/*!
* Nestable jQuery Plugin - Copyright (c) 2012 David Bushell - http://dbushell.com/
* Dual-licensed under the BSD or MIT licenses
*/
;(function($, window, document, undefined)
{
var hasTouch = 'ontouchstart' in window;
/**
* Detect CSS pointer-events property
* events are normally disabled on the dragging element to avoid conflicts
* https://github.com/ausi/Feature-detection-technique-for-pointer-events/blob/master/modernizr-pointerevents.js
*/
var hasPointerEvents = (function()
{
var el = document.createElement('div'),
docEl = document.documentElement;
if (!('pointerEvents' in el.style)) {
return false;
}
el.style.pointerEvents = 'auto';
el.style.pointerEvents = 'x';
docEl.appendChild(el);
var supports = window.getComputedStyle && window.getComputedStyle(el, '').pointerEvents === 'auto';
docEl.removeChild(el);
return !!supports;
})();
var eStart = hasTouch ? 'touchstart' : 'mousedown',
eMove = hasTouch ? 'touchmove' : 'mousemove',
eEnd = hasTouch ? 'touchend' : 'mouseup';
eCancel = hasTouch ? 'touchcancel' : 'mouseup';
var defaults = {
listNodeName : 'ol',
itemNodeName : 'li',
rootClass : 'dd',
listClass : 'dd-list',
itemClass : 'dd-item',
dragClass : 'dd-dragel',
handleClass : 'dd-handle',
collapsedClass : 'dd-collapsed',
placeClass : 'dd-placeholder',
noDragClass : 'dd-nodrag',
emptyClass : 'dd-empty',
expandBtnHTML : '<button data-action="expand" type="button">Expand</button>',
collapseBtnHTML : '<button data-action="collapse" type="button">Collapse</button>',
group : 0,
maxDepth : 5,
threshold : 20
};
function Plugin(element, options)
{
this.w = $(window);
this.el = $(element);
this.options = $.extend({}, defaults, options);
this.init();
}
Plugin.prototype = {
init: function()
{
var list = this;
list.reset();
list.el.data('nestable-group', this.options.group);
list.placeEl = $('<div class="' + list.options.placeClass + '"/>');
$.each(this.el.find(list.options.itemNodeName), function(k, el) {
list.setParent($(el));
});
list.el.on('click', 'button', function(e) {
if (list.dragEl || (!hasTouch && e.button !== 0)) {
return;
}
var target = $(e.currentTarget),
action = target.data('action'),
item = target.parent(list.options.itemNodeName);
if (action === 'collapse') {
list.collapseItem(item);
}
if (action === 'expand') {
list.expandItem(item);
}
});
var onStartEvent = function(e)
{
var handle = $(e.target);
if (!handle.hasClass(list.options.handleClass)) {
if (handle.closest('.' + list.options.noDragClass).length) {
return;
}
handle = handle.closest('.' + list.options.handleClass);
}
if (!handle.length || list.dragEl || (!hasTouch && e.button !== 0) || (hasTouch && e.touches.length !== 1)) {
return;
}
e.preventDefault();
list.dragStart(hasTouch ? e.touches[0] : e);
};
var onMoveEvent = function(e)
{
if (list.dragEl) {
e.preventDefault();
list.dragMove(hasTouch ? e.touches[0] : e);
}
};
var onEndEvent = function(e)
{
if (list.dragEl) {
e.preventDefault();
list.dragStop(hasTouch ? e.touches[0] : e);
}
};
if (hasTouch) {
list.el[0].addEventListener(eStart, onStartEvent, false);
window.addEventListener(eMove, onMoveEvent, false);
window.addEventListener(eEnd, onEndEvent, false);
window.addEventListener(eCancel, onEndEvent, false);
} else {
list.el.on(eStart, onStartEvent);
list.w.on(eMove, onMoveEvent);
list.w.on(eEnd, onEndEvent);
}
},
serialize: function()
{
var data,
depth = 0,
list = this;
step = function(level, depth)
{
var array = [ ],
items = level.children(list.options.itemNodeName);
items.each(function()
{
var li = $(this),
item = $.extend({}, li.data()),
sub = li.children(list.options.listNodeName);
if (sub.length) {
item.children = step(sub, depth + 1);
}
array.push(item);
});
return array;
};
data = step(list.el.find(list.options.listNodeName).first(), depth);
return data;
},
serialise: function()
{
return this.serialize();
},
reset: function()
{
this.mouse = {
offsetX : 0,
offsetY : 0,
startX : 0,
startY : 0,
lastX : 0,
lastY : 0,
nowX : 0,
nowY : 0,
distX : 0,
distY : 0,
dirAx : 0,
dirX : 0,
dirY : 0,
lastDirX : 0,
lastDirY : 0,
distAxX : 0,
distAxY : 0
};
this.moving = false;
this.dragEl = null;
this.dragRootEl = null;
this.dragDepth = 0;
this.hasNewRoot = false;
this.pointEl = null;
},
expandItem: function(li)
{
li.removeClass(this.options.collapsedClass);
li.children('[data-action="expand"]').hide();
li.children('[data-action="collapse"]').show();
li.children(this.options.listNodeName).show();
},
collapseItem: function(li)
{
var lists = li.children(this.options.listNodeName);
if (lists.length) {
li.addClass(this.options.collapsedClass);
li.children('[data-action="collapse"]').hide();
li.children('[data-action="expand"]').show();
li.children(this.options.listNodeName).hide();
}
},
expandAll: function()
{
var list = this;
list.el.find(list.options.itemNodeName).each(function() {
list.expandItem($(this));
});
},
collapseAll: function()
{
var list = this;
list.el.find(list.options.itemNodeName).each(function() {
list.collapseItem($(this));
});
},
setParent: function(li)
{
if (li.children(this.options.listNodeName).length) {
li.prepend($(this.options.expandBtnHTML));
li.prepend($(this.options.collapseBtnHTML));
}
li.children('[data-action="expand"]').hide();
},
unsetParent: function(li)
{
li.removeClass(this.options.collapsedClass);
li.children('[data-action]').remove();
li.children(this.options.listNodeName).remove();
},
dragStart: function(e)
{
var mouse = this.mouse,
target = $(e.target),
dragItem = target.closest(this.options.itemNodeName);
this.placeEl.css('height', dragItem.height());
mouse.offsetX = e.offsetX !== undefined ? e.offsetX : e.pageX - target.offset().left;
mouse.offsetY = e.offsetY !== undefined ? e.offsetY : e.pageY - target.offset().top;
mouse.startX = mouse.lastX = e.pageX;
mouse.startY = mouse.lastY = e.pageY;
this.dragRootEl = this.el;
this.dragEl = $(document.createElement(this.options.listNodeName)).addClass(this.options.listClass + ' ' + this.options.dragClass);
this.dragEl.css('width', dragItem.width());
// fix for zepto.js
//dragItem.after(this.placeEl).detach().appendTo(this.dragEl);
dragItem.after(this.placeEl);
dragItem[0].parentNode.removeChild(dragItem[0]);
dragItem.appendTo(this.dragEl);
$(document.body).append(this.dragEl);
this.dragEl.css({
'left' : e.pageX - mouse.offsetX,
'top' : e.pageY - mouse.offsetY
});
// total depth of dragging item
var i, depth,
items = this.dragEl.find(this.options.itemNodeName);
for (i = 0; i < items.length; i++) {
depth = $(items[i]).parents(this.options.listNodeName).length;
if (depth > this.dragDepth) {
this.dragDepth = depth;
}
}
},
dragStop: function(e)
{
// fix for zepto.js
//this.placeEl.replaceWith(this.dragEl.children(this.options.itemNodeName + ':first').detach());
var el = this.dragEl.children(this.options.itemNodeName).first();
el[0].parentNode.removeChild(el[0]);
this.placeEl.replaceWith(el);
this.dragEl.remove();
this.el.trigger('change');
if (this.hasNewRoot) {
this.dragRootEl.trigger('change');
}
this.reset();
},
dragMove: function(e)
{
var list, parent, prev, next, depth,
opt = this.options,
mouse = this.mouse;
this.dragEl.css({
'left' : e.pageX - mouse.offsetX,
'top' : e.pageY - mouse.offsetY
});
// mouse position last events
mouse.lastX = mouse.nowX;
mouse.lastY = mouse.nowY;
// mouse position this events
mouse.nowX = e.pageX;
mouse.nowY = e.pageY;
// distance mouse moved between events
mouse.distX = mouse.nowX - mouse.lastX;
mouse.distY = mouse.nowY - mouse.lastY;
// direction mouse was moving
mouse.lastDirX = mouse.dirX;
mouse.lastDirY = mouse.dirY;
// direction mouse is now moving (on both axis)
mouse.dirX = mouse.distX === 0 ? 0 : mouse.distX > 0 ? 1 : -1;
mouse.dirY = mouse.distY === 0 ? 0 : mouse.distY > 0 ? 1 : -1;
// axis mouse is now moving on
var newAx = Math.abs(mouse.distX) > Math.abs(mouse.distY) ? 1 : 0;
// do nothing on first move
if (!mouse.moving) {
mouse.dirAx = newAx;
mouse.moving = true;
return;
}
// calc distance moved on this axis (and direction)
if (mouse.dirAx !== newAx) {
mouse.distAxX = 0;
mouse.distAxY = 0;
} else {
mouse.distAxX += Math.abs(mouse.distX);
if (mouse.dirX !== 0 && mouse.dirX !== mouse.lastDirX) {
mouse.distAxX = 0;
}
mouse.distAxY += Math.abs(mouse.distY);
if (mouse.dirY !== 0 && mouse.dirY !== mouse.lastDirY) {
mouse.distAxY = 0;
}
}
mouse.dirAx = newAx;
/**
* move horizontal
*/
if (mouse.dirAx && mouse.distAxX >= opt.threshold) {
// reset move distance on x-axis for new phase
mouse.distAxX = 0;
prev = this.placeEl.prev(opt.itemNodeName);
// increase horizontal level if previous sibling exists and is not collapsed
if (mouse.distX > 0 && prev.length && !prev.hasClass(opt.collapsedClass)) {
// cannot increase level when item above is collapsed
list = prev.find(opt.listNodeName).last();
// check if depth limit has reached
depth = this.placeEl.parents(opt.listNodeName).length;
if (depth + this.dragDepth <= opt.maxDepth) {
// create new sub-level if one doesn't exist
if (!list.length) {
list = $('<' + opt.listNodeName + '/>').addClass(opt.listClass);
list.append(this.placeEl);
prev.append(list);
this.setParent(prev);
} else {
// else append to next level up
list = prev.children(opt.listNodeName).last();
list.append(this.placeEl);
}
}
}
// decrease horizontal level
if (mouse.distX < 0) {
// we can't decrease a level if an item preceeds the current one
next = this.placeEl.next(opt.itemNodeName);
if (!next.length) {
parent = this.placeEl.parent();
this.placeEl.closest(opt.itemNodeName).after(this.placeEl);
if (!parent.children().length) {
this.unsetParent(parent.parent());
}
}
}
}
var isEmpty = false;
// find list item under cursor
if (!hasPointerEvents) {
this.dragEl[0].style.visibility = 'hidden';
}
this.pointEl = $(document.elementFromPoint(e.pageX - document.body.scrollLeft, e.pageY - (window.pageYOffset || document.documentElement.scrollTop)));
if (!hasPointerEvents) {
this.dragEl[0].style.visibility = 'visible';
}
if (this.pointEl.hasClass(opt.handleClass)) {
this.pointEl = this.pointEl.parent(opt.itemNodeName);
}
if (this.pointEl.hasClass(opt.emptyClass)) {
isEmpty = true;
}
else if (!this.pointEl.length || !this.pointEl.hasClass(opt.itemClass)) {
return;
}
// find parent list of item under cursor
var pointElRoot = this.pointEl.closest('.' + opt.rootClass),
isNewRoot = this.dragRootEl.data('nestable-id') !== pointElRoot.data('nestable-id');
/**
* move vertical
*/
if (!mouse.dirAx || isNewRoot || isEmpty) {
// check if groups match if dragging over new root
if (isNewRoot && opt.group !== pointElRoot.data('nestable-group')) {
return;
}
// check depth limit
depth = this.dragDepth - 1 + this.pointEl.parents(opt.listNodeName).length;
if (depth > opt.maxDepth) {
return;
}
var before = e.pageY < (this.pointEl.offset().top + this.pointEl.height() / 2);
parent = this.placeEl.parent();
// if empty create new list to replace empty placeholder
if (isEmpty) {
list = $(document.createElement(opt.listNodeName)).addClass(opt.listClass);
list.append(this.placeEl);
this.pointEl.replaceWith(list);
}
else if (before) {
this.pointEl.before(this.placeEl);
}
else {
this.pointEl.after(this.placeEl);
}
if (!parent.children().length) {
this.unsetParent(parent.parent());
}
if (!this.dragRootEl.find(opt.itemNodeName).length) {
this.dragRootEl.append('<div class="' + opt.emptyClass + '"/>');
}
// parent root list has changed
if (isNewRoot) {
this.dragRootEl = pointElRoot;
this.hasNewRoot = this.el[0] !== this.dragRootEl[0];
}
}
}
};
$.fn.nestable = function(params)
{
var lists = this,
retval = this;
lists.each(function()
{
var plugin = $(this).data("nestable");
if (!plugin) {
$(this).data("nestable", new Plugin(this, params));
$(this).data("nestable-id", new Date().getTime());
} else {
if (typeof params === 'string' && typeof plugin[params] === 'function') {
retval = plugin[params]();
}
}
});
return retval || lists;
};
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