devextreme
Version:
HTML5 JavaScript Component Suite for Responsive Web Development
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JavaScript
/**
* DevExtreme (events/core/emitter_registrator.js)
* Version: 18.1.3
* Build date: Tue May 15 2018
*
* Copyright (c) 2012 - 2018 Developer Express Inc. ALL RIGHTS RESERVED
* Read about DevExtreme licensing here: https://js.devexpress.com/Licensing/
*/
"use strict";
var $ = require("../../core/renderer"),
readyCallbacks = require("../../core/utils/ready_callbacks"),
domAdapter = require("../../core/dom_adapter"),
eventsEngine = require("../../events/core/events_engine"),
dataUtils = require("../../core/element_data"),
Class = require("../../core/class"),
extend = require("../../core/utils/extend").extend,
inArray = require("../../core/utils/array").inArray,
each = require("../../core/utils/iterator").each,
registerEvent = require("./event_registrator"),
eventUtils = require("../utils"),
pointerEvents = require("../pointer"),
wheelEvent = require("./wheel");
var MANAGER_EVENT = "dxEventManager",
EMITTER_DATA = "dxEmitter";
var EventManager = Class.inherit({
ctor: function() {
this._attachHandlers();
this.reset();
this._proxiedCancelHandler = this._cancelHandler.bind(this);
this._proxiedAcceptHandler = this._acceptHandler.bind(this)
},
_attachHandlers: function() {
readyCallbacks.add(function() {
var document = domAdapter.getDocument();
eventsEngine.subscribeGlobal(document, eventUtils.addNamespace(pointerEvents.down, MANAGER_EVENT), this._pointerDownHandler.bind(this));
eventsEngine.subscribeGlobal(document, eventUtils.addNamespace(pointerEvents.move, MANAGER_EVENT), this._pointerMoveHandler.bind(this));
eventsEngine.subscribeGlobal(document, eventUtils.addNamespace([pointerEvents.up, pointerEvents.cancel].join(" "), MANAGER_EVENT), this._pointerUpHandler.bind(this));
eventsEngine.subscribeGlobal(document, eventUtils.addNamespace(wheelEvent.name, MANAGER_EVENT), this._mouseWheelHandler.bind(this))
}.bind(this))
},
_eachEmitter: function(callback) {
var activeEmitters = this._activeEmitters || [];
var i = 0;
while (activeEmitters.length > i) {
var emitter = activeEmitters[i];
if (false === callback(emitter)) {
break
}
if (activeEmitters[i] === emitter) {
i++
}
}
},
_applyToEmitters: function(method, arg) {
this._eachEmitter(function(emitter) {
emitter[method].call(emitter, arg)
})
},
reset: function() {
this._eachEmitter(this._proxiedCancelHandler);
this._activeEmitters = []
},
resetEmitter: function(emitter) {
this._proxiedCancelHandler(emitter)
},
_pointerDownHandler: function(e) {
if (eventUtils.isMouseEvent(e) && e.which > 1) {
return
}
this._updateEmitters(e)
},
_updateEmitters: function(e) {
if (!this._isSetChanged(e)) {
return
}
this._cleanEmitters(e);
this._fetchEmitters(e)
},
_isSetChanged: function(e) {
var currentSet = this._closestEmitter(e);
var previousSet = this._emittersSet || [];
var setChanged = currentSet.length !== previousSet.length;
each(currentSet, function(index, emitter) {
setChanged = setChanged || previousSet[index] !== emitter;
return !setChanged
});
this._emittersSet = currentSet;
return setChanged
},
_closestEmitter: function(e) {
var that = this,
result = [],
$element = $(e.target);
function handleEmitter(_, emitter) {
if (!!emitter && emitter.validatePointers(e) && emitter.validate(e)) {
emitter.addCancelCallback(that._proxiedCancelHandler);
emitter.addAcceptCallback(that._proxiedAcceptHandler);
result.push(emitter)
}
}
while ($element.length) {
var emitters = dataUtils.data($element.get(0), EMITTER_DATA) || [];
each(emitters, handleEmitter);
$element = $element.parent()
}
return result
},
_acceptHandler: function(acceptedEmitter, e) {
var that = this;
this._eachEmitter(function(emitter) {
if (emitter !== acceptedEmitter) {
that._cancelEmitter(emitter, e)
}
})
},
_cancelHandler: function(canceledEmitter, e) {
this._cancelEmitter(canceledEmitter, e)
},
_cancelEmitter: function(emitter, e) {
var activeEmitters = this._activeEmitters;
if (e) {
emitter.cancel(e)
} else {
emitter.reset()
}
emitter.removeCancelCallback();
emitter.removeAcceptCallback();
var emitterIndex = inArray(emitter, activeEmitters);
if (emitterIndex > -1) {
activeEmitters.splice(emitterIndex, 1)
}
},
_cleanEmitters: function(e) {
this._applyToEmitters("end", e);
this.reset(e)
},
_fetchEmitters: function(e) {
this._activeEmitters = this._emittersSet.slice();
this._applyToEmitters("start", e)
},
_pointerMoveHandler: function(e) {
this._applyToEmitters("move", e)
},
_pointerUpHandler: function(e) {
this._updateEmitters(e)
},
_mouseWheelHandler: function(e) {
if (!this._allowInterruptionByMouseWheel()) {
return
}
e.pointers = [null];
this._pointerDownHandler(e);
this._adjustWheelEvent(e);
this._pointerMoveHandler(e);
e.pointers = [];
this._pointerUpHandler(e)
},
_allowInterruptionByMouseWheel: function() {
var allowInterruption = true;
this._eachEmitter(function(emitter) {
allowInterruption = emitter.allowInterruptionByMouseWheel() && allowInterruption;
return allowInterruption
});
return allowInterruption
},
_adjustWheelEvent: function(e) {
var closestGestureEmitter = null;
this._eachEmitter(function(emitter) {
if (!emitter.gesture) {
return
}
var direction = emitter.getDirection(e);
if ("horizontal" !== direction && !e.shiftKey || "vertical" !== direction && e.shiftKey) {
closestGestureEmitter = emitter;
return false
}
});
if (!closestGestureEmitter) {
return
}
var direction = closestGestureEmitter.getDirection(e),
verticalGestureDirection = "both" === direction && !e.shiftKey || "vertical" === direction,
prop = verticalGestureDirection ? "pageY" : "pageX";
e[prop] += e.delta
},
isActive: function(element) {
var result = false;
this._eachEmitter(function(emitter) {
result = result || emitter.getElement().is(element)
});
return result
}
});
var eventManager = new EventManager;
var EMITTER_SUBSCRIPTION_DATA = "dxEmitterSubscription";
var registerEmitter = function(emitterConfig) {
var emitterClass = emitterConfig.emitter,
emitterName = emitterConfig.events[0],
emitterEvents = emitterConfig.events;
each(emitterEvents, function(_, eventName) {
registerEvent(eventName, {
noBubble: !emitterConfig.bubble,
setup: function(element) {
var subscriptions = dataUtils.data(element, EMITTER_SUBSCRIPTION_DATA) || {},
emitters = dataUtils.data(element, EMITTER_DATA) || {},
emitter = emitters[emitterName] || new emitterClass(element);
subscriptions[eventName] = true;
emitters[emitterName] = emitter;
dataUtils.data(element, EMITTER_DATA, emitters);
dataUtils.data(element, EMITTER_SUBSCRIPTION_DATA, subscriptions)
},
add: function(element, handleObj) {
var emitters = dataUtils.data(element, EMITTER_DATA),
emitter = emitters[emitterName];
emitter.configure(extend({
delegateSelector: handleObj.selector
}, handleObj.data), handleObj.type)
},
teardown: function(element) {
var subscriptions = dataUtils.data(element, EMITTER_SUBSCRIPTION_DATA),
emitters = dataUtils.data(element, EMITTER_DATA),
emitter = emitters[emitterName];
delete subscriptions[eventName];
var disposeEmitter = true;
each(emitterEvents, function(_, eventName) {
disposeEmitter = disposeEmitter && !subscriptions[eventName];
return disposeEmitter
});
if (disposeEmitter) {
if (eventManager.isActive(element)) {
eventManager.resetEmitter(emitter)
}
emitter && emitter.dispose();
delete emitters[emitterName]
}
}
})
})
};
module.exports = registerEmitter;