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* 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.
*
* @flow
*/
import type { Touch, TouchEvent } from './ResponderEventTypes';
import { isStartish, isMoveish, isEndish } from './ResponderEventTypes';
type TouchRecord = {|
touchActive: boolean,
startPageX: number,
startPageY: number,
startTimeStamp: number,
currentPageX: number,
currentPageY: number,
currentTimeStamp: number,
previousPageX: number,
previousPageY: number,
previousTimeStamp: number
|};
/**
* 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;
const touchBank: Array<TouchRecord> = [];
const touchHistory = {
touchBank,
numberActiveTouches: 0,
// If there is only one active touch, we remember its location. This prevents
// us having to loop through all of the touches all the time in the most
// common case.
indexOfSingleActiveTouch: -1,
mostRecentTimeStamp: 0
};
function timestampForTouch(touch: Touch): number {
// The legacy internal implementation provides "timeStamp", which has been
// renamed to "timestamp".
return (touch: any).timeStamp || touch.timestamp;
}
/**
* TODO: Instead of making gestures recompute filtered velocity, we could
* include a built in velocity computation that can be reused globally.
*/
function createTouchRecord(touch: Touch): TouchRecord {
return {
touchActive: true,
startPageX: touch.pageX,
startPageY: touch.pageY,
startTimeStamp: timestampForTouch(touch),
currentPageX: touch.pageX,
currentPageY: touch.pageY,
currentTimeStamp: timestampForTouch(touch),
previousPageX: touch.pageX,
previousPageY: touch.pageY,
previousTimeStamp: timestampForTouch(touch)
};
}
function resetTouchRecord(touchRecord: TouchRecord, touch: Touch): void {
touchRecord.touchActive = true;
touchRecord.startPageX = touch.pageX;
touchRecord.startPageY = touch.pageY;
touchRecord.startTimeStamp = timestampForTouch(touch);
touchRecord.currentPageX = touch.pageX;
touchRecord.currentPageY = touch.pageY;
touchRecord.currentTimeStamp = timestampForTouch(touch);
touchRecord.previousPageX = touch.pageX;
touchRecord.previousPageY = touch.pageY;
touchRecord.previousTimeStamp = timestampForTouch(touch);
}
function getTouchIdentifier({ identifier }: Touch): number {
Iif (identifier == null) {
console.error('Touch object is missing identifier.');
}
Eif (__DEV__) {
Iif (identifier > MAX_TOUCH_BANK) {
console.error(
'Touch identifier %s is greater than maximum supported %s which causes ' +
'performance issues backfilling array locations for all of the indices.',
identifier,
MAX_TOUCH_BANK
);
}
}
return identifier;
}
function recordTouchStart(touch: Touch): void {
const identifier = getTouchIdentifier(touch);
const touchRecord = touchBank[identifier];
if (touchRecord) {
resetTouchRecord(touchRecord, touch);
} else {
touchBank[identifier] = createTouchRecord(touch);
}
touchHistory.mostRecentTimeStamp = timestampForTouch(touch);
}
function recordTouchMove(touch: Touch): void {
const touchRecord = touchBank[getTouchIdentifier(touch)];
Eif (touchRecord) {
touchRecord.touchActive = true;
touchRecord.previousPageX = touchRecord.currentPageX;
touchRecord.previousPageY = touchRecord.currentPageY;
touchRecord.previousTimeStamp = touchRecord.currentTimeStamp;
touchRecord.currentPageX = touch.pageX;
touchRecord.currentPageY = touch.pageY;
touchRecord.currentTimeStamp = timestampForTouch(touch);
touchHistory.mostRecentTimeStamp = timestampForTouch(touch);
} else {
console.warn(
'Cannot record touch move without a touch start.\n',
`Touch Move: ${printTouch(touch)}\n`,
`Touch Bank: ${printTouchBank()}`
);
}
}
function recordTouchEnd(touch: Touch): void {
const touchRecord = touchBank[getTouchIdentifier(touch)];
Eif (touchRecord) {
touchRecord.touchActive = false;
touchRecord.previousPageX = touchRecord.currentPageX;
touchRecord.previousPageY = touchRecord.currentPageY;
touchRecord.previousTimeStamp = touchRecord.currentTimeStamp;
touchRecord.currentPageX = touch.pageX;
touchRecord.currentPageY = touch.pageY;
touchRecord.currentTimeStamp = timestampForTouch(touch);
touchHistory.mostRecentTimeStamp = timestampForTouch(touch);
} else {
console.warn(
'Cannot record touch end without a touch start.\n',
`Touch End: ${printTouch(touch)}\n`,
`Touch Bank: ${printTouchBank()}`
);
}
}
function printTouch(touch: Touch): string {
return JSON.stringify({
identifier: touch.identifier,
pageX: touch.pageX,
pageY: touch.pageY,
timestamp: timestampForTouch(touch)
});
}
function printTouchBank(): string {
let printed = JSON.stringify(touchBank.slice(0, MAX_TOUCH_BANK));
if (touchBank.length > MAX_TOUCH_BANK) {
printed += ' (original size: ' + touchBank.length + ')';
}
return printed;
}
const ResponderTouchHistoryStore = {
recordTouchTrack(topLevelType: string, nativeEvent: TouchEvent): void {
if (isMoveish(topLevelType)) {
nativeEvent.changedTouches.forEach(recordTouchMove);
} else if (isStartish(topLevelType)) {
nativeEvent.changedTouches.forEach(recordTouchStart);
touchHistory.numberActiveTouches = nativeEvent.touches.length;
if (touchHistory.numberActiveTouches === 1) {
touchHistory.indexOfSingleActiveTouch = nativeEvent.touches[0].identifier;
}
} else Eif (isEndish(topLevelType)) {
nativeEvent.changedTouches.forEach(recordTouchEnd);
touchHistory.numberActiveTouches = nativeEvent.touches.length;
if (touchHistory.numberActiveTouches === 1) {
for (let i = 0; i < touchBank.length; i++) {
const touchTrackToCheck = touchBank[i];
if (touchTrackToCheck != null && touchTrackToCheck.touchActive) {
touchHistory.indexOfSingleActiveTouch = i;
break;
}
}
Eif (__DEV__) {
const activeRecord = touchBank[touchHistory.indexOfSingleActiveTouch];
Iif (!(activeRecord != null && activeRecord.touchActive)) {
console.error('Cannot find single active touch.');
}
}
}
}
},
touchHistory
};
export default ResponderTouchHistoryStore;
|