/* AlloyFinger v0.1.7
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* By dntzhang
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* Github: https://github.com/AlloyTeam/AlloyFinger
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*/
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; (function () {
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function getLen(v) {
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return Math.sqrt(v.x * v.x + v.y * v.y);
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}
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function dot(v1, v2) {
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return v1.x * v2.x + v1.y * v2.y;
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}
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function getAngle(v1, v2) {
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var mr = getLen(v1) * getLen(v2);
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if (mr === 0) return 0;
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var r = dot(v1, v2) / mr;
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if (r > 1) r = 1;
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return Math.acos(r);
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}
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function cross(v1, v2) {
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return v1.x * v2.y - v2.x * v1.y;
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}
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function getRotateAngle(v1, v2) {
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var angle = getAngle(v1, v2);
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if (cross(v1, v2) > 0) {
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angle *= -1;
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}
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return angle * 180 / Math.PI;
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}
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var HandlerAdmin = function(el) {
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this.handlers = [];
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this.el = el;
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};
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HandlerAdmin.prototype.add = function(handler) {
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this.handlers.push(handler);
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}
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HandlerAdmin.prototype.del = function(handler) {
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if(!handler) this.handlers = [];
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for(var i=this.handlers.length; i>=0; i--) {
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if(this.handlers[i] === handler) {
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this.handlers.splice(i, 1);
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}
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}
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}
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HandlerAdmin.prototype.dispatch = function() {
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for(var i=0,len=this.handlers.length; i<len; i++) {
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var handler = this.handlers[i];
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if(typeof handler === 'function') handler.apply(this.el, arguments);
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}
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}
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function wrapFunc(el, handler) {
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var handlerAdmin = new HandlerAdmin(el);
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handlerAdmin.add(handler);
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return handlerAdmin;
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}
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var AlloyFinger = function (el, option) {
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this.element = typeof el == 'string' ? document.querySelector(el) : el;
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this.start = this.start.bind(this);
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this.move = this.move.bind(this);
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this.end = this.end.bind(this);
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this.cancel = this.cancel.bind(this);
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this.element.addEventListener("touchstart", this.start, false);
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this.element.addEventListener("touchmove", this.move, false);
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this.element.addEventListener("touchend", this.end, false);
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this.element.addEventListener("touchcancel", this.cancel, false);
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this.preV = { x: null, y: null };
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this.pinchStartLen = null;
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this.zoom = 1;
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this.isDoubleTap = false;
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var noop = function () { };
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this.rotate = wrapFunc(this.element, option.rotate || noop);
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this.touchStart = wrapFunc(this.element, option.touchStart || noop);
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this.multipointStart = wrapFunc(this.element, option.multipointStart || noop);
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this.multipointEnd = wrapFunc(this.element, option.multipointEnd || noop);
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this.pinch = wrapFunc(this.element, option.pinch || noop);
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this.swipe = wrapFunc(this.element, option.swipe || noop);
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this.tap = wrapFunc(this.element, option.tap || noop);
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this.doubleTap = wrapFunc(this.element, option.doubleTap || noop);
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this.longTap = wrapFunc(this.element, option.longTap || noop);
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this.singleTap = wrapFunc(this.element, option.singleTap || noop);
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this.pressMove = wrapFunc(this.element, option.pressMove || noop);
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this.touchMove = wrapFunc(this.element, option.touchMove || noop);
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this.touchEnd = wrapFunc(this.element, option.touchEnd || noop);
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this.touchCancel = wrapFunc(this.element, option.touchCancel || noop);
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this.delta = null;
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this.last = null;
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this.now = null;
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this.tapTimeout = null;
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this.singleTapTimeout = null;
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this.longTapTimeout = null;
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this.swipeTimeout = null;
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this.x1 = this.x2 = this.y1 = this.y2 = null;
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this.preTapPosition = { x: null, y: null };
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};
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AlloyFinger.prototype = {
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start: function (evt) {
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if (!evt.touches) return;
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this.now = Date.now();
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this.x1 = evt.touches[0].pageX;
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this.y1 = evt.touches[0].pageY;
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this.delta = this.now - (this.last || this.now);
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this.touchStart.dispatch(evt);
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if (this.preTapPosition.x !== null) {
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this.isDoubleTap = (this.delta > 0 && this.delta <= 250 && Math.abs(this.preTapPosition.x - this.x1) < 30 && Math.abs(this.preTapPosition.y - this.y1) < 30);
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}
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this.preTapPosition.x = this.x1;
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this.preTapPosition.y = this.y1;
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this.last = this.now;
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var preV = this.preV,
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len = evt.touches.length;
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if (len > 1) {
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this._cancelLongTap();
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this._cancelSingleTap();
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var v = { x: evt.touches[1].pageX - this.x1, y: evt.touches[1].pageY - this.y1 };
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preV.x = v.x;
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preV.y = v.y;
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this.pinchStartLen = getLen(preV);
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this.multipointStart.dispatch(evt);
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}
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this.longTapTimeout = setTimeout(function () {
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this.longTap.dispatch(evt);
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}.bind(this), 750);
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},
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move: function (evt) {
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if (!evt.touches) return;
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var preV = this.preV,
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len = evt.touches.length,
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currentX = evt.touches[0].pageX,
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currentY = evt.touches[0].pageY;
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this.isDoubleTap = false;
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if (len > 1) {
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var v = { x: evt.touches[1].pageX - currentX, y: evt.touches[1].pageY - currentY };
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if (preV.x !== null) {
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if (this.pinchStartLen > 0) {
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evt.zoom = getLen(v) / this.pinchStartLen;
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this.pinch.dispatch(evt);
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}
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evt.angle = getRotateAngle(v, preV);
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this.rotate.dispatch(evt);
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}
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preV.x = v.x;
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preV.y = v.y;
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} else {
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if (this.x2 !== null) {
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evt.deltaX = currentX - this.x2;
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evt.deltaY = currentY - this.y2;
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} else {
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evt.deltaX = 0;
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evt.deltaY = 0;
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}
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this.pressMove.dispatch(evt);
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}
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this.touchMove.dispatch(evt);
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this._cancelLongTap();
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this.x2 = currentX;
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this.y2 = currentY;
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if (len > 1) {
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evt.preventDefault();
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}
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},
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end: function (evt) {
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if (!evt.changedTouches) return;
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this._cancelLongTap();
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var self = this;
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if (evt.touches.length < 2) {
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this.multipointEnd.dispatch(evt);
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}
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//swipe
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if ((this.x2 && Math.abs(this.x1 - this.x2) > 30) ||
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(this.y2 && Math.abs(this.y1 - this.y2) > 30)) {
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evt.direction = this._swipeDirection(this.x1, this.x2, this.y1, this.y2);
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this.swipeTimeout = setTimeout(function () {
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self.swipe.dispatch(evt);
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}, 0)
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} else {
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this.tapTimeout = setTimeout(function () {
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self.tap.dispatch(evt);
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// trigger double tap immediately
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if (self.isDoubleTap) {
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self.doubleTap.dispatch(evt);
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clearTimeout(self.singleTapTimeout);
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self.isDoubleTap = false;
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}
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}, 0)
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if (!self.isDoubleTap) {
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self.singleTapTimeout = setTimeout(function () {
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self.singleTap.dispatch(evt);
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}, 250);
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}
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}
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this.touchEnd.dispatch(evt);
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this.preV.x = 0;
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this.preV.y = 0;
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this.zoom = 1;
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this.pinchStartLen = null;
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this.x1 = this.x2 = this.y1 = this.y2 = null;
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},
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cancel: function (evt) {
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clearTimeout(this.singleTapTimeout);
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clearTimeout(this.tapTimeout);
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clearTimeout(this.longTapTimeout);
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clearTimeout(this.swipeTimeout);
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this.touchCancel.dispatch(evt);
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},
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_cancelLongTap: function () {
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clearTimeout(this.longTapTimeout);
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},
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_cancelSingleTap: function () {
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clearTimeout(this.singleTapTimeout);
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},
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_swipeDirection: function (x1, x2, y1, y2) {
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return Math.abs(x1 - x2) >= Math.abs(y1 - y2) ? (x1 - x2 > 0 ? 'Left' : 'Right') : (y1 - y2 > 0 ? 'Up' : 'Down')
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},
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on: function(evt, handler) {
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if(this[evt]) {
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this[evt].add(handler);
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}
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},
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off: function(evt, handler) {
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if(this[evt]) {
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this[evt].del(handler);
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}
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},
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destroy: function() {
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if(this.singleTapTimeout) clearTimeout(this.singleTapTimeout);
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if(this.tapTimeout) clearTimeout(this.tapTimeout);
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if(this.longTapTimeout) clearTimeout(this.longTapTimeout);
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if(this.swipeTimeout) clearTimeout(this.swipeTimeout);
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this.element.removeEventListener("touchstart", this.start);
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this.element.removeEventListener("touchmove", this.move);
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this.element.removeEventListener("touchend", this.end);
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this.element.removeEventListener("touchcancel", this.cancel);
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this.rotate.del();
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this.touchStart.del();
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this.multipointStart.del();
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this.multipointEnd.del();
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this.pinch.del();
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this.swipe.del();
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this.tap.del();
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this.doubleTap.del();
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this.longTap.del();
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this.singleTap.del();
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this.pressMove.del();
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this.touchMove.del();
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this.touchEnd.del();
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this.touchCancel.del();
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this.preV = this.pinchStartLen = this.zoom = this.isDoubleTap = this.delta = this.last = this.now = this.tapTimeout = this.singleTapTimeout = this.longTapTimeout = this.swipeTimeout = this.x1 = this.x2 = this.y1 = this.y2 = this.preTapPosition = this.rotate = this.touchStart = this.multipointStart = this.multipointEnd = this.pinch = this.swipe = this.tap = this.doubleTap = this.longTap = this.singleTap = this.pressMove = this.touchMove = this.touchEnd = this.touchCancel = null;
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return null;
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}
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};
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if (typeof module !== 'undefined' && typeof exports === 'object') {
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module.exports = AlloyFinger;
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} else {
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window.AlloyFinger = AlloyFinger;
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}
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})();
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