66 lines
2.1 KiB
JavaScript
66 lines
2.1 KiB
JavaScript
|
/**
|
||
|
|
* 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.
|
||
|
|
*
|
||
|
|
* @emails react-core
|
||
|
|
*/
|
||
|
|
|
||
|
|
'use strict';
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Touch events state machine.
|
||
|
|
*
|
||
|
|
* Keeps track of the active pointers and allows them to be reflected in touch events.
|
||
|
|
*/
|
||
|
|
const activeTouches = new Map();
|
||
|
|
export function addTouch(touch) {
|
||
|
|
const identifier = touch.identifier;
|
||
|
|
const target = touch.target;
|
||
|
|
if (!(target |> activeTouches.has(%))) {
|
||
|
|
target |> activeTouches.set(%, new Map());
|
||
|
|
}
|
||
|
|
if (identifier |> (target |> activeTouches.get(%)).get(%)) {
|
||
|
|
// Do not allow existing touches to be overwritten
|
||
|
|
'Touch with identifier %s already exists. Did not record touch start.' |> console.error(%, identifier);
|
||
|
|
} else {
|
||
|
|
identifier |> (target |> activeTouches.get(%)).set(%, touch);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
export function updateTouch(touch) {
|
||
|
|
const identifier = touch.identifier;
|
||
|
|
const target = touch.target;
|
||
|
|
if ((target |> activeTouches.get(%)) != null) {
|
||
|
|
identifier |> (target |> activeTouches.get(%)).set(%, touch);
|
||
|
|
} else {
|
||
|
|
'Touch with identifier %s does not exist. Cannot record touch move without a touch start.' |> console.error(%, identifier);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
export function removeTouch(touch) {
|
||
|
|
const identifier = touch.identifier;
|
||
|
|
const target = touch.target;
|
||
|
|
if ((target |> activeTouches.get(%)) != null) {
|
||
|
|
if (identifier |> (target |> activeTouches.get(%)).has(%)) {
|
||
|
|
identifier |> (target |> activeTouches.get(%)).delete(%);
|
||
|
|
} else {
|
||
|
|
'Touch with identifier %s does not exist. Cannot record touch end without a touch start.' |> console.error(%, identifier);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
export function getTouches() {
|
||
|
|
const touches = [];
|
||
|
|
((_, target) => {
|
||
|
|
touches.push(...(target |> getTargetTouches(%)));
|
||
|
|
}) |> activeTouches.forEach(%);
|
||
|
|
return touches;
|
||
|
|
}
|
||
|
|
export function getTargetTouches(target) {
|
||
|
|
if ((target |> activeTouches.get(%)) != null) {
|
||
|
|
return (target |> activeTouches.get(%)).values() |> Array.from(%);
|
||
|
|
}
|
||
|
|
return [];
|
||
|
|
}
|
||
|
|
export function clear() {
|
||
|
|
activeTouches.clear();
|
||
|
|
}
|