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Flow strict ScrollResponder (#22181)
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Summary:
Related to #22100

Enhance Flow types for Libraries/Components/ScrollResponder.js
Pull Request resolved: #22181

Reviewed By: TheSavior

Differential Revision: D13032699

Pulled By: RSNara

fbshipit-source-id: ca0ce178a96008a71016d033ee1154ad807d6599
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@saitoxu @facebook-github-bot
saitoxu authored and facebook-github-bot committed Nov 21, 2018
1 parent a97d104 commit fb4825a
Showing 1 changed file with 31 additions and 27 deletions.
58 changes: 31 additions & 27 deletions Libraries/Components/ScrollResponder.js
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Original file line number Diff line number Diff line change
Expand Up @@ -24,6 +24,8 @@ const warning = require('fbjs/lib/warning');

const {ScrollViewManager} = require('NativeModules');

import type {PressEvent, ScrollEvent} from 'CoreEventTypes';
import type {KeyboardEvent} from 'Keyboard';
import type EmitterSubscription from 'EmitterSubscription';

/**
Expand Down Expand Up @@ -113,7 +115,6 @@ type State = {
observedScrollSinceBecomingResponder: boolean,
becameResponderWhileAnimating: boolean,
};
type Event = Object;

const ScrollResponderMixin = {
_subscriptionKeyboardWillShow: (null: ?EmitterSubscription),
Expand Down Expand Up @@ -168,7 +169,9 @@ const ScrollResponderMixin = {
* true.
*
*/
scrollResponderHandleStartShouldSetResponder: function(e: Event): boolean {
scrollResponderHandleStartShouldSetResponder: function(
e: PressEvent,
): boolean {
const currentlyFocusedTextInput = TextInputState.currentlyFocusedField();

if (
Expand All @@ -193,7 +196,7 @@ const ScrollResponderMixin = {
* Invoke this from an `onStartShouldSetResponderCapture` event.
*/
scrollResponderHandleStartShouldSetResponderCapture: function(
e: Event,
e: PressEvent,
): boolean {
// The scroll view should receive taps instead of its descendants if:
// * it is already animating/decelerating
Expand All @@ -212,6 +215,7 @@ const ScrollResponderMixin = {
if (
keyboardNeverPersistTaps &&
currentlyFocusedTextInput != null &&
e.target &&
!TextInputState.isTextInput(e.target)
) {
return true;
Expand Down Expand Up @@ -254,9 +258,9 @@ const ScrollResponderMixin = {
/**
* Invoke this from an `onTouchEnd` event.
*
* @param {SyntheticEvent} e Event.
* @param {PressEvent} e Event.
*/
scrollResponderHandleTouchEnd: function(e: Event) {
scrollResponderHandleTouchEnd: function(e: PressEvent) {
const nativeEvent = e.nativeEvent;
this.state.isTouching = nativeEvent.touches.length !== 0;
this.props.onTouchEnd && this.props.onTouchEnd(e);
Expand All @@ -265,17 +269,17 @@ const ScrollResponderMixin = {
/**
* Invoke this from an `onTouchCancel` event.
*
* @param {SyntheticEvent} e Event.
* @param {PressEvent} e Event.
*/
scrollResponderHandleTouchCancel: function(e: Event) {
scrollResponderHandleTouchCancel: function(e: PressEvent) {
this.state.isTouching = false;
this.props.onTouchCancel && this.props.onTouchCancel(e);
},

/**
* Invoke this from an `onResponderRelease` event.
*/
scrollResponderHandleResponderRelease: function(e: Event) {
scrollResponderHandleResponderRelease: function(e: PressEvent) {
this.props.onResponderRelease && this.props.onResponderRelease(e);

// By default scroll views will unfocus a textField
Expand All @@ -295,15 +299,15 @@ const ScrollResponderMixin = {
}
},

scrollResponderHandleScroll: function(e: Event) {
scrollResponderHandleScroll: function(e: ScrollEvent) {
this.state.observedScrollSinceBecomingResponder = true;
this.props.onScroll && this.props.onScroll(e);
},

/**
* Invoke this from an `onResponderGrant` event.
*/
scrollResponderHandleResponderGrant: function(e: Event) {
scrollResponderHandleResponderGrant: function(e: ScrollEvent) {
this.state.observedScrollSinceBecomingResponder = false;
this.props.onResponderGrant && this.props.onResponderGrant(e);
this.state.becameResponderWhileAnimating = this.scrollResponderIsAnimating();
Expand All @@ -316,15 +320,15 @@ const ScrollResponderMixin = {
*
* Invoke this from an `onScrollBeginDrag` event.
*/
scrollResponderHandleScrollBeginDrag: function(e: Event) {
scrollResponderHandleScrollBeginDrag: function(e: ScrollEvent) {
FrameRateLogger.beginScroll(); // TODO: track all scrolls after implementing onScrollEndAnimation
this.props.onScrollBeginDrag && this.props.onScrollBeginDrag(e);
},

/**
* Invoke this from an `onScrollEndDrag` event.
*/
scrollResponderHandleScrollEndDrag: function(e: Event) {
scrollResponderHandleScrollEndDrag: function(e: ScrollEvent) {
const {velocity} = e.nativeEvent;
// - If we are animating, then this is a "drag" that is stopping the scrollview and momentum end
// will fire.
Expand All @@ -343,15 +347,15 @@ const ScrollResponderMixin = {
/**
* Invoke this from an `onMomentumScrollBegin` event.
*/
scrollResponderHandleMomentumScrollBegin: function(e: Event) {
scrollResponderHandleMomentumScrollBegin: function(e: ScrollEvent) {
this.state.lastMomentumScrollBeginTime = performanceNow();
this.props.onMomentumScrollBegin && this.props.onMomentumScrollBegin(e);
},

/**
* Invoke this from an `onMomentumScrollEnd` event.
*/
scrollResponderHandleMomentumScrollEnd: function(e: Event) {
scrollResponderHandleMomentumScrollEnd: function(e: ScrollEvent) {
FrameRateLogger.endScroll();
this.state.lastMomentumScrollEndTime = performanceNow();
this.props.onMomentumScrollEnd && this.props.onMomentumScrollEnd(e);
Expand All @@ -366,9 +370,9 @@ const ScrollResponderMixin = {
* responder). The `onResponderReject` won't fire in that case - it only
* fires when a *current* responder rejects our request.
*
* @param {SyntheticEvent} e Touch Start event.
* @param {PressEvent} e Touch Start event.
*/
scrollResponderHandleTouchStart: function(e: Event) {
scrollResponderHandleTouchStart: function(e: PressEvent) {
this.state.isTouching = true;
this.props.onTouchStart && this.props.onTouchStart(e);
},
Expand All @@ -382,9 +386,9 @@ const ScrollResponderMixin = {
* responder). The `onResponderReject` won't fire in that case - it only
* fires when a *current* responder rejects our request.
*
* @param {SyntheticEvent} e Touch Start event.
* @param {PressEvent} e Touch Start event.
*/
scrollResponderHandleTouchMove: function(e: Event) {
scrollResponderHandleTouchMove: function(e: PressEvent) {
this.props.onTouchMove && this.props.onTouchMove(e);
},

Expand All @@ -409,7 +413,7 @@ const ScrollResponderMixin = {
* Components can pass what node to use by defining a `getScrollableNode`
* function otherwise `this` is used.
*/
scrollResponderGetScrollableNode: function(): any {
scrollResponderGetScrollableNode: function(): ?number {
return this.getScrollableNode
? this.getScrollableNode()
: ReactNative.findNodeHandle(this);
Expand Down Expand Up @@ -527,14 +531,14 @@ const ScrollResponderMixin = {
* This method should be used as the callback to onFocus in a TextInputs'
* parent view. Note that any module using this mixin needs to return
* the parent view's ref in getScrollViewRef() in order to use this method.
* @param {any} nodeHandle The TextInput node handle
* @param {number} nodeHandle The TextInput node handle
* @param {number} additionalOffset The scroll view's bottom "contentInset".
* Default is 0.
* @param {bool} preventNegativeScrolling Whether to allow pulling the content
* down to make it meet the keyboard's top. Default is false.
*/
scrollResponderScrollNativeHandleToKeyboard: function(
nodeHandle: any,
nodeHandle: number,
additionalOffset?: number,
preventNegativeScrollOffset?: boolean,
) {
Expand Down Expand Up @@ -584,8 +588,8 @@ const ScrollResponderMixin = {
this.preventNegativeScrollOffset = false;
},

scrollResponderTextInputFocusError: function(e: Event) {
console.error('Error measuring text field: ', e);
scrollResponderTextInputFocusError: function(msg: string) {
console.error('Error measuring text field: ', msg);
},

/**
Expand Down Expand Up @@ -667,17 +671,17 @@ const ScrollResponderMixin = {
* relevant to you. (For example, only if you receive these callbacks after
* you had explicitly focused a node etc).
*/
scrollResponderKeyboardWillShow: function(e: Event) {
scrollResponderKeyboardWillShow: function(e: KeyboardEvent) {
this.keyboardWillOpenTo = e;
this.props.onKeyboardWillShow && this.props.onKeyboardWillShow(e);
},

scrollResponderKeyboardWillHide: function(e: Event) {
scrollResponderKeyboardWillHide: function(e: KeyboardEvent) {
this.keyboardWillOpenTo = null;
this.props.onKeyboardWillHide && this.props.onKeyboardWillHide(e);
},

scrollResponderKeyboardDidShow: function(e: Event) {
scrollResponderKeyboardDidShow: function(e: KeyboardEvent) {
// TODO(7693961): The event for DidShow is not available on iOS yet.
// Use the one from WillShow and do not assign.
if (e) {
Expand All @@ -686,7 +690,7 @@ const ScrollResponderMixin = {
this.props.onKeyboardDidShow && this.props.onKeyboardDidShow(e);
},

scrollResponderKeyboardDidHide: function(e: Event) {
scrollResponderKeyboardDidHide: function(e: KeyboardEvent) {
this.keyboardWillOpenTo = null;
this.props.onKeyboardDidHide && this.props.onKeyboardDidHide(e);
},
Expand Down

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