<template>
  <div :class="['zoom-buttons shadow-xs', { move: showTimeSlider }]">
    <button
      class="zoom-button border-0 bg-white rounded-left ui-element"
      @click="zoomOut"
    >
      <font-awesome-icon icon="minus" />
    </button>
    <button
      class="zoom-button border-0 bg-white rounded-right ui-element border-right"
      @click="zoomIn"
    >
      <font-awesome-icon icon="plus" />
    </button>
  </div>
</template>

<style>
.zoom-buttons {
  position: absolute;
  z-index: 1;
  bottom: var(--small-offset);
  left: 50%;
  margin-left: -var(--icon-width);
  margin-bottom: 0;
  transition: margin-bottom 0.3s;
}
.zoom-buttons.move {
  bottom: calc(var(--large-offset) * 1.5);
}
.zoom-buttons .zoom-button {
  min-height: var(--icon-width);
  min-width: var(--icon-width);
  z-index: 1;
  outline: none;
  color: #666;
}
</style>

<script>
import { mapState } from "vuex";
/* This is Free Software under GNU Affero General Public License v >= 3.0
 * without warranty, see README.md and license for details.
 *
 * SPDX-License-Identifier: AGPL-3.0-or-later
 * License-Filename: LICENSES/AGPL-3.0.txt
 *
 * Copyright (C) 2018 by via donau
 *   – Österreichische Wasserstraßen-Gesellschaft mbH
 * Software engineering by Intevation GmbH
 *
 * Author(s):
 * Markus Kottländer <markus@intevation.de>
 * Thomas Junk <thomas.junk@intevation.de>
 */
export default {
  props: ["map"],
  computed: {
    ...mapState("application", ["showTimeSlider"]),
    zoomLevel: {
      get() {
        return this.map.getView().getZoom();
      },
      set(value) {
        this.map.getView().animate({ zoom: value, duration: 300 });
      }
    }
  },
  methods: {
    zoomIn() {
      this.zoomLevel = this.zoomLevel + 1;
    },
    zoomOut() {
      this.zoomLevel = this.zoomLevel - 1;
    }
  }
};
</script>