devextreme/events/core/emitter.js

HTML5 JavaScript Component Suite for Responsive Web Development

/**
 * DevExtreme (events/core/emitter.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/
 */
"use strict";
var $ = require("../../core/renderer"),
    noop = require("../../core/utils/common").noop,
    Class = require("../../core/class"),
    Callbacks = require("../../core/utils/callbacks"),
    extend = require("../../core/utils/extend").extend,
    eventUtils = require("../utils");
var Emitter = Class.inherit({
    ctor: function(element) {
        this._$element = $(element);
        this._cancelCallback = Callbacks();
        this._acceptCallback = Callbacks()
    },
    getElement: function() {
        return this._$element
    },
    validate: function(e) {
        return !eventUtils.isDxMouseWheelEvent(e)
    },
    validatePointers: function(e) {
        return 1 === eventUtils.hasTouches(e)
    },
    allowInterruptionByMouseWheel: function() {
        return true
    },
    configure: function(data) {
        extend(this, data)
    },
    addCancelCallback: function(callback) {
        this._cancelCallback.add(callback)
    },
    removeCancelCallback: function() {
        this._cancelCallback.empty()
    },
    _cancel: function(e) {
        this._cancelCallback.fire(this, e)
    },
    addAcceptCallback: function(callback) {
        this._acceptCallback.add(callback)
    },
    removeAcceptCallback: function() {
        this._acceptCallback.empty()
    },
    _accept: function(e) {
        this._acceptCallback.fire(this, e)
    },
    _requestAccept: function(e) {
        this._acceptRequestEvent = e
    },
    _forgetAccept: function() {
        this._accept(this._acceptRequestEvent);
        this._acceptRequestEvent = null
    },
    start: noop,
    move: noop,
    end: noop,
    cancel: noop,
    reset: function() {
        if (this._acceptRequestEvent) {
            this._accept(this._acceptRequestEvent)
        }
    },
    _fireEvent: function(eventName, e, params) {
        var eventData = extend({
            type: eventName,
            originalEvent: e,
            target: this._getEmitterTarget(e),
            delegateTarget: this.getElement().get(0)
        }, params);
        e = eventUtils.fireEvent(eventData);
        if (e.cancel) {
            this._cancel(e)
        }
        return e
    },
    _getEmitterTarget: function(e) {
        return (this.delegateSelector ? $(e.target).closest(this.delegateSelector) : this.getElement()).get(0)
    },
    dispose: noop
});
module.exports = Emitter;