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zepto.sortable.js
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zepto.sortable.js
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/**
* Zepto sortable 0.2
* Copyright 2016, https://github.com/fwon
* Dual licensed under the MIT or GPL Version 2 licenses.
*
* Desctiption:
* Avaliable for both pc and mobile
* Depends:
* zepto.js
*/
(function($) {
var bindedElement = []; //if element has binded or not
$.fn.sortable = function(options) {
//had add listener, then return
if (bindedElement.indexOf(this.selector) < 0) {
bindedElement.push(this.selector)
} else {
return false;
}
var defaults = {
orient: null, //orient of items vertical/horizontal
itemClassName: 'cont', //item className
positionDisplay: 'static',
afterSort: null
};
options = $.extend(defaults, options);
//orient is required
if (!options.orient) return;
var itemPositions = [], //the position of all items
itemElements, //element of all items
itemClassName = options.itemClassName,
selector = this.selector,
itemSelectorSelf = '.' + itemClassName,
itemSelector = selector + ' .' + itemClassName,
offsetLeft, //left of first item
offsetTop, //top of first item
itemDistanceX = null,
itemDistanceY = null, //distance of each item
isVertical = (options.orient === 'vertical');
function _initDistance() {
if ($(itemSelector).length < 2) return false;
var firstElement = $(itemSelector).first();
var secondElement = $($(itemSelector).get(1));
if (firstElement && secondElement) {
offsetTop = firstElement.position().top;
itemDistanceY = secondElement.position().top - offsetTop;
offsetLeft = firstElement.position().left;
itemDistanceX = secondElement.position().left - offsetLeft;
return true;
} else {
return false;
}
}
//collect absolute position of all items
function _collectPositions() {
itemElements = $(itemSelector);
itemPositions = [];
for (var i = 0, len = itemElements.length; i < len; i++) {
var item = $(itemElements[i]);
var _left = item.position().left,
_top = item.position().top;
itemPositions.push({
left: _left,
top: _top
});
//add class cont-n & data-pos
item.addClass(itemClassName + '-' + i);
item.attr('data-pos', i);
}
}
//change items to absolute position
function _setEleAbsolute() {
itemElements = $(itemSelector);
for (var i = 0, len = itemElements.length; i < len; i++) {
var item = $(itemElements[i]);
var pos = itemPositions[i];
item.css({
position: 'absolute',
left: pos.left,
top: pos.top
});
}
}
//change items to static position
function _setEleStatic() {
$(itemSelector).css({
position: options.positionDisplay,
left: '',
top: ''
});
}
/**
* exchange position of two item, to their father container
* @param {[DOM]} target [dragging element]
* @param {[DOM]} origin [element to replace]
*/
function _exchangeItems(target, origin) {
var targetPos = target.data('pos'),
originPos = origin.data('pos');
target.data('pos', originPos);
origin.data('pos', targetPos);
target.removeClass(itemClassName + '-' + targetPos)
.addClass(itemClassName + '-' + originPos);
origin.removeClass(itemClassName + '-' + originPos)
.addClass(itemClassName + '-' + targetPos);
if (+targetPos > +originPos) {
origin.insertAfter(target);
} else {
origin.insertBefore(target);
}
}
//collect items position first
//_collectPositions();
var targetItem, oldPos, curPos;
$(selector).on('touchstart mousedown', itemSelectorSelf, function(e) {
e.preventDefault();
e.stopPropagation();
if (!_initDistance()) return false;
_collectPositions();
targetItem = $(e.currentTarget);
oldPos = +targetItem.data('pos');
_setEleAbsolute();
});
$(selector).on('touchmove mousemove', itemSelectorSelf, function(e) {
e.preventDefault();
e.stopPropagation();
//move event must after start/down
if (!targetItem) return false;
var touch = null;
if (e.type === 'touchmove') {
if (e.touches && e.touches.length === 1) {
touch = e.touches[0];
}
} else if (e.type === 'mousemove') {
touch = {
pageX: e.pageX,
pageY: e.pageY
};
}
if (!touch) return false;
if (isVertical) {
targetItem.css({
top: touch.pageY - itemDistanceY/2
});
} else {
targetItem.css({
left: touch.pageX - itemDistanceX/2
});
}
if (isVertical) {
curPos = Math.floor((touch.pageY - offsetTop)/itemDistanceY);
} else {
curPos = Math.floor((touch.pageX - offsetLeft)/itemDistanceX);
}
if (curPos < 0) curPos = 0;
if (curPos >= itemElements.length) curPos = itemElements.length - 1;
if (oldPos !== curPos) {
var originItem = $(itemSelector + '-' + curPos);
originItem.css({
left: itemPositions[oldPos]['left'],
top: itemPositions[oldPos]['top']
});
_exchangeItems(targetItem, originItem);
oldPos = curPos;
}
});
$(selector).on('touchend mouseup', itemSelectorSelf, function(e) {
//not move! just click
//curPos == 0 is ok
if (!(curPos+1)) {
targetItem = null;
return false;
}
targetItem.css({
left: itemPositions[curPos]['left'],
top: itemPositions[curPos]['top']
});
targetItem = null;
_setEleStatic();
//after sorted callback
if (options.afterSort) {
options.afterSort();
}
});
}
})(Zepto);