devextreme
Version:
HTML5 JavaScript Component Suite for Responsive Web Development
61 lines (60 loc) • 1.97 kB
JavaScript
/**
* DevExtreme (events/pointer/observer.js)
* Version: 18.2.18
* Build date: Tue Oct 18 2022
*
* Copyright (c) 2012 - 2022 Developer Express Inc. ALL RIGHTS RESERVED
* Read about DevExtreme licensing here: https://js.devexpress.com/Licensing/
*/
;
var each = require("../../core/utils/iterator").each,
readyCallbacks = require("../../core/utils/ready_callbacks"),
domAdapter = require("../../core/dom_adapter");
var addEventsListener = function(events, handler) {
readyCallbacks.add(function() {
events.split(" ").forEach(function(event) {
domAdapter.listen(domAdapter.getDocument(), event, handler, true)
})
})
};
var Observer = function(eventMap, pointerEquals, onPointerAdding) {
onPointerAdding = onPointerAdding || function() {};
var pointers = [];
var getPointerIndex = function(e) {
var index = -1;
each(pointers, function(i, pointer) {
if (!pointerEquals(e, pointer)) {
return true
}
index = i;
return false
});
return index
};
var addPointer = function(e) {
if (getPointerIndex(e) === -1) {
onPointerAdding(e);
pointers.push(e)
}
};
var removePointer = function(e) {
var index = getPointerIndex(e);
if (index > -1) {
pointers.splice(index, 1)
}
};
var updatePointer = function(e) {
pointers[getPointerIndex(e)] = e
};
addEventsListener(eventMap.dxpointerdown, addPointer);
addEventsListener(eventMap.dxpointermove, updatePointer);
addEventsListener(eventMap.dxpointerup, removePointer);
addEventsListener(eventMap.dxpointercancel, removePointer);
this.pointers = function() {
return pointers
};
this.reset = function() {
pointers = []
}
};
module.exports = Observer;