Touchable');
 const UIManager = require('UIManager');
@@ -19,11 +20,9 @@ const UIManager = require('UIManager');
 const createReactNativeComponentClass = require('createReactNativeComponentClass');
 const mergeFast = require('mergeFast');
 const processColor = require('processColor');
-const {ViewContextTypes} = require('ViewContext');
 
 import type {PressEvent} from 'CoreEventTypes';
 import type {TextProps} from 'TextProps';
-import type {ViewChildContext} from 'ViewContext';
 
 type State = {
   isHighlighted: boolean,
@@ -61,8 +60,6 @@ const viewConfig = {
  */
 class Text extends ReactNative.NativeComponent<TextProps, State> {
   static propTypes = TextPropTypes;
-  static childContextTypes = ViewContextTypes;
-  static contextTypes = ViewContextTypes;
 
   static defaultProps = {
     accessible: true,
@@ -76,12 +73,6 @@ class Text extends ReactNative.NativeComponent<TextProps, State> {
 
   viewConfig = viewConfig;
 
-  getChildContext(): ViewChildContext {
-    return {
-      isInAParentText: true,
-    };
-  }
-
   _handlers: ?Object;
 
   _hasPressHandler(): boolean {
@@ -215,11 +206,19 @@ class Text extends ReactNative.NativeComponent<TextProps, State> {
         style: [this.props.style, {color: 'magenta'}],
       };
     }
-    if (this.context.isInAParentText) {
+    return (
-      return <RCTVirtualText {...newProps} />;
+      <TextAncestor.Consumer>
-    } else {
+        {hasTextAncestor =>
-      return <RCTText {...newProps} />;
+          hasTextAncestor ? (
+            <RCTVirtualText {...newProps} />
+          ) : (
+            <TextAncestor.Provider value={true}>
+              <RCTText {...newProps} />
+            </TextAncestor.Provider>
+          )
         }
+      </TextAncestor.Consumer>
+    );
   }
 }
 

Libraries/Text/TextAncestor.js

@@ -7,16 +7,12 @@
  * @flow
  * @format
  */
+
 'use strict';
 
-const PropTypes = require('prop-types');
+const React = require('React');
 
-export type ViewChildContext = {|
+/**
-  +isInAParentText: boolean,
+ * Whether the current element is the descendant of a <Text> element.
-|};
+ */
-
+module.exports = React.createContext(false);
-module.exports = {
-  ViewContextTypes: {
-    isInAParentText: PropTypes.bool,
-  },
-};