react-native-web
Version:
React Native for Web
56 lines (53 loc) • 2 kB
Flow
/**
* Copyright (c) Meta Platforms, Inc. and affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*
* @flow
*/
import type { Touch, TouchEvent } from './ResponderEventTypes';
import { isStartish, isMoveish, isEndish } from './ResponderEventTypes';
type TouchRecord = {|
currentPageX: number,
currentPageY: number,
currentTimeStamp: number,
previousPageX: number,
previousPageY: number,
previousTimeStamp: number,
startPageX: number,
startPageY: number,
startTimeStamp: number,
touchActive: boolean,
|};
export type TouchHistory = $ReadOnly<{|
indexOfSingleActiveTouch: number,
mostRecentTimeStamp: number,
numberActiveTouches: number,
touchBank: Array<TouchRecord>,
|}>;
/**
* Tracks the position and time of each active touch by `touch.identifier`. We
* should typically only see IDs in the range of 1-20 because IDs get recycled
* when touches end and start again.
*/
const __DEV__ = process.env.NODE_ENV !== 'production';
const MAX_TOUCH_BANK = 20;
declare function timestampForTouch(touch: Touch): number;
/**
* TODO: Instead of making gestures recompute filtered velocity, we could
* include a built in velocity computation that can be reused globally.
*/
declare function createTouchRecord(touch: Touch): TouchRecord;
declare function resetTouchRecord(touchRecord: TouchRecord, touch: Touch): void;
declare function getTouchIdentifier(arg0: Touch): number;
declare function recordTouchStart(touch: Touch, touchHistory: any): void;
declare function recordTouchMove(touch: Touch, touchHistory: any): void;
declare function recordTouchEnd(touch: Touch, touchHistory: any): void;
declare function printTouch(touch: Touch): string;
declare function printTouchBank(touchHistory: any): string;
declare export class ResponderTouchHistoryStore {
_touchHistory: any,
recordTouchTrack(topLevelType: string, nativeEvent: TouchEvent): void,
touchHistory(): TouchHistory,
}