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(function($, window, document) {
var STATE_BEFORECHANGEOFFSET = 'beforeChangeOffset';
var STATE_AFTERCHANGEOFFSET = 'afterChangeOffset';
var EVENT_PULLSTART = 'pullstart';
var EVENT_PULLING = 'pulling';
var EVENT_BEFORECHANGEOFFSET = STATE_BEFORECHANGEOFFSET;
var EVENT_AFTERCHANGEOFFSET = STATE_AFTERCHANGEOFFSET;
var EVENT_DRAGENDAFTERCHANGEOFFSET = 'dragEndAfterChangeOffset';
var CLASS_TRANSITIONING = $.className('transitioning');
var CLASS_PULL_TOP_TIPS = $.className('pull-top-tips');
var CLASS_PULL_BOTTOM_TIPS = $.className('pull-bottom-tips');
var CLASS_PULL_LOADING = $.className('pull-loading');
var CLASS_SCROLL = $.className('scroll');
var CLASS_PULL_TOP_ARROW = $.className('pull-loading') + ' ' + $.className('icon') + ' ' + $.className('icon-pulldown');
var CLASS_PULL_TOP_ARROW_REVERSE = CLASS_PULL_TOP_ARROW + ' ' + $.className('reverse');
var CLASS_PULL_TOP_SPINNER = $.className('pull-loading') + ' ' + $.className('spinner');
var CLASS_HIDDEN = $.className('hidden');
var SELECTOR_PULL_LOADING = '.' + CLASS_PULL_LOADING;
$.PullToRefresh = $.Class.extend({
init: function(element, options) {
this.element = element;
this.options = $.extend(true, {
down: {
height: 75,
callback: false,
},
up: {
auto: false,
offset: 100, //距离底部高度(到达该高度即触发)
show: true,
contentinit: '上拉显示更多',
contentdown: '上拉显示更多',
contentrefresh: '正在加载...',
contentnomore: '没有更多数据了',
callback: false
},
preventDefaultException: {
tagName: /^(INPUT|TEXTAREA|BUTTON|SELECT)$/
}
}, options);
this.stopped = this.isNeedRefresh = this.isDragging = false;
this.state = STATE_BEFORECHANGEOFFSET;
this.isInScroll = this.element.classList.contains(CLASS_SCROLL);
this.initPullUpTips();
this.initEvent();
},
_preventDefaultException: function(el, exceptions) {
for (var i in exceptions) {
if (exceptions[i].test(el[i])) {
return true;
}
}
return false;
},
initEvent: function() {
if ($.isFunction(this.options.down.callback)) {
this.element.addEventListener($.EVENT_START, this);
this.element.addEventListener('drag', this);
this.element.addEventListener('dragend', this);
}
if (this.pullUpTips) {
this.element.addEventListener('dragup', this);
if (this.isInScroll) {
this.element.addEventListener('scrollbottom', this);
} else {
window.addEventListener('scroll', this);
}
}
},
handleEvent: function(e) {
switch (e.type) {
case $.EVENT_START:
this.isInScroll && this._canPullDown() && e.target && !this._preventDefaultException(e.target, this.options.preventDefaultException) && e.preventDefault();
break;
case 'drag':
this._drag(e);
break;
case 'dragend':
this._dragend(e);
break;
case 'webkitTransitionEnd':
this._transitionEnd(e);
break;
case 'dragup':
case 'scroll':
this._dragup(e);
break;
case 'scrollbottom':
if (e.target === this.element) {
this.pullUpLoading(e);
}
break;
}
},
initPullDownTips: function() {
var self = this;
if ($.isFunction(self.options.down.callback)) {
self.pullDownTips = (function() {
var element = document.querySelector('.' + CLASS_PULL_TOP_TIPS);
if (element) {
element.parentNode.removeChild(element);
}
if (!element) {
element = document.createElement('div');
element.classList.add(CLASS_PULL_TOP_TIPS);
element.innerHTML = '<div class="mui-pull-top-wrapper"><span class="mui-pull-loading mui-icon mui-icon-pulldown"></span></div>';
element.addEventListener('webkitTransitionEnd', self);
}
self.pullDownTipsIcon = element.querySelector(SELECTOR_PULL_LOADING);
document.body.appendChild(element);
return element;
}());
}
},
initPullUpTips: function() {
var self = this;
if ($.isFunction(self.options.up.callback)) {
self.pullUpTips = (function() {
var element = self.element.querySelector('.' + CLASS_PULL_BOTTOM_TIPS);
if (!element) {
element = document.createElement('div');
element.classList.add(CLASS_PULL_BOTTOM_TIPS);
if (!self.options.up.show) {
element.classList.add(CLASS_HIDDEN);
}
element.innerHTML = '<div class="mui-pull-bottom-wrapper"><span class="mui-pull-loading">' + self.options.up.contentinit + '</span></div>';
self.element.appendChild(element);
}
self.pullUpTipsIcon = element.querySelector(SELECTOR_PULL_LOADING);
return element;
}());
}
},
_transitionEnd: function(e) {
if (e.target === this.pullDownTips && this.removing) {
this.removePullDownTips();
}
},
_dragup: function(e) {
var self = this;
if (self.loading) {
return;
}
if (e && e.detail && $.gestures.session.drag) {
self.isDraggingUp = true;
} else {
if (!self.isDraggingUp) { //scroll event
return;
}
}
if (!self.isDragging) {
if (self._canPullUp()) {
self.pullUpLoading(e);
}
}
},
_canPullUp: function() {
if (this.removing) {
return false;
}
if (this.isInScroll) {
var scrollId = this.element.parentNode.getAttribute('data-scroll');
if (scrollId) {
var scrollApi = $.data[scrollId];
return scrollApi.y === scrollApi.maxScrollY;
}
}
return window.pageYOffset + window.innerHeight + this.options.up.offset >= document.documentElement.scrollHeight;
},
_canPullDown: function() {
if (this.removing) {
return false;
}
if (this.isInScroll) {
var scrollId = this.element.parentNode.getAttribute('data-scroll');
if (scrollId) {
var scrollApi = $.data[scrollId];
return scrollApi.y === 0;
}
}
return document.body.scrollTop === 0;
},
_drag: function(e) {
if (this.loading || this.stopped) {
e.stopPropagation();
e.detail.gesture.preventDefault();
return;
}
var detail = e.detail;
if (!this.isDragging) {
if (detail.direction === 'down' && this._canPullDown()) {
if (document.querySelector('.' + CLASS_PULL_TOP_TIPS)) {
e.stopPropagation();
e.detail.gesture.preventDefault();
return;
}
this.isDragging = true;
this.removing = false;
this.startDeltaY = detail.deltaY;
$.gestures.session.lockDirection = true; //锁定方向
$.gestures.session.startDirection = detail.direction;
this._pullStart(this.startDeltaY);
}
}
if (this.isDragging) {
e.stopPropagation();
e.detail.gesture.preventDefault();
var deltaY = detail.deltaY - this.startDeltaY;
deltaY = Math.min(deltaY, 1.5 * this.options.down.height);
this.deltaY = deltaY;
this._pulling(deltaY);
var state = deltaY > this.options.down.height ? STATE_AFTERCHANGEOFFSET : STATE_BEFORECHANGEOFFSET;
if (this.state !== state) {
this.state = state;
if (this.state === STATE_AFTERCHANGEOFFSET) {
this.removing = false;
this.isNeedRefresh = true;
} else {
this.removing = true;
this.isNeedRefresh = false;
}
this['_' + state](deltaY);
}
if ($.os.ios && parseFloat($.os.version) >= 8) {
var clientY = detail.gesture.touches[0].clientY;
if ((clientY + 10) > window.innerHeight || clientY < 10) {
this._dragend(e);
return;
}
}
}
},
_dragend: function(e) {
var self = this;
if (self.isDragging) {
self.isDragging = false;
self._dragEndAfterChangeOffset(self.isNeedRefresh);
}
if (self.isPullingUp) {
if (self.pullingUpTimeout) {
clearTimeout(self.pullingUpTimeout);
}
self.pullingUpTimeout = setTimeout(function() {
self.isPullingUp = false;
}, 1000);
}
},
_pullStart: function(startDeltaY) {
this.pullStart(startDeltaY);
$.trigger(this.element, EVENT_PULLSTART, {
api: this,
startDeltaY: startDeltaY
});
},
_pulling: function(deltaY) {
this.pulling(deltaY);
$.trigger(this.element, EVENT_PULLING, {
api: this,
deltaY: deltaY
});
},
_beforeChangeOffset: function(deltaY) {
this.beforeChangeOffset(deltaY);
$.trigger(this.element, EVENT_BEFORECHANGEOFFSET, {
api: this,
deltaY: deltaY
});
},
_afterChangeOffset: function(deltaY) {
this.afterChangeOffset(deltaY);
$.trigger(this.element, EVENT_AFTERCHANGEOFFSET, {
api: this,
deltaY: deltaY
});
},
_dragEndAfterChangeOffset: function(isNeedRefresh) {
this.dragEndAfterChangeOffset(isNeedRefresh);
$.trigger(this.element, EVENT_DRAGENDAFTERCHANGEOFFSET, {
api: this,
isNeedRefresh: isNeedRefresh
});
},
removePullDownTips: function() {
if (this.pullDownTips) {
try {
this.pullDownTips.parentNode && this.pullDownTips.parentNode.removeChild(this.pullDownTips);
this.pullDownTips = null;
this.removing = false;
} catch (e) {}
}
},
pullStart: function(startDeltaY) {
this.initPullDownTips(startDeltaY);
},
pulling: function(deltaY) {
this.pullDownTips.style.webkitTransform = 'translate3d(0,' + deltaY + 'px,0)';
},
beforeChangeOffset: function(deltaY) {
this.pullDownTipsIcon.className = CLASS_PULL_TOP_ARROW;
},
afterChangeOffset: function(deltaY) {
this.pullDownTipsIcon.className = CLASS_PULL_TOP_ARROW_REVERSE;
},
dragEndAfterChangeOffset: function(isNeedRefresh) {
if (isNeedRefresh) {
this.pullDownTipsIcon.className = CLASS_PULL_TOP_SPINNER;
this.pullDownLoading();
} else {
this.pullDownTipsIcon.className = CLASS_PULL_TOP_ARROW;
this.endPullDownToRefresh();
}
},
pullDownLoading: function() {
if (this.loading) {
return;
}
if (!this.pullDownTips) {
this.initPullDownTips();
this.dragEndAfterChangeOffset(true);
return;
}
this.loading = true;
this.pullDownTips.classList.add(CLASS_TRANSITIONING);
this.pullDownTips.style.webkitTransform = 'translate3d(0,' + this.options.down.height + 'px,0)';
this.options.down.callback.apply(this);
},
pullUpLoading: function(e) {
if (this.loading || this.finished) {
return;
}
this.loading = true;
this.isDraggingUp = false;
this.pullUpTips.classList.remove(CLASS_HIDDEN);
e && e.detail && e.detail.gesture && e.detail.gesture.preventDefault();
this.pullUpTipsIcon.innerHTML = this.options.up.contentrefresh;
this.options.up.callback.apply(this);
},
endPullDownToRefresh: function() {
this.loading = false;
this.pullUpTips && this.pullUpTips.classList.remove(CLASS_HIDDEN);
this.pullDownTips.classList.add(CLASS_TRANSITIONING);
this.pullDownTips.style.webkitTransform = 'translate3d(0,0,0)';
if (this.deltaY <= 0) {
this.removePullDownTips();
} else {
this.removing = true;
}
if (this.isInScroll) {
$(this.element.parentNode).scroll().refresh();
}
},
endPullUpToRefresh: function(finished) {
if (finished) {
this.finished = true;
this.pullUpTipsIcon.innerHTML = this.options.up.contentnomore;
this.element.removeEventListener('dragup', this);
window.removeEventListener('scroll', this);
} else {
this.pullUpTipsIcon.innerHTML = this.options.up.contentdown;
}
this.loading = false;
if (this.isInScroll) {
$(this.element.parentNode).scroll().refresh();
}
},
setStopped: function(stopped) {
if (stopped != this.stopped) {
this.stopped = stopped;
this.pullUpTips && this.pullUpTips.classList[stopped ? 'add' : 'remove'](CLASS_HIDDEN);
}
},
refresh: function(isReset) {
if (isReset && this.finished && this.pullUpTipsIcon) {
this.pullUpTipsIcon.innerHTML = this.options.up.contentdown;
this.element.addEventListener('dragup', this);
window.addEventListener('scroll', this);
this.finished = false;
}
}
});
$.fn.pullToRefresh = function(options) {
var pullRefreshApis = [];
options = options || {};
this.each(function() {
var self = this;
var pullRefreshApi = null;
var id = self.getAttribute('data-pullToRefresh');
if (!id) {
id = ++$.uuid;
$.data[id] = pullRefreshApi = new $.PullToRefresh(self, options);
self.setAttribute('data-pullToRefresh', id);
} else {
pullRefreshApi = $.data[id];
}
if (options.up && options.up.auto) { //如果设置了auto，则自动上拉一次
pullRefreshApi.pullUpLoading();
}
pullRefreshApis.push(pullRefreshApi);
});
return pullRefreshApis.length === 1 ? pullRefreshApis[0] : pullRefreshApis;
}
})(mui, window, document);
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