controllets/treeview-controllet/treeview-controllet.html

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

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

    Permission is hereby granted, free of charge, to any person obtaining a copy
    of this software and associated documentation files (the "Software"), to deal
    in the Software without restriction, including without limitation the rights
    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
    copies of the Software, and to permit persons to whom the Software is
    furnished to do so, subject to the following conditions:

    The above copyright notice and this permission notice shall be included in
    all copies or substantial portions of the Software.

    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    THE SOFTWARE.
-->

<!--
* 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>