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mithril-touch, consume touch and mouse events evenly with mithril
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/***************************************** | |
/* DOM touch support module | |
/*****************************************/ | |
if (!window.CustomEvent) { | |
window.CustomEvent = function (event, params) { | |
params = params || { bubbles: false, cancelable: false, detail: undefined }; | |
var evt = document.createEvent('CustomEvent'); | |
evt.initCustomEvent(event, params.bubbles, params.cancelable, params.detail); | |
return evt; | |
}; | |
window.CustomEvent.prototype = window.Event.prototype; | |
} | |
(function(document) { | |
var TAPTRESHOLD = 200, // time within a double tap should have happend | |
TAPPRECISION = 60 / 2, // distance to identify a swipe gesture | |
touch = { }, | |
tapCount = 0, // counts the number of touchstart events | |
tapTimer = 0, // timer to detect double tap | |
isTouchSwipe = false, // set to true whenever | |
absolute = Math.abs, | |
PANTRESHOLD = 5, // pan treshold | |
horizontalPanStates = 'ENDED', // States are BEGAN, PROGRESS, ENDED | |
verticalPanStates = 'ENDED', | |
panStartTime = 0, | |
panEndTime = 0, | |
touchSupported = 'ontouchstart' in window; | |
function parentIfText (node) { | |
return 'tagName' in node ? node : node.parentNode; | |
} | |
function dispatchEvent(type, touch) { | |
if(touchSupported) { | |
touch.originalEvent.preventDefault(); | |
touch.originalEvent.stopImmediatePropagation(); | |
} | |
var event = new CustomEvent(type, { | |
detail: touch, | |
bubbles: true, | |
cancelable: true | |
}); | |
touch.target.dispatchEvent(event); | |
//console.log(type); | |
touch = { }; | |
tapCount = 0; | |
return event; | |
} | |
function touchStart(e) { | |
if( !touchSupported || e.touches.length === 1) { | |
var coords = e.targetTouches ? e.targetTouches[0] : e; | |
touch = { | |
originalEvent: e, | |
target: parentIfText(e.target), | |
x1: coords.pageX, | |
y1: coords.pageY, | |
x2: coords.pageX, | |
y2: coords.pageY, | |
lastX: coords.pageX, | |
lastY: coords.pageY, | |
panDuration: 0 | |
}; | |
isTouchSwipe = false; | |
tapCount++; | |
if (!e.button || e.button === 1) { | |
clearTimeout(tapTimer); | |
tapTimer = setTimeout(function() { | |
if(absolute(touch.x2 - touch.x1) < TAPPRECISION && | |
absolute(touch.y2 - touch.y2) < TAPPRECISION && | |
!isTouchSwipe) { | |
dispatchEvent((tapCount===2)? 'dbltap' : 'tap', touch); | |
clearTimeout(tapTimer); | |
} | |
tapCount = 0; | |
}, TAPTRESHOLD); | |
} | |
} | |
} | |
function touchMove(e) { | |
var coords = e.changedTouches ? e.changedTouches[0] : e; | |
isTouchSwipe = true; | |
touch.x2 = coords.pageX; | |
touch.y2 = coords.pageY; | |
var distX = touch.lastX - touch.x2, | |
distY = touch.lastY - touch.y2, | |
absX = absolute(distX), | |
absY = absolute(distY); | |
touch.lastX = touch.x2; | |
touch.lastY = touch.y2; | |
if (absY > PANTRESHOLD && verticalPanStates === 'ENDED') { | |
touch.translation = distY; | |
panStartTime = Date.now(); | |
dispatchEvent('verticalPanStart', touch); | |
verticalPanStates = 'PROGRESS'; | |
} | |
if (absX > PANTRESHOLD && horizontalPanStates === 'ENDED') { | |
touch.translation = distX; | |
panStartTime = Date.now(); | |
dispatchEvent('horizontalPanStart', touch); | |
horizontalPanStates = 'PROGRESS'; | |
} | |
if(absY && verticalPanStates === 'PROGRESS') { | |
touch.translation = distY; | |
dispatchEvent('verticalPanChange', touch); | |
} | |
if(absX && horizontalPanStates === 'PROGRESS') { | |
touch.translation = distX; | |
dispatchEvent('horizontalPanChange', touch); | |
} | |
/* the following is obsolete since at least chrome handles this | |
// if movement is detected within 200ms from start, preventDefault to preserve browser scroll etc. | |
// if (touch.target && | |
// (absolute(touch.y2 - touch.y1) <= TAPPRECISION || | |
// absolute(touch.x2 - touch.x1) <= TAPPRECISION) | |
// ) { | |
// e.preventDefault(); | |
// touchCancel(e); | |
// } | |
*/ | |
} | |
function touchCancel(e) { | |
touch = {}; | |
tapCount = 0; | |
isTouchSwipe = false; | |
console.log("touchCancel"); | |
} | |
function touchEnd(e) { | |
var distX = touch.x2 - touch.x1, | |
distY = touch.y2 - touch.y1, | |
absX = absolute(distX), | |
absY = absolute(distY); | |
// use setTimeout here to register swipe over tap correctly, | |
// otherwise a tap would be fired immediatly after a swipe | |
setTimeout(function() { | |
isTouchSwipe = false; | |
},0); | |
panEndTime = Date.now(); | |
touch.panDuration = (panStartTime - panEndTime) / 1000; | |
if (verticalPanStates === 'PROGRESS') { | |
touch.translation = distY; | |
dispatchEvent('verticalPanEnd', touch); | |
verticalPanStates = 'ENDED'; | |
} | |
if (horizontalPanStates === 'PROGRESS') { | |
touch.translation = distX; | |
dispatchEvent('horizontalPanEnd', touch); | |
horizontalPanStates = 'ENDED'; | |
} | |
// if there was swipe movement, resolve the direction of swipe | |
if(absX || absY) { | |
if(absX > absY) { | |
dispatchEvent((distX<0)? 'swipeleft': 'swiperight', touch); | |
} else { | |
dispatchEvent((distY<0)? 'swipeup': 'swipedown', touch); | |
} | |
} | |
} | |
document.addEventListener(touchSupported ? 'touchstart' : 'mousedown', touchStart, false); | |
document.addEventListener(touchSupported ? 'touchmove' : 'mousemove', touchMove, false); | |
document.addEventListener(touchSupported ? 'touchend' : 'mouseup', touchEnd, false); | |
// on touch devices, the taphold complies with contextmenu | |
document.addEventListener('contextmenu', function(e) { | |
e.preventDefault(); | |
e.stopImmediatePropagation(); | |
dispatchEvent('taphold', { | |
originalEvent: e, | |
target: parentIfText(e.target) | |
}); | |
}, false); | |
if (touchSupported) { | |
document.addEventListener('touchcancel', touchCancel, false); | |
} | |
}(window.document)); |
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