Make ScrollView use ForwardRef
Summary: Have ScrollView use forwardRef so that the host component methods like `measure` and `measureLayout` are available without having to call `getNativeScrollRef`. Instead, you can use `<ScrollView ref={myRef} />` and directly call all methods of ScrollView and host components on `myRef`. Previous usage: ``` const myRef = React.createRef<React.ElementRef<typeof ScrollView>>(); <ScrollView ref={myRef} /> const innerViewRef = myRef.current.getNativeScrollRef(); innerViewRef.measure(); ``` New usage: ``` const myRef = React.createRef<React.ElementRef<typeof View>>(); <ScrollView ref={myRef} /> // now, myRef.current can be used directly as the ref myRef.current.measure(); myRef.current.measureLayout(); // Additionally, myRef still has access to ScrollView methods myRef.current.scrollTo(...); ``` Changes: * Added deprecation warnings to ScrollView methods `getNativeScrollRef`, `getScrollableNode`, and `getScrollResponder` * Added the forwardRef call to create `ForwardedScrollView` - this takes in `ref` and passes it into the class ScrollView as `scrollViewRef`. * Forwarded the ref to the native scroll view using `setAndForwardRef`. * Added statics onto `ForwardedScrollView` so that `ScrollView.Context` can still be accessed. * Added type `ScrollViewImperativeMethods`, which lists the public methods of ScrollView. * Converted all public methods of ScrollView to arrow functions. This is because they need to be bound to the forwarded ref. * Bound all public methods of ScrollView to the forwarded ref in the `setAndForwardRef` call. * Flow typed the final output (ForwardedScrollView) as an abstract component that takes in the props of the `ScrollView` class, and has all methods of both the inner host component (`measure`, `measureLayout`, etc) and the public methods (`scrollTo`, etc). Changes to mockScrollView: * Changed mockScrollView to be able to mock the function component instead of a class component * Updated necessary tests Changelog: [General] [Changed] - Make ScrollView use forwardRef Reviewed By: TheSavior Differential Revision: D19304480 fbshipit-source-id: 6c359897526d9d5ac6bc6ab6d5f9d82bfc0d8af4
This commit is contained in:
Родитель
93ee5b2cc8
Коммит
d2f314af75
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@ -62,20 +62,29 @@ if (Platform.OS === 'android') {
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RCTScrollContentView = ScrollContentViewNativeComponent;
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}
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export type ScrollResponderType = {
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// We'd like to do ...ScrollView here, however Flow doesn't seem
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// to see the imperative methods of ScrollView that way. Workaround the
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// issue by specifying them manually.
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// Public methods for ScrollView
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export type ScrollViewImperativeMethods = $ReadOnly<{|
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getScrollResponder: $PropertyType<ScrollView, 'getScrollResponder'>,
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getScrollableNode: $PropertyType<ScrollView, 'getScrollableNode'>,
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getInnerViewNode: $PropertyType<ScrollView, 'getInnerViewNode'>,
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getInnerViewRef: $PropertyType<ScrollView, 'getInnerViewRef'>,
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getNativeScrollRef: $PropertyType<ScrollView, 'getNativeScrollRef'>,
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setNativeProps: $PropertyType<ScrollView, 'setNativeProps'>,
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scrollTo: $PropertyType<ScrollView, 'scrollTo'>,
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scrollToEnd: $PropertyType<ScrollView, 'scrollToEnd'>,
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flashScrollIndicators: $PropertyType<ScrollView, 'flashScrollIndicators'>,
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...typeof ScrollResponder.Mixin,
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...
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};
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// ScrollResponder.Mixin public methods
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scrollResponderZoomTo: $PropertyType<
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typeof ScrollResponder.Mixin,
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'scrollResponderZoomTo',
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>,
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scrollResponderScrollNativeHandleToKeyboard: $PropertyType<
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typeof ScrollResponder.Mixin,
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'scrollResponderScrollNativeHandleToKeyboard',
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>,
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|}>;
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export type ScrollResponderType = ScrollViewImperativeMethods;
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type IOSProps = $ReadOnly<{|
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/**
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@ -581,6 +590,14 @@ export type Props = $ReadOnly<{|
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* instead of calling `getInnerViewRef`.
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*/
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innerViewRef?: React.Ref<typeof View>,
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/**
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* A ref to the Native ScrollView component. This ref can be used to call
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* all of ScrollView's public methods, in addition to native methods like
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* measure, measureLayout, etc.
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*/
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scrollViewRef?: React.Ref<
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typeof ScrollViewNativeComponent & ScrollViewImperativeMethods,
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>,
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|}>;
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type State = {|
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@ -603,11 +620,14 @@ function createScrollResponder(
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}
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type ContextType = {|horizontal: boolean|} | null;
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const Context = React.createContext<ContextType>(null);
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const Context: React.Context<ContextType> = React.createContext(null);
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const standardHorizontalContext: ContextType = Object.freeze({
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horizontal: true,
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});
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const standardVerticalContext: ContextType = Object.freeze({horizontal: false});
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type ScrollViewComponentStatics = $ReadOnly<{|
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Context: typeof Context,
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|}>;
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/**
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* Component that wraps platform ScrollView while providing
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@ -750,9 +770,37 @@ class ScrollView extends React.Component<Props, State> {
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}
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}
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setNativeProps(props: {[key: string]: mixed, ...}) {
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this._scrollViewRef && this._scrollViewRef.setNativeProps(props);
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}
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_setNativeRef = setAndForwardRef({
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getForwardedRef: () => this.props.scrollViewRef,
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setLocalRef: ref => {
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this._scrollViewRef = ref;
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/*
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This is a hack. Ideally we would forwardRef to the underlying
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host component. However, since ScrollView has it's own methods that can be
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called as well, if we used the standard forwardRef then these
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methods wouldn't be accessible and thus be a breaking change.
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Therefore we edit ref to include ScrollView's public methods so that
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they are callable from the ref.
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*/
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if (ref) {
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ref.getScrollResponder = this.getScrollResponder;
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ref.getScrollableNode = this.getScrollableNode;
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ref.getInnerViewNode = this.getInnerViewNode;
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ref.getInnerViewRef = this.getInnerViewRef;
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ref.getNativeScrollRef = this.getNativeScrollRef;
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ref.scrollTo = this.scrollTo;
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ref.scrollToEnd = this.scrollToEnd;
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ref.flashScrollIndicators = this.flashScrollIndicators;
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// $FlowFixMe - This method was manually bound from ScrollResponder.mixin
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ref.scrollResponderZoomTo = this.scrollResponderZoomTo;
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// $FlowFixMe - This method was manually bound from ScrollResponder.mixin
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ref.scrollResponderScrollNativeHandleToKeyboard = this.scrollResponderScrollNativeHandleToKeyboard;
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}
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},
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});
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/**
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* Returns a reference to the underlying scroll responder, which supports
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@ -760,14 +808,26 @@ class ScrollView extends React.Component<Props, State> {
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* implement this method so that they can be composed while providing access
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* to the underlying scroll responder's methods.
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*/
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getScrollResponder(): ScrollResponderType {
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getScrollResponder: () => ScrollResponderType = () => {
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if (__DEV__) {
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console.warn(
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'`getScrollResponder()` is deprecated. This will be removed in a future release. ' +
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'Use <ScrollView ref={myRef} /> instead.',
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);
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}
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// $FlowFixMe - overriding type to include ScrollResponder.Mixin
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return ((this: any): ScrollResponderType);
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}
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};
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getScrollableNode(): ?number {
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getScrollableNode: () => ?number = () => {
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if (__DEV__) {
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console.warn(
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'`getScrollableNode()` is deprecated. This will be removed in a future release. ' +
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'Use <ScrollView ref={myRef} /> instead.',
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);
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}
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return ReactNative.findNodeHandle(this._scrollViewRef);
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}
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};
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getInnerViewNode(): ?number {
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console.warn(
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@ -785,9 +845,15 @@ class ScrollView extends React.Component<Props, State> {
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return this._innerViewRef;
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}
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getNativeScrollRef(): ?React.ElementRef<HostComponent<mixed>> {
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getNativeScrollRef: () => ?React.ElementRef<HostComponent<mixed>> = () => {
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if (__DEV__) {
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console.warn(
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'`getNativeScrollRef()` is deprecated. This will be removed in a future release. ' +
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'Use <ScrollView ref={myRef} /> instead.',
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);
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}
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return this._scrollViewRef;
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}
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};
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/**
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* Scrolls to a given x, y offset, either immediately or with a smooth animation.
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@ -800,7 +866,7 @@ class ScrollView extends React.Component<Props, State> {
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* the function also accepts separate arguments as an alternative to the options object.
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* This is deprecated due to ambiguity (y before x), and SHOULD NOT BE USED.
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*/
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scrollTo(
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scrollTo: (
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options?:
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| {
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x?: number,
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@ -811,7 +877,18 @@ class ScrollView extends React.Component<Props, State> {
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| number,
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deprecatedX?: number,
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deprecatedAnimated?: boolean,
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) {
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) => void = (
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options?:
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| {
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x?: number,
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y?: number,
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animated?: boolean,
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...
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}
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| number,
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deprecatedX?: number,
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deprecatedAnimated?: boolean,
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) => {
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let x, y, animated;
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if (typeof options === 'number') {
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console.warn(
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@ -831,7 +908,7 @@ class ScrollView extends React.Component<Props, State> {
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y: y || 0,
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animated: animated !== false,
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});
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}
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};
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/**
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* If this is a vertical ScrollView scrolls to the bottom.
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@ -841,22 +918,24 @@ class ScrollView extends React.Component<Props, State> {
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* `scrollToEnd({animated: false})` for immediate scrolling.
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* If no options are passed, `animated` defaults to true.
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*/
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scrollToEnd(options?: ?{animated?: boolean, ...}) {
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scrollToEnd: (options?: ?{animated?: boolean, ...}) => void = (
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options?: ?{animated?: boolean, ...},
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) => {
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// Default to true
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const animated = (options && options.animated) !== false;
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this._scrollResponder.scrollResponderScrollToEnd({
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animated: animated,
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});
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}
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};
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/**
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* Displays the scroll indicators momentarily.
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*
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* @platform ios
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*/
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flashScrollIndicators() {
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flashScrollIndicators: () => void = () => {
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this._scrollResponder.scrollResponderFlashScrollIndicators();
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}
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};
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_getKeyForIndex(index, childArray) {
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const child = childArray[index];
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|
@ -959,9 +1038,6 @@ class ScrollView extends React.Component<Props, State> {
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};
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_scrollViewRef: ?React.ElementRef<HostComponent<mixed>> = null;
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_setScrollViewRef = (ref: ?React.ElementRef<HostComponent<mixed>>) => {
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this._scrollViewRef = ref;
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};
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_innerViewRef: ?React.ElementRef<typeof View> = null;
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_setInnerViewRef = setAndForwardRef({
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|
@ -1182,7 +1258,7 @@ class ScrollView extends React.Component<Props, State> {
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/* $FlowFixMe(>=0.117.0 site=react_native_fb) This comment suppresses
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* an error found when Flow v0.117 was deployed. To see the error,
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* delete this comment and run Flow. */
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<ScrollViewClass {...props} ref={this._setScrollViewRef}>
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<ScrollViewClass {...props} ref={this._setNativeRef}>
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{Platform.isTV ? null : refreshControl}
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{contentContainer}
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</ScrollViewClass>
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@ -1200,14 +1276,14 @@ class ScrollView extends React.Component<Props, State> {
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<ScrollViewClass
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{...props}
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style={[baseStyle, inner]}
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ref={this._setScrollViewRef}>
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ref={this._setNativeRef}>
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{contentContainer}
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</ScrollViewClass>,
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);
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}
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}
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return (
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<ScrollViewClass {...props} ref={this._setScrollViewRef}>
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<ScrollViewClass {...props} ref={this._setNativeRef}>
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{contentContainer}
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</ScrollViewClass>
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);
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@ -1232,4 +1308,22 @@ const styles = StyleSheet.create({
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},
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});
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module.exports = ScrollView;
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function Wrapper(props, ref) {
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return <ScrollView {...props} scrollViewRef={ref} />;
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}
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Wrapper.displayName = 'ScrollView';
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const ForwardedScrollView = React.forwardRef(Wrapper);
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// $FlowFixMe Add static context to ForwardedScrollView
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ForwardedScrollView.Context = Context;
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ForwardedScrollView.displayName = 'ScrollView';
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module.exports = ((ForwardedScrollView: $FlowFixMe): React.AbstractComponent<
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React.ElementConfig<typeof ScrollView>,
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$ReadOnly<{|
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...$Exact<React.ElementRef<HostComponent<mixed>>>,
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...ScrollViewImperativeMethods,
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|}>,
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> &
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ScrollViewComponentStatics);
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|
|
|
@ -1,39 +0,0 @@
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/**
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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* @format
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* @flow strict-local
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*/
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/* eslint-env jest */
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'use strict';
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const React = require('react');
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const View = require('../../View/View');
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const requireNativeComponent = require('../../../ReactNative/requireNativeComponent');
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import type {HostComponent} from '../../../Renderer/shims/ReactNativeTypes';
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const RCTScrollView: HostComponent<mixed> = requireNativeComponent<mixed>(
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'RCTScrollView',
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);
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const ScrollViewComponent: $FlowFixMe = jest.genMockFromModule('../ScrollView');
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class ScrollViewMock extends ScrollViewComponent {
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render(): React.Element<typeof RCTScrollView> {
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return (
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<RCTScrollView {...this.props}>
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{this.props.refreshControl}
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<View>{this.props.children}</View>
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</RCTScrollView>
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);
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}
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}
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module.exports = ScrollViewMock;
|
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@ -6,7 +6,7 @@
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*
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* @format
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* @emails oncall+react_native
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* @flow strict-local
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* @flow-strict
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*/
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'use strict';
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|
@ -14,6 +14,7 @@
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const React = require('react');
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const ScrollView = require('../ScrollView');
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const ReactNativeTestTools = require('../../../Utilities/ReactNativeTestTools');
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const ReactTestRenderer = require('react-test-renderer');
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const View = require('../../View/View');
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const Text = require('../../../Text/Text');
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|
@ -33,4 +34,18 @@ describe('<ScrollView />', () => {
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},
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);
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});
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it('should mock native methods and instance methods when mocked', () => {
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jest.resetModules();
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jest.mock('../ScrollView');
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const ref = React.createRef();
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ReactTestRenderer.create(<ScrollView ref={ref} />);
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expect(ref.current != null && ref.current.measure).toBeInstanceOf(
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jest.fn().constructor,
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);
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expect(ref.current != null && ref.current.scrollTo).toBeInstanceOf(
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jest.fn().constructor,
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);
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});
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});
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|
|
|
@ -36,6 +36,7 @@ exports[`<ScrollView /> should render as expected: should deep render when not m
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onTouchStart={[Function]}
|
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pagingEnabled={false}
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scrollBarThumbImage={null}
|
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scrollViewRef={null}
|
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sendMomentumEvents={false}
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snapToEnd={true}
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snapToStart={true}
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|
@ -70,21 +71,21 @@ exports[`<ScrollView /> should render as expected: should deep render when not m
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`;
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exports[`<ScrollView /> should render as expected: should shallow render as <ScrollView /> when mocked 1`] = `
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<ScrollView>
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<ForwardRef(ScrollView)>
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<View>
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<Text>
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Hello World!
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</Text>
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</View>
|
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</ScrollView>
|
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</ForwardRef(ScrollView)>
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`;
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exports[`<ScrollView /> should render as expected: should shallow render as <ScrollView /> when not mocked 1`] = `
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<ScrollView>
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<ForwardRef(ScrollView)>
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<View>
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<Text>
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Hello World!
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</Text>
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</View>
|
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</ScrollView>
|
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</ForwardRef(ScrollView)>
|
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`;
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|
|
|
@ -19,10 +19,8 @@ const StyleSheet = require('../StyleSheet/StyleSheet');
|
|||
|
||||
const invariant = require('invariant');
|
||||
|
||||
import ScrollView, {
|
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type ScrollResponderType,
|
||||
} from '../Components/ScrollView/ScrollView';
|
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import type {ScrollViewNativeComponentType} from '../Components/ScrollView/ScrollViewNativeComponentType';
|
||||
import {type ScrollResponderType} from '../Components/ScrollView/ScrollView';
|
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import type {ScrollViewNativeComponentType} from '../Components/ScrollView/ScrollViewNativeComponentType.js';
|
||||
import type {ViewStyleProp} from '../StyleSheet/StyleSheet';
|
||||
import type {
|
||||
ViewToken,
|
||||
|
@ -377,14 +375,7 @@ class FlatList<ItemT> extends React.PureComponent<Props<ItemT>, void> {
|
|||
| ?React.ElementRef<typeof View>
|
||||
| ?React.ElementRef<ScrollViewNativeComponentType> {
|
||||
if (this._listRef) {
|
||||
const scrollRef = this._listRef.getScrollRef();
|
||||
if (scrollRef != null) {
|
||||
if (scrollRef instanceof ScrollView) {
|
||||
return scrollRef.getNativeScrollRef();
|
||||
} else {
|
||||
return scrollRef;
|
||||
}
|
||||
}
|
||||
return this._listRef.getScrollRef();
|
||||
}
|
||||
}
|
||||
|
||||
|
|
|
@ -1397,10 +1397,7 @@ class VirtualizedList extends React.PureComponent<Props, State> {
|
|||
// We are assuming that getOutermostParentListRef().getScrollRef()
|
||||
// is a non-null reference to a ScrollView
|
||||
this._scrollRef.measureLayout(
|
||||
this.context.virtualizedList
|
||||
.getOutermostParentListRef()
|
||||
.getScrollRef()
|
||||
.getNativeScrollRef(),
|
||||
this.context.virtualizedList.getOutermostParentListRef().getScrollRef(),
|
||||
(x, y, width, height) => {
|
||||
this._offsetFromParentVirtualizedList = this._selectOffset({x, y});
|
||||
this._scrollMetrics.contentLength = this._selectLength({
|
||||
|
|
|
@ -300,7 +300,7 @@ describe('VirtualizedList', () => {
|
|||
|
||||
// This is checking if the ref acts like a ScrollView. If we had an
|
||||
// `isScrollView(ref)` method, that would be preferred.
|
||||
expect(scrollRef.scrollTo).toBeInstanceOf(Function);
|
||||
expect(scrollRef.scrollTo).toBeInstanceOf(jest.fn().constructor);
|
||||
});
|
||||
|
||||
it('getScrollRef for case where it returns a View', () => {
|
||||
|
|
|
@ -25,7 +25,7 @@ exports[`LogBoxInspectorCodeFrame should render a code frame 1`] = `
|
|||
}
|
||||
}
|
||||
>
|
||||
<ScrollViewMock
|
||||
<ScrollView
|
||||
horizontal={true}
|
||||
>
|
||||
<Ansi
|
||||
|
@ -44,7 +44,7 @@ exports[`LogBoxInspectorCodeFrame should render a code frame 1`] = `
|
|||
| ^
|
||||
200 |"
|
||||
/>
|
||||
</ScrollViewMock>
|
||||
</ScrollView>
|
||||
</View>
|
||||
<LogBoxButton
|
||||
backgroundColor={
|
||||
|
@ -107,7 +107,7 @@ exports[`LogBoxInspectorCodeFrame should render a code frame without a location
|
|||
}
|
||||
}
|
||||
>
|
||||
<ScrollViewMock
|
||||
<ScrollView
|
||||
horizontal={true}
|
||||
>
|
||||
<Ansi
|
||||
|
@ -126,7 +126,7 @@ exports[`LogBoxInspectorCodeFrame should render a code frame without a location
|
|||
| ^
|
||||
200 |"
|
||||
/>
|
||||
</ScrollViewMock>
|
||||
</ScrollView>
|
||||
</View>
|
||||
<LogBoxButton
|
||||
backgroundColor={
|
||||
|
|
|
@ -0,0 +1,35 @@
|
|||
/**
|
||||
* Copyright (c) Facebook, Inc. and its affiliates.
|
||||
*
|
||||
* This source code is licensed under the MIT license found in the
|
||||
* LICENSE file in the root directory of this source tree.
|
||||
*
|
||||
* @format
|
||||
* @flow strict-local
|
||||
*/
|
||||
|
||||
/* eslint-env jest */
|
||||
|
||||
'use strict';
|
||||
|
||||
const React = require('react');
|
||||
const View = require('../Libraries/Components/View/View');
|
||||
|
||||
const requireNativeComponent = require('../Libraries/ReactNative/requireNativeComponent');
|
||||
const RCTScrollView: $FlowFixMe = requireNativeComponent('RCTScrollView');
|
||||
|
||||
function mockScrollView(BaseComponent: $FlowFixMe) {
|
||||
class ScrollViewMock extends BaseComponent {
|
||||
render(): React.Element<typeof RCTScrollView> {
|
||||
return (
|
||||
<RCTScrollView {...this.props}>
|
||||
{this.props.refreshControl}
|
||||
<View>{this.props.children}</View>
|
||||
</RCTScrollView>
|
||||
);
|
||||
}
|
||||
}
|
||||
return ScrollViewMock;
|
||||
}
|
||||
|
||||
module.exports = (mockScrollView: $FlowFixMe);
|
|
@ -126,11 +126,26 @@ jest
|
|||
'../Libraries/Components/RefreshControl/__mocks__/RefreshControlMock',
|
||||
),
|
||||
)
|
||||
.mock('../Libraries/Components/ScrollView/ScrollView', () =>
|
||||
jest.requireActual(
|
||||
'../Libraries/Components/ScrollView/__mocks__/ScrollViewMock',
|
||||
),
|
||||
)
|
||||
.mock('../Libraries/Components/ScrollView/ScrollView', () => {
|
||||
const baseComponent = mockComponent(
|
||||
'../Libraries/Components/ScrollView/ScrollView',
|
||||
{
|
||||
...MockNativeMethods,
|
||||
getScrollResponder: jest.fn(),
|
||||
getScrollableNode: jest.fn(),
|
||||
getInnerViewNode: jest.fn(),
|
||||
getInnerViewRef: jest.fn(),
|
||||
getNativeScrollRef: jest.fn(),
|
||||
scrollTo: jest.fn(),
|
||||
scrollToEnd: jest.fn(),
|
||||
flashScrollIndicators: jest.fn(),
|
||||
scrollResponderZoomTo: jest.fn(),
|
||||
scrollResponderScrollNativeHandleToKeyboard: jest.fn(),
|
||||
},
|
||||
);
|
||||
const mockScrollView = jest.requireActual('./mockScrollView');
|
||||
return mockScrollView(baseComponent);
|
||||
})
|
||||
.mock('../Libraries/Components/ActivityIndicator/ActivityIndicator', () =>
|
||||
mockComponent(
|
||||
'../Libraries/Components/ActivityIndicator/ActivityIndicator',
|
||||
|
|
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