<template>
    <div>
        <div class="layoutJSON">
            Displayed as <code>[x, y, w, h]</code>:
            <div class="columns">
                <div class="layoutItem" v-for="item in layout" :key="item.i">
                    <b>{{item.i}}</b>: [{{item.x}}, {{item.y}}, {{item.w}}, {{item.h}}]
                </div>
            </div>
        </div>
        <button @click="addItem">Add an item dynamically</button>
        <input type="checkbox" v-model="draggable" /> Draggable
        <input type="checkbox" v-model="resizable" /> Resizable
        <grid-layout :layout.sync="layout"
                     :col-num="colNum"
                     :row-height="30"
                     :is-draggable="draggable"
                     :is-resizable="resizable"
                     :vertical-compact="true"
                     :use-css-transforms="true"
        >
            <grid-item v-for="item in layout"
                       :static="item.static"
                       :x="item.x"
                       :y="item.y"
                       :w="item.w"
                       :h="item.h"
                       :i="item.i"
                       :key="item.i"
            >
                <span class="text">{{item.i}}</span>
                <span class="remove" @click="removeItem(item.i)">x</span>
            </grid-item>
        </grid-layout>
    </div>
</template>

<script>
import { GridLayout, GridItem } from "vue-grid-layout"

export default {
    components: {
        GridLayout,
        GridItem
    },
    data() {
        return {
            layout: [
                { x: 0, y: 0, w: 2, h: 2, i: "0" },
                { x: 2, y: 0, w: 2, h: 2, i: "1" },
                { x: 4, y: 0, w: 2, h: 2, i: "2" },
                { x: 6, y: 0, w: 2, h: 2, i: "3" },
                { x: 8, y: 0, w: 2, h: 2, i: "4" },
            ],
            draggable: true,
            resizable: true,
            colNum: 12,
            index: 0,
        }
    },
    mounted() {
        // this.$gridlayout.load();
        this.index = this.layout.length;
    },
    methods: {
        addItem: function () {
            // Add a new item. It must have a unique key!
            this.layout.push({
                x: (this.layout.length * 2) % (this.colNum || 12),
                y: this.layout.length + (this.colNum || 12), // puts it at the bottom
                w: 2,
                h: 2,
                i: this.index,
            });
            // Increment the counter to ensure key is always unique.
            this.index++;
        },
        removeItem: function (val) {
            const index = this.layout.map(item => item.i).indexOf(val);
            this.layout.splice(index, 1);
        },
    }
}
</script>

<style>
.layoutJSON {
    background: #ddd;
    border: 1px solid black;
    margin-top: 10px;
    padding: 10px;
}

.columns {
    -moz-columns: 120px;
    -webkit-columns: 120px;
    columns: 120px;
}

/*************************************/

.remove {
    position: absolute;
    right: 2px;
    top: 0;
    cursor: pointer;
}

.vue-grid-layout {
    background: #eee;
}

.vue-grid-item:not(.vue-grid-placeholder) {
    background: #ccc;
    border: 1px solid black;
}

.vue-grid-item .resizing {
    opacity: 0.9;
}

.vue-grid-item .static {
    background: #cce;
}

.vue-grid-item .text {
    font-size: 24px;
    text-align: center;
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    margin: auto;
    height: 100%;
    width: 100%;
}

.vue-grid-item .no-drag {
    height: 100%;
    width: 100%;
}

.vue-grid-item .minMax {
    font-size: 12px;
}

.vue-grid-item .add {
    cursor: pointer;
}

.vue-draggable-handle {
    position: absolute;
    width: 20px;
    height: 20px;
    top: 0;
    left: 0;
    background: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='10' height='10'><circle cx='5' cy='5' r='5' fill='#999999'/></svg>") no-repeat;
    background-position: bottom right;
    padding: 0 8px 8px 0;
    background-repeat: no-repeat;
    background-origin: content-box;
    box-sizing: border-box;
    cursor: pointer;
}


</style>
