alloytouch
Version:
super tiny size touch and physical motion library for the web
364 lines (325 loc) • 15.8 kB
JavaScript
/* AlloyTouch v0.1.3
* By AlloyTeam http://www.alloyteam.com/
* Github: https://github.com/AlloyTeam/AlloyTouch
* MIT Licensed.
*/
;(function () {
'use strict';
if (!Date.now)
Date.now = function () { return new Date().getTime(); };
var vendors = ['webkit', 'moz'];
for (var i = 0; i < vendors.length && !window.requestAnimationFrame; ++i) {
var vp = vendors[i];
window.requestAnimationFrame = window[vp + 'RequestAnimationFrame'];
window.cancelAnimationFrame = (window[vp + 'CancelAnimationFrame']
|| window[vp + 'CancelRequestAnimationFrame']);
}
if (/iP(ad|hone|od).*OS 6/.test(window.navigator.userAgent) // iOS6 is buggy
|| !window.requestAnimationFrame || !window.cancelAnimationFrame) {
var lastTime = 0;
window.requestAnimationFrame = function (callback) {
var now = Date.now();
var nextTime = Math.max(lastTime + 16, now);
return setTimeout(function () { callback(lastTime = nextTime); },
nextTime - now);
};
window.cancelAnimationFrame = clearTimeout;
}
}());
(function () {
function bind(element, type, callback) {
element.addEventListener(type, callback, false);
}
function ease(x) {
return Math.sqrt(1 - Math.pow(x - 1, 2));
}
function reverseEase(y) {
return 1 - Math.sqrt(1 - y * y);
}
function preventDefaultTest(el, exceptions) {
for (var i in exceptions) {
if (exceptions[i].test(el[i])) {
return true;
}
}
return false;
}
var AlloyTouch = function (option) {
this.target = option.target;
this.element = typeof option.touch === "string" ? document.querySelector(option.touch) : option.touch;
this.vertical = this._getValue(option.vertical, true);
this.property = option.property;
this.tickID = 0;
this.value = this._getValue(option.value, this.target[this.property]);
this.target[this.property] = this.value;
this.sensitivity = this._getValue(option.sensitivity, 1);
this.moveFactor = this._getValue(option.moveFactor, 1);
this.factor = this._getValue(option.factor, 1);
this.outFactor = this._getValue(option.outFactor, 0.3);
this.min = option.min;
this.max = option.max;
this.deceleration = 0.0006;
this.maxRegion = this._getValue(option.maxRegion, 60);
var noop = function () { };
this.change = option.change || noop;
this.touchEnd = option.touchEnd || noop;
this.touchStart = option.touchStart || noop;
this.touchMove = option.touchMove || noop;
this.touchCancel = option.touchCancel || noop;
this.reboundEnd = option.reboundEnd || noop;
this.animationEnd = option.animationEnd || noop;
this.correctionEnd = option.correctionEnd || noop;
this.preventDefault = this._getValue(option.preventDefault, true);
this.preventDefaultException = { tagName: /^(INPUT|TEXTAREA|BUTTON|SELECT)$/ };
this.hasMin = !(this.min === undefined);
this.hasMax = !(this.max === undefined);
if (this.hasMin && this.hasMax && this.min > this.max) {
throw "the min value can't be greater than the max value."
}
this.isTouchStart = false;
this.step = option.step;
this.inertia = this._getValue(option.inertia, true);
this._calculateIndex();
bind(this.element, "touchstart", this._start.bind(this));
bind(window, "touchmove", this._move.bind(this));
bind(window, "touchend", this._end.bind(this));
bind(window, "touchcancel", this._cancel.bind(this));
this.refreshOption = option.refreshOption;
this._initRefresh();
};
AlloyTouch.prototype = {
_initRefresh:function () {
var option = this.refreshOption;
if(!option) return;
this.refreshPoint = option.refreshPoint;
this.refreshingPoint = option.refreshingPoint;
this.refreshTip = typeof option.refreshTip === "string" ? document.querySelector(option.refreshTip) : option.refreshTip;
Transform(this.refreshTip,true);
var noop = function () { };
this.refresh = option.refresh || noop;
this.inRefreshPoint = option.inRefreshPoint || noop;
this.outRefreshPoint = option.outRefreshPoint || noop;
this.refreshState ={
PTR:"PTR",
RTR:"RTR",
RING:"RING"
};
this.currentState = this.refreshState.PTR;
},
_getValue: function (obj, defaultValue) {
return obj === undefined ? defaultValue : obj;
},
_start: function (evt) {
this.isTouchStart = true;
this._firstTouchMove = true;
this._preventMoveDefault = true;
this.touchStart.call(this, evt, this.target[this.property]);
cancelAnimationFrame(this.tickID);
this._calculateIndex();
this.startTime = new Date().getTime();
this._startX = this.preX = evt.touches[0].pageX;
this._startY = this.preY = evt.touches[0].pageY;
this.start = this.vertical ? this.preY : this.preX;
},
_move: function (evt) {
if (this.isTouchStart) {
if (this._firstTouchMove) {
var dDis = Math.abs(evt.touches[0].pageX - this._startX) - Math.abs(evt.touches[0].pageY - this._startY);
if (dDis > 0 && this.vertical) {
this._preventMoveDefault = false;
} else if (dDis < 0 && !this.vertical) {
this._preventMoveDefault = false;
}
this._firstTouchMove = false;
}
if (this._preventMoveDefault) {
var d = (this.vertical ? evt.touches[0].pageY - this.preY : evt.touches[0].pageX - this.preX) * this.sensitivity;
var f = this.moveFactor;
if (this.hasMax && this.target[this.property] > this.max && d > 0) {
f = this.outFactor;
} else if (this.hasMin && this.target[this.property] < this.min && d < 0) {
f = this.outFactor;
}
d *= f;
this.preX = evt.touches[0].pageX;
this.preY = evt.touches[0].pageY;
// if(this.target[this.property]+d>=0) {
this.target[this.property] += d;
evt.preventDefault();
//}
this.change.call(this, this.target[this.property]);
this.refreshTip[this.property] = this.target[this.property];
var timestamp = new Date().getTime();
if (timestamp - this.startTime > 300) {
this.startTime = timestamp;
this.start = this.vertical ? this.preY : this.preX;
}
this.touchMove.call(this, evt, this.target[this.property]);
if(this.currentState!==this.refreshState.RING) {
if (this.target[this.property] > this.refreshPoint && this.currentState===this.refreshState.PTR) {
this.currentState=this.refreshState.RTR;
this.inRefreshPoint.call(this);
}
if (this.target[this.property] < this.refreshPoint &&this.currentState===this.refreshState.RTR) {
this.currentState=this.refreshState.PTR;
this.outRefreshPoint.call(this);
}
}
evt.preventDefault();
}
}
},
_cancel: function (evt) {
var current = this.target[this.property];
this.touchCancel.call(this, evt, current);
if (this.hasMax && current > this.max) {
this._to(this.max, 200, ease, this.change, function (value) {
this.reboundEnd.call(this, value);
this.animationEnd.call(this, value);
}.bind(this));
} else if (this.hasMin && current < this.min) {
this._to(this.min, 200, ease, this.change, function (value) {
this.reboundEnd.call(this, value);
this.animationEnd.call(this, value);
}.bind(this));
} else {
this._correction();
}
},
to: function (v, time, user_ease) {
this._to(v, this._getValue(time, 600), user_ease || ease, this.change, function (value) {
this._calculateIndex();
this.reboundEnd.call(this, value);
this.animationEnd.call(this, value);
}.bind(this));
},
_calculateIndex: function () {
if (this.hasMax && this.hasMin) {
this.currentPage = Math.round((this.max - this.target[this.property]) / this.step);
}
},
_end: function (evt) {
if (this.isTouchStart && this._preventMoveDefault) {
this.isTouchStart = false;
var self = this,
current = this.target[this.property];
if (this.touchEnd.call(this, evt, current, this.currentPage) === false) return;
if(current>this.refreshPoint) {
if( this.currentState!== this.refreshState.RING) {
this.refresh();
this.currentState = this.refreshState.RING;
}
this._to(this.refreshingPoint, 600, ease, this.change, function (value) {
}.bind(this));
}else if (this.hasMax && current > this.max) {
this._to(this.max, 200, ease, this.change, function (value) {
this.reboundEnd.call(this, value);
this.animationEnd.call(this, value);
}.bind(this));
} else if (this.hasMin && current < this.min) {
this._to(this.min, 200, ease, this.change, function (value) {
this.reboundEnd.call(this, value);
this.animationEnd.call(this, value);
}.bind(this));
} else if (this.inertia) {
//var y = evt.changedTouches[0].pageY;
var dt = new Date().getTime() - this.startTime;
if (dt < 300) {
var distance = ((this.vertical ? evt.changedTouches[0].pageY : evt.changedTouches[0].pageX) - this.start) * this.sensitivity,
speed = Math.abs(distance) / dt,
speed2 = this.factor * speed,
destination = current + (speed2 * speed2) / (2 * this.deceleration) * (distance < 0 ? -1 : 1);
var tRatio = 1;
if (destination < this.min - this.maxRegion) {
tRatio = reverseEase((current - this.min + this.maxRegion) / (current - destination));
destination = this.min - this.maxRegion;
} else if (destination > this.max + this.maxRegion) {
tRatio = reverseEase((this.max + this.maxRegion - current) / (destination - current));
destination = this.max + this.maxRegion;
}
var duration = Math.round(speed / self.deceleration) * tRatio;
self._to(Math.round(destination), duration, ease, self.change, function (value) {
if (self.hasMax && self.target[self.property] > self.max) {
cancelAnimationFrame(self.tickID);
self._to(self.max, 600, ease, self.change, self.animationEnd);
} else if (self.hasMin && self.target[self.property] < self.min) {
cancelAnimationFrame(self.tickID);
self._to(self.min, 600, ease, self.change, self.animationEnd);
} else {
self._correction();
}
self.change.call(this, value);
});
} else {
self._correction();
}
} else {
self._correction();
}
if (this.preventDefault && !preventDefaultTest(evt.target, this.preventDefaultException)) {
evt.preventDefault();
}
}
},
refreshEnd:function () {
this.currentState = this.refreshState.PTR;
this.currentState=this.refreshState.PTR;
this.outRefreshPoint.call(this);
this._to(this.max, 600, ease, this.change, function (value) {
this._calculateIndex();
this.correctionEnd.call(this, value);
this.animationEnd.call(this, value);
}.bind(this));
},
_to: function (value, time, ease, onChange, onEnd) {
var el = this.target,
property = this.property;
var current = el[property];
var dv = value - current;
var beginTime = new Date();
var self = this;
var toTick = function () {
var dt = new Date() - beginTime;
if (dt >= time) {
el[property] = value;
onChange && onChange.call(self, value);
self.refreshTip[self.property] = self.target[self.property];
onEnd && onEnd.call(self, value);
return;
}
el[property] = dv * ease(dt / time) + current;
self.tickID = requestAnimationFrame(toTick);
//cancelAnimationFrame必须在 tickID = requestAnimationFrame(toTick);的后面
onChange && onChange.call(self, el[property]);
self.refreshTip[self.property] = self.target[self.property];
};
toTick();
},
_correction: function () {
if (this.step === undefined) return;
var el = this.target,
property = this.property;
var value = el[property];
var rpt = Math.floor(Math.abs(value / this.step));
var dy = value % this.step;
if (Math.abs(dy) > this.step / 2) {
this._to((value < 0 ? -1 : 1) * (rpt + 1) * this.step, 400, ease, this.change, function (value) {
this._calculateIndex();
this.correctionEnd.call(this, value);
this.animationEnd.call(this, value);
}.bind(this));
} else {
this._to((value < 0 ? -1 : 1) * rpt * this.step, 400, ease, this.change, function (value) {
this._calculateIndex();
this.correctionEnd.call(this, value);
this.animationEnd.call(this, value);
}.bind(this));
}
}
};
if (typeof module !== 'undefined' && typeof exports === 'object') {
module.exports = AlloyTouch;
} else {
window.AlloyTouch = AlloyTouch;
}
})();