React Native Swipe Gestures not working in android - react-native

I'am facing a problem with swipe gestures not responding in android as I'am using react-native swipe gestures. It works fine in IOS. Below is the source code for the same.
constructor(props, context) {
super(props, context);
this.swipeConfig = Object.assign(swipeConfig, props.config);
}
componentWillReceiveProps(props) {
this.swipeConfig = Object.assign(swipeConfig, props.config);
}
componentWillMount() {
const responderEnd = this._handlePanResponderEnd.bind(this);
const shouldSetResponder = this._handleShouldSetPanResponder.bind(this);
this._panResponder = PanResponder.create({ //stop JS beautify collapse
onStartShouldSetPanResponder: shouldSetResponder,
onMoveShouldSetPanResponder: shouldSetResponder,
onPanResponderRelease: responderEnd,
onPanResponderTerminate: responderEnd
});
}
_handleShouldSetPanResponder(evt, gestureState) {
return evt.nativeEvent.touches.length === 1 &&
!this._gestureIsClick(gestureState);
}
_gestureIsClick(gestureState) {
return Math.abs(gestureState.dx) < 5 && Math.abs(gestureState.dy) < 5;
}
_handlePanResponderEnd(evt, gestureState) {
const swipeDirection = this._getSwipeDirection(gestureState);
this._triggerSwipeHandlers(swipeDirection, gestureState);
}
_triggerSwipeHandlers(swipeDirection, gestureState) {
const {onSwipe, onSwipeUp, onSwipeDown, onSwipeLeft, onSwipeRight} =
this.props;
const {SWIPE_LEFT, SWIPE_RIGHT, SWIPE_UP, SWIPE_DOWN} = swipeDirections;
onSwipe && onSwipe(swipeDirection, gestureState);
switch (swipeDirection) {
case SWIPE_LEFT:
onSwipeLeft && onSwipeLeft(gestureState);
break;
case SWIPE_RIGHT:
onSwipeRight && onSwipeRight(gestureState);
break;
case SWIPE_UP:
onSwipeUp && onSwipeUp(gestureState);
break;
case SWIPE_DOWN:
onSwipeDown && onSwipeDown(gestureState);
break;
}
}
_getSwipeDirection(gestureState) {
const {SWIPE_LEFT, SWIPE_RIGHT, SWIPE_UP, SWIPE_DOWN} = swipeDirections;
const {dx, dy} = gestureState;
if (this._isValidHorizontalSwipe(gestureState)) {
return (dx > 0)
? SWIPE_RIGHT
: SWIPE_LEFT;
} else if (this._isValidVerticalSwipe(gestureState)) {
return (dy > 0)
? SWIPE_DOWN
: SWIPE_UP;
}
return null;
}
_isValidHorizontalSwipe(gestureState) {
const {vx, dy} = gestureState;
const {velocityThreshold, directionalOffsetThreshold} =
this.swipeConfig;
return isValidSwipe(vx, velocityThreshold, dy,
directionalOffsetThreshold);
}
_isValidVerticalSwipe(gestureState) {
const {vy, dx} = gestureState;
const {velocityThreshold, directionalOffsetThreshold} =
this.swipeConfig;
return isValidSwipe(vy, velocityThreshold, dx,
directionalOffsetThreshold);
}
render() {
return (<View {...this.props} {...this._panResponder.panHandlers}/>);
}
};
Any help is appreciated. Thank You!

Related

How to change the width of NormalPeoplePicker dropdown

I'm using default example of NormalPeoplePicker from https://developer.microsoft.com/en-us/fluentui#/controls/web/peoplepicker#IPeoplePickerProps.
When the dropdown displays it cuts off longer items (example: 'Anny Lundqvist, Junior Manager of Soft..'). How do I make it wider, so that the full item's text displays?
import * as React from 'react';
import { Checkbox } from 'office-ui-fabric-react/lib/Checkbox';
import { IPersonaProps } from 'office-ui-fabric-react/lib/Persona';
import { IBasePickerSuggestionsProps, NormalPeoplePicker, ValidationState } from 'office-ui-fabric-react/lib/Pickers';
import { people, mru } from '#uifabric/example-data';
const suggestionProps: IBasePickerSuggestionsProps = {
suggestionsHeaderText: 'Suggested People',
mostRecentlyUsedHeaderText: 'Suggested Contacts',
noResultsFoundText: 'No results found',
loadingText: 'Loading',
showRemoveButtons: true,
suggestionsAvailableAlertText: 'People Picker Suggestions available',
suggestionsContainerAriaLabel: 'Suggested contacts',
};
const checkboxStyles = {
root: {
marginTop: 10,
},
};
export const PeoplePickerNormalExample: React.FunctionComponent = () => {
const [delayResults, setDelayResults] = React.useState(false);
const [isPickerDisabled, setIsPickerDisabled] = React.useState(false);
const [mostRecentlyUsed, setMostRecentlyUsed] = React.useState<IPersonaProps[]>(mru);
const [peopleList, setPeopleList] = React.useState<IPersonaProps[]>(people);
const picker = React.useRef(null);
const onFilterChanged = (
filterText: string,
currentPersonas: IPersonaProps[],
limitResults?: number,
): IPersonaProps[] | Promise<IPersonaProps[]> => {
if (filterText) {
let filteredPersonas: IPersonaProps[] = filterPersonasByText(filterText);
filteredPersonas = removeDuplicates(filteredPersonas, currentPersonas);
filteredPersonas = limitResults ? filteredPersonas.slice(0, limitResults) : filteredPersonas;
return filterPromise(filteredPersonas);
} else {
return [];
}
};
const filterPersonasByText = (filterText: string): IPersonaProps[] => {
return peopleList.filter(item => doesTextStartWith(item.text as string, filterText));
};
const filterPromise = (personasToReturn: IPersonaProps[]): IPersonaProps[] | Promise<IPersonaProps[]> => {
if (delayResults) {
return convertResultsToPromise(personasToReturn);
} else {
return personasToReturn;
}
};
const returnMostRecentlyUsed = (currentPersonas: IPersonaProps[]): IPersonaProps[] | Promise<IPersonaProps[]> => {
return filterPromise(removeDuplicates(mostRecentlyUsed, currentPersonas));
};
const onRemoveSuggestion = (item: IPersonaProps): void => {
const indexPeopleList: number = peopleList.indexOf(item);
const indexMostRecentlyUsed: number = mostRecentlyUsed.indexOf(item);
if (indexPeopleList >= 0) {
const newPeople: IPersonaProps[] = peopleList
.slice(0, indexPeopleList)
.concat(peopleList.slice(indexPeopleList + 1));
setPeopleList(newPeople);
}
if (indexMostRecentlyUsed >= 0) {
const newSuggestedPeople: IPersonaProps[] = mostRecentlyUsed
.slice(0, indexMostRecentlyUsed)
.concat(mostRecentlyUsed.slice(indexMostRecentlyUsed + 1));
setMostRecentlyUsed(newSuggestedPeople);
}
};
const onDisabledButtonClick = (): void => {
setIsPickerDisabled(!isPickerDisabled);
};
const onToggleDelayResultsChange = (): void => {
setDelayResults(!delayResults);
};
return (
<div>
<NormalPeoplePicker
// eslint-disable-next-line react/jsx-no-bind
onResolveSuggestions={onFilterChanged}
// eslint-disable-next-line react/jsx-no-bind
onEmptyInputFocus={returnMostRecentlyUsed}
getTextFromItem={getTextFromItem}
pickerSuggestionsProps={suggestionProps}
className={'ms-PeoplePicker'}
key={'normal'}
// eslint-disable-next-line react/jsx-no-bind
onRemoveSuggestion={onRemoveSuggestion}
onValidateInput={validateInput}
removeButtonAriaLabel={'Remove'}
inputProps={{
onBlur: (ev: React.FocusEvent<HTMLInputElement>) => console.log('onBlur called'),
onFocus: (ev: React.FocusEvent<HTMLInputElement>) => console.log('onFocus called'),
'aria-label': 'People Picker',
}}
componentRef={picker}
onInputChange={onInputChange}
resolveDelay={300}
disabled={isPickerDisabled}
/>
<Checkbox
label="Disable People Picker"
checked={isPickerDisabled}
// eslint-disable-next-line react/jsx-no-bind
onChange={onDisabledButtonClick}
styles={checkboxStyles}
/>
<Checkbox
label="Delay Suggestion Results"
defaultChecked={delayResults}
// eslint-disable-next-line react/jsx-no-bind
onChange={onToggleDelayResultsChange}
styles={checkboxStyles}
/>
</div>
);
};
function doesTextStartWith(text: string, filterText: string): boolean {
return text.toLowerCase().indexOf(filterText.toLowerCase()) === 0;
}
function removeDuplicates(personas: IPersonaProps[], possibleDupes: IPersonaProps[]) {
return personas.filter(persona => !listContainsPersona(persona, possibleDupes));
}
function listContainsPersona(persona: IPersonaProps, personas: IPersonaProps[]) {
if (!personas || !personas.length || personas.length === 0) {
return false;
}
return personas.filter(item => item.text === persona.text).length > 0;
}
function convertResultsToPromise(results: IPersonaProps[]): Promise<IPersonaProps[]> {
return new Promise<IPersonaProps[]>((resolve, reject) => setTimeout(() => resolve(results), 2000));
}
function getTextFromItem(persona: IPersonaProps): string {
return persona.text as string;
}
function validateInput(input: string): ValidationState {
if (input.indexOf('#') !== -1) {
return ValidationState.valid;
} else if (input.length > 1) {
return ValidationState.warning;
} else {
return ValidationState.invalid;
}
}
/**
* Takes in the picker input and modifies it in whichever way
* the caller wants, i.e. parsing entries copied from Outlook (sample
* input: "Aaron Reid <aaron>").
*
* #param input The text entered into the picker.
*/
function onInputChange(input: string): string {
const outlookRegEx = /<.*>/g;
const emailAddress = outlookRegEx.exec(input);
if (emailAddress && emailAddress[0]) {
return emailAddress[0].substring(1, emailAddress[0].length - 1);
}
return input;
}
Component which renders suggestion list have fixed width of 180px. Take a look at PeoplePickerItemSuggestion.styles.ts.
What you can do is to modify this class .ms-PeoplePicker-Persona:
.ms-PeoplePicker-Persona {
width: 260px; // Or what ever you want
}
UPDATE - Solution from comments
Change width trough styles property of PeoplePickerItemSuggestion Component
const onRenderSuggestionsItem = (personaProps, suggestionsProps) => (
<PeoplePickerItemSuggestion
personaProps={personaProps}
suggestionsProps={suggestionsProps}
styles={{ personaWrapper: { width: '100%' }}}
/>
);
<NormalPeoplePicker
onRenderSuggestionsItem={onRenderSuggestionsItem}
pickerCalloutProps={{ calloutWidth: 500 }}
...restProps
/>
Working Codepen example
For more information how to customize components read Component Styling.

Error integrating Agora.io with nuxt.js Error in created hook: "ReferenceError: AgoraRTC is not defined"

I am integrating Agora Web SDK with nuxt.js.
I have included all the methods I need and my page has the following methods and lifecycle hooks:
methods: {
streamInit(uid, attendeeMode, videoProfile, config) {
let defaultConfig = {
streamID: uid,
audio: true,
video: true,
screen: false
};
switch (attendeeMode) {
case "audio-only":
defaultConfig.video = false;
break;
case "audience":
defaultConfig.video = false;
defaultConfig.audio = false;
break;
default:
case "video":
break;
}
let stream = AgoraRTC.createStream(merge(defaultConfig, config));
stream.setVideoProfile(videoProfile);
return stream;
},
subscribeStreamEvents() {
let rt = this;
rt.client.on("stream-added", function(evt) {
let stream = evt.stream;
console.log("New stream added: " + stream.getId());
console.log("At " + new Date().toLocaleTimeString());
console.log("Subscribe ", stream);
rt.client.subscribe(stream, function(err) {
console.log("Subscribe stream failed", err);
});
});
rt.client.on("peer-leave", function(evt) {
console.log("Peer has left: " + evt.uid);
console.log(new Date().toLocaleTimeString());
console.log(evt);
rt.removeStream(evt.uid);
});
rt.client.on("stream-subscribed", function(evt) {
let stream = evt.stream;
console.log("Got stream-subscribed event");
console.log(new Date().toLocaleTimeString());
console.log("Subscribe remote stream successfully: " + stream.getId());
console.log(evt);
rt.addStream(stream);
});
rt.client.on("stream-removed", function(evt) {
let stream = evt.stream;
console.log("Stream removed: " + stream.getId());
console.log(new Date().toLocaleTimeString());
console.log(evt);
rt.removeStream(stream.getId());
});
},
removeStream(uid) {
this.streamList.map((item, index) => {
if (item.getId() === uid) {
item.close();
let element = document.querySelector("#ag-item-" + uid);
if (element) {
element.parentNode.removeChild(element);
}
let tempList = [...this.streamList];
tempList.splice(index, 1);
this.streamList = tempList;
}
});
},
addStream(stream, push = false) {
let repeatition = this.streamList.some(item => {
return item.getId() === stream.getId();
});
if (repeatition) {
return;
}
if (push) {
this.streamList = this.streamList.concat([stream]);
} else {
this.streamList = [stream].concat(this.streamList);
}
},
handleCamera(e) {
e.currentTarget.classList.toggle("off");
this.localStream.isVideoOn()
? this.localStream.disableVideo()
: this.localStream.enableVideo();
},
handleMic(e) {
e.currentTarget.classList.toggle("off");
this.localStream.isAudioOn()
? this.localStream.disableAudio()
: this.localStream.enableAudio();
},
switchDisplay(e) {
if (
e.currentTarget.classList.contains("disabled") ||
this.streamList.length <= 1
) {
return;
}
if (this.displayMode === "pip") {
this.displayMode = "tile";
} else if (this.displayMode === "tile") {
this.displayMode = "pip";
} else if (this.displayMode === "share") {
// do nothing or alert, tbd
} else {
console.error("Display Mode can only be tile/pip/share");
}
},
hideRemote(e) {
if (
e.currentTarget.classList.contains("disabled") ||
this.streamList.length <= 1
) {
return;
}
let list;
let id = this.streamList[this.streamList.length - 1].getId();
list = Array.from(
document.querySelectorAll(`.ag-item:not(#ag-item-${id})`)
);
list.map(item => {
if (item.style.display !== "none") {
item.style.display = "none";
} else {
item.style.display = "block";
}
});
},
handleExit(e) {
if (e.currentTarget.classList.contains("disabled")) {
return;
}
try {
this.client && this.client.unpublish(this.localStream);
this.localStream && this.localStream.close();
this.client &&
this.client.leave(
() => {
console.log("Client succeed to leave.");
},
() => {
console.log("Client failed to leave.");
}
);
} finally {
this.readyState = false;
this.client = null;
this.localStream = null;
// redirect to index
this.$router.push("/");
}
}
},
created() {
let $ = this;
// init AgoraRTC local client
$.client = AgoraRTC.createClient({ mode: $.transcode });
$.client.init($.appId, () => {
console.log("AgoraRTC client initialized");
$.subscribeStreamEvents();
$.client.join($.appId, $.channel, $.uid, uid => {
console.log("User " + uid + " join channel successfully");
console.log("At " + new Date().toLocaleTimeString());
// create local stream
// It is not recommended to setState in function addStream
$.localStream = this.streamInit(uid, $.attendeeMode, $.videoProfile);
$.localStream.init(
() => {
if ($.attendeeMode !== "audience") {
$.addStream($.localStream, true);
$.client.publish($.localStream, err => {
console.log("Publish local stream error: " + err);
});
}
$.readyState = true;
},
err => {
console.log("getUserMedia failed", err);
$.readyState = true;
}
);
});
});
},
mounted() {
this.$nextTick(() => {
// add listener to control btn group
let canvas = document.querySelector("#ag-canvas");
let btnGroup = document.querySelector(".ag-btn-group");
canvas.addEventListener("mousemove", () => {
if (global._toolbarToggle) {
clearTimeout(global._toolbarToggle);
}
btnGroup.classList.add("active");
global._toolbarToggle = setTimeout(function() {
btnGroup.classList.remove("active");
}, 2000);
});
});
},
beforeUpdate() {
let $ = this;
// rerendering
let canvas = document.querySelector("#ag-canvas");
// pip mode (can only use when less than 4 people in channel)
if ($.displayMode === "pip") {
let no = $.streamList.length;
if (no > 4) {
$.displayMode = "tile";
return;
}
$.streamList.map((item, index) => {
let id = item.getId();
let dom = document.querySelector("#ag-item-" + id);
if (!dom) {
dom = document.createElement("section");
dom.setAttribute("id", "ag-item-" + id);
dom.setAttribute("class", "ag-item");
canvas.appendChild(dom);
item.play("ag-item-" + id);
}
if (index === no - 1) {
dom.setAttribute("style", `grid-area: span 12/span 24/13/25`);
} else {
dom.setAttribute(
"style",
`grid-area: span 3/span 4/${4 + 3 * index}/25;
z-index:1;width:calc(100% - 20px);height:calc(100% - 20px)`
);
}
item.player.resize && item.player.resize();
});
} else if ($.displayMode === "tile") {
// tile mode
let no = $.streamList.length;
$.streamList.map((item, index) => {
let id = item.getId();
let dom = document.querySelector("#ag-item-" + id);
if (!dom) {
dom = document.createElement("section");
dom.setAttribute("id", "ag-item-" + id);
dom.setAttribute("class", "ag-item");
canvas.appendChild(dom);
item.play("ag-item-" + id);
}
dom.setAttribute("style", `grid-area: ${tile_canvas[no][index]}`);
item.player.resize && item.player.resize();
});
} else if ($.displayMode === "share") {
// screen share mode (tbd)
}
},
beforeDestroy () {
this.client && this.client.unpublish(this.localStream);
this.localStream && this.localStream.close();
this.client &&
this.client.leave(
() => {
console.log("Client succeed to leave.");
},
() => {
console.log("Client failed to leave.");
}
);
}
I have installed agora-rtc-sdk from npm.
My plugins/agora.js file looks like this
import Vue from "vue";
import AgoraRTC from 'agora-rtc-sdk';
Vue.use(AgoraRTC);
My nuxt.config.js has plugins declared as:
{
src: "~/plugins/agora.js",
ssr: false
}
The application on loading the page gives AgoraRTC is not defined. How do I add this AgoraRTC to my nuxt.js application?
Agora works only on the client side, fully independent of a server and hence you need to define the mode as client in the nuxt.config.js like this:
{ src: '~/plugins/agora.js', mode: 'client' },

My reanimated works more than once. How can make this animation work for once?

I'm trying to make my tabbar dissappear while scrolling down with animation. onScroll sends boolean value if last y coord is bigger than current y coord its scrolling up and otherwise scrolling down. If I continue to scroll down onScroll still sends true value to my function and animaton works more than once. How can i disable position so only toValue is gonna work and my function will not trigger again and again while returning boolean value is same from onScroll.
function runTiming(value, dest) {
const clock = new Clock();
const state = {
finished: new Value(0),
position: new Value(0),
time: new Value(0),
frameTime: new Value(0),
};
const config = {
duration: 200,
toValue: new Value(0),
easing: Easing.inOut(Easing.cubic),
};
return block([
cond(clockRunning(clock), 0, [
set(state.finished, 0),
set(state.time, 0),
set(state.position, value),
set(state.frameTime, 0),
set(config.toValue, dest),
startClock(clock),
]),
timing(clock, state, config),
cond(state.finished, debug('stop clock', stopClock(clock))),
state.position,
]);
}
This might be due to the onScroll event being fired more than once.
I just coded this yesterday and will give you the code that is working and has been tested:
export const throttle = (func, limit) => {
let inThrottle
return function() {
const args = arguments
const context = this
if (!inThrottle) {
func.apply(context, args)
inThrottle = true
setTimeout(() => inThrottle = false, limit)
}
}
}
class MainComponent extends PureComponent {
constructor(props) {
super(props);
this.offset = 0;
this.isAnimatingMenu = false;
this.onScroll = this.onScroll.bind(this)
};
onScroll = throttle(event => {
const currentOffset = event.nativeEvent.contentOffset.y;
const direction = currentOffset > this.offset ? 'down' : 'up';
const diff = currentOffset - this.offset;
if (direction === 'down' && diff > 9 && !this.isAnimatingMenu) {
this.isAnimatingMenu = true
this.onHideMenu(() => this.isAnimatingMenu = false)
}
if (direction === 'up' && diff < -9 && !this.isAnimatingMenu) {
this.isAnimatingMenu = true
this.onShowMenu(() => this.isAnimatingMenu = false)
}
this.offset = currentOffset;
}, 75)
render() {
<FlatList
windowSize={1}
bounces={false}
style={styles.flex1}
scrollEventThrottle={75}
onScroll={this.onScroll}
renderItem={this.renderItem}
data={this.deriveHomeWidgetsDataFromProps()}
/>
}
}
In the functions onHideMenu and onShowMenu call your animation function to show/hide the menu. onScroll can be implemented on ScrollView or SectionList aswell. If you need more help let me know.

How to hide onScroll header in ionic 4?

I want to hide the header on scroll in Ionic 4 Beta 5.
I tried all the directives solutions, but none of them work for me.
So, are there any methods that work?
Use below directive
import { IonContent, DomController } from '#ionic/angular';
import { Directive, ElementRef, Input, Renderer2, SimpleChanges } from '#angular/core';
#Directive({
selector: '[scrollHide]'
})
export class ScrollHideDirective {
#Input('scrollHide') config: ScrollHideConfig;
#Input('scrollContent') scrollContent: IonContent;
contentHeight: number;
scrollHeight: number;
lastScrollPosition: number;
lastValue: number = 0;
constructor(private element: ElementRef, private renderer: Renderer2, private domCtrl: DomController) {
}
ngOnChanges(changes: SimpleChanges) {
if(this.scrollContent && this.config) {
this.scrollContent.scrollEvents = true;
let scrollStartFunc = async (ev) => {
const el = await this.scrollContent.getScrollElement();
this.contentHeight = el.offsetHeight;
this.scrollHeight = el.scrollHeight;
if (this.config.maxValue === undefined) {
this.config.maxValue = this.element.nativeElement.offsetHeight;
}
this.lastScrollPosition = el.scrollTop;
};
if(this.scrollContent && this.scrollContent instanceof IonContent) {
this.scrollContent.ionScrollStart.subscribe(scrollStartFunc);
this.scrollContent.ionScroll.subscribe(async (ev) => this.adjustElementOnScroll(ev));
this.scrollContent.ionScrollEnd.subscribe(async (ev) => this.adjustElementOnScroll(ev));
} else if(this.scrollContent instanceof HTMLElement) {
(this.scrollContent as HTMLElement).addEventListener('ionScrollStart', scrollStartFunc);
(this.scrollContent as HTMLElement).addEventListener('ionScroll',async (ev) => this.adjustElementOnScroll(ev));
(this.scrollContent as HTMLElement).addEventListener('ionScrollEnd',async (ev) => this.adjustElementOnScroll(ev));
}
}
}
private adjustElementOnScroll(ev) {
if (ev) {
this.domCtrl.write(async () => {
const el = await this.scrollContent.getScrollElement();
let scrollTop: number = el.scrollTop > 0 ? el.scrollTop : 0;
let scrolldiff: number = scrollTop - this.lastScrollPosition;
this.lastScrollPosition = scrollTop;
let newValue = this.lastValue + scrolldiff;
newValue = Math.max(0, Math.min(newValue, this.config.maxValue));
this.renderer.setStyle(this.element.nativeElement, this.config.cssProperty, `-${newValue}px`);
this.lastValue = newValue;
});
}
}
}
export interface ScrollHideConfig {
cssProperty: string;
maxValue: number;
}
Steps to use:
In your HTML
<ion-header [scrollHide]="headerScrollConfig" [scrollContent]="pageContent">
.
.
.
<ion-content #pageContent>
In your controller: Add config variables
footerScrollConfig: ScrollHideConfig = { cssProperty: 'margin-bottom', maxValue: undefined };
headerScrollConfig: ScrollHideConfig = { cssProperty: 'margin-top', maxValue: 54 };

React-native flatlist to keep scrolling while touching view

I am trying to implement a drag and drop solution in react-native and I want to make my flatlist scroll if I drag an item in the upper 10 percent and bottom 10 percent of the view. So far the only way i can get it to happen is by calling a function that recursively dispatches a this._flatList.scrollToOffset({ offset, animated: false });. The recursive call stops when a certain condition is met but the scrolling effect is choppy. Any advice on making that smoother?
// on move pan responder
onPanResponderMove: Animated.event([null, { [props.horizontal ? 'moveX' : 'moveY']: this._moveAnim }], {
listener: (evt, gestureState) => {
const { moveX, moveY } = gestureState
const { horizontal } = this.props
this._move = horizontal ? moveX : moveY;
const { pageY } = evt.nativeEvent;
const tappedPixel = pageY;
const topIndex = Math.floor(((tappedPixel - this._distanceFromTop + this._scrollOffset) - this._containerOffset) / 85);
const bottomIndex = Math.floor(((tappedPixel + (85 - this._distanceFromTop) + this._scrollOffset) - this._containerOffset) / 85);
this.setTopAndBottom(topIndex, bottomIndex);
this.scrolling = true;
this.scrollRec();
}
}),
// recursive scroll function
scrollRec = () => {
const { activeRow } = this.state;
const { scrollPercent, data, } = this.props;
const scrollRatio = scrollPercent / 100;
const isLastItem = activeRow === data.length - 1;
const fingerPosition = Math.max(0, this._move - this._containerOffset);
const shouldScrollUp = fingerPosition < (this._containerSize * scrollRatio); // finger is in first 10 percent
const shouldScrollDown = !isLastItem && fingerPosition > (this._containerSize * (1 - scrollRatio)) // finger is in last 10
const nextSpacerIndex = this.getSpacerIndex(this._move, activeRow);
if (nextSpacerIndex >= this.props.data.length) { this.scrolling = false; return this._flatList.scrollToEnd(); }
if (nextSpacerIndex === -1) { this.scrolling = false; return; }
if (shouldScrollUp) this.scroll(-20);
else if (shouldScrollDown) this.scroll(20);
else { this.scrolling = false; return; };
setTimeout(this.scrollRec, 50);
}
/
Yeah, pass an options object to your Animated.event with your listener with useNativeDriver set to true
Animated.event([
null,
{ [props.horizontal ? "moveX" : "moveY"]: this._moveAnim },
{
listener: ...,
useNativeDriver: true
}
]);
Should make things significantly smoother.
edit: I feel I should add that there is probably a saner way to accomplish this, are you only using a FlatList because of it's "infinite" dimensions?