devextreme
Version:
HTML5 JavaScript Component Suite for Responsive Web Development
60 lines (59 loc) • 1.9 kB
JavaScript
/**
* DevExtreme (esm/__internal/events/pointer/m_observer.js)
* Version: 24.2.6
* Build date: Mon Mar 17 2025
*
* Copyright (c) 2012 - 2025 Developer Express Inc. ALL RIGHTS RESERVED
* Read about DevExtreme licensing here: https://js.devexpress.com/Licensing/
*/
import domAdapter from "../../../core/dom_adapter";
import {
each
} from "../../../core/utils/iterator";
import readyCallbacks from "../../../core/utils/ready_callbacks";
const addEventsListener = function(events, handler) {
readyCallbacks.add((() => {
events.split(" ").forEach((event => {
domAdapter.listen(domAdapter.getDocument(), event, handler, true)
}))
}))
};
const Observer = function(eventMap, pointerEquals, onPointerAdding) {
onPointerAdding = onPointerAdding || function() {};
let pointers = [];
const getPointerIndex = function(e) {
let index = -1;
each(pointers, ((i, pointer) => {
if (!pointerEquals(e, pointer)) {
return true
}
index = i;
return false
}));
return index
};
const removePointer = function(e) {
const index = getPointerIndex(e);
if (index > -1) {
pointers.splice(index, 1)
}
};
addEventsListener(eventMap.dxpointerdown, (function(e) {
if (-1 === getPointerIndex(e)) {
onPointerAdding(e);
pointers.push(e)
}
}));
addEventsListener(eventMap.dxpointermove, (function(e) {
pointers[getPointerIndex(e)] = e
}));
addEventsListener(eventMap.dxpointerup, removePointer);
addEventsListener(eventMap.dxpointercancel, removePointer);
this.pointers = function() {
return pointers
};
this.reset = function() {
pointers = []
}
};
export default Observer;