devextreme
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HTML5 JavaScript Component Suite for Responsive Web Development
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JavaScript
/**
* DevExtreme (cjs/events/gesture/emitter.gesture.scroll.js)
* Version: 21.2.4
* Build date: Mon Dec 06 2021
*
* Copyright (c) 2012 - 2021 Developer Express Inc. ALL RIGHTS RESERVED
* Read about DevExtreme licensing here: https://js.devexpress.com/Licensing/
*/
"use strict";
exports.default = void 0;
var _events_engine = _interopRequireDefault(require("../../events/core/events_engine"));
var _class = _interopRequireDefault(require("../../core/class"));
var _index = require("../../events/utils/index");
var _emitter = _interopRequireDefault(require("../../events/gesture/emitter.gesture"));
var _emitter_registrator = _interopRequireDefault(require("../../events/core/emitter_registrator"));
var _frame = require("../../animation/frame");
var _devices = _interopRequireDefault(require("../../core/devices"));
var _version = require("../../core/utils/version");
function _interopRequireDefault(obj) {
return obj && obj.__esModule ? obj : {
default: obj
}
}
var abstract = _class.default.abstract;
var realDevice = _devices.default.real();
var SCROLL_EVENT = "scroll";
var SCROLL_INIT_EVENT = "dxscrollinit";
var SCROLL_START_EVENT = "dxscrollstart";
var SCROLL_MOVE_EVENT = "dxscroll";
var SCROLL_END_EVENT = "dxscrollend";
var SCROLL_STOP_EVENT = "dxscrollstop";
var SCROLL_CANCEL_EVENT = "dxscrollcancel";
var Locker = _class.default.inherit(function() {
var NAMESPACED_SCROLL_EVENT = (0, _index.addNamespace)(SCROLL_EVENT, "dxScrollEmitter");
return {
ctor: function(element) {
var _this = this;
this._element = element;
this._locked = false;
this._proxiedScroll = function(e) {
if (!_this._disposed) {
_this._scroll(e)
}
};
_events_engine.default.on(this._element, NAMESPACED_SCROLL_EVENT, this._proxiedScroll)
},
_scroll: abstract,
check: function(e, callback) {
if (this._locked) {
callback()
}
},
dispose: function() {
this._disposed = true;
_events_engine.default.off(this._element, NAMESPACED_SCROLL_EVENT, this._proxiedScroll)
}
}
}());
var TimeoutLocker = Locker.inherit({
ctor: function(element, timeout) {
this.callBase(element);
this._timeout = timeout
},
_scroll: function() {
this._prepare();
this._forget()
},
_prepare: function() {
if (this._timer) {
this._clearTimer()
}
this._locked = true
},
_clearTimer: function() {
clearTimeout(this._timer);
this._locked = false;
this._timer = null
},
_forget: function() {
var that = this;
this._timer = setTimeout((function() {
that._clearTimer()
}), this._timeout)
},
dispose: function() {
this.callBase();
this._clearTimer()
}
});
var WheelLocker = TimeoutLocker.inherit({
ctor: function(element) {
this.callBase(element, 400);
this._lastWheelDirection = null
},
check: function(e, callback) {
this._checkDirectionChanged(e);
this.callBase(e, callback)
},
_checkDirectionChanged: function(e) {
if (!(0, _index.isDxMouseWheelEvent)(e)) {
this._lastWheelDirection = null;
return
}
var direction = e.shiftKey || false;
var directionChange = null !== this._lastWheelDirection && direction !== this._lastWheelDirection;
this._lastWheelDirection = direction;
this._locked = this._locked && !directionChange
}
});
var PointerLocker = TimeoutLocker.inherit({
ctor: function(element) {
this.callBase(element, 400)
}
});
! function() {
var ios8_greater = realDevice.ios && (0, _version.compare)(realDevice.version, [8]) >= 0;
var android5_greater = realDevice.android && (0, _version.compare)(realDevice.version, [5]) >= 0;
if (!(ios8_greater || android5_greater)) {
return
}
PointerLocker = Locker.inherit({
_scroll: function() {
this._locked = true;
var that = this;
(0, _frame.cancelAnimationFrame)(this._scrollFrame);
this._scrollFrame = (0, _frame.requestAnimationFrame)((function() {
that._locked = false
}))
},
check: function(e, callback) {
(0, _frame.cancelAnimationFrame)(this._scrollFrame);
(0, _frame.cancelAnimationFrame)(this._checkFrame);
var that = this;
var callBase = this.callBase;
this._checkFrame = (0, _frame.requestAnimationFrame)((function() {
callBase.call(that, e, callback);
that._locked = false
}))
},
dispose: function() {
this.callBase();
(0, _frame.cancelAnimationFrame)(this._scrollFrame);
(0, _frame.cancelAnimationFrame)(this._checkFrame)
}
})
}();
var ScrollEmitter = _emitter.default.inherit(function() {
var FRAME_DURATION = Math.round(1e3 / 60);
return {
ctor: function(element) {
this.callBase.apply(this, arguments);
this.direction = "both";
this._pointerLocker = new PointerLocker(element);
this._wheelLocker = new WheelLocker(element)
},
validate: function() {
return true
},
configure: function(data) {
if (data.scrollTarget) {
this._pointerLocker.dispose();
this._wheelLocker.dispose();
this._pointerLocker = new PointerLocker(data.scrollTarget);
this._wheelLocker = new WheelLocker(data.scrollTarget)
}
this.callBase(data)
},
_init: function(e) {
this._wheelLocker.check(e, function() {
if ((0, _index.isDxMouseWheelEvent)(e)) {
this._accept(e)
}
}.bind(this));
this._pointerLocker.check(e, function() {
var skipCheck = this.isNative && (0, _index.isMouseEvent)(e);
if (!(0, _index.isDxMouseWheelEvent)(e) && !skipCheck) {
this._accept(e)
}
}.bind(this));
this._fireEvent(SCROLL_INIT_EVENT, e);
this._prevEventData = (0, _index.eventData)(e)
},
move: function(e) {
this.callBase.apply(this, arguments);
e.isScrollingEvent = this.isNative || e.isScrollingEvent
},
_start: function(e) {
this._savedEventData = (0, _index.eventData)(e);
this._fireEvent(SCROLL_START_EVENT, e);
this._prevEventData = (0, _index.eventData)(e)
},
_move: function(e) {
var currentEventData = (0, _index.eventData)(e);
this._fireEvent(SCROLL_MOVE_EVENT, e, {
delta: (0, _index.eventDelta)(this._prevEventData, currentEventData)
});
var delta = (0, _index.eventDelta)(this._savedEventData, currentEventData);
if (delta.time > 200) {
this._savedEventData = this._prevEventData
}
this._prevEventData = (0, _index.eventData)(e)
},
_end: function(e) {
var endEventDelta = (0, _index.eventDelta)(this._prevEventData, (0, _index.eventData)(e));
var velocity = {
x: 0,
y: 0
};
if (!(0, _index.isDxMouseWheelEvent)(e) && endEventDelta.time < 100) {
var delta = (0, _index.eventDelta)(this._savedEventData, this._prevEventData);
var velocityMultiplier = FRAME_DURATION / delta.time;
velocity = {
x: delta.x * velocityMultiplier,
y: delta.y * velocityMultiplier
}
}
this._fireEvent(SCROLL_END_EVENT, e, {
velocity: velocity
})
},
_stop: function(e) {
this._fireEvent(SCROLL_STOP_EVENT, e)
},
cancel: function(e) {
this.callBase.apply(this, arguments);
this._fireEvent(SCROLL_CANCEL_EVENT, e)
},
dispose: function() {
this.callBase.apply(this, arguments);
this._pointerLocker.dispose();
this._wheelLocker.dispose()
},
_clearSelection: function() {
if (this.isNative) {
return
}
return this.callBase.apply(this, arguments)
},
_toggleGestureCover: function() {
if (this.isNative) {
return
}
return this.callBase.apply(this, arguments)
}
}
}());
(0, _emitter_registrator.default)({
emitter: ScrollEmitter,
events: [SCROLL_INIT_EVENT, SCROLL_START_EVENT, SCROLL_MOVE_EVENT, SCROLL_END_EVENT, SCROLL_STOP_EVENT, SCROLL_CANCEL_EVENT]
});
var _default = {
init: SCROLL_INIT_EVENT,
start: SCROLL_START_EVENT,
move: SCROLL_MOVE_EVENT,
end: SCROLL_END_EVENT,
stop: SCROLL_STOP_EVENT,
cancel: SCROLL_CANCEL_EVENT,
scroll: SCROLL_EVENT
};
exports.default = _default;
module.exports = exports.default;
module.exports.default = exports.default;