/*!
The MIT License (MIT)
Copyright (c) 2014-current Andrea Giammarchi
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/
/*
CSS
Disables all pan/zoom behaviors and fire pointer events in JavaScript instead.
.disablePanZoom {
-ms-touch-action: none;
touch-action: none;
}
JS
Disables text selection
element.addEventListener("selectstart", function(e) { e.preventDefault(); }, false);
*/
(function (navigator, document, pointerEnabled) {
// highly experimental, should work on IE10 and IE11 only
// normal IE mouse events won't be affected
if (!(
(pointerEnabled = !!navigator.pointerEnabled) ||
navigator.msPointerEnabled
) ||
'ontouchend' in document
) return;
var
// shortcuts
ADD_EVENT_LISTENER = 'addEventListener',
REMOVE_EVENT_LISTENER = 'removeEventListener',
// used to force-simulate touch
SET_CURRENT_CAPTURE = pointerEnabled ?
'setPointerCapture' : 'msSetPointerCapture',
RELEASE_CURRENT_CAPTURE = pointerEnabled ?
'releasePointerCapture' : 'msReleasePointerCapture',
// shortcut for common replacements
ElementPrototype = Element.prototype,
defineProperties = Object.defineProperties,
defineProperty = Object.defineProperty,
// for types too
type = function (type) {
var lo = type.toLowerCase(),
ms = 'MS' + type;
handler[ms] = handler[lo];
return pointerEnabled ? lo: ms;
},
// these are calls to the passed event
commonMethod = function (name) {
return {
value: function () {
Event[name].call(this);
this._[name]();
}
};
},
// DOM Level 0 accessors
createAccessor = function (type) {
var ontype = '_on' + type;
return {
enumerable: true,
configurable: true,
get: function () {
return this[ontype] || null;
},
set: function (callback) {
if (this[ontype]) {
this[REMOVE_EVENT_LISTENER](type, this[ontype]);
}
this[ontype] = callback;
if (callback) {
this[ADD_EVENT_LISTENER](type, callback);
}
}
};
},
// these are common DOM overrides
commonOverride = function (proto, name) {
var original = proto[name];
defineProperty(proto, name, {
configurable: true,
value: function (type, eventHandler, capture) {
if (type in types) {
original.call(
this,
types[type],
handleEvent,
capture
);
}
original.call(this, type, eventHandler, capture);
}
});
},
// these are delegated properties
commonProperty = function (name) {
return {
get: function () {
return this._[name];
}
};
},
// generates similar functions for similar cases
upOrCancel = function (type) {
return function (e) {
var pointerId = e.pointerId,
touch = touches[pointerId],
currentTarget = e.currentTarget;
delete touches[pointerId];
if (RELEASE_CURRENT_CAPTURE in currentTarget) {
currentTarget[RELEASE_CURRENT_CAPTURE](e.pointerId);
}
dispatchEvent(type, e, touch);
delete changedTouches[pointerId];
};
},
// shortcut for all events
dispatchEvent = function (type, e, touch) {
var c = document.createEvent('Event');
c.initEvent(type, true, true);
_.value = e;
TouchEventProperties.currentTarget.value = touch.currentTarget;
defineProperties(c, TouchEventProperties);
touch.currentTarget.dispatchEvent(c);
},
get = function (name, object) {
function returnID(id) {
return object[id];
}
return function get() {
_.value = Object.keys(object).map(returnID);
return defineProperty(this, name, _)[name];
};
},
// basically says if it's touch or not
humanReadablePointerType = function (e) {
switch(e.pointerType) {
case 'mouse':
case e.MSPOINTER_TYPE_MOUSE:
return 'mouse';
}
// pen is just fine as touch
return 'touch';
},
// recycle common descriptors too
_ = {value: null},
// the list of touches / changedTouches
touches = Object.create(null),
changedTouches = Object.create(null),
// TODO: targetTouches = Object.create(null),
Event = document.createEvent('Event'),
// all properties per each event
// defined at runtime .. not so fast
// but still OKish in terms of RAM and CPU
TouchEventProperties = {
_: _,
touches: {
configurable: true,
get: get('touches', touches)
},
changedTouches: {
configurable: true,
get: get('changedTouches', changedTouches)
},
currentTarget: {value:null},
// almost everything is mirrored
relatedTarget: commonProperty('relatedTarget'),
target: commonProperty('target'),
altKey: commonProperty('altKey'),
metaKey: commonProperty('metaKey'),
ctrlKey: commonProperty('ctrlKey'),
shiftKey: commonProperty('shiftKey'),
// including methods
preventDefault: commonMethod('preventDefault'),
stopPropagation: commonMethod('stopPropagation'),
stopImmediatePropagation: commonMethod('stopImmediatePropagation')
},
// all types translated
types = Object.create(null),
// boosted up eventListener
handleEvent = function (e) {
if (humanReadablePointerType(e) === 'touch') {
// invoke normalized methods
handler[e.type](e);
}
},
// the unique handler for all the things
handler = {
pointerdown: function (e) {
var touch = new Touch(e),
pointerId = e.pointerId,
currentTarget = e.currentTarget;
changedTouches[pointerId] = touches[pointerId] = touch;
if (SET_CURRENT_CAPTURE in currentTarget) {
currentTarget[SET_CURRENT_CAPTURE](e.pointerId);
}
dispatchEvent('touchstart', e, touch);
},
pointermove: function (e) {
var pointerId = e.pointerId,
touch = touches[pointerId];
touch._ = e;
dispatchEvent('touchmove', e, touch);
changedTouches[pointerId]._ = e;
},
pointerup: upOrCancel('touchend'),
pointercancel: upOrCancel('touchcancel')
},
accessors = {
ontouchstart: createAccessor('touchstart'),
ontouchmove: createAccessor('touchmove'),
ontouchend: createAccessor('touchend'),
ontouchcancel: createAccessor('touchcancel')
}
;
// facade for initial events info
function Touch(_) {
// the event needs to be refreshed
// each touchmove
this._ = _;
this.currentTarget = _.currentTarget;
}
// all common properties
defineProperties(
Touch.prototype,
{
identifier: commonProperty('pointerId'),
target: commonProperty('target'),
screenX: commonProperty('screenX'),
screenY: commonProperty('screenY'),
clientX: commonProperty('clientX'),
clientY: commonProperty('clientY'),
pageX: commonProperty('pageX'),
pageY: commonProperty('pageY')
}
);
types.touchstart = type('PointerDown');
types.touchmove = type('PointerMove');
types.touchend = type('PointerUp');
types.touchcancel = type('PointerCancel');
commonOverride(document, ADD_EVENT_LISTENER);
commonOverride(document, REMOVE_EVENT_LISTENER);
commonOverride(ElementPrototype, ADD_EVENT_LISTENER);
commonOverride(ElementPrototype, REMOVE_EVENT_LISTENER);
// make these available as DOM Level 0
defineProperties(document, accessors);
defineProperties(ElementPrototype, accessors);
}(navigator, document));