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// Zepto.js | |
// (c) 2010-2016 Thomas Fuchs | |
// Zepto.js may be freely distributed under the MIT license. | |
;(function($){ | |
var touch = {}, | |
touchTimeout, tapTimeout, swipeTimeout, longTapTimeout, | |
longTapDelay = 750, | |
gesture | |
function swipeDirection(x1, x2, y1, y2) { | |
return Math.abs(x1 - x2) >= | |
Math.abs(y1 - y2) ? (x1 - x2 > 0 ? 'Left' : 'Right') : (y1 - y2 > 0 ? 'Up' : 'Down') | |
} | |
function longTap() { | |
longTapTimeout = null | |
if (touch.last) { | |
touch.el.trigger('longTap') | |
touch = {} | |
} | |
} | |
function cancelLongTap() { | |
if (longTapTimeout) clearTimeout(longTapTimeout) | |
longTapTimeout = null | |
} | |
function cancelAll() { | |
if (touchTimeout) clearTimeout(touchTimeout) | |
if (tapTimeout) clearTimeout(tapTimeout) | |
if (swipeTimeout) clearTimeout(swipeTimeout) | |
if (longTapTimeout) clearTimeout(longTapTimeout) | |
touchTimeout = tapTimeout = swipeTimeout = longTapTimeout = null | |
touch = {} | |
} | |
function isPrimaryTouch(event){ | |
return (event.pointerType == 'touch' || | |
event.pointerType == event.MSPOINTER_TYPE_TOUCH) | |
&& event.isPrimary | |
} | |
function isPointerEventType(e, type){ | |
return (e.type == 'pointer'+type || | |
e.type.toLowerCase() == 'mspointer'+type) | |
} | |
$(document).ready(function(){ | |
var now, delta, deltaX = 0, deltaY = 0, firstTouch, _isPointerType | |
if ('MSGesture' in window) { | |
gesture = new MSGesture() | |
gesture.target = document.body | |
} | |
$(document) | |
.bind('MSGestureEnd', function(e){ | |
var swipeDirectionFromVelocity = | |
e.velocityX > 1 ? 'Right' : e.velocityX < -1 ? 'Left' : e.velocityY > 1 ? 'Down' : e.velocityY < -1 ? 'Up' : null; | |
if (swipeDirectionFromVelocity) { | |
touch.el.trigger('swipe') | |
touch.el.trigger('swipe'+ swipeDirectionFromVelocity) | |
} | |
}) | |
.on('touchstart MSPointerDown pointerdown', function(e){ | |
if((_isPointerType = isPointerEventType(e, 'down')) && | |
!isPrimaryTouch(e)) return | |
firstTouch = _isPointerType ? e : e.touches[0] | |
if (e.touches && e.touches.length === 1 && touch.x2) { | |
// Clear out touch movement data if we have it sticking around | |
// This can occur if touchcancel doesn't fire due to preventDefault, etc. | |
touch.x2 = undefined | |
touch.y2 = undefined | |
} | |
now = Date.now() | |
delta = now - (touch.last || now) | |
touch.el = $('tagName' in firstTouch.target ? | |
firstTouch.target : firstTouch.target.parentNode) | |
touchTimeout && clearTimeout(touchTimeout) | |
touch.x1 = firstTouch.pageX | |
touch.y1 = firstTouch.pageY | |
if (delta > 0 && delta <= 250) touch.isDoubleTap = true | |
touch.last = now | |
longTapTimeout = setTimeout(longTap, longTapDelay) | |
// adds the current touch contact for IE gesture recognition | |
if (gesture && _isPointerType) gesture.addPointer(e.pointerId); | |
}) | |
.on('touchmove MSPointerMove pointermove', function(e){ | |
if((_isPointerType = isPointerEventType(e, 'move')) && | |
!isPrimaryTouch(e)) return | |
firstTouch = _isPointerType ? e : e.touches[0] | |
cancelLongTap() | |
touch.x2 = firstTouch.pageX | |
touch.y2 = firstTouch.pageY | |
deltaX += Math.abs(touch.x1 - touch.x2) | |
deltaY += Math.abs(touch.y1 - touch.y2) | |
}) | |
.on('touchend MSPointerUp pointerup', function(e){ | |
if((_isPointerType = isPointerEventType(e, 'up')) && | |
!isPrimaryTouch(e)) return | |
cancelLongTap() | |
// swipe | |
if ((touch.x2 && Math.abs(touch.x1 - touch.x2) > 30) || | |
(touch.y2 && Math.abs(touch.y1 - touch.y2) > 30)) | |
swipeTimeout = setTimeout(function() { | |
touch.el.trigger('swipe') | |
touch.el.trigger('swipe' + (swipeDirection(touch.x1, touch.x2, touch.y1, touch.y2))) | |
touch = {} | |
}, 0) | |
// normal tap | |
else if ('last' in touch) | |
// don't fire tap when delta position changed by more than 30 pixels, | |
// for instance when moving to a point and back to origin | |
if (deltaX < 30 && deltaY < 30) { | |
// delay by one tick so we can cancel the 'tap' event if 'scroll' fires | |
// ('tap' fires before 'scroll') | |
tapTimeout = setTimeout(function() { | |
// trigger universal 'tap' with the option to cancelTouch() | |
// (cancelTouch cancels processing of single vs double taps for faster 'tap' response) | |
var event = $.Event('tap') | |
event.cancelTouch = cancelAll | |
touch.el.trigger(event) | |
// trigger double tap immediately | |
if (touch.isDoubleTap) { | |
if (touch.el) touch.el.trigger('doubleTap') | |
touch = {} | |
} | |
// trigger single tap after 250ms of inactivity | |
else { | |
touchTimeout = setTimeout(function(){ | |
touchTimeout = null | |
if (touch.el) touch.el.trigger('singleTap') | |
touch = {} | |
}, 250) | |
} | |
}, 0) | |
} else { | |
touch = {} | |
} | |
deltaX = deltaY = 0 | |
}) | |
// when the browser window loses focus, | |
// for example when a modal dialog is shown, | |
// cancel all ongoing events | |
.on('touchcancel MSPointerCancel pointercancel', cancelAll) | |
// scrolling the window indicates intention of the user | |
// to scroll, not tap or swipe, so cancel all ongoing events | |
$(window).on('scroll', cancelAll) | |
}) | |
;['swipe', 'swipeLeft', 'swipeRight', 'swipeUp', 'swipeDown', | |
'doubleTap', 'tap', 'singleTap', 'longTap'].forEach(function(eventName){ | |
$.fn[eventName] = function(callback){ return this.on(eventName, callback) } | |
}) | |
})(Zepto) |