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