SGH / COMPONENTS

<!--
@license
    The MIT License (MIT)

    Copyright (c) 2015 Dipartimento di Informatica - Università di Salerno - Italy

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    of this software and associated documentation files (the "Software"), to deal
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    The above copyright notice and this permission notice shall be included in
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    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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<!--
* Developed by :
* ROUTE-TO-PA Project - grant No 645860. - www.routetopa.eu
*
-->

<link rel="import" href="../../bower_components/polymer/polymer.html">
<link rel="import" href="../../bower_components/paper-styles/color.html">
<link rel="import" href="../../bower_components/paper-checkbox/paper-checkbox.html">

<!--
 `treeview-controllet` build a treeview from an input object. Each leaf fields of the object has a material design checkbox. When the user select a field
  an event will broadcast in order to make the component that use the treeview to get the current selected filed.
  After insert the `treeview-controllet` in the DOM you have to initialize it with the object you want put in the tree because of to make this component able
  to work with async object request.

Example:

    <treeview-controllet id="treeviewID"></treeview-controllet>

    in the javascript code:

       this.$.treeviewID.init(object);

@element items-slider-controllet
@status beta
@homepage index.html
@group controllets
-->

<dom-module id="treeview-controllet">
    <template>

        <style is="custom-style">

            ::content .list {
                margin: .5rem;
                display: block;
                list-style-type: none;
            }

            ::content li.list__item{
                position: relative;
                float: left;
                width: 100%;
            }

            ::content ul.list{
                position: relative;
                float : left   ;
                width: 100%;
            }

            ::content .list__item {
                margin: 0 0 .5rem 0;
                padding: 0;
            }

            ::content main   { font-size:16px; }
            ::content .stuff { padding-top:60px; }

            /* basic css */
            ::content input[type=checkbox]   { display:none; position:absolute; left:0;}
            ::content label, p               { padding-left:10px; }
            ::content .check-awesome         { position:relative; float:left; }

            /* checkbox css */
            ::content label                  { cursor:pointer; }
            ::content label span             { display:block; position:absolute; left:0;
                -webkit-transition-duration:0.3s; -moz-transition-duration:0.3s; transition-duration:0.3s;
            }
            ::content label .circle          {
                background:#FFF;
                left:-30px;
                top:-30px;
                height:80px;
                width:80px;
                z-index:-1;
                border-radius:50%; -moz-border-radius:50%; -webkit-border-radius:50%;
            }
            ::content label .box     {
                border:2px solid #DDDDDD;
                height:16px;
                width:16px;
                z-index:888;
                -webkit-transition-delay:0.1s; -moz-transition-delay:0.1s; transition-delay:0.1s;
                position: relative;
                float: left;
            }
            ::content label .check         {
                top: -7px;
                left: 6px;
                width: 11px;
                height: 16px;
                border:2px solid #2196f3;
                border-top: none;
                border-left: none;
                opacity:0;
                z-index:888;
                -webkit-transform:rotate(180deg); -moz-transform:rotate(180deg); transform:rotate(180deg);
                -webkit-transition-delay:0.1s; -moz-transition-delay:0.1s; transition-delay:0.1s;
            }

            /* handling click events */

            /* when checkbox is checked */
            ::content label .circle {
                -webkit-animation   :growCircle 0.3s ease;
                -moz-animation      :growCircle 0.3s ease;
                animation           :growCircle 0.3s ease;
            }
            ::content input[type=checkbox]:checked ~ label .box {
                opacity:0;
                -webkit-transform   :scale(0) rotate(-180deg);
                -moz-transform        :scale(0) rotate(-180deg);
                transform                 :scale(0) rotate(-180deg);
            }
            ::content input[type=checkbox]:checked ~ label .check {
                opacity:1;
                -webkit-transform   :scale(1) rotate(45deg);
                -moz-transform      :scale(1) rotate(45deg);
                transform           :scale(1) rotate(45deg);
            }

            /* bubble animation */

            ::content @-webkit-keyframes growCircle {
                0%, 100%   { -webkit-transform:scale(0); }
                70%        { background:#DDD; -webkit-transform:scale(1.25); }
            }
            ::content @-moz-keyframes growCircle {
                0%, 100%   { -moz-transform:scale(0); }
                70%        { background:#DDD; -moz-transform:scale(1.25); }
            }
            ::content @keyframes growCircle {
                0%, 100%   { transform:scale(0); }
                70%        { background:#DDD; transform:scale(1.25); }
            }

            ::content .select-all{
               /* position:relative;
                float:left;
                left: 20px;*/
            }

            ::content div.hiding_panel{
                width: 100%;
                height: 15px;
                margin-bottom: 18px;
                /*padding: 3px;
                height: 35px;
                border: 1px;
                background: #fff;
                border-radius: 0.125rem;
                box-shadow: 0 0.125rem 0.3125rem 0 rgba(0, 0, 0, 0.25);*/
            }

            ::content div.panel-title{
                position: relative;
                float: left;
                padding-left: 10px;
                padding-right: 10px;
                font-weight: bolder;
                color: #000000;
            }

            ::content iron-icon.panel-hide-trigger {
                position: relative;
                float: left;
                height: 24px;
                width: 24px;
                border-radius: 50%;
                /*background: var(--paper-pink-500);*/
                background: #348ED5;
                color: white;
                line-height: 64px;
            }

            ::content iron-icon.panel-hide-trigger:hover {
                /*color: var(--google-gray-700);*/
                color : #000000;
            }

            ::content .items-list{
                display: none;
            }

        </style>



        <div class="vertical-section">
            <div id="treeview_placeholder" class="horizontal-section"></div>
        </div>

    </template>

    <script>

        Polymer({

            is : 'treeview-controllet',

            /**
             * Fired when the user check a checkbox
             *
             * @event treeview-controllet_fileds-selected
             * */

            listeners : {
                'tap' : '_clickHandler'
            },

            properties : {
                /**
                 * It stores the fields structure of the tree
                 *
                 */
                fieldsMap : {
                    type : Map,
                    value : null
                },
                /**
                 * Array of pre-selected fields. it's used to open the treeview with pre-selected checkbox checked
                 */
                selectedFields:{
                   type: Array,
                   value: undefined
                }

            },
            /**
             * Create the container for all leaf node fields when a field has a children set.
             *
             */
            createFieldsContainer : function(id, heading){

                var ul = document.createElement('ul');
                ul.className     = "list";
                ul.id                  = id;
                ul.innerHTML           = '<div class="hiding_panel">' +
                                            '<iron-icon icon="chevron-right" class="panel-hide-trigger"></iron-icon>' +
                                            '<div class="panel-title">' + heading + '</div>' +
                                            /*'<input id="'+ heading +'" type="checkbox" class="checkbox select-all" style="display:block;">' +*/
                                            /*'<div class="check-awesome">' +
                                                '<input class="checkbox select-all" type="checkbox" id="'+ heading + '">' +
                                                    '<label for="'+ heading + '"class="label">' +
                                                    '<span></span>' +
                                                    '<span class="check"></span>' +
                                                    '<span class="box"></span>'+
                                                '</label>' +
                                            '</div>' +*/
                                         '</div>';
                                         /*'<div class="items-list"></div>';*/
                ul.innerHTML += (id.indexOf("records") != -1)  ?  '<div class="items-list" style="display:block;"></div>' : '<div class="items-list"></div>';

                return ul;

            },
            /**
             * check if fields is in preselection list
             */
            checkIsFieldsIsSelected : function(field){
                if(this.selectedFields == undefined) return false;
                for(var i = 0; i < this.selectedFields.length; i++)
                    if(field.replace("root,","") == this.selectedFields[i]) return true;
                return false;
            },
            /**
             * Create the checkbox for current leaf node field.
             *
             */
            createListItem : function(id, label) {

               return '<li class="list__item">' +
                         '<div class="check-awesome">' +
                            '<input class="checkbox" type="checkbox" id="'+ id + '"' + ((this.checkIsFieldsIsSelected(id)) ? 'checked' : '')  + '>' +
                            '<label for="'+ id + '" style="padding-left:10px;">' +
                                '<span></span>' +
                                '<span class="check"></span>' +
                                '<span class="box"></span>' +
                                   label +
                            '</label>' +
                         '</div>' +
                      '</li>';
            },
            /**
             * Recursively analyze the input object and build the treeview
             *
             */
            analyzeObject : function(parent_list, curr_field, object) {
                if(object == null) return;
                if(curr_field != null){
                    if(object == null) object = "";

                    var curr_map_parent_list = parent_list.slice();
                    curr_map_parent_list.splice(-1);
                    if(object.constructor == Array){//Deal with flat array case
                        if(object[0].constructor != Object){
                            //MATERIAL CHECKBOX UL
                            this.fieldsMap[curr_map_parent_list.toString()].children[1].innerHTML += this.createListItem(parent_list.toString(), curr_field);
                            return;
                        }
                    }
                    if(object.constructor == Array || object.constructor == Object){
                        var panel = this.createFieldsContainer(curr_field, parent_list[parent_list.length - 1]);
                        this.fieldsMap[/*curr_field*/parent_list.toString()] = panel;
                        //MATERIAL CHECKBOX UL
                        this.fieldsMap[curr_map_parent_list.toString()].appendChild(this.fieldsMap[parent_list.toString()]);
                    }else{
                        //MATERIAL CHECKBOX UL
                        this.fieldsMap[curr_map_parent_list.toString()].children[1].innerHTML += this.createListItem(parent_list.toString(), curr_field);
                    }
                }
                if(object.constructor == Array || object.constructor == Object) {
                    var obj = (object.constructor == Array) ? object[0] : object;
                    if(Object.prototype.toString.call(obj) === '[object String]') return;//Deal with flat array case
                    for (var field in obj) {
                        var parents = new Array();
                        parent_list.every(function (element, index, array) {
                            parents.push(element);
                            return true;
                        });
                        parents.push(field);
                        this.analyzeObject(parents, field, obj[field]);
                    }
                }
            },
            /**
             * Initialize treeview with the object you want put in the tree because of to make this component able
             * to work with async object request.
             *
             */
            init : function(data, preselection){
                this.selectedFields = preselection;
                //crete root node and insert it in to shadow dom
                var mainPanel = this.createFieldsContainer("root", "Data fields");
                //MATERIAL CHECKBOX UL
                mainPanel.children[1].style.display = "block";

                this.$.treeview_placeholder.innerHTML = "";
                this.$.treeview_placeholder.appendChild(mainPanel);
                this.fieldsMap = new Map;
                this.fieldsMap["root"] = mainPanel;
                //call recursive analyze function for current json to get all fields user can select
                this.analyzeObject(new Array("root"), null, data);

                if(this.selectedFields != undefined) this.fireSelectedFields();

            },
            /**
             * When a user click on a checkbox it retrieves all checked fields and fire an event with this information.
             *
             */
            fireSelectedFields : function(){

                var cbs = Polymer.dom(this.$.treeview_placeholder).querySelectorAll('input[type=checkbox]:checked');
                var fields = Array();
                for(var i=0;i<cbs.length;i++) {
                    if(cbs[i].className.includes("select-all")) continue;
                    fields.push(cbs[i].id.replace("root,",""));
                }

                this.fire('treeview-controllet_fileds-selected', {fields : fields});
            },

            _clickHandler : function(e){
                if(Object.getPrototypeOf(e) !== CustomEvent.prototype) {
                    e = e[Object.keys(e)[0]];
                }

                if(!e.target.control) {
                    switch((e.target.className.indexOf("iron-icon") != -1) ? "panel-hide-trigger" : e.target.className){
                        case 'box':

                            /*var el = e.target.previousSibling.previousSibling;
                            el.classList = 'circle';
                            var newone = el.clone(true);
                            el.before(newone);
                            $("." + el.attr("class") + ":last").remove();*/

                            break;
                        case 'checkbox':
                            this.fireSelectedFields();

                            break;
                        case 'panel-hide-trigger':

                            if(e.target.parentNode.parentNode.children[1].style.display == "block") {
                                e.target.parentNode.parentNode.children[1].style.cssText = "display: none;";
                                e.target.icon = "chevron-right";

                            }else{
                                e.target.parentNode.parentNode.children[1].style.cssText = "display: block;";
                                e.target.icon = "expand-more";
                            }
                            break;
                        case 'checkbox select-all':
                                var childs = e.srcElement.parentNode.parentNode.children[1].childNodes;
                                for(var i=0; i < childs.length; i++){
                                    childs[i].children[0].checked = e.srcElement.checked;
                                }

                                this.fireSelectedFields();

                            break;
                    }
                }
            }
        });

    </script>

</dom-module>