controllets/items-slider-controllet/items-slider-controllet.html

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<link rel="import" href="../../bower_components/paper-styles/color.html">
<!--<link rel="import" href="../../bower_components/paper-styles/demo.css">-->

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<link rel="import" href="../../bower_components/neon-animation/neon-animatable.html">
<link rel="import" href="../../bower_components/neon-animation/neon-animations.html">

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<dom-module id="items-slider-controllet">
    <template>

        <style is="custom-style">
           /* body {
                margin: 0;
                padding: 3em;
                -webkit-tap-highlight-color: rgba(0,0,0,0);
                -webkit-touch-callout: none;
                line-height: 0;
                font-size: 1vw;
            }*/


            ::content .content-card{
                position: relative;
                float: left;
                margin : .5em;
               /* height: 8em;
                width: 7em;
                min-width: 80px;
                max-width: 115px;*/
                width: 16%;
                height: 70%;
                background: #fff;
                -moz-border-radius: 0.125rem;; /* Firefox */
                -webkit-border-radius: 0.125rem;; /* Safari, Chrome */
                border-radius: 0.125rem;
                box-shadow:         0 0.625em 0.5125em 0 rgba(0, 0, 0, 0.25);
                -webkit-box-shadow: 0 0.625em 0.5125em 0 rgba(0, 0, 0, 0.25);
                -moz-box-shadow:    0 0.625em 0.5125em 0 rgba(0, 0, 0, 0.25);
                padding: 1em;
            }

            ::content .content-selected{
                position: relative;
                float: left;
                top : 5%;
                margin : .5em;

                /*height: 8em;
                width: 7em;
                min-width: 80px;
                max-width: 115px;*/
                width: 16.5%;
                height: 70%;

                background: #fff;
                border-style: solid;
                border-width: 0.03em;
                -moz-border-radius: 0.125rem;; /* Firefox */
                -webkit-border-radius: 0.125rem;; /* Safari, Chrome */
                border-radius: 0.125rem;
                box-shadow:         0 1.825em 1.7125em 0 rgba(0, 0, 0, 0.50);
                -webkit-box-shadow: 0 1.825em 1.7125em 0 rgba(0, 0, 0, 0.50);
                -moz-box-shadow:    0 1.825em 1.7125em 0 rgba(0, 0, 0, 0.50);
                padding: 1em;
            }

            .title {
                display: inline-block;
                position: relative;
                padding-left: .2em;
                padding-right: .2em;
                color: var(--paper-indigo-500);
            }

            .title .big {
                /*font-size: 1.1em;*/
                widht: 100%;
                font-size: 0.9em;
                color: var(--google-grey-500);
            }

            .toolbar_button{
                /*height: 100%;
                display: inline-block;*/
                float: left;
                margin-top: 10%;
                width: 10px;
                --iron-icon-height: 28px;
                --iron-icon-width: 28px;
            }

            #pages{
                position: relative;
                float:left;
                display: inline-block;
                height: 25vh;
                width: 100%;
                overflow: hidden;
                text-align: center;
                /*margin-left: 3em;*/
            }

            img{
                height: 80%;
                width: 80%;
            }

        </style>

        <neon-animated-pages id="pages" class="flex" selected="[[selected]]" entry-animation="[[entryAnimation]]" exit-animation="[[exitAnimation]]">

           <template is="dom-repeat" items="{{itemsPages}}" as="page" index-as="p">

                <neon-animatable>

                   <paper-icon-button class="toolbar_button x-scope" on-click="_onPrevClick" icon="chevron-left" alt="arrow-back" title="arrow-back"></paper-icon-button>

                    <template is="dom-repeat" items="{{itemsPerPage}}" as="item" index-as="i">
                       <template is="dom-if" if="{{getName(p, i) != 0}}">
                             <div class='content-card' id="{{getName(p, i)}}" on-click="_cardClick">

                                <div>
                                    <div class="title">
                                        <div class="big">{{getName(p, i)}}</div>
                                    </div>
                                </div>
                                <br>
                                <div class="card-content-image">
                                    <img src="{{getImage(p, i)}}">
                                </div>
                            </div>
                       </template>
                    </template>

                    <paper-icon-button  class="toolbar_button x-scope" on-click="_onNextClick" icon="chevron-right" alt="arrow-forward" title="arrow-forward"></paper-icon-button>

                 </neon-animatable>
            </template>

        </neon-animated-pages>

    </template>

    <script>

        Polymer({

           is : 'items-slider-controllet',

            properties : {

                entryAnimation : {
                    type  : String,
                    value : ""
                },

                exitAnimation  : {
                    type  : String,
                    value : ""
                },

                selected : {
                    type  : Number,
                    value : 0
                },

                /**
                 * It stores all items to put in the slider
                 *
                 * @attribute tools
                 * @type array
                 * @default 'null'
                 */
                items : {
                    type: Array,
                    value: []
                },

                itemsPages : {
                   type : Array,
                   value : []
                },

                itemsPerPage : {
                    type : Array,
                    value : []
                },

                prevSelectedCard : {
                    type: Object,
                    value : null
                },

                numItemsPerPage : {
                    type: Number,
                    value : 4
                }

            },

            ready : function(){

                var pages = Math.floor(this.items.length / this.numItemsPerPage);
                var mod = this.items.length % this.numItemsPerPage;
                if(mod > 0) pages += 1;

                this.itemsPages   = new Array();
                this.itemsPerPage = new Array();

                for(var i = 0; i < pages; i++){
                    this.itemsPages.push(i);
                }

                for(var i = 0; i < this.numItemsPerPage; i++){
                    this.itemsPerPage.push(i);
                }

            },

            getPage : function(page){
               return this.itemsPages[page];
            },

            getName : function(page, item){
                return ( ((page * this.itemsPerPage.length) + item) > this.items.length - 1 ) ? 0 : this.items[(page * this.itemsPerPage.length) + item].name.replace("-datalet","");
            },

            getImage : function(page, item){
                return ( ((page * this.itemsPerPage.length) + item) > this.items.length - 1 ) ? 0 : this.items[(page * this.itemsPerPage.length) + item].image;
            },

            _onPrevClick : function() {
                this.entryAnimation = 'slide-from-left-animation';
                this.exitAnimation = 'slide-right-animation';
                this.selected = this.selected === 0 ? (this.itemsPages.length - 1) : (this.selected - 1);
            },

            _onNextClick : function() {
                this.entryAnimation = 'slide-from-right-animation';
                this.exitAnimation = 'slide-left-animation';
                this.selected = this.selected === (this.itemsPages.length - 1) ? 0 : (this.selected + 1);
            },

            _cardClick : function(e){
                if(this.prevSelectedCard != null){
                    this.prevSelectedCard.className = "content-card";

                }
                e.currentTarget.className = "content-selected";
                this.prevSelectedCard = e.currentTarget;

                this.fire('items-slider-controllet_item-selected', {datalet: e.currentTarget.id + "-datalet"});

            },

            attached : function(){
                /*this.selected = 1;*/
                this.$.pages.notifyResize();
            }
        });

    </script>

</dom-module>